SII S-8351A50MC

S-8351/8352 Series
www.sii-ic.com
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING
REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
© Seiko Instruments Inc., 2002-2010
The S-8351/8352 Series is a CMOS step-up switching regulator controller which mainly consists of a reference voltage
source, an oscillation circuit, a comparator and PFM control circuit. The PFM control circuit allows the duty ratio to be
automatically switched according to the load (at light load : 50%, at high output current : 75%), enabling products with a low
ripple over a wide range, high efficiency, and high output current (A, B, and D type). Products with a fixed duty ratio of 75%
are also available (C type).
The S-8351 Series can configure a step-up switching regulator with an external coil, capacitor, and diode. A protection
circuit turns off the built-in MOS FET when the voltage at the CONT pin exceeds the limit to prevent it from being damaged.
In addition to the above features, the small package and low current consumption, makes the S-8351 Series ideal for
applications such as the power supply unit of portable equipment.
The S-8352 Series, which features an external transistor, is suitable for applications requiring a high output current.
„ Features
• Low voltage operation : Startup at 0.9 V min. (IOUT = 1 mA) guaranteed
• Low current consumption : During operation 23.2 μA (VOUT = 3.3 V, typ.)
During shutdown 0.5 μA (max.)
• Duty ratio : 50 % / 75 % built-in auto-switching-type PFM control circuit (A, B, and D type)
75 % built-in fixed-type PFM control circuit (C type)
• External parts : Coil, capacitor, and diode
• Output voltage : Selectable in 0.1 V steps between 2.0 V to 6.5 V (A, B, and C type)
Selectable in 0.1 V steps between 1.5 V to 6.5 V (D type)
• Output voltage accuracy : ±2.4%
• Shutdown function (A type)
• VDD / VOUT separate type (D type)
• External transistor type available (S-8352 Series)
• Lead-free, Sn 100%, halogen-free*1
*1. Refer to “„ Product Name Structure” for details.
„ Applications
• Power supplies for portable equipment such as digital cameras, electronic notebooks, and PDAs
• Power supplies for audio equipment such as portable CD / MD players
• Constant voltage power supplies for cameras, video equipment, and communications equipment
• Power supplies for microcomputers
„ Packages
• SOT-23-3
• SOT-23-5
• SOT-89-3
Seiko Instruments Inc.
1
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
„ Block Diagrams
1.
S-8351 Series
(1)
A Type (With shutdown function)
CONT
VOUT
Protection
circuit
IC internal
power supply
VREF
PFM
control
circuit
+
−
VSS
ON / OFF
Figure 1
(2)
B and C Types (Without shutdown function, VDD / VOUT non-separate type)
CONT
VOUT
Protection
circuit
IC internal
power supply
VREF
PFM
control
circuit
+
−
VSS
Figure 2
(3)
D Type (VDD / VOUT separate type)
CONT
VDD
VOUT
IC internal power supply
Protection
circuit
VREF
PFM
control
circuit
+
−
VSS
Figure 3
2
Seiko Instruments Inc.
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
2.
S-8352 Series
(1)
A Type (With shutdown function)
VOUT
IC internal power supply
VREF
PFM
control
circuit
EXT
+
−
VSS
ON / OFF
Figure 4
(2)
B and C Type (Without Shutdown function, VDD / VOUT non-separate type)
VOUT
IC internal power supply
VREF
EXT
PFM
control
circuit
+
−
VSS
Figure 5
(3)
D Type (VDD / VOUT separate type)
VDD
VOUT
IC internal
power supply
EXT
VREF
PFM
control
circuit
+
−
VSS
Figure 6
Seiko Instruments Inc.
3
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
„ Product Name Structure
The product types, output voltage, and packages for the S-8351/8352 Series can be selected at the user’s request.
Please refer to the “3. Product Name” for the definition of the product name, “4. Package” regarding the package
drawings and “5. Product Name List” for the full product names.
1.
Function List
(1)
Built-in Power MOS FET Type
Table 1
Controll
system
Duty
ratio
[%]
Switching
frequency
[kHz]
Shutdown
function
VDD / VOUT
separate
type
Package
S-8351AxxMC
PFM
50 / 75
100
Yes
−
SOT-23-5
S-8351BxxMA
PFM
50 / 75
100
−
−
SOT-23-3
S-8351CxxMA
PFM
75
100
−
−
SOT-23-3
S-8351CxxUA
PFM
75
100
−
−
SOT-89-3
S-8351DxxMC
PFM
50 / 75
100
−
Yes
SOT-23-5
Product Name
(2)
Application
Applications requiring shutdown
function
Applications not requiring
shutdown function
Applications not requiring
shutdown function
Applications not requiring
shutdown function
Applications in which output
voltage is adjusted by external
resistor
External Power MOS FET Type
Table 2
Controll
System
Duty
Ratio
[%]
Switching
Frequency
[kHz]
Shutdown
Function
VDD / VOUT
Separate
Type
Package
S-8352AxxMC
PFM
50 / 75
100
Yes
−
SOT-23-5
S-8352BxxMA
PFM
50 / 75
100
−
−
SOT-23-3
S-8352CxxMA
PFM
75
100
−
−
SOT-23-3
S-8352CxxUA
PFM
75
100
−
−
SOT-89-3
S-8352DxxMC
PFM
50 / 75
100
−
Yes
SOT-23-5
Product Name
4
Seiko Instruments Inc.
Application
Applications requiring shutdown
function
Applications not requiring
shutdown function
Applications not requiring
shutdown function
Applications not requiring
shutdown function
Applications in which output
voltage is adjusted by external
resistor
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
2.
Package and Function List by Product Type
Table 3
Series Name
A (Duty ratio 50% / 75% auto-switching type)
A = 100 kHz
B (Duty ratio 50% / 75% auto-switching type)
B = 100 kHz
C (Duty ratio 75% fixed type)
C = 100 kHz
D (Duty ratio 50% / 75% auto-switching type)
D = 100 kHz
S-8351 Series,
S-8352 Series
3.
Package Name Shutdown Function VDD / VOUT Separate Type
(Abbreviation)
Yes / No
Yes / No
Type
MC
Yes
No
MA
No
No
MA / UA
No
No
MC
No
Yes
Product Name
(1)
SOT-23-3
S-835 x
x
xx
MA - xxx
T2
G
Environmental code
G : Lead-free (for details, please contact our sales office)
IC direction in tape specifications *1
Product name (abbreviation) *2
Package name (abbreviation)
MA : SOT-23-3
Output voltage
15 to 65
(e.g. When the output voltage is 1.5 V, it is expressed as 15.)
Product type
A : With shutdown function,
B : 50% / 75% automatic duty ratio switching type,
C : 75% duty ratio fixed type,
D : VDD / VOUT separate type,
fOSC = 100 kHz
fOSC = 100 kHz
fOSC = 100 kHz
fOSC = 100 kHz
Series name
1 : Built-in power MOS FET
2 : External power MOS FET
*1. Refer to the tape specifications.
*2. Refer to the Table 4, 5 in the “5.
Product Name List”.
Seiko Instruments Inc.
5
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
(2)
SOT-23-5, SOT-89-3
S-835 x
x
xx
xx - xxx
T2
x
Environmental code
U : Lead-free (Sn 100%), halogen-free
G : Lead-free (for details, please contact our sales office)
IC direction in tape specifications
*1
Product name (abbreviation) *2
Package name (abbreviation)
MC : SOT-23-5
UA : SOT-89-3
Output voltage
15 to 65
(e.g. When the output voltage is 1.5 V, it is expressed as 15.)
Product type
A : With shutdown function,
B : 50% / 75% automatic duty ratio switching type,
C : 75% duty ratio fixed type,
D : VDD / VOUT separate type,
fOSC = 100 kHz
fOSC = 100 kHz
fOSC = 100 kHz
fOSC = 100 kHz
Series name
1 : Built-in power MOS FET
2 : External power MOS FET
*1. Refer to the tape specifications.
*2. Refer to the Table 4, 5 in the “5.
4.
Package
Package Name
SOT-23-3
SOT-23-5
SOT-89-3
6
Product Name List”.
Package
Drawing Code
Tape
Reel
MP003-A-P-SD
MP005-A-P-SD
UP003-A-P-SD
MP003-A-C-SD
MP005-A-C-SD
UP003-A-C-SD
MP003-A-R-SD
MP005-A-R-SD
UP003-A-R-SD
Seiko Instruments Inc.
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
5.
Product Name List
(1)
S-8351 Series
Table 4
Output
voltage
S-8351AxxMC
Series
S-8351BxxMA
Series
S-8351CxxMA
Series
S-8351CxxUA
Series
S-8351DxxMC
Series
1.5 V
2.0 V
2.2 V
2.5 V
2.6 V
2.7 V
2.8 V
3.0 V
3.1 V
3.2 V
3.3 V
3.5 V
4.0 V
4.5 V
4.6 V
4.7 V
5.0 V
5.5 V
5.6 V
6.0 V
−
S-8351A20MC-J2FT2x
S-8351A22MC-J2HT2x
S-8351A25MC-J2KT2x
S-8351A26MC-J2LT2x
S-8351A27MC-J2MT2x
S-8351A28MC-J2NT2x
S-8351A30MC-J2PT2x
−
S-8351A32MC-J2RT2x
S-8351A33MC-J2ST2x
S-8351A35MC-J2UT2x
S-8351A40MC-J2ZT2x
S-8351A45MC-J3ET2x
−
S-8351A47MC-J3GT2x
S-8351A50MC-J3JT2x
S-8351A55MC-J3OT2x
S-8351A56MC-J3PT2x
S-8351A60MC-J3TT2x
−
S-8351B20MA-J4FT2G
−
S-8351B25MA-J4KT2G
−
S-8351B27MA-J4MT2G
−
S-8351B30MA-J4PT2G
−
−
S-8351B33MA-J4ST2G
−
−
S-8351B45MA-J5ET2G
S-8351B46MA-J5FT2G
−
S-8351B50MA-J5JT2G
S-8351B55MA-J5OT2G
−
−
−
−
−
−
−
−
−
−
−
−
S-8351C33MA-J6ST2G
−
−
−
−
−
−
−
−
−
−
−
−
S-8351C25UA-J6KT2x
−
−
−
S-8351C30UA-J6PT2x
S-8351C31UA-J6QT2x
S-8351C32UA-J6RT2x
S-8351C33UA-J6ST2x
S-8351C35UA-J6UT2x
−
−
−
−
S-8351C50UA-J7JT2x
−
−
−
S-8351D15MC-J8AT2x
S-8351D20MC-J8FT2x
−
−
−
−
−
S-8351D30MC-J8PT2x
−
−
−
−
S-8351D40MC-J8ZT2x
−
−
−
S-8351D50MC-J9JT2x
−
−
S-8351D60MC-J9TT2x
(2)
S-8352 Series
Table 5
Output
voltage
S-8352AxxMC
Series
S-8352BxxMA
Series
S-8352CxxUA
Series
S-8352DxxMC
Series
2.0 V
2.5 V
3.0 V
3.1 V
3.2 V
3.3 V
3.5 V
3.7 V
4.0 V
4.6 V
4.7 V
5.0 V
5.4 V
5.6 V
−
S-8352A25MC-K2KT2x
S-8352A30MC-K2PT2x
−
S-8352A32MC-K2RT2x
S-8352A33MC-K2ST2x
S-8352A35MC-K2UT2x
S-8352A37MC-K2WT2x
S-8352A40MC-K2ZT2x
S-8352A46MC-K3FT2x
S-8352A47MC-K3GT2x
S-8352A50MC-K3JT2x
S-8352A54MC-K3NT2x
−
−
−
S-8352B30MA-K4PT2G
−
−
−
−
−
−
−
−
S-8352B50MA-K5JT2G
−
−
−
−
S-8352C30UA-K6PT2x
S-8352C31UA-K6QT2x
S-8352C32UA-K6RT2x
S-8352C33UA-K6ST2x
−
−
−
−
−
S-8352C50UA-K7JT2x
−
S-8352C56UA-K7PT2x
S-8352D20MC-K8FT2x
−
S-8352D30MC-K8PT2x
−
−
S-8352D33MC-K8ST2x
−
−
−
−
−
−
−
−
Remark 1. Please contact the SII marketing department for products with an output voltage other than those specified above.
2. x: G or U
3. Please select products of environmental code = U for Sn 100%, halogen-free products.
Seiko Instruments Inc.
7
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
„ Pin Configurations
Table 6 S-8351 Series B and C Types
(Without shutdown function, VDD / VOUT non-separate type)
SOT-23-3
Top view
1
2
Pin No.
Symbol
Pin Description
1
2
3
VOUT
VSS
CONT
Output voltage pin and IC power supply pin
GND pin
External inductor connection pin (Open-drain output)
Table 7 S-8352 Series B and C Types
(Without shutdown function, VDD / VOUT non-separate type)
3
Pin No.
1
2
3
Figure 7
Top view
4
Pin No.
2
Figure 8
3
Symbol
Pin Description
Shutdown pin
“H”: Normal operation (Step-up operating)
“L”: Step-up stopped (Entire circuit stopped)
2
VOUT
Output voltage pin and IC power supply pin
NC*1
3
No connection
4
VSS
GND pin
5
CONT
External inductor connection pin (Open-drain output)
*1. The NC pin indicates electrically open.
1
1
Pin Description
Output voltage pin and IC power supply pin
GND pin
External transistor connection pin (CMOS output)
Table 8 S-8351 Series A Type
(With shutdown function, VDD / VOUT non-separate type)
SOT-23-5
5
Symbol
VOUT
VSS
EXT
ON / OFF
Table 9 S-8352 Series A Type
(With shutdown function, VDD / VOUT non-separate type)
Pin No.
Symbol
Pin Description
Shutdown pin
“H”: Normal operation (Step-up operating)
“L”: Step-up stopped (Entire circuit stopped)
2
VOUT
Output voltage pin and IC power supply pin
NC*1
3
No connection
4
VSS
GND pin
5
EXT
External transistor connection pin (CMOS output)
*1. The NC pin indicates electrically open.
1
8
ON / OFF
Seiko Instruments Inc.
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
Table 10 S-8351 Series D Type
(Without shutdown function, VDD / VOUT separate type)
Pin No.
Symbol
Pin Description
1
VOUT
Output voltage pin
2
VDD
IC power supply pin
NC*1
3
No connection
4
VSS
GND pin
5
CONT
External inductor connection pin (Open-drain output)
*1. The NC pin indicates electrically open.
Table 11 S-8352 Series D Type
(Without shutdown function, VDD / VOUT separate type)
Pin No.
Symbol
Pin Description
1
VOUT
Output voltage pin
2
VDD
IC power supply pin
NC*1
3
No connection
4
VSS
GND pin
5
EXT
External transistor connection pin (CMOS output)
*1. The NC pin indicates electrically open.
Table 12 S-8351 Series C Type
(Without shutdown function, VDD / VOUT non-separate type)
SOT-89-3
Top view
1
2
Pin No.
Symbol
Pin Description
1
2
3
VSS
VOUT
CONT
GND pin
Output voltage pin and IC power supply pin
External inductor connection pin (Open-drain output)
3
Figure 9
Table 13 S-8352 Series C Type
(Without shutdown function, VDD / VOUT non-separate type)
Pin No.
Symbol
1
2
3
VSS
VOUT
EXT
Pin Description
GND pin
Output voltage pin and IC power supply pin
External transistor connection pin (CMOS output)
Seiko Instruments Inc.
9
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
„ Absolute Maximum Ratings
Table 14
Item
VOUT pin voltage
ON / OFF pin voltage
VOUT
VON / OFF
*1
*2
VDD pin voltage
CONT pin voltage
EXT pin voltage
(Ta = 25°C unless otherwise specified)
Absolute maximum rating
Unit
VSS − 0.3 to VSS + 12
V
Symbol
VDD
VCONT
D type
Others
VEXT
CONT pin current
EXT pin current
ICONT
IEXT
SOT-23-3
Power dissipation
SOT-23-5
PD
SOT-89-3
Operating ambient temperature
Topr
Storage temperature
Tstg
*1. With shutdown function
*2. For VDD / VOUT separate type
*3. When mounted on board
[Mounted board]
(1) Board size : 114.3 mm × 76.2 mm × t1.6 mm
(2) Board name : JEDEC STANDARD51-7
VSS − 0.3 to VSS + 12
V
VSS − 0.3 to VSS + 12
VSS − 0.3 to VSS + 12
VSS − 0.3 to VDD + 0.3
VSS − 0.3 to VOUT + 0.3
300
±50
150 (When not mounted on board)
430*3
250 (When not mounted on board)
600*3
500 (When not mounted on board)
1000*3
− 40 to + 85
− 40 to + 125
V
V
V
V
mA
mA
mW
mW
mW
mW
mW
mW
°C
°C
Caution 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.
(1)
When mounted on board
(2)
When not mounted on board
600
Power dissipation (PD) [mW]
Power dissipation (PD) [mW]
1200
1000
SOT-89-3
800
SOT-23-5
600
SOT-23-3
400
200
500
SOT-23-5
300
SOT-23-3
200
100
0
0
0
50
100
150
Ambient temperature (Ta) [°C]
Figure 10
10
SOT-89-3
400
0
50
150
Ambient temperature (Ta) [°C]
Power Dissipation of Packages
Seiko Instruments Inc.
100
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
„ Electrical Characteristics
(1)
S-8351 Series
Table 15 (1 / 2)
Item
Symbol
Condition
Output voltage
VOUT
−
Input voltage
Operation start voltage
VIN
VST1
Oscillation start voltage
VST2
Input current during no- load
IIN
Current consumption 1
ISS1
Current consumption 2
ISS2
−
IOUT = 1 mA
No external parts, Voltage applied to VOUT,
CONT pin pulled up to VOUT with 300 Ω
resistor
S-8351x15 to 29
IOUT = 0 mA
S-8351x30 to 49
S-8351x50 to 65
S-8351x15 to 19
S-8351x20 to 29
S-8351x30 to 39
VOUT = VOUT(S) × 0.95
S-8351x40 to 49
S-8351x50 to 59
S-8351x60 to 65
S-8351x15 to 19
S-8351x20 to 29
S-8351x30 to 39
VOUT = VOUT(S) + 0.5 V
S-8351x40 to 49
S-8351x50 to 59
S-8351x60 to 65
Current consumption during
shutdown
(With shutdown function)
ISSS
Switching current
ISW
Switching transistor leakage
current
ISWQ
CONT pin limit voltage
Line regulation
Load regulation
Output voltage temperature
coefficient
VCONTLMT
ΔVOUT1
ΔVOUT2
ΔVOUT
ΔTa • VOUT
Oscillation frequency
fOSC
Duty ratio 1
Duty1
Duty ratio 2
(For A, B, D type)
Duty2
(Ta = 25°C unless otherwise specified)
Measurement
Min.
Typ.
Max.
Unit
circuit
VOUT(S) VOUT(S) VOUT(S)
V
1
× 0.976
× 1.024
−
−
10
V
1
−
−
0.9
V
1
−
−
0.8
V
2
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
8.5
9.0
9.5
9.6
15.7
23.2
32.0
42.1
54.9
2.3
2.5
2.7
2.9
3.1
3.3
−
−
−
16.0
26.2
38.6
53.3
70.2
91.5
3.5
3.8
4.1
4.4
4.7
5.1
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
1
1
1
2
2
2
2
2
2
2
2
2
2
2
2
−
−
0.5
μA
2
S-8351x15 to 19
S-8351x20 to 24
S-8351x25 to 29
VCONT = 0.4 V
S-8351x30 to 39
S-8351x40 to 49
S-8351x50 to 59
S-8351x60 to 65
No external parts, VCONT = VOUT = 10 V,
VON / OFF = 0 V
50.2
65.0
78.5
90.7
110.9
125.7
135.2
91.2
118.2
142.7
164.8
201.6
228.6
245.8
−
−
−
−
−
−
−
mA
mA
mA
mA
mA
mA
mA
2
2
2
2
2
2
2
−
−
0.5
μA
2
Apply to CONT pin, Confirm oscillation stop
VIN = VOUT(S) × 0.4 to × 0.6
IOUT = 10 μA to VOUT(S) / 250 × 1.25
−
−
−
0.9
30
30
−
60
60
V
mV
mV
2
1
1
Ta = − 40°C to + 85°C
−
±50
−
ppm / °C
1
90
100
110
kHz
2
70
75
80
%
2
−
50
−
%
1
VON / OFF = 0 V
VOUT = VOUT(S) × 0.95,
Measured waveform at CONT pin
VOUT = VOUT(S) × 0.95,
Measured waveform at CONT pin
Measured waveform at CONT pin at light load
Seiko Instruments Inc.
11
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
Table 15 (2 / 2)
Item
Symbol
ISH
ISL
VON / OFF = 0 V
VSL1
VSL2
ON / OFF pin input current
(With shutdown function)
Efficiency
Condition
VOUT = VOUT(S) × 0.95,
Measured oscillation at CONT pin
VOUT = VOUT(S) × 0.95,
At VOUT≥1.5 V
Judged oscillation stop at
At VOUT<1.5 V
CONT pin
VON / OFF = 10 V
VSH
ON / OFF pin input voltage
(With shutdown function)
(Ta = 25°C unless otherwise specified)
Measurement
Min.
Typ.
Max.
Unit
circuit
EFFI
−
0.75
−
−
V
2
−
−
0.3
V
2
−
−
0.2
V
2
− 0.1
−
0.1
μA
2
− 0.1
−
0.1
μA
2
−
−
86
88
−
−
%
%
1
1
S-8351x30
S-8351x50
External parts
Coil:
CDRH6D28-101 (100 μH) of Sumida Corporation
Diode:
MA2Z748 (Shottky type) of Matsushita Electric Industrial Co., Ltd.
Capacitor: F93 (16 V, 47 μF tantalum type) of Nichicon Corporation
VIN = VOUT(S) × 0.6 applied, IOUT = VOUT(S) / 250 Ω
ON / OFF pin is connected to VOUT
With shutdown function :
For VDD / VOUT separate type : VDD pin is connected to VOUT pin
Remark 1.
2.
12
VOUT(S) specified above is the set output voltage value, and VOUT is the typical value of the actual output
voltage.
VDD / VOUT separate type
A step-up operation is performed from VDD = 0.8 V. However, 1.8 V≤VDD<10 V is recommended stabilizing
the output voltage and oscillation frequency. (VDD≥1.8 V must be applied for products with a set value of less
than 1.9 V.)
Seiko Instruments Inc.
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
(2)
S-8352 Series
Table 16 (1 / 2)
Item
Symbol
Condition
Output voltage
VOUT
−
Input voltage
Operation start voltage
Oscillation start voltage
VIN
VST1
VST2
Current consumption 1
ISS1
Current consumption 2
ISS2
−
IOUT = 1 mA
No external parts, Voltage applied to VOUT
S-8352x15 to 19
S-8352x20 to 29
S-8352x30 to 39
VOUT = VOUT(S) × 0.95
S-8352x40 to 49
S-8352x50 to 59
S-8352x60 to 65
S-8352x15 to 19
S-8352x20 to 29
S-8352x30 to 39
VOUT = VOUT(S) + 0.5 V
S-8352x40 to 49
S-8352x50 to 59
S-8352x60 to 65
Current consumption during
shutdown
(With shutdown function)
ISSS
VON / OFF = 0 V
S-8352x15 to 19
S-8352x20 to 24
S-8352x25 to 29
S-8352x30 to 39
S-8352x40 to 49
S-8352x50 to 59
S-8352x60 to 65
S-8352x15 to 19
S-8352x20 to 24
S-8352x25 to 29
S-8352x30 to 39
S-8352x40 to 49
S-8352x50 to 59
S-8352x60 to 65
IEXTH
VEXT = VOUT − 0.4 V
IEXTL
VEXT = − 0.4 V
Line regulation
Load regulation
Output voltage temperature
coefficient
ΔVOUT1
ΔVOUT2
ΔVOUT
ΔTa • VOUT
VIN = VOUT(S) × 0.4 to × 0.6
IOUT = 10 μA to VOUT(S) / 100 × 1.25
Oscillation frequency
fOSC
Duty ratio 1
Duty1
Duty ratio 2
(For A, B, D type)
Duty2
EXT pin output current
Ta = − 40°C to + 85°C
VOUT = VOUT(S) × 0.95,
Measured waveform at EXT pin
VOUT = VOUT(S) × 0.95,
Measured waveform at EXT
Measured waveform at EXT pin at light load
Seiko Instruments Inc.
(Ta = 25°C unless otherwise specified)
Measurement
Min.
Typ.
Max.
Unit
circuit
VOUT(S) VOUT(S) VOUT(S)
V
3
× 0.976
× 1.024
−
−
10
V
3
−
−
0.9
V
3
−
−
0.8
V
4
−
7.4
12.3
μA
4
−
12.0
20.0
μA
4
−
17.8
29.6
μA
4
−
24.7
41.1
μA
4
−
32.7
54.5
μA
4
−
43.0
71.6
μA
4
−
2.3
3.5
μA
4
−
2.5
3.8
μA
4
−
2.7
4.1
μA
4
−
2.9
4.4
μA
4
−
3.1
4.7
μA
4
−
3.3
5.1
μA
4
−
−
0.5
μA
4
− 3.5
− 5.2
− 6.8
− 8.2
− 10.7
− 12.5
− 13.9
3.8
5.6
7.3
8.9
11.6
13.7
15.3
−
−
− 6.3
− 9.4
− 12.3
− 14.9
− 19.4
− 22.8
− 25.2
6.9
10.2
13.3
16.2
21.1
25.0
27.8
30
30
−
−
−
−
−
−
−
−
−
−
−
−
−
−
60
60
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mV
mV
4
4
4
4
4
4
4
4
4
4
4
4
4
4
3
3
−
±50
−
ppm / °C
3
90
100
110
kHz
4
70
75
80
%
4
−
50
−
%
3
13
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
Table 16 (2 / 2)
Item
Symbol
ISH
ISL
VON / OFF = 0 V
VSL1
VSL2
ON / OFF pin input current
(With shutdown function)
Efficiency
Condition
VOUT = VOUT(S) × 0.95,
Measured oscillation at EXT
VOUT = VOUT(S) × 0.95,
At VOUT≥1.5 V
Judged oscillation stop at
At VOUT<1.5 V
EXT pin
VON / OFF = 10 V
VSH
ON / OFF pin input voltage
(With shutdown function)
(Ta = 25°C unless otherwise specified)
Measurement
Min.
Typ.
Max.
Unit
circuit
EFFI
−
S-8352x30
S-8352x50
0.75
−
−
V
4
−
−
0.3
V
4
−
−
0.2
V
4
− 0.1
−
0.1
μA
4
− 0.1
−
0.1
μA
4
−
−
83
85
−
−
%
%
3
3
External parts
Coil:
CDRH6D28-101 (100 μH) from Sumida Corporation
Diode:
MA2Z748 (Shottky type) from Matsushita Electric Industrial Co., Ltd.
Capacitor:
F93 (16 V, 47 μF tantalum type) from Nichicon Corporation
Transistor:
CPH3210 from Sanyo Electric Co., Ltd.
Base resistor (Rb):
1 kΩ
Base capacitor (Cb):
2200 pH (ceramic type)
VIN = VOUT(S) × 0.6 applied, IOUT = VOUT(S) / 100 Ω
ON / OFF pin is connected to VOUT
With shutdown function :
For VDD / VOUT separate type : VDD pin is connected to VOUT pin
Remark 1.
2.
14
VOUT(S) specified above is the set output voltage value, and VOUT is the typical value of the actual output
voltage.
VDD / VOUT separate type
A step-up operation is performed from VDD = 0.8 V. However, 1.8 V≤VDD<10 V is recommended stabilizing
the output voltage and oscillation frequency. (VDD≥1.8 V must be applied for products with a set value of less
than 1.9 V.)
Seiko Instruments Inc.
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
„ Measurement Circuits
1.
+
CONT
+
VOUT
*1
VDD
−
ON / OFF
VSS
−
V
+
V
*2
Figure 11
Oscilloscope
300 Ω
2.
CONT
ON / OFF
VOUT
*2
A
+
*1
VSS VDD
−
Figure 12
3.
CD
+
Rb
−
EXT
VOUT
VDD*1
*2
ON / OFF
VSS
−
Figure 13
Oscilooscope
4.
EXT
ON / OFF
*2
VSS
VOUT
VDD
*1
+
A
−
Figure 14
*1. For VDD / VOUT separate type
*2. With shutdown function
Seiko Instruments Inc.
15
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
„ Operation
1.
Step-up DC-DC Converter
The S-8351/8352 Series is a DC-DC converter that uses a pulse frequency modulation method (PFM) and features
low current consumption. This series is an especially efficient DC-DC converter at an output current of 100 μA or
lower.
In conventional fixed-duty PFM DC-DC converters, although a low duty ratio allows a lower ripple voltage when the
current load is light, the efficiency is decreased when the output load current is large. Conversely, a high duty ratio
increases the output load current and efficiency, but increases the ripple voltage when the output load current is low.
In the A, B, and D types, the duty ratio is automatically switched 75% when the output load current is high to secure
the load drive capability and 50% when the output load current is low to control the load drive capability to decrease
pulse skipping. This suppresses a drop in the ripple frequency, enabling control of the increase in the ripple voltage.
The C type adopts a 75% fixed-duty PFM method. The ripple voltage increases more than that of the duty switching
type with the load is low, but the efficiency is better.
In the A, B, and D types, the duty ratio is not rapidly changed, but rather smoothly switched in the intermediate area
between 50% and 75%. Therefore, fluctuation of the ripple voltage caused by duty switching is minimized. Figures
15, 16 show the ripple voltage characteristics versus the output current.
S-8351A30MC
S-8351A50MC
Ta = 25°C
Ta = 25°C
140
100
90
80
70
60
50
40
30
20
10
0
120
Vrp-p [mV]
Vrp-p [mV]
100
80
60
40
VIN = 1.5 V
VIN = 2 V
20
VIN = 2 V
VIN = 3 V
0
0
20
40
60
IOUT [mA]
80
0 20 40 60 80 100 120 140 160 180
IOUT [mA]
100
Figure 15 Output Current (IOUT) vs. Ripple Voltage (Vrp-p)
Characteristics
Figure 16 Output Current (IOUT) vs. Ripple Voltage (Vrp-p)
Characteristics
These figures show that the ripple voltage decreases as the output load current (IOUT) changes from large to small.
The ripple voltage becomes particularly small when IOUT is in the coil current discontinuous region of 20 mA or less.
16
Seiko Instruments Inc.
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
2.
ON/OFF Pin (Shutdown Pin) (A Type)
ON / OFF pin stops or starts step-up operation.
Setting the ON / OFF pin to the “L” level stops operation of all the internal circuits and reduces the current
consumption significantly.
DO NOT use the ON / OFF pin in a floating state because it has the structure shown in Figure 17 and is not pulled
up or pulled down internally. 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 shutdown pin is not used, connect it to the VOUT
pin.
The ON / OFF pin does not have hysteresis.
Table 17
ON / OFF pin
CR oscillation circuit
Output voltage
“H”
Operation
Fixed
≅VIN*1
“L”
Stop
*1. Voltage obtained by subtracting the voltage drop due to the DC resistance of the inductor and the diode forward
voltage from VIN.
VOUT
ON / OFF
VSS
Figure 17
ON/ OFF Pin Structure
Seiko Instruments Inc.
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STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
3.
Operation
The following are the basic equations [(1) through (7)] of the step-up switching regulator. (Refer to Figure 18.)
L
Di
VIN
+
− CL
ON / OFF
CONT
OSC
Figure 18
VOUT
M1
+
−
Step-Up Switching Regulator Circuit for Basic Equation
Voltage at CONT pin at the moment M1 is turned ON (VA) *1 :
VA = VS *2
(1)
*1. Current flowing through L (IL) is zero.
*2. Non-saturated voltage of M1.
The change in IL over time :
dIL VL VIN − VS
=
=
dt
L
L
(2)
Integration of equation (2) (IL) :
⎛ V − VS ⎞
IL = ⎜ IN
⎟•t
L
⎝
⎠
IL flows while M1 is ON (tON).
(3)
The time of tON is determined by the oscillation frequency of OSC.
The peak current (IPK) after tON :
⎛ V − VS ⎞
IPK = ⎜ IN
⎟ • t ON
L
⎝
⎠
(4)
The energy stored in L is represented by 1/2 • L (IPK)2.
When M1 is turned OFF (tOFF), the energy stored in L is emitted through a diode to the output capacitor.
Then, the reverse voltage (VL) is generated :
VL = (VOUT + VD*1) − VIN
*1. Diode forward voltage
(5)
The voltage at CONT pin rises only by VOUT+VD.
The change in the current (IL) flowing through the diode into VOUT during tOFF :
dIL VL VOUT + VD − VIN
=
=
dt
L
L
18
Seiko Instruments Inc.
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Integration of the equation (6) is as follows :
+ VD − VIN ⎞
⎛V
IL = IPK − ⎜ OUT
⎟•t
L
⎝
⎠
(7)
During tON, the energy is stored in L and is not transmitted to VOUT. When receiving the output current (IOUT) from
VOUT, the energy of the capacitor (CL) is consumed. As a result, the pin voltage of CL is reduced, and goes to the
lowest level after M1 is turned ON (tON). When M1 is turned OFF, the energy stored in L is transmitted through the
diode to CL, and the voltage of CL rises rapidly. VOUT is a time function, and therefore indicates the maximum value
(ripple voltage (VP−P) ) when the current flowing through into VOUT and load current (IOUT) match.
Next, the ripple voltage is determined as follows.
IOUT vs. t1 (time) from when M1 is turned OFF (after tON) to when VOUT reaches the maximum level :
+ VD − VIN ⎞
⎛V
IOUT = IPK − ⎜ OUT
⎟ • t1
L
⎝
⎠
⎛
⎞
L
⎟
∴ t1 = (IPK − IOUT ) • ⎜⎜
⎟
+
−
V
V
V
D
IN ⎠
⎝ OUT
(8)
(9)
When M1 is turned OFF (tOFF), IL = 0 (when the energy of the inductor is completely transmitted). Based on equation (7) :
⎛
⎞ t OFF
L
⎜
⎟=
(10)
⎜V
⎟
⎝ OUT + VD − VIN ⎠ IPK
When substituting equation (10) for equation (9) :
⎛I
⎞
t1 = t OFF − ⎜⎜ OUT ⎟⎟ • t OFF
I
⎝ PK ⎠
Electric charge ΔQ1 which is charged in CL during t1 :
t1
t1
t1
V
+ VD − VIN
V
+ VD − VIN 1 2
ΔQ1 = ∫ IL dt = IPK • ∫ dt − OUT
• ∫ tdt = IPK • t1 − OUT
• t1
0
0
0
L
L
2
When substituting equation (12) for equation (9) :
1
I +I
ΔQ1 = IPK − (IPK − IOUT ) • t1 = PK OUT • t1
2
2
A rise in voltage (VP−P) due to ΔQ 1 :
ΔQ1
1 ⎛ IPK + IOUT ⎞
VP −P =
=
•⎜
⎟ • t1
CL
CL ⎝
2
⎠
(11)
(12)
(13)
(14)
When taking into consideration IOUT to be consumed during t1 and the Equivalent Series Resistance (RESR) of CL :
ΔQ1
•t
I
1 ⎛ IPK + IOUT ⎞
⎛I +I
⎞
=
•⎜
(15)
VP −P =
⎟ • t1 + ⎜ PK OUT ⎟ • RESR − OUT 1
CL
2
2
CL
CL ⎝
⎠
⎝
⎠
When substituting equation (11) for equation (15) :
(I − I
)2 t
⎛I +I
⎞
VP −P = PK OUT • OFF + ⎜ PK OUT ⎟ • RESR
2IPK
CL ⎝
2
⎠
(16)
Therefore to reduce the ripple voltage, it is important that the capacitor connected to the output pin has a large
capacity and a small RESR.
Seiko Instruments Inc.
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STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
„ External Parts Selection
1.
Inductor
To minimize the loss due to inductor direct current resistance, select an inductor with the smallest possible direct
current resistance (less than 1 Ω). Set the inductance value (L value) to around 22 μH to 1 mH.
To make the average value of the output voltage (VOUT) constant, it is necessary to supply the energy corresponding
to the output current (IOUT) from the inductor. The amount of charge required for IOUT is IOUT × (tON + tOFF). Because
the inductor can supply energy only during tOFF, the charge is obtained by integrating equation (7) in the “3.
I
Operation” in the “„ Operation” with 0 → tOFF, namely, PK • t OFF . Thus,
2
IPK
(17)
• t OFF = IOUT × ( t ON + t OFF )
2
t +t
∴ IPK = 2 • ON OFF • IOUT
(18)
t OFF
When the oscillation duty ratio of OSC is 75%, IPK = 8 • IOUT. Therefore, an IPK current which is eight times IOUT flows
into transistor (M1).
The S-8351 Series includes a switching current controller which monitors the current flowing into the CONT pin by
the voltage (CONT control voltage) and controls the current. This controller prevents destruction of the IC due to
excess current.
If an inductor with a large L value is selected, both IPK and IOUT decrease. Since the energy stored in the inductor is
1
equal to
L • (IPK )2 , the energy decreases because IPK decreases in steps of squares offsetting the increase of L
2
value. As a result, stepping up at a low voltage becomes difficult and the minimum operating input voltage becomes
high. However, the direct current resistance loss of L value and the M1 transistor decreases by the amount IPK
decreased, and the inductance efficiency improves.
On the other hand, if an inductor with a smaller L value is selected, both IPK and IOUT increase. Accordingly, the
minimum operating input voltage becomes low but the inductance efficiency deteriorates.
Caution
An excessively large IPK may cause magnetic saturation for some core materials, leading to the
destruction of the IC. Use a core with material that satisfies Isat *1 > IPK
*1. Level of current that causes magnetic saturation.
2.
Diode
Use an external diode that meets the following requirements :
• Low forward voltage : VF < 0.3 V
• High switching speed : 500 ns max.
• Reverse voltage :
VOUT + VF or more
• Current rate :
IPK or more
20
Seiko Instruments Inc.
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
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3.
Capacitor (CIN, CL)
A capacitor on the input side (CIN) improves the efficiency by reducing the power impedance and stabilizing the input
current. Select a CIN value according to the impedance of the power supply used.
A capacitor on the output side (CL) is used for smoothing the output voltage. For step-up types, the output voltage
flows intermittently to the load current, so step-up types need a larger capacitance than step-down types. Therefore,
select an appropriate capacitor in accordance with the ripple voltage, which increases in case of a higher output
voltage or a higher load current. The capacitor value should be 10 μF or more.
A capacitor at the output side (CL) is used for smoothing the ripple voltage. Select an appropriate capacitor with a
small equivalent series resistance (RESR) and a large capacitance. The capacitor value should be 10 μF or mpre. A
tantalum electrolytic capacitor and an organic semiconductor capacitor are especially recommended because of their
superior low-temperature and leakage current characteristics.
4.
External Transistor (S-8352 Series)
For the S-8352 Series, connecting an external transistor increases the output current. An enhancement (N-channel)
MOS FET type or a bipolar (NPN) type can be used as the external transistor.
4. 1
Enhancement (N-channel) MOS FET Type
Figure 19 is a circuit example using a MOS FET transistor (N-channel).
VOUT
+
−
EXT
ON / OFF
*1
VOUT
+
−
VSS
*1. For A type.
Figure 19
Circuit Example Using MOS FET (N-channel) Type
An N-channel power MOS FET should be used for the MOS FET. In particular, the EXT pin can drive a MOS
FET with a gate capacitance of around 1000 pF. Because the gate voltage and current of the external power
MOS FET are supplied from the stepped-up output voltage (VOUT), the MOS FET is driven more effectively.
A large current may flow during startup, depending on the MOS FET selection. The S-8352 Series does not
feature overcurrent protection for the external MOS FET, so perform sufficient evaluation using the actual devices.
Also recommend to use a MOS FET with an input capacitance of 700 pF or less.
Since the ON-resistance of the MOS FET might depend on the difference between the output voltage (VOUT) and
the threshold voltage of the MOS FET, and affect the output current as well as the efficiency, the threshold voltage
should be low. When the output voltage is as low as 2.0 V, like in the S-8352A20, the circuit operates only
when the MOS FET has a threshold voltage lower than the output voltage.
Seiko Instruments Inc.
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STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
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4. 2
Bipolar (NPN) Type
A circuit example using the CPH3210 (hFE = 200 to 560) from Sanyo Electric Co., Ltd. as a bipolar transistor
(NPN) is shown in Figure 24 to 26 in the “„ Standard Circuits”. The hFE value and Rb value of the bipolar
transistor determine the driving capacity to increase the output current using a bipolar transistor. A peripheral
circuit example of the transistor is shown in Figure 20.
VOUT
*1
Cb
2200 pF
Pch
EXT
IPK
Rb
1 kΩ
Nch
*1. VDD for D type.
Figure 20
External Transistor Peripheral Circuit
The recommended Rb value is around 1 kΩ. Actually, calculate the necessary base current (Ib) from the bipolar
V
− 0 .7
0.4 *1
I
.
transistor (hFE) using Ib = PK , and select the smaller Rb value than Rb = OUT
−
hFE
Ib
IEXTH
A small Rb value can increase the output current, but the efficiency decreases. Since a current may flow on the
pulse and the voltage may drop due to wiring resistance or other factors in the actual circuit, therefore the
optimum Rb value should be determined by experiment.
Connecting the speed-up capacitor (Cb) in parallel with the Rb resistance as shown in Figure 20, decreases
switching loss and improves the efficiency.
1
.
The Cb value is calculated according to Cb ≤
2π • Rb • fosc • 0.7
Select a Cb value after performing sufficient evaluation since the optimum Cb value differs depending upon the
characteristics of the bipolar transistor.
*1. For D type, Rb =
22
VDD − 0.7
0 .4
−
.
Ib
IEXTH
Seiko Instruments Inc.
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5.
VDD / VOUT Separate Type (For S-8351/8352 Series D Type)
The D type provides separate internal circuit power supply (VDD pin) and output voltage setting pin (VOUT pin) in the
IC, making it ideal for the following applications.
(1) Changing the output voltage value using an external resistor
(2) Setting a high output voltage value, such as +15 V
Cautions 1. This IC starts a step-up operation at VDD = 0.8 V, but set 1.8 ≤ VDD ≤ 10 V to stabilize the output
voltage and frequency of the oscillator. (Input a voltage of 1.8 V or more at the VDD pin for all
products with a setting less than 1.9 V.) An input voltage of 1.8 V or more at the VDD pin allows
connection of the VDD pin to either the input voltage VIN pin or output VOUT pin.
2. Choose external resistors RA and RB so as to not affect the output voltage, considering that there
is impedance between the VOUT pin and VSS pin in the IC chip. The internal resistance
between the VOUT pin and VSS pin is as follows :
(1) S-835xx18 : 2.1 MΩ to 14.8 MΩ
(2) S-835xx20 : 1.4 MΩ to 14.8 MΩ
(3) S-835xx30 : 1.4 MΩ to 14.2 MΩ
(4) S-835xx50 : 1.4 MΩ to 12.1 MΩ
3. Attach a capacitor (CC) in parallel to the RA resistance when an unstable event such as
oscillation of the output voltage occurs. Calculate CC using the following equation :
1
CC [ F ] =
2 • π • R A • 20 kHz
Seiko Instruments Inc.
23
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
„ Standard Circuits
1.
S-8351 Series
(1)
A type
L
SD
CONT
VOUT
Protection
circuit
VIN
+
−
VREF
PFM control
CIN
circuit
+
CL
−
+
−
VSS
ON / OFF
Figure 21
(2)
B and C types
L
SD
CONT
VOUT
Protection
circuit
VIN
+
−
CIN
VREF
PFM control
circuit
+
+
−
−
VSS
Figure 22
24
Seiko Instruments Inc.
CL
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
(3)
D type
L
SD
CONT
Cc
Protection
circuit
VIN
+
−
CIN
VDD
IC internal
power
supply
PFM control
circuit
RA
VREF
VOUT
RB +
+
−
−
CL
VSS
Figure 23
Caution The above connection diagram will not guarantee successful operation.
evaluation using the actual application to set the constant.
Seiko Instruments Inc.
Perform through
25
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
2.
S-8352 Series
(1)
A type
SD
L
VOUT
VREF
2200 pF
VIN
+
−
PFM control
CIN
1 kΩ
EXT
circuit
+
+
−
−
CL
VSS
ON / OFF
Figure 24
(2)
B and C types
SD
L
VOUT
VREF
2200 pF
VIN
+
−
PFM control
CIN
1 kΩ
EXT
circuit
+
+
−
−
VSS
Figure 25
26
Seiko Instruments Inc.
CL
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
(3)
D type
SD VDD
L
2200 pF
VIN
+
−
PFM control
CIN
1 kΩ
Cc
IC internal
power
supply
EXT
circuit
RA
VREF
VOUT
RB +
+
−
−
CL
VSS
Figure 26
Caution
The above connection diagram and constants will not guarantee successful operation.
through evaluation using the actual application to set the constant.
Seiko Instruments Inc.
Perform
27
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
„ Precautions
• Mount the external capacitors, the diode, and the coil as close as possible to the IC.
• 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 they largely depend on the coil and the capacitor and
impedance used, fully check them using an actually mounted model.
• Make sure that the dissipation of the switching transistor (especially at a high temperature) does not exceed the
allowable power dissipation of the package.
• The performance of this IC varies depending on the design of the PCB patterns, peripheral circuits and external parts.
Thoroughly test all settings with your device. Also, try to use the recommended external parts. If not, contact an SII
sales person.
• When the impedance of the power supply is high, the shutdown pin is switched from “L” to “H”, or VIN is connected to
the power supply, note that the power supply voltage drops temporarily because a rush current flows into the power
supply.
• Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic
protection IC.
• SII claims no responsibility for any and all disputes arising out of or in connection with any infringement of the products
including this IC upon patents owned by third party.
28
Seiko Instruments Inc.
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
„ Characteristics (Typical Data)
1.
Input voltage (VIN) vs. Powe Supply Input Current at No Load (IIN)
IIN [μA]
Ta = 25°C
50
45
40
35
30
25
20
15
10
5
0
S-8351A30MC
S-8351A50MC
0
2.
1
2
3
VIN [V]
4
5
Output Voltage (VOUT) vs. Current Consumption 1 (ISS1)
S-8351A
S-8352A
Ta = 25 °C
80
60
ISS1 [μA]
60
ISS1 [μA]
Ta = 25 °C
80
40
40
20
20
0
1
2
3
4
5
6
0
1
7
2
3
VOUT [V]
3.
4
5
VOUT [V]
6
7
75
100
Temperature (Ta) vs. Current Consumption 1 (ISS1)
50
40
ISS1 [μA]
40
ISS1 [μA]
50
S-8351A30MC
S-8351A50MC
30
20
10
S-8352A30MC
S-8352A50MC
30
20
10
0
−50 −25
0
25 50
Ta [°C]
75
0
−50 −25
100
0
25 50
Ta [°C]
4. Output Voltage (VOUT) vs. Current Consumption 2 (ISS2) 5. Temperature (Ta) vs. Current Consumption 2 (ISS2)
5
4
4
ISS1 [μA]
ISS2 [μA]
Ta = 25°C
5
3
2
1
S-8351A30MC
S-8351A50MC
3
2
1
0
1
2
3
4
5
6
0
−50 −25
7
VOUT [V]
Seiko Instruments Inc.
0
25 50
Ta [°C]
75
100
29
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
6.
Temperature (Ta) vs. Oscillation Frequency (fOSC)
140
S-8351A30MC
S-8351A50MC
fOSC [kHz]
130
120
110
100
90
80
−50
7.
−25
0
25 50
Ta [°C]
75
100
Temperature (Ta) vs. Duty Ratio 1 (Duty1)
8.
Temperature (Ta) vs. Duty Ratio 2 (Duty2)
80
53
Duty2 [%]
78
Duty1 [%]
55
S-8351A30MC
S-8351A50MC
76
74
72
51
49
S-8351A30MC
S-8351A50MC
47
70
−50 −25
0
25 50
Ta [°C]
75
45
−50 −25
100
9. Output Voltage (VOUT) vs. Switching Current (ISW)
0
25 50
Ta [°C]
75
100
10. Temperature (Ta) vs. Switching Current (ISW)
Ta = 25°C
300
200
ISW [mA]
ISW [mA]
250
150
100
50
0
0
1
2
3 4
VOUT [V]
5
6
7
400
350
300
250
200
150
100
S-8351A30MC
S-8351A50MC
50
0
−50 −25 0
25 50
Ta [°C]
75
100
11. Output Voltage (VOUT) vs. EXT Pin Output Current “H” (IEXTH) 12. Temperature (Ta) vs. EXT Pin Output Current “H” (IEXTH)
40
IEXTH [mA]
IEXTH [mA]
Ta = 25°C
35
30
25
20
15
10
5
0
0
30
1
2
3
4
VOUT [V]
5
6
30
20
10
0
−50 −25
7
Seiko Instruments Inc.
S-8352A30MC
S-8352A50MC
0
25 50
Ta [°C]
75
100
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
13. Output Voltage (VOUT) vs. EXT Pin Output Current “L” (IEXTL) 14. Temperature (Ta) vs. EXT Pin Output Current “L” (IEXTL)
40
IEXTL [mA]
IEXTL [mA]
Ta = 25°C
35
30
25
20
15
10
5
0
0
1
2
3 4 5
VOUT [V]
6
30
20
10
0
−50 −25
7
S-8352A30MC
S-8352A50MC
0
25 50
Ta [°C]
75
100
15. Temperature (Ta) vs. Operation Start Voltage (VST1) 16. Temperature (Ta) vs. Retention Voltage (VHLD)
0.7
0.9
VHLD [V]
VST1 [V]
0.8
S-8351A30MC
S-8351A50MC
1.0
0.8
0.7
0.6
−50 −25
S-8351A30MC
S-8351A50MC
0.6
0.5
0.4
0.3
0
25 50
Ta [°C]
75
100
Seiko Instruments Inc.
0.2
−50 −25
0
25 50
Ta [°C]
75
100
31
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
17.
Transient Response Characteristics
The conditions for external parts are the same as those specified in the electrical characteristics.
(1)
Power-on (Ta = 25°C, RL = 250 Ω)
S-8351A30MC
S-8351A50MC
VIN = 0 → 1.8 V
VIN = 0 → 3 V
1.8 V
Input voltage
[0.5 V / div]
0V
3V
Input voltage
[1 V / div]
0V
5V
3V
Output voltage
[1 V / div]
Output voltage
[0.5 V / div]
0V
0V
t [0.2 ms / div]
t [0.2 ms / div]
S-8352A30MC
S-8352A50MC
VIN = 0 → 1.8 V
VIN = 0 → 3 V
1.8 V
Input voltage
[0.5 V / div]
0V
3V
Input voltage
[1 V / div]
0V
3V
5V
Output voltage
[1 V / div]
Output voltage
[0.5 V / div]
0V
0V
t [0.2 ms / div]
t [0.2 ms / div]
(2)
Power Supply Voltage Fluctuation (Ta = 25°C, RL = 250 Ω)
S-8351A30MC
S-8351A30MC
VIN = 1.2 → 1.8 V
Input voltage
[0.5 V /div]
1.2 V
VIN = 1.8 → 1.2 V
1.8 V
Output voltage
[0.1 V / div]
3V
1.8 V
Input voltage
[0.5 V / div]
Output voltage
[0.1 V / div]
3V
t [0.1 ms / div]
t [0.1 ms / div]
S-8351A50MC
S-8351A50MC
VIN = 2 → 3 V
VIN = 3 → 2 V
Input voltage
[0.5 V / div]
2V
3V
Output voltage
[0.1 V / div]
5V
3V
Input voltage
[0.5 V / div]
2V
Output voltage
[0.1 V / div]
5V
t [0.1 ms / div]
t [0.1 ms / div]
32
1.2 V
Seiko Instruments Inc.
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
S-8352A30MC
S-8352A30MC
VIN = 1.2 → 1.8 V
Input voltage
[0.5 V /div]
1.2 V
VIN = 1.8 → 1.2 V
1.8 V
Output voltage
[0.1 V / div]
3V
1.8 V
Input voltage
[0.5 V / div]
Output voltage
[0.1 V / div]
t [0.1 ms / div]
3V
t [0.1 ms / div]
S-8352A50MC
S-8352A50MC
VIN = 2 → 3 V
Input voltage
[0.5 V /div]
2V
VIN = 3 → 2 V
3V
Output voltage
[0.1 V / div]
5V
3V
Input voltage
[0.5 V / div]
2V
Output voltage
[0.1 V / div]
5V
t [0.1 ms / div]
t [0.1 ms / div]
(3)
1.2 V
Load Current Fluctuation (Ta = 25°C)
S-8351A30MC
VIN = 1.8 V, IOUT = 10 μA → 12 mA
Output current
S-8351A30MC
VIN = 1.8 V, IOUT = 12 mA → 10 μA
Output current
IOUT = 12 mA
Output voltage
[0.1 V / div]
3V
Output voltage
[0.1 V / div]
S-8351A50MC
VIN = 3 V, IOUT = 10 μA → 20 mA
IOUT = 20 mA
Output voltage
[0.1 V / div]
3V
t [0.1 ms / div]
t [0.1 ms / div]
Output current
IOUT = 10 μA
S-8351A50MC
VIN = 3 V, IOUT = 20 mA → 10 μA
Output current
5V
IOUT = 10 μA
Output voltage
[0.1 V / div]
t [0.1 ms / div]
5V
t [0.1 ms / div]
Seiko Instruments Inc.
33
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
S-8352A30MC
VIN = 1.8 V, IOUT = 10 μA → 12 mA
Output current
S-8352A30MC
VIN = 1.8 V, IOUT = 12 mA → 10 μA
Output current
IOUT = 12 mA
Output voltage
[0.1 V / div]
3V
IOUT = 10 μA
Output voltage
[0.1 V / div]
3V
t [0.1 ms / div]
t [0.1 ms / div]
S-8352A50MC
VIN = 3 V, IOUT = 10 μA → 20 mA
S-8352A50MC
VIN = 3 V, IOUT = 20 mA → 10 μA
IOUT = 20 mA
Output current
Output voltage
[0.1 V / div]
IOUT = 10 μA
Output current
5V
Output voltage
[0.1 V / div]
5V
t [0.1 ms / div]
t [0.1 ms / div]
(4)
ON/ OFF Pin Response (Ta = 25°C, RL = 250 Ω)
S-8351A30MC
S-8351A50MC
VIN = 1.8 V
ON / OFF voltage
VIN = 3 V
ON
ON
ON / OFF voltage
OFF
OFF
3V
Output voltage
[0.3 V / div]
5V
Output voltage
[0.5 V / div]
t [0.1 ms / div]
t [0.1 ms / div]
S-8352A30MC
S-8352A50MC
VIN = 1.8 V
ON / OFF voltage
VIN = 3 V
ON
ON / OFF voltage
OFF
Output voltage
[0.3 V / div]
5V
Output voltage
[0.5 V / div]
t [0.1 ms / div]
34
ON
OFF
3V
Seiko Instruments Inc.
t [0.1 ms / div]
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
„ Reference Data
Use this reference data to choose the external parts. This reference data makes it possible to choose the
recommended external part based on the application and characteristics data.
1.
External Parts for Reference Data
Table 18
Condition
Product Name
1
2
3
4
5
6
7
8
9
10
11
12
S-8351A30MC
S-8351A30MC
S-8351A30MC
S-8351A50MC
S-8351A50MC
S-8351A50MC
S-8352A30MC
S-8352A30MC
S-8352A30MC
S-8352A50MC
S-8352A50MC
S-8352A50MC
Output
Voltage
V
3.0
3.0
3.0
5.0
5.0
5.0
3.0
3.0
3.0
5.0
5.0
5.0
Power
MOS FET
Built-in
Built-in
Built-in
Built-in
Built-in
Built-in
External
External
External
External
External
External
Coil
CDRH6D28-470
CDRH6D28-101
CXLP120-101
CDRH6D28-101
CDRH125-221
CXLP120-470
CDRH6D28-220
CDRH6D28-101
CXLP120-470
CDRH6D28-220
CDRH6D28-101
CXLP120-101
The properties of the external parts are shown below.
Table 19
Part
Product Name
Evaluation coil
Manufacturer
CDRH6D28-220 Sumida Corporation
CDRH6D28-470 Sumida Corporation
CDRH6D28-101 Sumida Corporation
Coil
CDRH125-221
Sumida Corporation
CXLP120-470
Sumitomo Special Metals Co., Ltd
CXLP120-101
Sumitomo Special Metals Co., Ltd
*1. Direct current resistance
*2. Maximum allowable current
Table 20
Part
Diode
Product Name
MA2Z748
Capacitor
(Output
F93
capacitance)
Characteristics
22 μH, DCR *1 = 0.128 Ω, IMAX *2 = 1200 mA
47 μH, DCR *1 = 0.238 Ω, IMAX *2 = 800 mA
100 μH, DCR *1 = 0.535 Ω, IMAX *2 = 540 mA
220 μH, DCR *1 = 0.4 Ω, IMAX *2 = 800 mA
47 μH, DCR *1 = 0.95 Ω, IMAX *2 = 450 mA
100 μH, DCR *1 = 2.5 Ω, IMAX *2 = 200 mA
Properties of External Parts
Manufacturer
Matsushita Electronic Components
Co., Ltd.
Nichicon Corporation
VF*1
IF*2
= 0.4V,
(Shottky type)
Characteristics
= 0.3A
16V, 47μF
(Tantalum type)
VCBO*3 = 40V, VCEO*4 = 30V
hFE*5 = 200 min. (VCE = 2V, IC = 500mA)
CPH3210
Sanyo Electric Co.,Ltd.
fT*6 = 290 MHz typ. (VCE = 10V, IC = 500mA)
*1. Forward voltage, *2. Forward current, *3. Collector-to-base voltage, *4. Collector-to-emitter voltage, *5. DC
current gain, *6. Gain-bandwidth product
Transistor
(NPN)
Caution
The above values shown in the characteristics column of Table 19 and 20 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.
35
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
2.
Step-up Characteristics (Ta = 25°C)
The data of the step-up characteristics ((a) Input voltage (VIN) vs. Output voltage (VOUT) characteristics (Input voltage
stepped up), (b) Input voltage (VIN) vs. Output voltage (VOUT) characteristics (Input voltage stepped down), (c) Output
current (IOUT) vs. Output voltage (VOUT) characteristics, (d) Output current (IOUT) vs. Efficiency (η) characteristics
under conditions of 1 to 12 in Table 18 is shown below.
Condition 1
S-8351A30MC
(b) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage falling)
3.2
3.1
3.1
3.0
3.0
IOUT =
IOUT =
IOUT =
IOUT =
IOUT =
IOUT =
2.9
2.8
2.7
2.6
0
1
VIN
2
[V]
VOUT [V]
VOUT [V]
(a) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage raising)
3.2
0.1 mA
1 mA
10 mA
20 mA
50 mA
100 mA
3
2.8
100
150
IOUT [mA]
200
50
0.01
250
3.0
3.0
IOUT =
IOUT =
IOUT =
IOUT =
IOUT =
IOUT =
2.9
2.8
2.6
0
1
2
VIN [V]
VOUT [V]
3.1
2.7
0.1 mA
1 mA
10 mA
20 mA
50 mA
100 mA
VIN =
VIN =
VIN =
VIN =
VIN =
0.1
1.0
1.5
1.8
2.0
2.5
V
V
V
V
V
1
10
IOUT [mA]
100
1000
3
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 10 mA
IOUT = 20 mA
IOUT = 50 mA
IOUT = 100 mA
2.9
2.8
2.7
2.6
0
4
2.9
2.8
1
70
200
250
4
VIN = 1.0 V
VIN = 1.5 V
VIN = 1.8 V
VIN = 2.0 V
VIN = 2.5 V
60
100
150
IOUT [mA]
3
80
2.7
50
2
VIN [V]
(d) Output current (IOUT) vs. Efficiency (η)
90
η [%]
(c) Output current (IOUT) vs.Output voltage (VOUT)
3.2
VIN = 1.0 V,
VIN = 2.0 V
3.1
VIN = 1.5 V,
VIN = 2.5 V
VIN = 1.8 V
3.0
36
4
(b) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage falling)
3.2
3.1
2.6
0
3
S-8351A30MC
(a) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage raising)
3.2
VOUT [V]
70
60
50
2
VIN [V]
0.1 mA
1 mA
10 mA
20 mA
50 mA
100 mA
80
2.7
VOUT [V]
1
=
=
=
=
=
=
(d) Output current (IOUT) vs. Efficiency (η)
90
η [%]
VOUT [V]
2.6
0
4
2.9
Condition 2
2.8
2.7
(c) Output current (IOUT) vs.Output voltage (VOUT)
3.2
VIN = 1.0 V,
VIN = 2.0 V
VIN = 1.5 V,
VIN = 2.5 V
3.1
VIN = 1.8 V
3.0
2.6
0
IOUT
IOUT
IOUT
IOUT
IOUT
IOUT
2.9
50
0.01
Seiko Instruments Inc.
0.1
1
10
IOUT [mA]
100
1000
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
Condition 3
S-8351A30MC
(b) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage falling)
3.2
3.1
3.1
3.0
3.0
2.9
VOUT [V]
VOUT [V]
(a) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage raising)
3.2
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 10 mA
IOUT = 20 mA
IOUT = 50 mA
2.8
2.7
2.6
0
1
2
VIN [V]
3
2.6
0
4
2
VIN [V]
3
4
80
3.0
2.9
VIN = 1.0 V
VIN = 1.5 V
VIN = 1.8 V
VIN = 2.0 V
VIN = 2.5 V
2.8
2.7
2.6
0
Condition 4
η [%]
VOUT [V]
1
(d) Output current (IOUT) vs. Efficiency (η)
90
3.1
50
100
150
IOUT [mA]
200
70
50
0.01
250
1
10
IOUT [mA]
100
1000
(b) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage falling)
5.2
5.0
5.0
VOUT [V]
5.1
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 10 mA
IOUT = 50 mA
IOUT = 100 mA
IOUT = 150 mA
4.9
4.8
4.7
1
2
3
VIN [V]
4
5
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 10 mA
IOUT = 50 mA
IOUT = 100 mA
IOUT = 150 mA
4.9
4.8
4.7
4.6
0
6
(c) Output current (IOUT) vs.Output voltage (VOUT)
5.2
VIN = 1.5 V
5.1
VIN = 2.0 V
VIN = 3.0 V
5.0
1
η [%]
80
200
4
5
6
VIN = 1.0 V
VIN = 1.5 V
VIN = 2.0 V
VIN = 3.0 V
VIN = 4.0 V
70
4.7
100
150
IOUT [mA]
3
VIN [V]
90
4.8
50
2
(d) Output current (IOUT) vs. Efficiency (η)
100
4.9
4.6
0
0.1
S-8351A50MC
5.1
4.6
0
VIN = 1.0 V
VIN = 1.5 V
VIN = 1.8 V
VIN = 2.0 V
VIN = 2.5 V
60
(a) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage raising)
5.2
VOUT [V]
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 10 mA
IOUT = 20 mA
IOUT = 50 mA
2.8
2.7
(c) Output current (IOUT) vs.Output voltage (VOUT)
3.2
VOUT [V]
2.9
250
60
0.01
Seiko Instruments Inc.
0.1
1
10
IOUT [mA]
100
1000
37
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
Condition 5
S-8351A50MC
(a) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage raising)
5.2
(b) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage falling)
5.2
5.1
5.0
5.0
VOUT [V]
VOUT [V]
5.1
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 10 mA
IOUT = 50 mA
IOUT = 100 mA
IOUT = 150 mA
4.9
4.8
4.7
4.6
0
1
2
3
VIN [V]
4
η [%]
VOUT [V]
4.8
4.6
0
50
100
150
IOUT [mA]
200
3
VIN [V]
VIN = 1.0 V
VIN = 1.5 V
VIN = 2.0 V
VIN = 3.0 V
VIN = 4.0 V
0.1
1
10
IOUT [mA]
100
1000
S-8351A50MC
(b) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage falling)
5.2
5.1
5.1
5.0
5.0
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 10 mA
IOUT = 50 mA
IOUT = 100 mA
IOUT = 150 mA
4.9
4.8
4.7
4.6
0
VOUT [V]
VOUT [V]
60
0.01
250
(a) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage raising)
5.2
1
2
3
VIN [V]
4
5
4.9
4.8
4.7
4.6
0
6
(c) Output current (IOUT) vs.Output voltage (VOUT)
5.2
VIN = 1.5 V
VIN = 2.0 V
5.1
VIN = 3.0 V
5.0
1
4.8
70
VIN = 1.0 V
VIN = 1.5 V
VIN = 2.0 V
VIN = 3.0 V
VIN = 4.0 V
60
4.7
100
150
IOUT [mA]
200
3
VIN [V]
80
4.9
50
2
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 10 mA
IOUT = 50 mA
IOUT = 100 mA
IOUT = 150 mA
4
5
6
(d) Output current (IOUT) vs. Efficiency (η)
90
η [%]
VOUT [V]
80
70
4.7
38
2
90
4.9
4.6
0
1
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 10 mA
IOUT = 50 mA
IOUT = 100 mA
IOUT = 150 mA
4
5
6
(d) Output current (IOUT) vs. Efficiency (η)
100
(c) Output current (IOUT) vs.Output voltage (VOUT)
5.2
VIN = 1.5 V
5.1
VIN = 2.0 V
VIN = 3.0 V
5.0
Condition 6
4.8
4.7
4.6
0
6
5
4.9
250
50
0.01
Seiko Instruments Inc.
0.1
1
10
IOUT [mA]
100
1000
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
Condition 7
S-8352A30MC
(b) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage falling)
3.2
3.1
3.1
3.0
3.0
VOUT [V]
VOUT [V]
(a) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage raising)
3.2
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 10 mA
IOUT = 50 mA
IOUT = 100 mA
IOUT = 150 mA
2.9
2.8
2.7
2.6
0
1
2
VIN [V]
3
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 0 mA
IOUT = 50 mA
IOUT = 100 mA
IOUT = 150 mA
2.9
2.8
2.7
2.6
0
4
1
2
VIN [V]
3
4
(d) Output current (IOUT) vs. Efficiency (η)
90
(c) Output current (IOUT) vs.Output voltage (VOUT)
3.2
3.1
80
η [%]
VOUT [V]
3.0
2.9
VIN = 1.5 V
VIN = 1.8 V
VIN = 2.0 V
VIN = 2.5 V
2.8
2.7
2.6
0
Condition 8
50
VIN = 1.5 V
VIN = 1.8 V
VIN = 2.0 V
VIN = 2.5 V
60
50
0.01
100 150 200 250 300 350
IOUT [mA]
0.1
1
10
IOUT [mA]
100
1000
S-8352A30MC
(a) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage raising)
3.2
(b) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage falling)
3.2
3.1
3.1
3.0
3.0
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 10 mA
IOUT = 50 mA
IOUT = 100 mA
IOUT = 150 mA
2.9
2.8
2.7
2.6
0
1
2
VIN [V]
3
VOUT [V]
VOUT [V]
70
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 10 mA
IOUT = 50 mA
IOUT = 100 mA
IOUT = 150 mA
2.9
2.8
2.7
2.6
0
4
1
2
VIN [V]
3
4
(d) Output current (IOUT) vs. Efficiency (η)
90
(c) Output current (IOUT) vs.Output voltage (VOUT)
3.2
3.1
80
η [%]
VOUT [V]
3.0
2.9
2.8
2.7
2.6
0
VIN = 1.5 V
VIN = 1.8 V
VIN = 2.0 V
VIN = 2.5 V
50
70
VIN = 1.5 V
VIN = 1.8 V
VIN = 2.0 V
VIN = 2.5 V
60
100 150 200 250 300 350
IOUT [mA]
50
0.01
Seiko Instruments Inc.
0.1
1
10
IOUT [mA]
100
1000
39
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
Condition 9
S-8352A30MC
(a) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage raising)
3.2
(b) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage falling)
3.2
3.1
3.1
3.0
VOUT [V]
VOUT [V]
3.0
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 10 mA
IOUT = 50 mA
IOUT = 100 mA
IOUT = 150 mA
2.9
2.8
2.7
2.6
0
1
2
VIN [V]
3
2.8
2.7
2.6
0
4
1
2
VIN [V]
3
4
(d) Output current (IOUT) vs. Efficiency (η)
90
(c) Output current (IOUT) vs.Output voltage (VOUT)
3.2
3.1
80
3.0
η [%]
VOUT [V]
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 10 mA
IOUT = 50 mA
IOUT = 100 mA
IOUT = 150 mA
2.9
2.9
VIN = 1.5 V
VIN = 1.8 V
VIN = 2.0 V
VIN = 2.5 V
2.8
2.7
2.6
0
Condition 10
50
70
50
0.01
100 150 200 250 300 350
IOUT [mA]
1
10
IOUT [mA]
100
1000
(b) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage falling)
5.2
5.1
5.1
5.0
5.0
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 10 mA
IOUT = 50 mA
IOUT = 100 mA
IOUT = 150 mA
4.9
4.8
4.7
1
2
3
VIN [V]
4
VOUT [V]
VOUT [V]
0.1
S-8352A50MC
(a) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage raising)
5.2
4.6
0
VIN = 1.5 V
VIN = 1.8 V
VIN = 2.0 V
VIN = 2.5 V
60
6
5
(c) Output current (IOUT) vs.Output voltage (VOUT)
5.2
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 10 mA
IOUT = 50 mA
IOUT = 100 mA
IOUT = 150 mA
4.9
4.8
4.7
4.6
0
1
2
3
VIN [V]
4
5
6
(d) Output current (IOUT) vs. Efficiency (η)
90
5.1
80
4.9
4.8
4.7
4.6
0
40
VIN = 1.5 V
VIN = 2.0 V
VIN = 3.0 V
VIN = 4.0 V
50 100 150 200 250 300 350 400 450
IOUT [mA]
η [%]
VOUT [V]
5.0
70
VIN = 2.0 V
VIN = 3.0 V
VIN = 4.0 V
60
50
0.01
Seiko Instruments Inc.
0.1
1
10
IOUT [mA]
100
1000
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
Rev.3.0_00
S-8351/8352 Series
Condition 11
S-8352A50MC
(a) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage raising)
5.2
(b) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage falling)
5.2
5.1
5.1
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 10 mA
IOUT = 50 mA
IOUT = 100 mA
IOUT = 150 mA
4.9
4.8
4.7
4.6
0
VOUT [V]
VOUT [V]
5.0
1
2
3
VIN [V]
4
5
1
2
3
VIN [V]
5
4
6
(d) Output current (IOUT) vs. Efficiency (η)
90
80
η [%]
5.0
VOUT [V]
4.8
4.6
0
6
5.1
4.9
VIN = 1.5 V
VIN = 2.0 V
VIN = 3.0 V
VIN = 4.0 V
4.8
4.7
4.6
0
Condition 12
50
0.01
50 100 150 200 250 300 350 400 450
IOUT [mA]
VIN = 2.0 V
VIN = 3.0 V
VIN = 4.0 V
0.1
1
10
IOUT [mA]
100
1000
S-8352A50MC
(b) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage falling)
5.2
5.1
5.1
5.0
4.9
VOUT [V]
5.0
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 10 mA
IOUT = 50 mA
IOUT = 100 mA
4.8
4.7
4.6
0
70
60
(a) Input voltage (VIN) vs. Output voltage (VOUT)
(Input voltage raising)
5.2
VOUT [V]
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 10 mA
IOUT = 50 mA
IOUT = 100 mA
IOUT = 150 mA
4.9
4.7
(c) Output current (IOUT) vs.Output voltage (VOUT)
5.2
1
2
3
VIN [V]
4
5
4.9
IOUT = 0.1 mA
IOUT = 1 mA
IOUT = 10 mA
IOUT = 50 mA
IOUT = 100 mA
4.8
4.7
4.6
0
6
(c) Output current (IOUT) vs.Output voltage (VOUT)
5.2
1
2
3
VIN [V]
4
5
6
(d) Output current (IOUT) vs. Efficiency (η)
90
5.1
80
η [%]
5.0
VOUT [V]
5.0
4.9
4.8
VIN=2.0 V
VIN=3.0 V
VIN=4.0 V
4.7
4.6
0
50 100 150 200 250 300 350 400 450
IOUT [mA]
70
60
50
0.01
Seiko Instruments Inc.
VIN = 3.0 V
VIN = 4.0 V
0.1
1
10
IOUT [mA]
100
1000
41
2.9±0.2
1
2
3
0.16 +0.1
-0.05
0.95±0.1
1.9±0.2
0.4±0.1
No. MP003-A-P-SD-1.1
TITLE
SOT233-A-PKG Dimensions
MP003-A-P-SD-1.1
No.
SCALE
UNIT
mm
Seiko Instruments Inc.
+0.1
1.5 -0.05
4.0±0.1
2.0±0.1
1.1±0.1
0.25±0.05
1.6±0.1
4.0±0.1
2.85±0.2
3
2
1
Feed direction
No. MP003-A-C-SD-1.1
TITLE
No.
SOT233-A-Carrier Tape
MP003-A-C-SD-1.1
SCALE
UNIT
mm
Seiko Instruments Inc.
12.5max.
9.0±0.3
Enlarged drawing in the central part
ø13±0.2
(60°)
(60°)
No. MP003-A-R-SD-1.1
TITLE
SOT233-A-Reel
No.
MP003-A-R-SD-1.1
SCALE
UNIT
QTY.
3,000
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
4.5±0.1
1.5±0.1
1.6±0.2
1
2
3
1.5±0.1 1.5±0.1
0.4±0.05
45°
0.4±0.1
0.4±0.1
0.45±0.1
No. UP003-A-P-SD-1.1
TITLE
SOT893-A-PKG Dimensions
No.
UP003-A-P-SD-1.1
SCALE
UNIT
mm
Seiko Instruments Inc.
+0.1
ø1.5 -0
4.0±0.1(10 pitches : 40.0±0.2)
2.0±0.05
ø1.5 +0.1
-0
5° max.
0.3±0.05
8.0±0.1
2.0±0.1
4.75±0.1
Feed direction
No. UP003-A-C-SD-1.1
TITLE
SOT893-A-Carrier Tape
No.
UP003-A-C-SD-1.1
SCALE
UNIT
mm
Seiko Instruments Inc.
16.5max.
13.0±0.3
Enlarged drawing in the central part
(60°)
(60°)
No. UP003-A-R-SD-1.1
SOT893-A-Reel
TITLE
No.
UP003-A-R-SD-1.1
SCALE
UNIT
QTY.
mm
Seiko Instruments Inc.
1,000
www.sii-ic.com
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