SII S-9365AAAABI6TIG2

Rev.1.1_00
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or
PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8365/8366 Series
The S-8365/8366 Series is a CMOS step-up switching regulator controller which
mainly consists of a reference voltage source, an oscillation circuit, an error
amplifier, a phase compensation circuit, a timer latch short-circuit protection
circuit, a PWM control circuit (S-8365 Series) and a PWM / PFM switching control
circuit (S-8366 Series).
With an external low-ON-resistance Nch Power MOS, this product is ideal for
applications requiring high efficiency and a high output current.
The S-8365 Series efficiently works on voltage’s condition of large I/O difference
due to the PWM control circuit linearly varies the duty ratio to 90%.
During light-load, the S-8366 Series switches its operation to the PFM control by
the PWM / PFM switching control circuit in order to prevent efficiency decline due
to the IC operating current.
Ceramic capacitors can be used for output capacitor. Small packages SNT-6A,
SOT-23-5 and SOT-23-6 enable high-density mounting.
Features
• Low operation voltage
• Input voltage range
• Oscillation frequency
• Reference voltage
• Soft start function
• Low current consumption
• Duty ratio
• Shutdown function
• External parts
• Timer latch short-circuit protection circuit
• UVLO (under-voltage lockout) function
• Small packages
• Lead-free product
: Start at 1.1 V (1 mA) guaranteed (in the product without UVLO function)
: 1.8 V to 5.5 V
: 1.2 MHz, 600 kHz
: 0.6 V±2.0%
: 7 ms typ.
: 70 µA typ. at switching off
: Built-in PWM / PFM switching control circuit (S-8366 Series)
28% to 85% (1.2 MHz product)
28% to 90% (600 kHz product)
: Current consumption 1.0 µA max. at shutdown
: Inductor, diode, capacitor, transistor
: Selectable with / without short-circuit protection circuit for each product
Settable delay time by external capacitor
(in the product with short-circuit protection)
: Selectable with / without UVLO for each product
: SNT-6A, SOT-23-5, SOT-23-6
Applications
• MP3 players, digital audio players
• Digital cameras, GPS, wireless transceiver
• Portable devices
Packages
Package name
Drawing code
Package
Tape
Reel
Land
SNT-6A
PG006-A
PG006-A
PG006-A
PG006-A
SOT-23-5
MP005-A
MP005-A
MP005-A
−
SOT-23-6
MP006-A
MP006-A
MP006-A
−
Seiko Instruments Inc.
1
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
Block Diagram
1. With UVLO function and short-circuit protection
L
VDD
M1
EXT
VIN
VOUT
SD
CIN
ON/OFF
Triangular Wave
Oscillation Circuit
PWM Comparator
Error
PWM control, or
Amplifier
PWM / PFM
+
+
Switching Control
−
Circuit
−
Timer Latch
Short-Circuit
Protection
Reference Voltage
ON/OFF
with Soft-Start Circuit
Circuit
UVLO
CSP
CFB
RFB1
FB
RFB2
COUT
VSS
Figure 1
2. With UVLO function, without short-circuit protection
L
SD
VOUT
Triangular Wave
Oscillation Circuit
UVLO
VDD
PWM Comparator
M1
PWM control, or
PWM / PFM
Switching Control
Circuit
EXT
VIN
CIN
ON/OFF
+
−
Error
Amplifier
+
−
VSS
Figure 2
2
Seiko Instruments Inc.
RFB1
FB
Reference Voltage
with Soft-Start Circuit
ON/OFF
Circuit
CFB
RFB2
COUT
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
3. Without UVLO and short-circuit protection
L
SD
VOUT
IC Internal
Power Supply
Triangular Wave
Oscillation Circuit
PWM Comparator
M1
PWM control, or
PWM / PFM
Switching Control
Circuit
EXT
VIN
CIN
ON/OFF
+
−
Error
Amplifier
+
−
CFB
RFB1
FB
Reference Voltage
with Soft-Start Circuit
ON/OFF
Circuit
VDD
RFB2
COUT
VSS
Figure 3
Caution
To stabilize the output voltage and oscillation frequency of the S-8365/8366 Series, the input voltage of
1.8 V ≤ VDD ≤ 5.5 V is necessary. When connecting the VOUT output to the VDD pin, set the input voltage
(VOUT) as to satisfy the above range, including the spike voltage generated in VOUT.
Seiko Instruments Inc.
3
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
Product Name Structure
Users can select the control system, oscillation frequency, short-circuit protection, UVLO function, packages for the
S-8365/8366 Series. Refer to “1. Product Name” regarding the contents of product name, “2. Product List” regarding
the product type.
1. Product name
(1) SNT-6A
S-836
x
A
x
x
x
x
-
I6T1
G2
Package name (abbreviation) and IC packing
specification*1
I6T1: SNT-6A, Tape
ON / OFF pin pull-down
A: Unavailable
B: Available
UVLO function
A: Unavailable
B: Available
Short-circuit protection
A: Unavailable
B: Available
Oscillation frequency
A: 1.2 MHz
B: 600 kHz
Control system
5: PWM control
6: PWM / PFM switching control
*1. Refer to the tape specification.
4
Seiko Instruments Inc.
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
(2) SOT-23-5, SOT-23-6
S-836
x
A
x
x
x
x
-
xxxx
S2
Package name (abbreviation) and IC packing
specification*1
M5T1: SOT-23-5, Tape
M6T1: SOT-23-6, Tape
ON / OFF pin pull-down
A: Unavailable
B: Available
UVLO function
A: Unavailable
B: Available
Short-circuit protection
A: Unavailable (SOT-23-5)
B: Available (SOT-23-6)
Oscillation frequency
A: 1.2 MHz
B: 600 kHz
Control system
5: PWM control
6: PWM / PFM switching control
*1. Refer to the tape specification.
Seiko Instruments Inc.
5
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
2. Product list
(1) S-8365 Series (PWM control)
Table 1
SOT-23-5
−
SOT-23-6
SNT-6A
S-8365AABBA-M6T1S2 S-8365AABBA-I6T1G2
Oscillation Short-circuit
frequency protection
UVLO
function
ON / OFF
pin
pull-down
1.2 MHz
Available
Available
Unavailable
Available
Unavailable
S-8365AAABA-M5T1S2
−
S-8365AAABA-I6T1G2
1.2 MHz
Unavailable
S-8365AAAAA-M5T1S2
−
S-8365AAAAA-I6T1G2
1.2 MHz
Unavailable Unavailable Unavailable
S-8365ABBBA-M6T1S2 S-8365ABBBA-I6T1G2
600 kHz
Available
Available
Unavailable
600 kHz
Unavailable
Available
Unavailable
−
S-8365ABABA-M5T1S2
−
S-8365ABABA-I6T1G2
S-8365ABAAA-M5T1S2
−
S-8365ABAAA-I6T1G2 600 kHz Unavailable Unavailable Unavailable
Remark 1. Contact our sales office for S-8365AxBAA (without UVLO function, with short-circuit protection).
2. Contact our sales office for S-8365AxxxB ( ON/OFF pin pull-down).
(2) S-8366 Series (PWM / PFM switching control)
Table 2
SOT-23-5
SOT-23-6
SNT-6A
−
S-8366AABBA-M6T1S2 S-8366AABBA-I6T1G2
−
S-8366AAABA-I6T1G2
S-8366AAABA-M5T1S2
−
S-8366AAAAA-I6T1G2
S-8366AAAAA-M5T1S2
−
S-8366ABABA-M5T1S2
S-8366ABBBA-M6T1S2 S-8366ABBBA-I6T1G2
−
S-8366ABABA-I6T1G2
−
S-8366ABAAA-I6T1G2
Oscillation Short-circuit
frequency protection
UVLO
function
1.2 MHz
Available
Available
ON / OFF
pin
pull-down
Unavailable
1.2 MHz
Unavailable
Available
Unavailable
1.2 MHz
Unavailable Unavailable Unavailable
600 kHz
Available
Available
Unavailable
600 kHz
Unavailable
Available
Unavailable
600 kHz Unavailable Unavailable Unavailable
S-8366ABAAA-M5T1S2
Remark 1. Contact our sales office for S-8366AxBAA (without UVLO function, with short-circuit protection).
2. Contact our sales office for S-8366AxxxB ( ON/OFF pin pull-down).
6
Seiko Instruments Inc.
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
Pin Configurations
Table 3
SNT-6A
Top view
1
6
2
5
3
4
Figure 4
With Short-Circuit Protection
Pin No.
Symbol
1
2
EXT
VSS
3
ON / OFF
4
FB
5
CSP
6
VDD
Table 4
Description
External transistor connection pin
GND pin
Power-off pin
“H” : Power-on (normal operation)
“L” : Power-off (standby)
Output voltage feedback pin
Delay time setting pin for short-circuit
protection
IC power supply pin
Without Short-Circuit Protection
Pin No.
Symbol
1
2
EXT
VSS
Description
External transistor connection pin
GND pin
Power-off pin
“H” : Power-on (normal operation)
3
ON / OFF
“L” : Power-off (standby)
4
FB
Output voltage feedback pin
*1
NC
5
No connection
6
VDD
IC power supply pin
*1. The NC pin indicates electrically open.
The NC pin can be connected to VDD or VSS.
Table 5
SOT-23-5
Top view
5
1
4
2
Pin No.
Without Short-Circuit Protection
Symbol
1
ON / OFF
2
3
4
5
VSS
EXT
VDD
FB
Description
Power-off pin
“H” : Power-on (normal operation)
“L” : Power-off (standby)
GND pin
External transistor connection pin
IC power supply pin
Output voltage feedback pin
3
Figure 5
Seiko Instruments Inc.
7
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
SOT-23-6
6
1
Table 6
With Short-Circuit Protection
Top view
Pin No.
1
Symbol
VDD
5
2
CSP
3
FB
4
ON / OFF
5
6
VSS
EXT
2
4
3
Figure 6
8
Seiko Instruments Inc.
Description
IC power supply pin
Delay time setting pin for
short-circuit protection
Output voltage feedback pin
Power-off pin
“H” : Power-on (normal operation)
“L” : Power-off (standby)
GND pin
External transistor connection pin
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
Absolute Maximum Ratings
Table 7
Absolute Maximum Ratings
(Ta = 25°C, VSS = 0 V unless otherwise specified)
Symbol
Absolute Maximum Ratings
Unit
VDD
VSS−0.3 to VSS+6.0
V
VFB
VSS−0.3 to VDD+0.3
V
VEXT
VSS−0.3 to VDD+0.3
V
VON / OFF
VSS−0.3 to VDD+0.3
V
VCSP
VSS−0.3 to VDD+0.3
V
400*1
mW
PD
600*1
mW
650*1
mW
Topr
−40 to +85
°C
Tstg
−40 to +125
°C
Item
VDD pin voltage
FB pin voltage
EXT pin voltage
ON/OFF pin voltage
CSP pin voltage
SNT-6A
SOT-23-5
SOT-23-6
Operating ambient temperature
Storage temperature
*1. When mounted on board
[Mounted board]
(1) Board size :
114.3 mm × 76.2 mm × t1.6 mm
(2) Name :
JEDEC STANDARD51-7
Power dissipation
The absolute maximum ratings are rated values exceeding which the product could suffer physical
damage. These values must therefore not be exceeded under any conditions.
700
Power Dissipation (PD) [mW]
Caution
SOT-23-5
600
SOT-23-6
500
400
300
200
SNT-6A
100
0
0
50
100
150
Ambient Temperature (Ta) [°C]
Figure 7
Package Power Dissipation (When Mounted on Board)
Seiko Instruments Inc.
9
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
Electrical Characteristics
1.
1.2 MHz product
Table 8
Item
Input voltage*1
Operating start
*2
voltage
Oscillation start
voltage
Operation holding
voltage
FB voltage
FB voltage temperature
coefficient
FB pin input current
Current consumption
*3
at operation
Current consumption
at switching off
Current consumption
at shutdown
EXT pin output current
Oscillation frequency
Maximum duty ratio
PWM / PFM switching
*4
Duty ratio
Short-circuit protection
*5
delay time
UVLO release voltage
UVLO hysteresis width
High level input voltage
Low level input voltage
Symbol
VDD
VST1
VST2
VHLD
VFB
∆VFB
∆Ta
IFB
ISS1
Electrical Characteristics
(VDD = 3.3 V, Ta = 25°C unless otherwise specified)
Test
Conditions
Min.
Typ.
Max.
Unit
Circuit
−
1.8
Product without UVLO function,
−
IOUT = 1 mA
No external parts
−
for product without UVLO function,
Product without UVLO function,
IOUT = 1 mA, Determined by decreasing 0.8
VDD gradually
−
0.588
Ta = −40°C to +85°C
VDD = 1.8 V to 5.5 V, FB pin
At switching operation, no load
VFB = VFB(S) × 0.95
−
5.5
V
2
−
1.1
V
3
−
1.0
V
1
−
−
V
3
0.6
0.612
V
1
−
±100
−
ppm/°C
1
－0.1

0.1
µA
1
−
500
−
µA
1
ISS2
At switching stop, VFB = VFB(S) × 1.5
−
70
120
µA
1
ISSS
VON / OFF = 0 V
−
−
1.0
µA
1
IEXTH
IEXTL
fosc
Max
Duty
PFM
Duty
VEXT = VDD − 0.4 V
VEXT = 0.4 V
−
100
1.0
−130
200
1.2
−60
−
1.4
mA
mA
MHz
1
1
1
VFB = VFB(S) × 0.95
80
85
90
%
1
VDD = VOUT(S) − 0.1 V, no load
20
28
36
%
2
37.5
50
75
ms
1
1.60
0.05
0.75
−
1.70
0.10
−
−
1.78
0.15
−
0.3
V
V
V
V
1
1
1
1
−0.1
−
0.1
µA
1
0.2
1.0
2.5
µA
1
tPRO
VUVLO+
VUVLOHYS
VSH
VSL
High level input current ISH
−
Product with short-circuit protection,
At CSP = 0.1 µF
Product with UVLO function
Product with UVLO function
VDD = 1.8 V to 5.5 V, ON/OFF pin
VDD = 1.8 V to 5.5 V, ON/OFF pin
Product without ON/OFF pin pull-down,
VDD = 1.8 V to 5.5 V, ON/OFF pin
Product with ON/OFF pin pull-down,
VDD = 1.8 V to 5.5 V, ON/OFF pin
VDD = 1.8 V to 5.5 V, ON/OFF pin
Low level input current ISL
−0.1
−
0.1
µA
1
Soft-start time
tSS
−
5
7
10
ms
2
*1. The S-8365/8366 Series steps up from VDD = 1.1 V, but set the input voltage as to 1.8 V ≤ VDD ≤ 5.5 V for stabilizing
the output voltage and oscillation frequency.
*2. This is the guaranteed value measured with external parts shown in “Table 10 External Parts List” and with test
circuits shown in Figure 10. The operating start voltage varies largely depending on diode’s forward voltage.
Evaluate sufficiently with actual device.
*3. VFB(S) is a setting value for FB voltage.
*4. VOUT(S) is a setting value for output voltage. VOUT is the typical value of actual output voltage.
VOUT(S) can be set by using the rate of VFB and the output voltage setting resistors (RFB1, RFB2).
*5. The short-circuit protection time can be set by the external capacitor, and the maximum set value by the external
capacitor is unlimited when an ideal case is assumed. But use CSP = approximately 0.47 µF as a target maximum
value due to the need to consider the discharge time of the capacitor.
10
Seiko Instruments Inc.
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
2.
S-8365/8366 Series
600 kHz product
Table 9
Item
*1
Input voltage
Operating start
*2
voltage
Oscillation start
voltage
Operation holding
voltage
FB voltage
FB voltage temperature
coefficient
FB pin input current
Current consumption
*3
at operation
Current consumption
at switching off
Current consumption
at shutdown
EXT pin output current
Oscillation frequency
Maximum duty ratio
PWM / PFM switching
*4
Duty ratio
Short-circuit protection
*5
delay time
UVLO release voltage
UVLO hysteresis width
High level input voltage
Low level input voltage
Symbol
VDD
VST1
VST2
VHLD
VFB
∆VFB
∆Ta
IFB
ISS1
Electrical Characteristics
(VDD = 3.3 V, Ta = 25°C unless otherwise specified)
Test
Conditions
Min.
Typ.
Max.
Unit
Circuit
−
1.8
Product without UVLO function,
−
IOUT = 1 mA
No external parts
−
for product without UVLO function,
Product without UVLO function,
IOUT = 1 mA, Determined by decreasing 0.8
VDD gradually

0.588
Ta = −40°C to +85°C
VDD = 1.8 V to 5.5 V, FB pin
At switching operation, no load
VFB = VFB(S) × 0.95
−
5.5
V
2
−
1.0
V
3
−
0.9
V
1
−
−
V
3
0.6
0.612
V
1
−
±100
−
ppm/°C
1
−0.1
−
0.1
µA
1
−
300
−
µA
1
ISS2
At switching stop, VFB = VFB(S) × 1.5
−
70
120
µA
1
ISSS
VON / OFF = 0 V
−
−
1.0
µA
1
IEXTH
IEXTL
fosc
Max
Duty
PFM
Duty
VEXT = VDD − 0.4 V
VEXT = 0.4 V
−
100
510
−130
200
600
−60
−
690
mA
mA
kHz
1
1
1
VFB = VFB(S) × 0.95
85
90
95
%
1
VDD = VOUT(S) − 0.1 V, no load
20
28
36
%
2
37.5
50
75
ms
1
1.60
0.05
0.75
−
1.70
0.10
−
−
1.78
0.15
−
0.3
V
V
V
V
1
1
1
1
−0.1
−
0.1
µA
1
0.2
1.0
2.5
µA
1
tPRO
VUVLO+
VUVLOHYS
VSH
VSL
High level input current ISH
−
Product with short-circuit protection,
At CSP = 0.1 µF
Product with UVLO function
Product with UVLO function
VDD = 1.8 V to 5.5 V, ON/OFF pin
VDD = 1.8 V to 5.5 V, ON/OFF pin
Product without ON/OFF pin pull-down,
VDD = 1.8 V to 5.5 V, ON/OFF pin
Product with ON/OFF pin pull-down,
VDD = 1.8 V to 5.5 V, ON/OFF pin
VDD = 1.8 V to 5.5 V, ON/OFF pin
Low level input current ISL
−0.1
−
0.1
µA
1
Soft-start time
tSS
−
5
7
10
ms
2
*1. The S-8365/8366 Series steps up from VDD = 1.0 V, but set the input voltage as to 1.8 V ≤ VDD ≤ 5.5 V for stabilizing
the output voltage and oscillation frequency.
*2. This is the guaranteed value measured with external parts shown in “Table 10 External Parts List” and with test
circuits shown in Figure 10. The operating start voltage varies largely depending on diode’s forward voltage.
Evaluate sufficiently with actual device.
*3. VFB(S) is a setting value for FB voltage.
*4. VOUT(S) is a setting value for output voltage. VOUT is the typical value of actual output voltage.
VOUT(S) can be set by using the rate of VFB and the output voltage setting resistors (RFB1, RFB2).
*5. The short-circuit protection time can be set by the external capacitor, and the maximum set value by the external
capacitor is unlimited when an ideal case is assumed. But use CSP = approximately 0.47 µF as a target maximum
value due to the need to consider the discharge time of the capacitor.
Seiko Instruments Inc.
11
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
External Parts List When Measuring Electrical Characteristics
Table 10
Element Name
External Parts List
Inductor
L
Transistor
M1
Q1
Consonants
2.2 µH (1.2 MHz product)
3.3 µH (600 kHz product)
−
−
Diode
SD
−
Input capacitor
Output capacitor
CIN
COUT
10 µF
22 µF
FB pin capacitor
CFB
47 pF
CSP pin capacitor
Speed-up capacitor
Base resistor
Output voltage setting
resistor 1
Output voltage setting
resistor 2
CSP
Cb
Rb
0.1 µF
2200 pF
1 kΩ
RFB1
220 kΩ
ROHM Co., Ltd.
MCR03 series
RFB2
30 kΩ
ROHM Co., Ltd.
MCR03 series
12
Symbol
Manufacturer
TAIYO YUDEN Co., Ltd.
TDK Corporation
Vishay Intertechnology, Inc.
TOSHIBA CORPORATION
SHINDENGEN ELECTRIC
MANUFACTURING CO.,LTD
TDK Corporation
TDK Corporation
Part Number
NR6028T
LTF5022
Si3460BDV
2SD2652
D1FH3
C3225X7R1E106MB
C4532X7R1E226MB
GRM1882C1H
Murata Manufacturing Co., Ltd.
series
TDK Corporation
C1220X7R1E104MB
TDK Corporation
C1005X7R1H222K
ROHM Co., Ltd.
MCR03 series
Seiko Instruments Inc.
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
Test Circuits
1.
A
VDD
EXT
FB
CIN
ON/OFF
A
S-8365/8366
Series
CSP
VSS
A
CSP
↓
V
Figure 8
2.
L
SD
M1
VDD
RFB1
EXT
CIN
ON/OFF
A
S-8365/8366
Series
VSS
VOUT
CFB
COUT
FB
CSP
V
↓
IOUT
RFB2
CSP
Figure 9
3.
L
SD
Cb
VDD
Q1
RFB1
EXT
CIN
ON/OFF
A
S-8365/8366
Series
VOUT
CFB
Rb
COUT
FB
V
↓
IOUT
RFB2
VSS
Figure 10
Seiko Instruments Inc.
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STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
Operation
1. Switching control method
1.1
PWM control (S-8365 Series)
The S-8365 Series is a switching regulator controller that uses a pulse width modulation method (PWM).
In conventional PWM control switching regulators, pulses are skipped when the output load current is small,
causing a fluctuation in the ripple frequency of the output voltage, resulting in increased ripple voltage.
For the S-8365 Series, although the pulse width changes from 0% to 90% in accordance with each load current
(or 0% to 85% for 1.2 MHz products), since the switching frequency does not change, the ripple voltage
generated due to switching can be eliminated by filtering. The ripple voltage can thus be lowered in the wide
input voltage and load current ranges.
1.2
PWM / PFM switching control (S-8366 Series)
The S-8366 Series switching regulator controller automatically switches between the pulse width modulation
method (PWM) and pulse frequency modulation method (PFM) according to the load current.
A low ripple power can be supplied by operating on PWM control for which the pulse width changes from 28% to
90% (or 28% to 85% for 1.2 MHz products) in the range where the output load current is large.
The S-8366 Series operates on PFM control when the output load current is small and the fixed pulses which
have the width of 28% are skipped according to the load current amount. Therefore, the oscillation circuit
intermittently oscillates, reducing the self-current consumption. This avoids decreased efficiency when the
output load current is small. The point at which PWM control switches to PFM control varies depending on the
external element (inductor, diode, etc.), input voltage value, and output voltage value, and this method achieves
high efficiency in the output load current of about 100 µA.
2. Soft-start function
The S-8365/8366 Series has a soft-start circuit. The output voltage (VOUT) gradually rises after power-on or startup
when the ON/OFF pin is set to high, suppressing rush current and overshooting the output voltage. The soft-start
time (tSS) for the S-8365/8366 Series is defined as the time from startup until VOUT reaches 90% of the output set
voltage value (VOUT(S)). A reference voltage adjustment method is used as the soft-start method and the reference
voltage gradually rises from 0 V after soft-start.
A soft-start performs by controlling the FB pin voltage so that it follows the rise of the reference voltage. After the
reference voltage rises once, it is reset to 0 if the ON/OFF pin voltage drops to low, the power supply voltage drops
to the UVLO detection voltage, or the S-8365/8366 Series enters the short-circuit protection latch status. A
soft-start is performed regardless of conditions when resuming step-up operation.
14
Seiko Instruments Inc.
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
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S-8365/8366 Series
3. Shutdown pin
This pin stops or starts step-up operations.
3.1
Without ON/OFF pin pull-down
When this pin is set to the low level, the voltage of the EXT pin is fixed to 0 V, and the external transistor and all
internal circuits stop, substantially reducing the current consumption.
Do not use the ON/OFF pin in a floating state because it is set up as shown in Figure 11 and is not internally
pulled up or down. Do not apply a voltage of between 0.3 V and 0.75 V to the ON/OFF pin because applying
such a voltage increases the current consumption. If the ON/OFF pin is not used, connect it to the VDD pin.
Table 11
CR Oscillation
Output Voltage
Circuit
“H”
Operates
Set value
≅VIN*1
“L”
Stops
Voltage obtained by subtracting the voltage drop due to the DC resistance of the inductor and the diode
forward voltage from VIN.
ON/OFF pin
*1.
VDD
ON/OFF
VSS
Figure 11
3.2
With ON/OFF pin pull-down
When the ON/OFF pin is set to the low level, the voltage of the EXT pin is fixed to 0 V, and the external
transistor and all internal circuits stop substantially reducing the current consumption.
The ON/OFF pin is set up as shown in Figure 12 and is internally pulled down by using the depression
transistor, so all circuits stop even if this pin is floating. Do not apply a voltage of between 0.3 V and 0.75 V to
the ON/OFF pin because applying such a voltage increases the current consumption. If the ON/OFF pin is not
used, connect it to the VDD pin.
Table 12
ON/OFF Pin
*1.
CR Oscillation
Circuit
Output Voltage
“H”
Operates
Set value
≅VIN*1
“L”
Stops
≅VIN*1
High-Z
Stops
Voltage obtained by subtracting the voltage drop due to the DC resistance of the inductor and the diode
forward voltage from VIN.
VDD
ON/OFF
VSS
Figure 12
Seiko Instruments Inc.
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STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
4. Timer latch type short-circuit protection (products with short-circuit protection function)
The S-8365/8366 Series incorporates a timer latch type short-circuit protection circuit that stops switching operation
if the output short circuits for a certain time or more. Connect a capacitor (CSP) to the CSP pin to set the delay time
of this circuit.
The S-8365/8366 Series operates on the maximum duty if the output voltage drops due to output short-circuiting or
other factors. When it enters the maximum duty status, charging the constant current to CSP is started. If this
status is held for the short-circuit protection delay time or more, the voltage of the CSP pin exceeds the reference
voltage and the IC enters the latch mode.
Note that switching operation stops in latch mode but the internal circuits normally operate, which differs from the
power-off status. The constant current is continuously charged to CSP even in latch mode, so the voltage of the
CSP pin rises to the VDD level.
To reset the latch mode of short-circuit protection, lower VDD to the UVLO detection voltage or lower or set the ON/
OFF pin to the low level.
Input voltage
(VDD)
UVLO release
UVLO detection
Short-circuit state
Output load
CSP pin
voltage
(VCSP)
Reference
voltage
50 ms (CSP = 0.1 µF)
Latch mode
Normal
state
Short circuit protection
delay time
Latch
period
Short-circuit protection Short-circuit protection
delay time
delay time
Reset period
Reset period
Figure 13
5. UVLO function (products with UVLO function)
The S-8365/8366 Series has a UVLO (undervoltage lockout) circuit for avoiding IC malfunctions due to power
supply voltage drops. The S-8365/8366 Series stops switching operation upon UVLO detection and retains the
external transistor in the off state. After entering the UVLO detection status once, the soft-start function is reset.
Note, however, that the other internal circuits operate normally and that the status differs from the power-off status.
16
Seiko Instruments Inc.
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
Operation Principles
The S-8365/8366 Series is a step-up switching regulator controller. Figure 14 shows the basic circuit diagram.
Step-up switching regulators start current supply by the input voltage (VIN) when the Nch power MOS FET is turned
on and holds energy in the inductor at the same time. When the Nch power MOS FET is turned off, the CONT pin
voltage is stepped up to discharge the energy held in the inductor and the current is discharged to VOUT through the
diode. When the discharged current is stored in CL, a voltage is generated, and the potential of VOUT increases until
the voltage of the FB pin reaches the same potential as the internal reference voltage.
For the PWM control method, the switching frequency (fOSC) is fixed and the VOUT voltage is held constant
according to the ratio of the ON time and OFF time (ON duty) of the Nch power MOS FET in each period.
For the PWM control method, the VOUT voltage is held constant by controlling the ON time.
In the S-8366 Series, the Nch power MOS FET is turned on when the fixed duty cycle is 28% for the PFM control
method. When energy is discharged to VOUT once and the VOUT potential exceeds the set value, the Nch power
MOS FET stays in the off status until VOUT decreases to the set value or less due to the load discharge. Time VOUT
decreases to the set value or less depends on the amount of load current, so, the switching frequency varies
depending on this current.
CONT
L
IOUT
I2
SD
VOUT
VIN
I1
Nch power
MOS FET
EXT
FB
COUT
VSS
Figure 14
RL
Basic Circuit of Step-up Switching Regulator
The ON duty in the current continuous mode can be calculated by using the equation below. Use the S-8365/8366
Series in the range where the ON duty is less than the maximum duty. Note that the products with short-circuit
protection is set in the timer-latch status if the maximum duty lasts the short-circuit protection delay time (tPRO) or
more.
The maximum duty is 85% typ. for 1.2 MHz products and 90% for 600 kHz products.
ON duty =
1 −

VIN
VOUT + VD*1


× 100 [%]
The ON time (tON) can be calculated by using the following equation :
1
× ON duty
tON =
f OSC
VIN
1
 ·········· (1)
=
× 1 −
V
+ VD*1 

OUT
f OSC
*1. VD : Forward voltage of diode
Seiko Instruments Inc.
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STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
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S-8365/8366 Series
1. Continuous current mode
The following explains the current that flows into the inductor when the step-up operation stabilizes in a certain
status and IOUT is sufficiently large.
When the Nch power MOS FET is turned on, current (I1) flows in the direction shown in Figure 14. The inductor
current (IL) at this time gradually increases in proportion with the ON time (tON) of the Nch power MOS FET.
Current change of inductor within tON :
∆IL(ON) = IL max. − IL min.
VIN
= L × tON
When the Nch power MOS FET is turned off, the voltage of the CONT pin is stepped up to VOUT + VD and the
voltage on both ends of the inductor becomes VOUT + VD − VIN. However, it is assumed here that VOUT >> VD and VD
is ignored.
Current change of inductor within tOFF :
VOUT − VIN
∆IL(OFF) =
× tOFF
L
The input power equals the output power in an ideal situation where there is no loss by components.
IIN(AV) :
PIN = POUT
IIN(AV) × VIN = IOUT × VOUT
VOUT
× IOUT .................. (2)
∴IIN(AV) = V
IN
The current that flows in the inductor consists of a ripple current that changes due to variation over time and a
direct current.
From Figure 15 :
IIN(AV) :
∆IL
2
VOUT − VIN
= IIN(DC) +
× tOFF
2×L
VIN
= IIN(DC) +
× tON.......... (3)
2×L
IIN(AV) = IIN(DC) +
Above, the continuous mode is the operation mode when IIN(DC) > 0 as shown in Figure 15 and the inductor current
continuously flows.
While the output current (IOUT) continues to decrease, IIN(DC) reaches 0 as shown in Figure 16. This point is the
critical point of the continuous mode.
As shown in equations (2) and (3), the direct current component (IIN(DC)) depends on IOUT.
IOUT(0) when IIN(DC) reaches 0 (critical point) :
IOUT(0) =
tON × VIN2
2 × L × VOUT
tON can be calculated using equation (1).
When the output current decreases below IOUT(0), the current flowing in the inductor stops flowing in the tOFF period
as shown in Figure 17. This is the discontinuous mode.
18
Seiko Instruments Inc.
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
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IL
IL max.
IIN(AV)
IL min.
IIN(DC)
t
tON
tOFF
t = 1 / fOSC
Figure 15
Continuous Mode (Current Cycle of Inductor Current IL)
IL
IL max.
IL min.
t
tON
tOFF
t = 1 / fOSC
Figure 16
Critical Point (Current Cycle of Inductor Current IL)
IL
IL max.
IL min.
t
tON
tOFF
t = 1 / fOSC
Figure 17
Discontinuous Mode (Current Cycle of Inductor Current IL)
Seiko Instruments Inc.
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STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
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S-8365/8366 Series
External Parts Selection
1. Inductor
The recommended L value of the S-8365/8366 Series is 2.2 µH for 1.2 MHz products and 3.3 µH for 600 kHz
products.
Note the following when changing the inductance.
The inductance (L) has a strong influence on the maximum output current (IOUT) and efficiency (η).
The inductor peak current (IPK) increases when L is decreased, which improves the circuit stability and increases
the IOUT users can obtain. If L is decreased further, the ability of the external transistor to drive the current becomes
insufficient, reducing the efficiency and decreasing IOUT.
The loss due to the IPK of the switching transistor is decreased by increasing L and the efficiency maximizes at a
certain L value. If L is increased further, the loss due to the serial resistance of the inductor increases, lowering the
efficiency.
Caution When selecting an inductor, be careful about its allowable current. If a current exceeding the
allowable current flows through the inductor, magnetic saturation occurs, substantially lowering
the efficiency and destroying ICs due to large current. Therefore, select an inductor such that IPK
does not exceed the allowable current. The following equations express IPK in the ideal statuses
in the discontinuous and continuous modes :
2 × IOUT × (VOUT + VD*2 − VIN)
fOSC*1 × L
*2
VOUT + VD
(VOUT + VD*2 − VIN) × VIN
×
I
IPK =
OUT +
VIN
2 × (VOUT + VD*2) × fOSC*1 × L
IPK =
*1.
*2.
(Continuous mode)
fOSC : oscillation frequency
VD is the forward voltage of a diode. The reference value is 0.4 V.
However, current exceeding the above equation flows because conditions are practically not ideal.
Perform sufficient evaluation with actual application.
Table 13
Manufacture
TDK Corporation
Coilcraft, Inc.
Taiyo Yuden Co., Ltd.
Sumida Corporation
Manufacture
TDK Corporation
Coilcraft, Inc.
Taiyo Yuden Co., Ltd.
Typical Inductors (for Small Low-Profile Devices)
Product Name
L Value
DC Resistance
Rated
Current
Dimensions (L × W × H)
[mm]
VLF3010ST-2R2M
VLF3010ST-3R3M
VLS252010-2R2M
VLS252010-3R3M
LPS3008-222ML
LPS3008-332ML
NR3010T2R2M
NR3010T3R3M
CDRH2D11BNP-2R2N
CDRH2D11BNP-3R3N
2.2 µH
3.3 µH
2.2 µH
3.3 µH
2.2 µH
3.3 µH
2.2 µH
3.3 µH
2.2 µH
3.3 µH
0.092 Ω max.
0.130 Ω max.
0.190 Ω max.
0.304 Ω max.
0.175 Ω max.
0.285 Ω max.
0.114 Ω max.
0.168 Ω max.
0.0955 Ω max.
0.154 Ω max.
1.1 A max.
0.88 A max.
1.2 A max.
1.0 A max.
1.1 A max.
0.88 A max.
1.1 A max.
0.87 A max.
1.4 A max.
1.0 A max.
2.8 × 3.0 × 1.0
2.8 × 3.0 × 1.0
2.5 × 2.0 × 1.0
2.5 × 2.0 × 1.0
3.0 × 3.0 × 0.8
3.0 × 3.0 × 0.8
3.0 × 3.0 × 1.0
3.0 × 3.0 × 1.0
3.0 × 3.0 × 1.2
3.0 × 3.0 × 1.2
Table 14
20
(Discontinuous mode)
Typical Inductors (for Large Current, High Step-up Rate)
Product Name
LTF5022T-2R2M
LTF5022T-3R3M
LPS6225-222ML
LPS6225-332ML
NR6028T2R2M
L Value
DC Resistance
2.2 µH
3.3 µH
2.2 µH
3.3 µH
2.2 µH
0.040 Ω max.
0.060 Ω max.
0.045 Ω max.
0.055 Ω max.
0.020 Ω max.
Seiko Instruments Inc.
Rated
Current
3.4 A max.
2.7 A max.
4.1 A max.
3.6 A max.
4.2 A max.
Dimensions (L × W × H)
[mm]
5.0 × 5.2 × 2.2
5.0 × 5.2 × 2.2
6.0 × 6.0 × 2.4
6.0 × 6.0 × 2.4
6.0 × 6.0 × 2.8
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
2. Diode
Use an externally mounted that meets the following conditions.
• Low forward voltage (Schottky barrier diode or similar type)
• High switching speed
• Reverse withstand voltage of VOUT + spike voltage or more
• Rated current of IPK or more
3. Input capacitor (CIN) and output capacitor (COUT)
To improve efficiency, an input capacitor (CIN) lowers the power supply impedance and averages the input current.
Select CIN according to the impedance of the power supply used. The recommended capacitance is 10 µF for the
S-8365/8366 Series.
An output capacitor (COUT), which is used to smooth the output voltage, requires a capacitance larger than that of
the step-down type because the current is intermittently supplied from the input to the output side in the step-up
type. A 22 µF ceramic capacitor is recommended for the S-8365/8366 Series. However, a higher capacitance is
recommended if the output voltage is high or the load current is large. If the output voltage or load current is low,
about 10 µF can be used without problems.
Select COUT after sufficient evaluation with actual application.
A ceramic capacitor can be used for both the input and output.
4. Capacitor for setting short-circuit protection delay time (CSP) (products with short-circuit
protection)
For the S-8365/8366 Series, the short-circuit protection delay time can be set to any value by using an external
capacitor. Connect the capacitor between the CSP and VSS pins. Select the capacitor value according to the
equation below and Figure 18.
Note, however, that the equation and figure show a theoretical value assuming an ideal capacitor value and typ. IC
conditions. Variations of the capacitor and IC are not considered.
For the IC variations, see the short-circuit protection delay time (tPRO) in “ Electrical Characteristics”.
tPRO [ms] × 1.2 × 10−3
0.6
120
100
tPRO [ms]
CSP [µF] ≅
80
60
40
20
0
0
0.05
0.10
0.15
0.20
0.25
CSP [µF]
Figure 18
Seiko Instruments Inc.
CSP vs. tPRO
21
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S-8365/8366 Series
5. External transistor
A bipolar (NPN) or enhanced (Nch) MOS FET transistor can be used as an external transistor.
5.1
Bipolar NPN type
The driving ability to increase output current by using a bipolar transistor is determined based on the hFE value
and Rb value of the bipolar transistor. Figure 19 shows the peripheral circuit.
VDD
Cb
2200 pF
Pch
EXT
Nch
Figure 19
IPK
Rb
1 kΩ
External Transistor Peripheral Circuit
The recommended Rb value is around 1 kΩ. Calculate the required base current (Ib) based on the hFE value of
IPK
, and then select an Rb value smaller than that determined using:
the bipolar transistor by using Ib = h
FE
VDD − 0.7
0.4
Rb =
－
Ib
I
EXTH
Smaller Rb values increase the output current, but decrease the efficiency. Actually, the current might flow on
pulses or the VDD or VSS voltage might drop due to wiring resistance, so determine the optimum value based on
experimentation.
Inserting a speed-up capacitor (Cb) in parallel with the Rb resistor as shown in Figure 19 reduces switching loss
and increases efficiency.
1
.
Select a speed-up capacitor for which the Cb value satisfies Cb ≤
2 × π × Rb × fOSC × 0.7
Actually, however, the optimum Cb value varies depending on the characteristics of the bipolar transistor used,
so determine the optimum value based on experimentation.
5.2
Enhanced MOS FET type
Use an Nch power MOS FET. A MOS FET that has low ON-resistance (RON) and input capacitance (CISS) is
ideal for gaining efficiency. The ON-resistance and input capacitance generally have a tradeoff relationship.
ON-resistance is efficient in the range where the output current is high with relatively low frequency switching,
and input capacitance is efficient in the range where the output current is medium to low with high frequency
switching. Therefore, select a MOS FET for which the ON-resistance and input capacitance are optimum under
your usage conditions.
The input voltage (VDD) is supplied as the gate voltage of a MOS FET, so select a MOS FET for which the gate
withstand voltage is higher than the maximum value used for the input voltage, and for which the drain
withstand voltage is greater than or equal to the output voltage (VOUT) + the forward voltage of the diode (VD).
If a MOS FET for which the threshold value is near the UVLO detection voltage is used, a high current flows
upon power-on, and, in the worst case, the output voltage might not increase and the timer latch type
short-circuit protection circuit might operate. Therefore, select a MOS FET for which the threshold value is
sufficiently lower than the UVLO detection voltage.
22
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6. Output voltage setting resistors (RFB1, RFB2), capacitor for phase compensation (CFB)
For the S-8365/8366 Series, VOUT can be set to any value by using external divider resistors. Connect the divider
resistors between the VOUT and VSS pins.
Because VFB = 0.6 V typ., VOUT can be calculated by using the following equation :
VOUT =
RFB1 + RFB2
× 0.6
RFB2
Connect divider resistors RFB1 and RFB2 as close to the IC as possible to minimize the effects of noise. If noise has
an effect, adjust the values of RFB1 and RFB2 so that RFB1 + RFB2 < 100 kΩ.
CFB, which is connected in parallel with RFB1, is a capacitor for phase compensation.
By setting the zero point (the phase feedback) by adding capacitor CFB to output voltage setting resistor RFB1 in
parallel, the phase margin increases, improving the stability of the feedback loop. To effectively use the feedback
portion of the phase based on the zero point, define CFB by using the following equation :
CFB ≅
L × COUT
VOUT
× V
3 × RFB1
DD
This equation is only a guide.
The following explains the optimum setting.
To efficiently use the feedback portion of the phase based on the zero point, specify settings so that the phase
feeds back at the zero point frequency (fzero) of RFB1 and CFB according to the phase delay at the pole frequency
(fpole) of L and COUT. The zero point frequency is generally set slightly higher than the pole frequency.
The following equations are used to determine the pole frequency of L and COUT and the zero point frequency set
using RFB1 and CFB.
1
VDD
× V
OUT
L × COUT
1
fzero ≅
2 × π × RFB1 × CFB
fpole ≅
2×π×
The transient response can be improved by setting the zero point frequency in a lower frequency range. If, however,
the zero point frequency is set in a significantly lower range, the gain increases in the range of high frequency and
the phase margin decreases. This might result in unstable operation. Determine the proper value after sufficient
evaluation with actual application.
The typical constants based on our evaluation are shown in Table 15.
Table 15
Example of Constant for External Parts
VOUT(S) [V]
VDD [V]
RFB1 [kΩ]
RFB2 [kΩ]
CFB [pF]
L [µH]
COUT [µF]
1.8
1.8
3.32
3.32
5.0
5.0
9.0
9.0
15.0
15.0
1.2
1.2
1.2
1.2
1.8
1.8
3.3
3.3
3.3
3.3
30
30
68
68
110
110
210
210
360
360
15
15
15
15
15
15
15
15
15
15
100
82
82
68
68
56
39
33
39
33
3.3
2.2
3.3
2.2
3.3
2.2
3.3
2.2
3.3
2.2
10
10
10
10
22
22
22
22
22
22
Seiko Instruments Inc.
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Standard Circuit
(1) With short-circuit protection (SNT-6A, SOT-23-6)
L
SD
VDD
VOUT
Triangular wave
oscillation circuit
UVLO
circuit
PWM comparator
M1
PWM control, or
PWM / PFM switching
control circuit
EXT
+
−
Error
amplifier
+
−
CFB
RFB1
FB
Timer latch short-circuit
protection circuit
VIN CIN 0.1 µF
ON/OFF
RFB2
Reference voltage
with soft-start circuit
ON/OFF
circuit
COUT
VSS
CSP
Ground point
Figure 20
(2) Without short-circuit protection (SOT-23-5)
L
SD
VDD
VOUT
Triangular wave
oscillation circuit
UVLO
circuit
PWM comparator
M1
EXT
VIN CIN 0.1 µF
ON/OFF
PWM control, or
PWM / PFM switching
control circuit
+
−
Error
amplifier
+
−
VSS
Ground point
Figure 21
24
Seiko Instruments Inc.
RFB1
FB
Reference voltage
with soft-start circuit
ON/OFF
circuit
CFB
RFB2
COUT
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(3) Low input voltage (SOT-23-5)
L
SD
IC internal
power supply
Q1
VIN CIN
ON/OFF
Triangular wave
oscillation circuit
PWM comparator
Cb
Rb EXT
VOUT
PWM control, or
PWM / PFM switching
control circuit
+
−
Error
amplifier
+
−
CFB
RFB1
FB
Reference voltage
with soft-start circuit
ON/OFF
circuit
VDD
RFB2
COUT
0.1 µF
VSS
Ground point
Figure 22
Caution The above connection diagram and constant will not guarantee successful operation. Perform
thorough evaluation using an actual application to set the constants.
Precaution
• Mount external capacitors and inductor as close as possible to the IC. Set single point ground.
• Characteristics ripple voltage and spike noise occur in IC containing switching regulators. Moreover rush current
flows at the time of a power supply injection. Because these largely depend on the inductor, the capacitor and
impedance of power supply used, fully check them using an actually mounted model.
• The 0.1 µF capacitor connected between the VDD and VSS pins is a bypass capacitor. It stabilizes the power
supply in the IC when application is used with a heavy load, and thus effectively works for stable switching
regulator operation. Allocate the bypass capacitor as close to the IC as possible, prioritized over other parts.
• Although the IC contains a static electricity protection circuit, static electricity or voltage that exceeds the limit of
the protection circuit should not be applied.
• The power dissipation of the IC greatly varies depending on the size and material of the board to be connected.
Perform sufficient evaluation using an actual application before designing.
• SII claims no responsibility for any disputes arising out of or in connection with any infringement by products
including this IC of patents owned by a third party.
Seiko Instruments Inc.
25
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
Application Circuits
Application circuits are examples. They may always not guarantee successful operation.
1. External parts for application circuits
Table 16
Part
Part Name
NR6028T-2R2M
LTF5022T-3R3M
Inductor
VLF3010ST-2R2M
VLF3010ST-3R3M
RB070M-30TR
Diode
RB050LA-30
Si2312BDS
Transistor
2SD2652
JMK107BJ106MA-T
LMK212BJ106KD-T
EMK316BJ106KF-T
Capacitor
TMK325B7106MN-T
C2012X5R1A106KT
C1005X7R1C104KT
GRM31CR71A106KA
* 1. DCR :
* 2. IMAX :
* 3. VF :
* 4. IF :
* 5. VR :
* 6. VDSS :
* 7. VGSS :
* 8. ID :
* 9. QG :
*10. RDS(ON ):
*11. VGS :
*12. VCEO :
*13. VEBO :
*14. IC :
*15. hFE :
*16. EDC :
26
Characteristics of External Parts
Manfuacturer
Characteristics
*1
2.2 µH, DCR = 0.020 Ω, IMAX*2 = 4.2 A,
Taiyo Yuden Co., Ltd.
L × W × H = 6.0 × 6.0 × 2.8 mm
3.3 µH, DCR*1 = 0.060 Ω, IMAX*2 = 2.7 A,
L × W × H = 5.0 × 5.2 × 2.2 mm
2.2 µH, DCR*1 = 0.114 Ω, IMAX*2 = 1.1 A,
TDK Corporation
L × W × H = 3.0 × 3.0 × 1.0 mm
*1
*2
3.3 µH, DCR = 0.168 Ω, IMAX = 0.87 A,
L × W × H = 3.0 × 3.0 × 1.0 mm
VF*3 = 0.44 V, IF*4 = 1.5 A, VR*5 = 30 V
L × W × H = 3.5 × 1.6 × 0.9 mm
Rohm Co., Ltd.
*3
*4
*5
VF = 0.45 V, IF = 3.0 A, VR = 30 V
L × W × H = 4.7 × 2.6 × 1.05 mm
VDSS*6 = 20 V, VGSS*7 = ±8 V, ID*8 = 5.0 A,
VISHAY
QG*9 = 12 nC max.
INTERTECHNOLOGY,
RDS(ON)*10 = 0.047 Ω max. (VGS*11 = 2.5 V)
INC.
L × W × H = 2.9 × 2.64 × 1.12 mm
*12
*13
*14
VCEO = 12 V, VEBO = 6 V, IC = 1.5 A,
*15
hFE = 270 min./680 max. (VCE/IC = 2 V/200 mA)
Rohm Co., Ltd.
L × W × H = 2.0 × 1.25 × 0.9 mm
10 µF, EDC*16 = 6.3 V, X5R,
L × W × H = 1.6 × 0.8 × 0.95 mm
10 µF, EDC*16 = 10 V, X5R,
L × W × H = 2.0 × 1.25 × 0.95 mm
Taiyo Yuden Co., Ltd.
10 µF, EDC*16 = 16 V, X5R,
L × W × H = 3.2 × 1.6 × 1.25 mm
10 µF, EDC*16 = 25 V, X7R,
L × W × H = 3.2 × 2.5 × 2.1 mm
10 µF, EDC*16 = 10 V, X5R,
L × W × H = 2.0 × 1.25 × 1.45 mm
TDK Corporation
*16
0.1 µF, EDC = 16 V, X7R,
L × W × H = 1.0 × 0.5 × 0.55 mm
Murata Manufacturing, 10 µF, EDC*16 = 10 V, X7R,
Co., Ltd.
L × W × H = 3.2 × 1.6 × 1.6 mm
DC resistance
Maximum allowable current
Forward voltage
Forward current
Reverse voltage
Drain-source voltage (during short-circuiting between the gate and source)
Gate-source voltage (during short-circuiting between the drain and source)
Drain current
Gate charge
On-resistance between the drain and source
Gate-source voltage
Collector-emitter voltage
Emitter-base voltage
Collector current
Direct current gain
Rated voltage
Seiko Instruments Inc.
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
2. Power supply for LCD
Following shows a circuit example and its characteristics for driving an LCD panel (with 9 V and 15 V outputs).
L
SD
M1
VDD
EXT
CIN CDD
VOUT
ON/OFF S-8365/8366
Series
CFB
RFB1
COUT
FB
CSP
RFB2
CSP
VSS
Figure 23
Table 17
Circuit Example (Power Supply for LCD)
External Part Examples (Power Supply for LCD) (1 / 2)
Output
IC Product
Voltage
Name
9V
S-8365AABBA
2
9V
3
15 V
4
15 V
Condition
1
Table 17
M1 Product
SD Product
Name
Name
NR6028T2R2M
Si2312BDS
RB050LA-30
S-8366AABBA
NR6028T2R2M
Si2312BDS
RB050LA-30
S-8365AABBA
NR6028T2R2M
Si2312BDS
RB050LA-30
S-8366AABBA
NR6028T2R2M
Si2312BDS
RB050LA-30
L Product Name
External Part Examples (Power Supply for LCD) (2 / 2)
Condition
CIN Product Name
COUT Product Name
RFB1
RFB2
CFB
CDD
1
LMK212BJ106KG-T
EMK316BJ106KF-T × 2
280 kΩ
20 kΩ
22 pF
0.1 µF
2
LMK212BJ106KG-T
EMK316BJ106KF-T × 1
280 kΩ
20 kΩ
27 pF
0.1 µF
3
LMK212BJ106KG-T
TMK325B7106MN-T × 2
360 kΩ
15 kΩ
27 pF
0.1 µF
4
LMK212BJ106KG-T
TMK325B7106MN-T × 1
360 kΩ
15 kΩ
33 pF
0.1 µF
Caution The above connection will not guarantee successful operation. Perform thorough evaluation
using an actual application to set the constant.
Seiko Instruments Inc.
27
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
3. Output Characteristics of Power Supply for LCD
Following shows the output current (IOUT) vs. efficiency (η) and output current (IOUT) vs. output voltage (VOUT)
characteristics for conditions 1 to 4 in Table 17.
VIN = 2.0 V
VIN = 3.3 V
VIN = 3.6 V
0.1
η [%]
Condition 2
100
90
80
70
60
50
40
30
20
10
0
0.1
1
100
90
80
70
60
50
40
30
20
10
0
10
IOUT [mA]
100
1000
VOUT [V]
η [%]
Condition 1
VIN = 2.0 V
VIN = 3.3 V
VIN = 3.6 V
1
10
IOUT [mA]
100
9.2
9.0
8.8
8.6
8.4
8.2
8.0
7.8
1000
VIN = 2.0 V
VIN = 3.3 V
VIN = 3.6 V
0.1
1
10
IOUT [mA]
100
1000
15.5
VIN = 3.3 V
VIN = 3.6 V
VIN = 5.5 V
VIN = 3.3 V
VIN = 3.6 V
VIN = 5.5 V
14.5
14.0
13.5
0.1
1
10
IOUT [mA]
100
13.0
1000
0.1
1
10
IOUT [mA]
100
1000
100
1000
15.5
15.0
VIN = 5.5 V
VIN = 3.6 V
VIN = 3.3 V
η [%]
Condition 4
100
90
80
70
60
50
40
30
20
10
0
0.1
28
15.0
VOUT [V]
100
90
80
70
60
50
40
30
20
10
0
VOUT [V]
η [%]
Condition 3
14.5
VIN = 3.3 V
VIN = 3.6 V
VIN = 5.5 V
14.0
13.5
13.0
1
10
IOUT [mA]
100
1000
0.1
Seiko Instruments Inc.
1
10
IOUT [mA]
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
4. Power supply for high output current
Following shows a circuit example and its characteristics for outputting 3.3 V from two dry cells (1.8 V) and
satisfying IOUT = 800 mA.
L
SD
M1
VDD
CFB
EXT
CIN CDD
ON/OFF
VOUT
S-8365/8366
Series
RFB1
COUT
FB
CSP
RFB2
CSP
VSS
Figure 24
Table 18
Condition
Circuit Example (Power Supply for High Output Current)
External Part Examples (Power Supply for High Output Current) (1 / 2)
Output
Voltage
IC Product Name
L Product Name
M1 Product
SD Product
Name
Name
1
3.32 V
S-8365AABBA
NR6028T2R2M
Si2312BDS
RB050LA-30
2
3.32 V
S-8365ABBBA
LTF5022-3R3M
Si2312BDS
RB050LA-30
3
3.32 V
S-8366AABBA
NR6028T2R2M
Si2312BDS
RB050LA-30
4
3.32 V
S-8366ABBBA
LTF5022-3R3M
Si2312BDS
RB050LA-30
Table 18
External Part Examples (Power Supply for High Output Current) (2 / 2)
Condition
CIN Product Name
COUT Product Name
RFB1
RFB2
CFB
CDD
1
C2012X5R1A106KT
GRM31CR71A106KA × 2
68 kΩ
15 kΩ
68 pF
0.1 µF
2
C2012X5R1A106KT
GRM31CR71A106KA × 2
68 kΩ
15 kΩ
82 pF
0.1 µF
3
C2012X5R1A106KT
GRM31CR71A106KA × 2
68 kΩ
15 kΩ
68 pF
0.1 µF
4
C2012X5R1A106KT
GRM31CR71A106KA × 2
68 kΩ
15 kΩ
82 pF
0.1 µF
Caution The above connection will not guarantee successful operation. Perform thorough evaluation
using an actual application to set the constant.
Seiko Instruments Inc.
29
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
5. Output characteristics of power supply for high output current
Following shows the output current (IOUT) vs. efficiency (η) and output current (IOUT) vs. output voltage (VOUT)
characteristics for conditions 1 to 4 in Table 18.
VIN = 1.8 V
VIN = 2.7 V
0.1
1
VOUT [V]
100
90
80
70
60
50
40
30
20
10
0
10
100
IOUT [mA]
η [%]
Condition 2
100
VIN = 1.8 V
90
80
VIN = 2.7 V
70
60
50
40
30
20
10
0
0.1
1
10
100
IOUT [mA]
1000 10000
VIN = 1.8 V
VIN = 2.7 V
30
10
100
IOUT [mA]
1000
VIN = 1.8 V
VIN = 2.7 V
1
10
100
IOUT [mA]
1000
10000
VIN = 1.8 V
VIN = 2.7 V
1
10
100
IOUT [mA]
1000
10000
1000
10000
3.5
3.4
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
10000
VIN = 1.8 V
VIN = 2.7 V
0.1
1
η [%]
Condition 4
100
90
80
70
60
50
40
30
20
10
0
0.1
10000
VOUT [V]
η [%]
Condition 3
100
90
80
70
60
50
40
30
20
10
0
0.1
1000
3.5
3.4
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
0.1
η [%]
Condition 1
Seiko Instruments Inc.
1
10
100
IOUT [mA]
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
6. Circuit for low power supply voltage applications
Following shows a circuit example that starts up by using a dry cell (1.2 V) and its characteristics.
L
SD
Cb
VDD
EXT
ON/OFF
CIN CDD
S-8365/8366
Series
VOUT
Q1
CFB
RFB1
Rb
COUT
FB
RFB2
VSS
Figure 25
Table 19
Circuit Example (Circuit for Low Power Supply Voltage Applications)
External Part Examples (Circuit for Low Power Supply Voltage Applications) (1 / 2)
Q1
Output
IC Product
Voltage
Name
1
3.32 V
S-8366AAAAA
VLF3010ST-2R2M
2SD2652
RB070M-30TR
2
3.32 V
S-8366ABAAA
VLF3010ST-3R3M
2SD2652
RB070M-30TR
Condition
Table 19
L Product Name
SD Product Name
Product
Name
External Part Examples (Circuit for Low Power Supply Voltage Applications) (2 / 2)
Condition
CIN Product Name
COUT Product Name
RFB1
RFB2
CFB
CDD
1
JMK107BJ106MA-T
LMK212BJ106KD-T × 1
68 kΩ
15 kΩ
68 pF
0.1 µF
2
JMK107BJ106MA-T
LMK212BJ106KD-T × 1
68 kΩ
15 kΩ
82 pF
0.1 µF
Caution The above connection will not guarantee successful operation. Perform thorough evaluation
using an actual application to set the constant.
Seiko Instruments Inc.
31
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
7. Output characteristics of circuits for low power supply voltage applications
Following shows the output current (IOUT) vs. efficiency (η) and output current (IOUT) vs. output voltage (VOUT)
characteristics for conditions 1 and 2 in Table 19.
VIN = 0.9 V
VIN = 1.2 V
VIN = 1.5 V
0.1
1
10
IOUT [mA]
100
1000
η [%]
Condition 2
90
80
VIN = 0.9 V
70
VIN = 1.2 V
60
VIN = 1.5 V
50
40
30
20
10
0
0.1
1
90
80
70
60
50
40
30
20
10
0
VOUT [V]
η [%]
Condition 1
32
10
IOUT [mA]
100
1000
3.5
3.4
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
100
1000
VIN = 0.9 V
VIN = 1.2 V
VIN = 1.5 V
0.1
Seiko Instruments Inc.
1
10
IOUT [mA]
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
Characteristics (Typical Data)
1. Examples of Major Power Supply Dependence Characteristics (Ta = 25°C)
(2) Current consumption during shutdown (ISSS) vs.
Input voltage (VIN)
1.0
0.8
ISSS [µA]
ISS1 [µA]
(1) Current consumption during operation (ISS1) vs.
Input voltage (VIN)
700
600
1.2 MHz
500
400
300
600 kHz
200
100
0
1.8 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN [V]
0.0
1.8 2.0
1.1
1.0
1.8 2.0
2.5
3.0
3.5 4.0
VIN [V]
4.5
5.0
600 kHz
90
85
1.2 MHz
80
75
70
1.8 2.0
2.5
3.0
3.5 4.0
VIN [V]
3.5 4.0
VIN [V]
4.5
5.0
5.5
650
600
550
500
1.8 2.0
2.5
3.0
3.5 4.0
VIN [V]
4.5
5.0
5.5
(5) Soft-start time (tSS) vs. Input voltage (VIN)
10
9
8
7
6
5
4
3
2
1
0
1.8 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN [V]
tSS [ms]
MaxDuty [%]
95
3.0
fOSC = 600 kHz
5.5
(4) Maximum duty ratio (MaxDuty) vs. Input voltage (VIN)
100
2.5
700
fOSC [kHz]
fOSC [MHz]
1.2
0.4
0.2
(3) Oscillation frequency (fosc) vs. Input voltage (VIN)
fOSC = 1.2 MHz
1.4
1.3
0.6
4.5
5.0
5.5
PFMDuty [%]
(6) PWM / PFM switching duty ratio (PFMDuty) vs. Input voltage (VIN)
40
35
30
25
20
15
10
5
0
1.8 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN [V]
Seiko Instruments Inc.
33
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
(8) Low level input voltage (VSL) vs. Input voltage (VIN)
0.8
0.7
0.7
0.6
0.6
VSL [V]
VSH [V]
(7) High level input voltage (VSH) vs. Input voltage (VIN)
0.8
0.5
0.4
0.3
1.8 2.0
0.4
2.5
3.0
3.5 4.0
VIN [V]
4.5
5.0
0.8
0.6
0.5
0.4
2.5
3.0
3.5 4.0
VIN [V]
4.5
5.0
5.5
(11) EXT pin output current “H” (IEXTH) vs. Input voltage (VIN)
−300
4.5
5.0
5.5
(12) EXT pin output current “L” (IEXTL) vs. Input voltage (VIN)
300
IEXTH [mA]
IEXTH [mA]
3.5 4.0
VIN [V]
250
−200
−150
−100
−50
34
3.0
(10) Short-circuit protection delay time (tPRO) vs. Input
voltage (VIN)
CSP = 0.1 µF
80
70
60
50
40
30
20
10
0
1.8 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN [V]
−250
0
1.8 2.0
2.5
tPRO [ms]
0.7
VFB [V]
0.3
1.8 2.0
5.5
(9) FB voltage (VFB) vs. Input voltage (VIN)
0.3
1.8 2.0
0.5
200
150
100
50
2.5
3.0
3.5 4.0
VIN [V]
4.5
5.0
5.5
0
1.8 2.0
Seiko Instruments Inc.
2.5
3.0
3.5 4.0
VIN [V]
4.5
5.0
5.5
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
2. Examples of Major Temperature Characteristics (Ta = −40 to 85°C)
fOSC = 600 kHz
ISS1 [µA]
ISS1 [µA]
(1) Current consumption during operation (ISS1) vs. Temperature (Ta)
fOSC = 1.2 MHz
700
700
VDD = 5.5 V
600
600
VDD = 5.5 V
VDD = 3.6 V
500
500
VDD = 2.0 V
VDD = 3.6 V
400
400
300
300
VDD = 2.0 V
200
200
100
100
0
0
−40 −25
0
25
50
75 85
−40 −25
0
Ta [°C]
25
Ta [°C]
50
75 85
ISSS [µA]
(2) Current consumption during shutdown (ISSS) vs. Temperature (Ta)
1.0
0.9
0.8
0.7
0.6
VDD = 5.5 V
0.5
0.4
VDD = 3.6 V
0.3
VDD = 2.0 V
0.2
0.1
0.0
−40 −25
0
25
50
75 85
Ta [°C]
1.1
1.0
−40 −25
25
Ta [°C]
50
MaxDuty [%]
75
−40 −25
600
550
75 85
80
25
Ta [°C]
50
75 85
−40 −25
0
25
Ta [°C]
50
75 85
fOSC = 600 kHz
100
95
90
VDD = 5.5 V
VDD = 3.6 V
VDD = 2.0 V
85
80
75
70
0
VDD = 5.5 V
VDD = 3.6 V
VDD = 2.0 V
650
500
0
(4) Maximum duty ratio (MaxDuty) vs. Temperature (Ta)
fOSC = 1.2 MHz
100
VDD = 5.5 V
95
VDD = 3.6 V
90
VDD = 2.0 V
85
70
fOSC [kHz]
1.2
fOSC = 600 kHz
700
MaxDuty [%]
fOSC [MHz]
(3) Oscillation frequency (fOSC) vs. Temperature (Ta)
fOSC = 1.2 MHz
1.4
VDD = 5.5 V
VDD = 3.6 V
1.3
VDD = 2.0 V
−40 −25
Seiko Instruments Inc.
0
25
Ta [°C]
50
75 85
35
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
10
9
8
7
6
5
4
3
VDD = 5.5 V
VDD = 3.6 V
VDD = 2.0 V
−40 −25
0
25
Ta [°C]
50
75 85
(7) High level input voltage (VSH) vs. Temperature (Ta)
0.8
0.6
VDD = 5.5 V
VDD = 3.6 V
VDD = 2.0 V
(8) Low level input voltage (VSL) vs. Temperature (Ta)
0.8
0.7
VSL [V]
VSH [V]
0.7
(6) PWM / PFM switching duty ratio (PFMDuty) vs.
Temperature (Ta)
36
34
32
30
28
VDD = 5.5 V
26
VDD = 3.6 V
24
VDD = 2.0 V
22
20
−40 −25
0
25
50
75 85
Ta [°C]
PFMDuty [%]
tSS [ms]
(5) Soft-start time (tSS) vs. Temperature (Ta)
0.5
0.4
0.3
VDD = 5.5 V
VDD = 3.6 V
VDD = 2.0 V
0.6
0.5
0.4
−40 −25
0.3
0
25
Ta [°C]
50
75 85
−40 −25
0
25
Ta [°C]
50
75 85
(11) FB voltage (VFB) vs. Temperature (Ta)
(12) Short-circuit protection delay time (tPRO) vs.
Temperature (Ta)
CSP = 0.1 µF
80
VFB [V]
0.61
VDD = 5.5 V
VDD = 3.6 V
VDD = 2.0 V
70
tPRO [ms]
0.62
0.60
0.59
0.58
36
VUVLOHYS [V]
(10) UVLO hysteresis width (VUVLOHYS) vs. Temperature (Ta)
0.20
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0.00
−40 −25
0
25
50
75 85
Ta [°C]
VUVLO+ [V]
(9) UVLO release voltage (VUVLO+) vs. Temperature (Ta)
1.80
1.75
1.70
1.65
1.60
1.55
1.50
1.45
1.40
−40 −25
0
25
50
75 85
Ta [°C]
VDD = 5.5 V
VDD = 3.6 V
VDD = 2.0 V
60
50
40
−40 −25
30
0
25
Ta [°C]
50
75 85
−40 −25
Seiko Instruments Inc.
0
25
Ta [°C]
50
75 85
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
(14) EXT pin output current “L” (IEXTL) vs. Temperature (Ta)
IEXTL [mA]
IEXTH [mA]
(13) EXT pin output current “H” (IEXTH) vs.
Temperature (Ta)
−350
VDD = 5.5 V
−300
VDD = 3.6 V
−250
VDD = 2.0 V
−200
−150
−100
−50
0
−40 −25
0
25
50
75 85
Ta [°C]
0.6
S-8366 Series
0.4
25
Ta [°C]
50
75 85
S-8365 Series
0.8
−40 −25
0.6
S-8366 Series
0.4
0.0
0
25
Ta [°C]
50
75 85
−40 −25
0
25
Ta [°C]
50
75 85
fOSC = 600 kHz
VST2 [V]
VST2 [V]
0
0.2
(16) Oscillation start voltage (VST2) vs. Temperature (Ta)
fOSC = 1.2 MHz
1.4
1.2
1.0
S-8365 Series
0.8
0.6
0.4
S-8366 Series
0.2
0.0
−40 −25
0
25
50
75 85
Ta [°C]
VHLD [V]
(17) Operation holding voltage (VHLD) vs. Temperature (Ta)
fOSC = 1.2 MHz
1.4
1.2
1.0
S-8365 Series
0.8
S-8366 Series
0.6
0.4
0.2
0.0
−40 −25
0
25
50
75 85
Ta [°C]
VHLD [V]
−40 −25
fOSC = 600 kHz
0.2
0.0
VDD = 5.5 V
VDD = 3.6 V
VDD = 2.0 V
1.0
VST1 [V]
VST1 [V]
(15) Operating start voltage (VST1) vs. Temperature (Ta)
fOSC = 1.2 MHz
1.0
S-8365 Series
0.8
350
300
250
200
150
100
50
0
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
S-8365 Series
S-8366 Series
−40 −25
0
25
Ta [°C]
50
75 85
fOSC = 600 kHz
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
S-8365 Series
S-8366 Series
−40 −25
Seiko Instruments Inc.
0
25
Ta [°C]
50
75 85
37
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
3. Examples of Transient Response Characteristics
Unless otherwise specified, the used parts are those in Table 10 External Parts List.
At power-on (VOUT(S) = 5.0 V, VIN = 0 V → 3.3 V, PWM control, Ta = 25°C)
4.0
3.0
VIN
3.0
2.0
IL
2.0
IL [A]
VIN, VOUT [V]
4.0
1.0
0.0
0
5
10
t [ms]
15
(4) fOSC = 600 kHz, IOUT = 600 mA
6.0
5.0
20
S-8365ABBBA
6.0
5.0
VOUT
4.0
4.0
3.0
VIN
3.0
2.0
IL
2.0
1.0
1.0
0.0
0.0
0
5
10
t [ms]
15
20
At power-on (VOUT(S) = 5.0 V, VIN = 0 V → 3.3 V, PWM / PFM switching control, Ta = 25°C))
5.0
3.0
2.0
IL
0.0
5
10
t [ms]
15
6.0
5.0
VOUT
4.0
3.0
4.0
3.0
VIN
2.0
2.0
IL
1.0
1.0
0.0
0
5
10
t [ms]
(4) fOSC = 600 kHz, IOUT = 600 mA
6.0
4.0
3.0
S-8366AABBA
0.0
5.0
VIN
0
5.0
6.0
2.0
1.0
(2) fOSC = 1.2 MHz, IOUT = 600 mA
6.0
S-8366ABBBA
VOUT
4.0
5.0
15
20
S-8366ABBBA
6.0
5.0
VOUT
4.0
4.0
3.0
VIN
3.0
2.0
IL
2.0
1.0
1.0
0.0
0.0
20
Seiko Instruments Inc.
IL [A]
S-8366AABBA
1.0
0.0
0
5
10
t [ms]
15
20
IL [A]
(3) fOSC = 600 kHz, IOUT = 1 mA
6.0
38
5.0
VOUT
1.0
VIN, VOUT [V]
S-8365ABBBA
(1) fOSC = 1.2 MHz, IOUT = 1 mA
VIN, VOUT [V]
6.0
0.0
VIN, VOUT [V]
5.0
S-8365AABBA
IL [A]
(2) fOSC = 1.2 MHz, IOUT = 600 mA
6.0
VIN, VOUT [V]
(3) fOSC = 600 kHz, IOUT = 1 mA
3.2
S-8365AABBA
(1) fOSC = 1.2 MHz, IOUT = 1 mA
IL [A]
3.1
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
Shutdown pin response (VOUT = 5.0 V, VIN = 3.3 V, VON/OFF = 0 V → 3.3 V, PWM control, Ta = 25°C)
1.0
IL
5
10
t [ms]
(3) fOSC = 600 kHz, IOUT = 1 mA
6.0
5.0
0.0
15
4.0
3.0
5.0
4.0
3.0
2.0
0.0
0
5
0.0
10
t [ms]
15
20
2.0
1.0
IL [A]
2.0
IL
1.0
0.0
5
10
t [ms]
15
20
S-8365ABBBA
3.0
4.0
3.0
VON/OFF
2.0
2.0
1.0
1.0
IL
0.0
0.0
0
5
10
t [ms]
(3) fOSC = 600 kHz, IOUT = 1 mA
6.0
5.0
15
3.0
4.0
3.0
1.0
IL
0.0
0.0
0
5
10
t [ms]
15
4.0
3.0
VON/OFF
2.0
2.0
IL
1.0
1.0
0.0
5
10
t [ms]
(4) fOSC = 600 kHz, IOUT = 600 mA
6.0
5.0
2.0
1.0
3.0
0
6.0
VON/OFF
5.0
0.0
S-8366ABBBA
2.0
6.0
VOUT
4.0
20
VOUT
4.0
5.0
S-8366AABBA
5.0
15
20
S-8366ABBBA
6.0
5.0
VOUT
4.0
3.0
4.0
3.0
VON/OFF
2.0
2.0
IL
1.0
1.0
0.0
0.0
20
Seiko Instruments Inc.
IL [A]
5.0
VOUT
4.0
(2) fOSC = 1.2 MHz, IOUT = 600 mA
6.0
6.0
0
5
10
t [ms]
15
20
39
IL [A]
5.0
S-8366AABBA
VON/OFF, VOUT [V]
(1) fOSC = 1.2 MHz, IOUT = 1 mA
6.0
VON/OFF, VOUT [V]
3.0
Shutdown pin response (VOUT = 5.0 V, VIN = 3.3 V, VON/OFF = 0 V → 3.3 V, PWM / PFM switching control, Ta = 25°C)
VON/OFF, VOUT [V]
3.4
1.0
IL
4.0
VON/OFF
(4) fOSC = 600 kHz, IOUT = 600 mA
6.0
2.0
1.0
3.0
0
S-8365ABBBA
VON/OFF
5.0
VOUT
4.0
20
VOUT
6.0
0.0
1.0
5.0
S-8365AABBA
2.0
2.0
VON/OFF, VOUT [V]
3.0
VON/OFF
0
VON/OFF, VOUT [V]
4.0
IL [A]
3.0
0.0
VON/OFF, VOUT [V]
5.0
VOUT
4.0
(2) fOSC = 1.2 MHz, IOUT = 600 mA
6.0
6.0
IL [A]
5.0
S-8365AABBA
IL [A]
VON/OFF, VOUT [V]
(1) fOSC = 1.2 MHz, IOUT = 1 mA
6.0
IL [A]
3.3
S-8365/8366 Series
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
Power supply voltage fluctuations (VOUT = 5.0 V, IOUT = 1 mA, PWM control, Ta = 25°C)
4.90
8
6
VIN
4.85
4
4.80
2
4.75
0
0
2
4
6
8
10
t [ms]
(4) fOSC = 600 kHz, VIN = 3.8 V → 2.8 V
(2) fOSC = 1.2 MHz, VIN = 3.8 V → 2.8 V
5.15
5.10
8
5.05
VOUT
5.00
4.95
6
4
VIN
0
2
4
6
8
VOUT [V]
10
5.05
4.85
4.95
4.90
0
4.85
10
(3) fOSC = 600 kHz, VIN = 2.8 V → 3.8 V
5.15
8
6
5.00
4.95
4
VIN
4.90
2
0
4.85
0
2
4
6
8
10
VOUT
5.05
VIN [V]
10
5.10
t [ms]
Seiko Instruments Inc.
4
2
0
0.4
0.8
1.2
t [ms]
(4) fOSC = 600 kHz, VIN = 3.8 V → 2.8 V
6
VIN
0.0
S-8366ABBBA
12
8
VOUT
5.00
2
S-8366AABBA
12
10
t [ms]
VOUT [V]
S-8365ABBBA
VIN [V]
S-8366AABBA
12
5.10
4.90
40
Power supply voltage fluctuations (VOUT = 5.0 V, IOUT = 1 mA, PWM / PFM switching control, Ta = 25°C)
(1) fOSC = 1.2 MHz, VIN = 2.8 V → 3.8 V
5.15
VOUT [V]
1.6
2.0
S-8366ABBBA
3.6
S-8365ABBBA
VIN [V]
(3) fOSC = 600 kHz, VIN = 2.8 V → 3.8 V
S-8365AABBA
10
VOUT
4.95
(2) fOSC = 1.2 MHz, VIN = 3.8 V → 2.8 V
VOUT [V]
5.00
S-8365AABBA
12
(1) fOSC = 1.2 MHz, VIN = 2.8 V → 3.8 V
5.05
VIN [V]
3.5
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
Power supply voltage fluctuations (VOUT = 5.0 V, IOUT = 500 mA, PWM control, Ta = 25°C)
(3) fOSC = 600 kHz, VIN = 2.8 V → 3.8 V
(4) fOSC = 600 kHz, VIN = 3.8 V → 2.8 V S-8365ABBBA
16
5.60
5.40
14
5.20
12
VOUT
5.00
10
4.80
8
4.60
6
4.40
4
VIN
4.20
2
0
4.00
0.0
0.2
0.4
0.6
0.8
1.0
t [ms]
VOUT [V]
VIN [V]
VOUT [V]
(4) fOSC = 600 kHz, VIN = 3.8 V → 2.8 V S-8366ABBBA
16
5.60
5.40
14
5.20
12
5.00
10
4.80
8
4.60
6
4.40
4
4.20
2
0
4.00
0.0
0.2
0.4
0.6
0.8
1.0
t [ms]
VIN [V]
(3) fOSC = 600 kHz, VIN = 2.8 V → 3.8 V S-8366ABBBA
16
5.60
5.40
14
5.20
12
VOUT
5.00
10
4.80
8
4.60
6
VIN
4.40
4
4.20
2
0
4.00
0.0
0.2
0.4
0.6
0.8
1.0
t [ms]
VOUT [V]
(2) fOSC = 1.2 MHz, VIN = 3.8 V → 2.8 V S-8366AABBA
16
5.60
5.40
14
5.20
12
VOUT
5.00
10
4.80
8
4.60
6
4.40
4
VIN
4.20
2
0
4.00
0.0
0.2
0.4
0.6
0.8
1.0
t [ms]
Seiko Instruments Inc.
41
VIN [V]
Power supply voltage fluctuations (VOUT = 5.0 V, IOUT = 500 mA, PWM / PFM switching control, Ta = 25°C)
(1) fOSC = 1.2 MHz, VIN = 2.8 V → 3.8 V S-8366AABBA
16
5.60
5.40
14
5.20
12
VOUT
5.00
10
4.80
8
4.60
6
VIN
4.40
4
4.20
2
0
4.00
0.0
0.2
0.4
0.6
0.8
1.0
t [ms]
VOUT [V]
S-8365AABBA
VIN [V]
VOUT [V]
VIN [V]
3.8
S-8365ABBBA
(2) fOSC = 1.2 MHz, VIN = 3.8 V → 2.8 V
VOUT [V]
(1) fOSC = 1.2 MHz, VIN = 2.8 V → 3.8 V S-8365AABBA
16
5.60
5.40
14
5.20
12
VOUT
5.00
10
4.80
8
4.60
6
VIN
4.40
4
4.20
2
0
4.00
0.0
0.2
0.4
0.6
0.8
1.0
t [ms]
VIN [V]
3.7
S-8365/8366 Series
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
Load fluctuations (VOUT = 5.0 V, VIN = 3.3 V, IOUT = 0.1 mA → 100 mA → 0.1 mA, PWM control, Ta = 25°C)
(4) fOSC = 600 kHz, IOUT = 100 mA → 0.1 mA S-8366ABBBA
1600
5.40
5.30
1400
5.20
1200
5.10
1000
VOUT
5.00
800
4.90
600
4.80
400
4.70
200
IOUT
0
4.60
0
5 10 15 20 25 30 35 40
t [ms]
Seiko Instruments Inc.
IOUT [mA]
IOUT [mA]
VOUT [V]
(2) fOSC = 1.2 MHz, IOUT = 100 mA → 0.1 mA S-8366AABBA
(3) fOSC = 600 kHz, IOUT = 0.1 mA → 100 mA S-8366ABBBA
1600
5.40
5.30
1400
5.20
1200
5.10
1000
VOUT
5.00
800
4.90
600
4.80
400
IOUT
4.70
200
0
4.60
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
t [ms]
42
Load fluctuations (VOUT = 5.0 V, VIN = 3.3 V, IOUT = 0.1 mA → 100 mA → 0.1 mA, PWM / PFM switching control, Ta = 25°C)
(1) fOSC = 1.2 MHz, IOUT = 0.1 mA → 100 mA S-8366AABBA
VOUT [V]
3.10
(4) fOSC = 600 kHz, IOUT = 100 mA → 0.1 mA S-8365ABBBA
VOUT [V]
(3) fOSC = 600 kHz, IOUT = 0.1 mA → 100 mA S-8365ABBBA
1600
5.40
5.30
1400
5.20
1200
5.10
1000
VOUT
5.00
800
4.90
600
4.80
400
IOUT
4.70
200
0
4.60
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
t [ms]
(2) fOSC = 1.2 MHz, IOUT = 100 mA → 0.1 mA S-8365AABBA
IOUT [mA]
VOUT [V]
(1) fOSC = 1.2 MHz, IOUT = 0.1 mA → 100 mA S-8365AABBA
1600
5.40
5.30
1400
5.20
1200
5.10
1000
VOUT
5.00
800
4.90
600
4.80
400
IOUT
4.70
200
0
4.60
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
t [ms]
IOUT [mA]
3.9
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
(4) fOSC = 600 kHz, IOUT = 300 mA → 0.1 mA S-8366ABBBA
5.60
5.40
5.20
VOUT
5.00
4.80
4.60
4.40
4.20
IOUT
4.00
0
10
20
30
40
50
t [ms]
Seiko Instruments Inc.
1600
1400
1200
1000
800
600
400
200
0
43
IOUT [mA]
IOUT [mA]
IOUT [mA]
IOUT [mA]
(2) fOSC = 1.2 MHz, IOUT = 300 mA → 0.1 mA S-8366AABBA
1600
5.60
5.40
1400
5.20
1200
5.00
1000
VOUT
4.80
800
4.60
600
4.40
400
4.20
200
IOUT
0
4.00
0
5 10 15 20 25 30 35 40
t [ms]
VOUT [V]
VOUT [V]
(3) fOSC = 600 kHz, IOUT = 0.1 mA → 300 mA S-8366ABBBA
VOUT [V]
Load fluctuations (VOUT = 5.0 V, VIN = 3.3 V, IOUT = 0.1 mA → 300 mA → 0.1 mA, PWM / PFM switching control, Ta = 25°)
(1) fOSC = 1.2 MHz, IOUT = 0.1 mA → 300 mA S-8366AABBA
1600
5.60
5.40
1400
5.20
1200
VOUT
5.00
1000
4.80
800
4.60
600
IOUT
4.40
400
4.20
200
0
4.00
0.0
0.2
0.4
0.6
0.8
1.0
t [ms]
(4) fOSC = 600 kHz, IOUT = 300 mA → 0.1 mA S-8365ABBBA
1600
5.60
5.40
1400
5.20
1200
5.00
1000
VOUT
4.80
800
4.60
600
4.40
400
4.20
200
IOUT
0
4.00
0
5 10 15 20 25 30 35 40
t [ms]
VOUT [V]
3.12
(2) fOSC = 1.2 MHz, IOUT = 300 mA → 0.1 mA S-8365AABBA
1600
5.60
5.40
1400
5.20
1200
5.00
1000
VOUT
4.80
800
4.60
600
4.40
400
4.20
200
IOUT
0
4.00
0
5 10 15 20 25 30 35 40
t [ms]
VOUT [V]
VOUT [V]
(3) fOSC = 600 kHz, IOUT = 0.1 mA → 300 mA S-8365ABBBA
1600
5.60
5.40
1400
5.20
1200
VOUT
5.00
1000
4.80
800
4.60
600
IOUT
4.40
400
4.20
200
0
4.00
0.0
0.2
0.4
0.6
0.8
1.0
t [ms]
IOUT [mA]
VOUT [V]
(1) fOSC = 1.2 MHz, IOUT = 0.1 mA → 300 mA S-8365AABBA
1600
5.60
5.40
1400
5.20
1200
VOUT
5.00
1000
4.80
800
4.60
600
IOUT
4.40
400
4.20
200
0
4.00
0.0
0.2
0.4
0.6
0.8
1.0
t [ms]
IOUT [mA]
Load fluctuations (VOUT = 5.0 V, VIN = 3.3 V, IOUT = 0.1 mA → 300 mA → 0.1 mA, PWM control, Ta = 25°C)
IOUT [mA]
3.11
S-8365/8366 Series
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
Reference Data
Reference data is provided to determine specific external components. Therefore, the following data shows the
characteristics of the recommended external components selected for various applications.
1. External parts
Table 20 Efficiency vs. Output Current Characteristics and Output Voltage vs. Output Current Characteristics for
External Parts (1 / 2)
Oscillation
Control
Output
L
M1
SD
Condition Product Name
Frequency
System
Voltage
1
2
3
4
5
6
7
8
9
10
11
12
S-8365AABBA
S-8365ABBBA
S-8366AABBA
S-8366ABBBA
S-8365AABBA
S-8365ABBBA
S-8366AABBA
S-8366ABBBA
S-8365AABBA
S-8365ABBBA
S-8366AABBA
S-8366ABBBA
1.2 MHz
600 kHz
1.2 MHz
600 kHz
1.2 MHz
600 kHz
1.2 MHz
600 kHz
1.2 MHz
600 kHz
1.2 MHz
600 kHz
PWM
PWM
PWM / PFM
PWM / PFM
PWM
PWM
PWM / PFM
PWM / PFM
PWM
PWM
PWM / PFM
PWM / PFM
2.5 V
2.5 V
2.5 V
2.5 V
3.3 V
3.3 V
3.3 V
3.3 V
5.0 V
5.0 V
5.0 V
5.0 V
NR6028T-2R2M
LTF5022T-3R3M
NR6028T-2R2M
LTF5022T-3R3M
NR6028T-2R2M
LTF5022T-3R3M
NR6028T-2R2M
LTF5022T-3R3M
NR6028T-2R2M
LTF5022T-3R3M
NR6028T-2R2M
LTF5022T-3R3M
MCH3406
MCH3406
MCH3406
MCH3406
MCH3406
MCH3406
MCH3406
MCH3406
MCH3406
MCH3406
MCH3406
MCH3406
RB050LA-30
RB050LA-30
RB050LA-30
RB050LA-30
RB050LA-30
RB050LA-30
RB050LA-30
RB050LA-30
RB050LA-30
RB050LA-30
RB050LA-30
RB050LA-30
Table 20 Efficiency vs. Output Current Characteristics and Output Voltage vs. Output Current Characteristics for
External Parts (2 / 2)
Condition
CIN
COUT
RFB1
RFB2
CFB
CDD
1
C2012X5R1A106KT
GRM31CR71A106KA × 2
47 kΩ
15 kΩ
68 pF
0.1 µF
2
C2012X5R1A106KT
GRM31CR71A106KA × 2
47 kΩ
15 kΩ
82 pF
0.1 µF
3
C2012X5R1A106KT
GRM31CR71A106KA × 2
47 kΩ
15 kΩ
68 pF
0.1 µF
4
C2012X5R1A106KT
GRM31CR71A106KA × 2
47 kΩ
15 kΩ
82 pF
0.1 µF
5
C2012X5R1A106KT
GRM31CR71A106KA × 2
68 kΩ
15 kΩ
68 pF
0.1 µF
6
C2012X5R1A106KT
GRM31CR71A106KA × 2
68 kΩ
15 kΩ
82 pF
0.1 µF
7
C2012X5R1A106KT
GRM31CR71A106KA × 2
68 kΩ
15 kΩ
68 pF
0.1 µF
8
C2012X5R1A106KT
GRM31CR71A106KA × 2
68 kΩ
15 kΩ
82 pF
0.1 µF
9
C2012X5R1A106KT
GRM31CR71A106KA × 2
110 kΩ
15 kΩ
56 pF
0.1 µF
10
C2012X5R1A106KT
GRM31CR71A106KA × 2
110 kΩ
15 kΩ
68 pF
0.1 µF
11
C2012X5R1A106KT
GRM31CR71A106KA × 2
110 kΩ
15 kΩ
56 pF
0.1 µF
12
C2012X5R1A106KT
GRM31CR71A106KA × 2
110 kΩ
15 kΩ
68 pF
0.1 µF
44
Seiko Instruments Inc.
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
The properties of the external parts are shown below.
Table 21
Part
Part Name
NR6028T-2R2M
Inductor
LTF5022T-3R3M
Diode
RB050LA-30
Transistor
MCH3406
C2012X5R1A106KT
Capacitor
C1005X7R1C104KT
GRM31CR71A106KA
* 1. DCR :
* 2. IMAX :
* 3. VF :
* 4. IF :
* 5. VR :
* 6. VDSS :
* 7. VGSS :
* 8. ID :
* 9. QG :
*10. RDS(ON ):
*11. VGS :
*12. EDC :
Characteristics of External Parts
Manfuacturer
Characteristics
2.2 µH, DCR*1 = 0.020 Ω, IMAX*2 = 4.2 A,
Taiyo Yuden Co., Ltd.
L × W × H = 6.0 × 6.0 × 2.8 mm
3.3 µH, DCR*1 = 0.060 Ω, IMAX*2 = 2.7 A,
TDK Corporation
L × W × H = 5.0 × 5.2 × 2.2 mm
VF*3 = 0.45 V, IF*4 = 3.0 A, VR*5 = 30 V
Rohm Co., Ltd.
L × W × H = 4.7 × 2.6 × 1.05 mm
VDSS*6 = 20 V, VGSS*7 = ±10 V, ID*8 = 3.0 A,
QG*9 = 8.8 nC typ.,
Sanyo Semiconductor Co., Ltd.
RDS(ON)*10 = 0.082 Ω max. (VGS*11 = 2.5 V)
L × W × H = 2.1 × 2.0 × 0.85 mm
10 µF, EDC*12 = 10 V, X5R,
L × W × H = 2.0 × 1.25 × 1.45 mm
TDK Corporation
*12
0.1 µF, EDC = 16 V, X7R,
L × W × H = 1.0 × 0.5 × 0.55 mm
10 µF, EDC*12 = 10 V, X7R,
Murata Manufacturing, Co., Ltd.
L × W × H = 3.2 × 1.6 × 1.6 mm
DC resistance
Maximum allowable current
Forward voltage
Forward current
Reverse voltage
Drain-source voltage (during short-circuiting between the gate and source)
Gate-source voltage (during short-circuiting between the drain and source)
Drain current
Gate charge
On-resistance between the drain and source
Gate-source voltage
Rated voltage
Caution The values shown in the characteristics column of Table 21 above are based on the materials provided
by each manufacture. However, consider the characteristics of the original materials when using the
above products.
Seiko Instruments Inc.
45
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
2. Output Current (IOUT) vs. Efficiency (η) Characteristics, Output Current (IOUT) vs. Output Voltage
(VOUT) Characteristics
Following shows the actual output current (IOUT) vs. efficiency (η) and output current (IOUT) vs. output voltage (VOUT)
characteristics for conditions 1 to 12 in Table 20.
100
90
80
70
60
50
40
30
20
10
0
VIN = 1.8 V
0.1
100
90
80
70
60
50
40
30
20
10
0
1000
10000
1
1
10
100
IOUT [mA]
1000
10000
10
100
IOUT [mA]
1000
2.60
2.55
2.50
2.45
2.40
2.35
2.30
2.25
2.20
2.15
2.10
2.05
2.00
10000
1000
10000
1000
10000
1000
10000
VIN = 1.8 V
0.1
1
10
100
IOUT [mA]
S-8366AABBA (VOUT(S) = 2.5 V)
100
90
80
70
60
50
40
30
20
10
0
VIN = 1.8 V
0.1
Condition 4
VIN = 1.8 V
0.1
VOUT [V]
VIN = 1.8 V
Condition 3
η [%]
10
100
IOUT [mA]
2.60
2.55
2.50
2.45
2.40
2.35
2.30
2.25
2.20
2.15
2.10
2.05
2.00
S-8365ABBBA (VOUT(S) = 2.5 V)
0.1
η [%]
1
1
10
100
IOUT [mA]
VOUT [V]
η [%]
Condition 2
1000
2.60
2.55
2.50
2.45
2.40
2.35
2.30
2.25
2.20
2.15
2.10
2.05
2.00
10000
VIN = 1.8 V
0.1
1
10
100
IOUT [mA]
S-8366ABBBA (VOUT(S) = 2.5 V)
100
90
80
70
60
50
40
30
20
10
0
VIN = 1.8 V
0.1
46
VOUT [V]
S-8365AABBA (VOUT(S) = 2.5 V)
1
10
100
IOUT [mA]
VOUT [V]
η [%]
Condition 1
1000
2.60
2.55
2.50
2.45
2.40
2.35
2.30
2.25
2.20
2.15
2.10
2.05
2.00
10000
Seiko Instruments Inc.
VIN = 1.8 V
0.1
1
10
100
IOUT [mA]
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
100
90
80
70
60
50
40
30
20
10
0
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
0.1
10
100
IOUT [mA]
1000
10000
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
1
1
10
100
IOUT [mA]
1000
10000
10
100
IOUT [mA]
1000
3.5
3.4
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
10000
1000
10000
1000
10000
1000
10000
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
0.1
1
10
100
IOUT [mA]
S-8366AABBA (VOUT(S) = 3.3 V)
100
90
80
70
60
50
40
30
20
10
0
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
0.1
Condition 8
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
0.1
VOUT [V]
100
90
80
70
60
50
40
30
20
10
0
Condition 7
3.5
3.4
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
S-8365ABBBA (VOUT(S) = 3.3 V)
0.1
η [%]
1
VOUT [V]
η [%]
Condition 6
η [%]
VOUT [V]
S-8365AABBA (VOUT(S) = 3.3 V)
1
10
100
IOUT [mA]
1000
3.5
3.4
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
10000
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
0.1
1
10
100
IOUT [mA]
S-8366ABBBA (VOUT(S) = 3.3 V)
100
90
80
70
60
50
40
30
20
10
0
VOUT [V]
η [%]
Condition 5
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
0.1
1
10
100
IOUT [mA]
1000
3.5
3.4
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
10000
Seiko Instruments Inc.
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
0.1
1
10
100
IOUT [mA]
47
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
100
90
80
70
60
50
40
30
20
10
0
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
VIN = 4.2 V
10000
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
VIN = 4.2 V
Condition 11
η [%]
1000
1
10
100
IOUT [mA]
1000
1
1
10
100
IOUT [mA]
1000
10000
5.2
5.1
5.0
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.2
1000
10000
1000
10000
1000
10000
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
VIN = 4.2 V
0.1
1
10
100
IOUT [mA]
10
100
IOUT [mA]
1000
5.2
5.1
5.0
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.2
10000
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
VIN = 4.2 V
0.1
1
10
100
IOUT [mA]
S-8366ABBBA (VOUT(S) = 5.0 V)
100
90
80
70
60
50
40
30
20
10
0
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
VIN = 4.2 V
0.1
0.1
10000
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
VIN = 4.2 V
Condition 12
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
VIN = 4.2 V
S-8366AABBA (VOUT(S) = 5.0 V)
100
90
80
70
60
50
40
30
20
10
0
0.1
5.2
5.1
5.0
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.2
S-8365ABBBA (VOUT(S) = 5.0 V)
100
90
80
70
60
50
40
30
20
10
0
0.1
η [%]
10
100
IOUT [mA]
VOUT [V]
η [%]
Condition 10
1
VOUT [V]
0.1
48
VOUT [V]
S-8365AABBA (VOUT(S) = 5.0 V)
1
10
100
IOUT [mA]
VOUT [V]
η [%]
Condition 9
1000
5.2
5.1
5.0
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.2
10000
Seiko Instruments Inc.
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
VIN = 4.2 V
0.1
1
10
100
IOUT [mA]
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
3. Output Current (IOUT) vs. Ripple Voltage (Vr) Characteristics
Following shows the actual output current (IOUT) vs. ripple voltage (Vr) characteristics for conditions of 1 to 12 in
Table 20.
Vr [V]
1
10
100
IOUT [mA]
1000
100
90
80
70
60
50
40
30
20
10
0
Condition 4
VIN = 1.8 V
0.1
Condition 5
1
10
100
IOUT [mA]
1000
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
0.1
Condition 7
1
10
100
IOUT [mA]
1000
100
90
80
70
60
50
40
30
20
10
0
0.1
1
10
100
IOUT [mA]
1000
1000
1
10
100
IOUT [mA]
1000
S-8365ABBBA (VOUT(S) = 3.3 V)
100
90
80
70
60
50
40
30
20
10
0
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
0.1
1
Seiko Instruments Inc.
10
100
IOUT [mA]
1000
10000
10000
S-8366ABBBA (VOUT(S) = 3.3 V)
100
90
80
70
60
50
40
30
20
10
0
10000
10000
S-8366ABBBA (VOUT(S) = 2.5 V)
Condition 6
Condition 8
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
10
100
IOUT [mA]
VIN = 1.8 V
0.1
10000
S-8366AABBA (VOUT(S) = 3.3 V)
1
100
90
80
70
60
50
40
30
20
10
0
10000
S-8365AABBA (VOUT(S) = 3.3 V)
100
90
80
70
60
50
40
30
20
10
0
VIN = 1.8 V
0.1
Vr [V]
S-8366AABBA (VOUT(S) = 2.5 V)
S-8365ABBBA (VOUT(S) = 2.5 V)
100
90
80
70
60
50
40
30
20
10
0
10000
Vr [V]
Vr [V]
Condition 3
Vr [V]
Condition 2
VIN = 1.8 V
0.1
Vr [V]
S-8365AABBA (VOUT(S) = 2.5 V)
100
90
80
70
60
50
40
30
20
10
0
Vr [V]
Vr [V]
Condition 1
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
0.1
1
10
100
IOUT [mA]
1000
10000
49
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
Condition 11
Vr [V]
Condition 10
100
90
80
70
60
50
40
30
20
10
0
1
10
100
IOUT [mA]
Vr [V]
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
VIN = 4.2 V
0.1
1000
S-8366AABBA (VOUT(S) = 5.0 V)
1
10
100
IOUT [mA]
1000
S-8365ABBBA (VOUT(S) = 5.0 V)
100
90
80
70
60
50
40
30
20
10
0
10000
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
VIN = 4.2 V
0.1
50
S-8365AABBA (VOUT(S) = 5.0 V)
100
90
80
70
60
50
40
30
20
10
0
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
VIN = 4.2 V
0.1
Condition 12
Vr [V]
Vr [V]
Condition 9
100
90
80
70
60
50
40
30
20
10
0
10000
Seiko Instruments Inc.
1
10
100
IOUT [mA]
1000
10000
S-8366ABBBA (VOUT(S) = 5.0 V)
VIN = 1.8 V
VIN = 2.4 V
VIN = 3.0 V
VIN = 4.2 V
0.1
1
10
100
IOUT [mA]
1000
10000
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
Marking Specification
(1) SNT-6A
SNT-6A
Top view
1
(1) to (3) :
(4) to (6) :
6
3
(1) (2) (3)
(4) (5) (6)
2
Product code (Refer to Product name vs. Product code)
Lot number
5
4
Product name vs. Product code
(a) S-8365 Series
(b) S-8366 Series
Product code
(1)
(2)
(3)
U
Q
A
U
Q
C
U
Q
G
U
Q
I
U
Q
K
U
Q
O
Product name
S-8365AAAAA-I6T1G2
S-8365AAABA-I6T1G2
S-8365AABBA-I6T1G2
S-8365ABAAA-I6T1G2
S-8365ABABA-I6T1G2
S-8365ABBBA-I6T1G2
Product name
S-8366AAAAA-I6T1G2
S-8366AAABA-I6T1G2
S-8366AABBA-I6T1G2
S-8366ABAAA-I6T1G2
S-8366ABABA-I6T1G2
S-8366ABBBA-I6T1G2
(1)
U
U
U
U
U
U
Product code
(2)
(3)
Q
R
Q
T
Q
X
Q
Z
Q
3
Q
7
(2) SOT-23-5
SOT-23-5
Top view
5
(1) to (3) :
(4) :
4
Product code (Refer to Product name vs. Product code)
Lot number
(1) (2) (3) (4)
1
2
3
Product name vs. Product code
(a) S-8365 Series
Product name
S-8365AAAAA-M5T1S2
S-8365AAABA-M5T1S2
S-8365ABAAA-M5T1S2
S-8365ABABA-M5T1S2
(b) S-8366 Series
Product code
(1)
(2)
(3)
U
Q
A
U
Q
C
U
Q
I
U
Q
K
Product name
S-8366AAAAA-M5T1S2
S-8366AAABA-M5T1S2
S-8366ABAAA-M5T1S2
S-8366ABABA-M5T1S2
Seiko Instruments Inc.
(1)
U
U
U
U
Product code
(2)
(3)
Q
R
Q
T
Q
Z
Q
3
51
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.1.1_00
S-8365/8366 Series
(3) SOT-23-6
SOT-23-6
Top view
6
5
4
(1) to (3) :
(4) :
Product code (Refer to Product name vs. Product code)
Lot number
(1) (2) (3) (4)
1
2
3
Product name vs. Product code
(a) S-8365 Series
Product name
S-8365AABBA-M6T1S2
S-8365ABBBA-M6T1S2
52
(b) S-8366 Series
Product code
(1)
(2)
(3)
U
Q
G
U
Q
O
Product name
S-8366AABBA-M6T1S2
S-8366ABBBA-M6T1S2
Seiko Instruments Inc.
(1)
U
U
Product code
(2)
(3)
Q
X
Q
7
1.57±0.03
6
1
5
4
2
3
+0.05
0.08 -0.02
0.5
0.48±0.02
0.2±0.05
No. PG006-A-P-SD-2.0
TITLE
SNT-6A-A-PKG Dimensions
No.
PG006-A-P-SD-2.0
SCALE
UNIT
mm
Seiko Instruments Inc.
+0.1
ø1.5 -0
4.0±0.1
2.0±0.05
0.25±0.05
+0.1
1.85±0.05
5°
ø0.5 -0
4.0±0.1
0.65±0.05
3 2 1
4
5 6
Feed direction
No. PG006-A-C-SD-1.0
TITLE
SNT-6A-A-Carrier Tape
PG006-A-C-SD-1.0
No.
SCALE
UNIT
mm
Seiko Instruments Inc.
12.5max.
9.0±0.3
Enlarged drawing in the central part
ø13±0.2
(60°)
(60°)
No. PG006-A-R-SD-1.0
TITLE
SNT-6A-A-Reel
No.
PG006-A-R-SD-1.0
SCALE
UNIT
QTY.
mm
Seiko Instruments Inc.
5,000
0.52
1.36
0.52
0.3
0.2
0.3
0.2
0.3
Caution Making the wire pattern under the package is possible. However, note that the package
may be upraised due to the thickness made by the silk screen printing and of a solder
resist on the pattern because this package does not have the standoff.
No. PG006-A-L-SD-3.0
TITLE
SNT-6A-A-Land Recommendation
PG006-A-L-SD-3.0
No.
SCALE
UNIT
mm
Seiko Instruments Inc.
2.9±0.2
1.9±0.2
4
5
1
2
+0.1
0.16 -0.06
3
0.95±0.1
0.4±0.1
No. MP005-A-P-SD-1.2
TITLE
No.
SOT235-A-PKG Dimensions
MP005-A-P-SD-1.2
SCALE
UNIT
mm
Seiko Instruments Inc.
4.0±0.1(10 pitches:40.0±0.2)
+0.1
ø1.5 -0
2.0±0.05
+0.2
ø1.0 -0
0.25±0.1
4.0±0.1
1.4±0.2
3.2±0.2
3 2 1
4
5
Feed direction
No. MP005-A-C-SD-2.1
TITLE
SOT235-A-Carrier Tape
No.
MP005-A-C-SD-2.1
SCALE
UNIT
mm
Seiko Instruments Inc.
12.5max.
9.0±0.3
Enlarged drawing in the central part
ø13±0.2
(60°)
(60°)
No. MP005-A-R-SD-1.1
SOT235-A-Reel
TITLE
No.
MP005-A-R-SD-1.1
SCALE
QTY.
UNIT
mm
Seiko Instruments Inc.
3,000
2.9±0.2
1.9±0.2
6
0.95
5
1
4
2
3
+0.1
0.15 -0.05
0.95
0.35±0.15
No. MP006-A-P-SD-1.1
TITLE
SOT236-A-PKG Dimensions
No.
MP006-A-P-SD-1.1
SCALE
UNIT
mm
Seiko Instruments Inc.
4.0±0.1(10 pitches:40.0±0.2)
+0.1
ø1.5 -0
2.0±0.05
+0.2
ø1.0 -0
0.25±0.1
4.0±0.1
1.4±0.2
3.2±0.2
3 2 1
4 5 6
Feed direction
No. MP006-A-C-SD-3.1
TITLE
SOT236-A-Carrier Tape
No.
MP006-A-C-SD-3.1
SCALE
UNIT
mm
Seiko Instruments Inc.
12.5max.
9.0±0.3
Enlarged drawing in the central part
ø13±0.2
(60°)
(60°)
No. MP006-A-R-SD-2.1
SOT236-A-Reel
TITLE
MP006-A-R-SD-2.1
No.
SCALE
UNIT
QTY
mm
Seiko Instruments Inc.
3,000
•
•
•
•
•
•
The information described herein is subject to change without notice.
Seiko Instruments Inc. is not responsible for any problems caused by circuits or diagrams described herein
whose related industrial properties, patents, or other rights belong to third parties. The application circuit
examples explain typical applications of the products, and do not guarantee the success of any specific
mass-production design.
When the products described herein are regulated products subject to the Wassenaar Arrangement or other
agreements, they may not be exported without authorization from the appropriate governmental authority.
Use of the information described herein for other purposes and/or reproduction or copying without the
express permission of Seiko Instruments Inc. is strictly prohibited.
The products described herein cannot be used as part of any device or equipment affecting the human
body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus
installed in airplanes and other vehicles, without prior written permission of Seiko Instruments Inc.
Although Seiko Instruments Inc. exerts the greatest possible effort to ensure high quality and reliability, the
failure or malfunction of semiconductor products may occur. The user of these products should therefore
give thorough consideration to safety design, including redundancy, fire-prevention measures, and
malfunction prevention, to prevent any accidents, fires, or community damage that may ensue.

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