SII S-8533A60AFT-TB-G

Rev.2.3_00
STEP-DOWN, SYNCHRONOUS PWM CONTROL
SWITCHING REGULATOR CONTROLLER
S-8533 Series
The S-8533 Series is a synchronous PWM control CMOS step-down
switching regulator controller that includes a reference voltage source,
synchronous circuit, oscillation circuit, error amplifier, phase
compensation circuit, and PWM controller.
An efficient step-down switching regulator can be realized simply by
adding external P-channel and N-channel power MOS FETs, one coil,
and three capacitors.
Since the oscillation frequency is a high 300 kHz, the S-8533 can be
used to configure a high efficiency step-down switching regulator
capable of driving high output current using small external parts and a
3 to 10% increase in efficiency is obtained compared to conventional
step-down switching regulators.
The 8-Pin TSSOP package and high oscillation frequency make the S8533 ideal as the main power supply for portable devices.
„ Features
• Synchronous rectification system realizing high efficiency (typ. 94%)
• Use at maximum duty ratio = 100% and use of a battery up to maximum life is possible by using P-channel and Nchannel power MOS FETs externally.
• Oscillation frequency :
300 kHz typ.
• Input voltage :
2.7 to 16.0 V
• Output voltage :
1.25 V
1.3 to 6.0 V, selectable in 0.1 V steps
• Output voltage accuracy : ±2.0%
• Soft-start function set by an external capacitor (CSS)
• Shutdown function
• Small package :
8-Pin TSSOP
• Lead-free products
„ Applications
•
•
•
•
Constant voltage power supply for hard disks and DVD drivers
Power supplies for portable devices, such as digital cameras, PDAs, electronic organizers, and cellular phones
Main or sub power supply for notebook PCs and peripherals
Constant voltage power supply for cameras, video equipment, and communication equipment
„ Package
Package Name
8-Pin TSSOP
Package
Drawing Code
Tape
Reel
FT008-A
FT008-E
FT008-E
Seiko Instruments Inc.
1
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
„ Block Diagram
L
Tr
VIN
Oscillation
circuit
VOUT
+
PDRV
NDRV
+
VIN
CIN
CSS
PWM control circuit
P.N feed-through
prevention circuit
−
+
Tr
CSS
Reference voltage
source with soft start
VSS
ON / OFF
Remark
All the diodes in the figure are parasitic diodes.
Figure 1
2
COUT
Seiko Instruments Inc.
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
„ Product Name Structure
The output voltage for the S-8533 Series can be selected depending on usage. Refer to “1. Product name” for the
definition of the product name and “2. Product name list” for the full product names.
1. Product Name
S-8533A
xx
x
FT
− TB
− G
IC direction in tape specifications*1
Package code
FT : 8-Pin TSSOP
Output voltage
A : 1.3 to 6.0 V
5 : 1.25 V
Output voltage
13 to 60
(E.g., when the output voltage is 1.5 V, it is expressed as 15.)
The product whose output voltage is 1.25 V expresses 12.
*1. Refer to the taping specifications.
2. Product Name List
Output Voltage
Product Name
1.25 V
S-8533A125FT-TB-G
1.3 V
S-8533A13AFT-TB-G
1.4 V
S-8533A14AFT-TB-G
1.5 V
S-8533A15AFT-TB-G
1.8 V
S-8533A18AFT-TB-G
2.5 V
S-8533A25AFT-TB-G
2.7 V
S-8533A27AFT-TB-G
2.8 V
S-8533A28AFT-TB-G
3.0 V
S-8533A30AFT-TB-G
3.3 V
S-8533A33AFT-TB-G
3.9 V
S-8533A39AFT-TB-G
4.1 V
S-8533A41AFT-TB-G
4.5 V
S-8533A45AFT-TB-G
4.8 V
S-8533A48AFT-TB-G
4.9 V
S-8533A49AFT-TB-G
5.0 V
S-8533A50AFT-TB-G
5.5 V
S-8533A55AFT-TB-G
6.0 V
S-8533A60AFT-TB-G
Remark Contact the SII marketing department for the availability of product samples other than those specified
above.
Seiko Instruments Inc.
3
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
„ Pin Configurations
Table 1
8-Pin TSSOP
Top view
8
7
6
5
1
2
3
4
Figure 2
4
Pin No.
1
2
Symbol
NC*1
VOUT
Pin Description
No connection
Output voltage pin
Shutdown pin
H : Normal operation (step-down operation)
3
ON/ OFF
L : Step-down operation stopped (all circuits
deactivated)
4
CSS
Soft start capacitor connection pin
5
VSS
GND pin
6
NDRV
External N-channel connection pin
7
PDRV
External P-channel connection pin
8
VIN
IC power supply pin
*1. The NC pin is electrically open. Connection of this pin to VIN or VSS is
allowed.
Seiko Instruments Inc.
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
„ Absolute Maximum Ratings
Table 2
Parameter
Symbol
VIN pin voltage
VOUT pin voltage
ON/OFF pin voltage
CSS pin voltage
NDRV pin voltage
PDRV pin voltage
NDRV pin current
PDRV pin current
Power dissipation
VIN
VOUT
VON/OFF
VCSS
VNDRV
VPDRV
INDRV
IPDRV
PD
Operating ambient temperature
Topr
Storage temperature
Tstg
*1. When mounted on board
[Mounted board]
(1) Board size : 114.3 mm × 76.2 mm × t1.6 mm
(2) Board name : JEDEC STANDARD51-7
(Ta = 25°C unless otherwise specified)
Absolute Maximum Rating
Unit
VSS − 0.3 to VSS + 18
V
VSS − 0.3 to VSS + 18
V
VSS − 0.3 to VSS + 18
V
VSS − 0.3 to VIN + 0.3
V
VSS − 0.3 to VIN + 0.3
V
VSS − 0.3 to VIN + 0.3
V
±100
mA
±100
mA
300 (When not mounted on board)
mW
700*1
mW
−40 to +85
°C
−40 to +125
°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
400
Power dissipation PD (mW)
Power dissipation PD (mW)
800
700
600
500
400
300
200
100
0
0
50
100
150
300
200
100
0
Ambient temperature Ta (°C)
0
50
100
150
Ambient temperature Ta (°C)
Figure 3 Power Dissipation of Package
Seiko Instruments Inc.
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STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
„ Electrical Characteristics
Table 3
VIN = VOUT × 1.5 V, IOUT = VOUT/50 A (In case VOUT ≤ 1.8 V, VIN = 2.7 V) (Ta = 25°C unless otherwise specified)
Parameter
Output voltage
Symbol
*1
VOUT(E)
Input voltage
VIN
Measurement
Conditions
Min.
Typ.
Max.
Unit
−
VOUT(S)
× 0.98
VOUT(S)
VOUT(S)
× 1.02
V
2
−
Circuit
2.7
−
16.0
V
1
−
30
70
μA
1
−
−
1.0
μA
1
Current consumption 1
ISS1
No external parts, VOUT = VOUT(S) × 0.95
(Duty ratio 100%)
Current consumption
during power-off
ISSS
VON/OFF = 0 V
PDRV pin output current
IPDRVH
No external parts, VOUT = VOUT(S) × 1.5,
VIN = 9.0 V, VPDRV = VIN − 0.2 V
−12
−18
−
mA
1
IPDRVL
No external parts, VOUT = VOUT(S) × 0.95,
VIN = 9.0 V, VPDRV = 0.2 V
19
27
−
mA
1
INDRVH
No external parts, VOUT = VOUT(S) × 1.5,
VIN = 9.0 V, VNDRV = VIN − 0.2 V
−10
−14
−
mA
1
INDRVL
No external parts, VOUT = VOUT(S) × 0.95,
VIN = 9.0 V, VNDRV = 0.2 V
35
50
−
mA
1
ΔVOUT1
VIN = VOUT(S) × 1.2 to 16 V
S-8533A125,
S-8533A13A to 29A
−
VOUT(E)
× 1.0%
VOUT(E)
× 2.5%
V
2
S-8533A30A to 60A
−
VOUT(E)
× 1.0%
VOUT(E)
× 2.0%
V
2
NDRV pin output current
Line regulation
*2
Load regulation
ΔVOUT2
IOUT = 10 μA to IOUT (see above) × 1.25
−
VOUT(E)
× 0.5%
VOUT(E)
× 1.0%
V
2
Output voltage
temperature coefficient
ΔVOUT
ΔTa • VOUT
Ta = −40 to +85°C
−
±100
−
ppm/°C
−
Oscillation frequency
fOSC
Measure waveform at the PDRV pin.
255
300
345
kHz
2
MaxDuty
The same condition as lSS1. Measure waveform at
the PDRV pin.
100
−
−
%
1
Maximum duty ratio
VOUT pin input current
IVOUT
VOUT = 5.0 V
0.01
0.1
4.0
μA
1
ON/ OFF pin input
voltage
VSH
The same condition as ISS1.
VIN = 2.7 V and check that PDRV pin = "L".
1.8
−
−
V
1
VSL
The same condition as ISS1.
VIN = 16.0 V and check that PDRV pin = "H".
−
−
0.3
V
1
ON/ OFF pin input
leakage current
ISH
The same condition as ISS1. VON/OFF = VIN
−0.1
−
0.1
μA
1
ISL
The same condition as ISS1. VON/OFF = 0 V
−0.1
−
0.1
μA
1
Soft-start time
tSS
The same condition as ISS1. Measure time until
PDRV pin oscillates.
5.0
8.0
16.0
ms
1
Efficiency
EFFI
*3, IOUT = 200 to 400 mA, S-8533A33A
−
94
−
%
3
External parts :
CD105 (22 μH)
Coil :
Sumida Corporation
Diode :
Matsushita Electric Industrial Co., Ltd. MA737 (Schottky diode)
Capacitor :
Nichicon Corporation
F93 (16 V, 47 μF, tantalum) × 2
Transistor :
Toshiba Corporation
2SA1213-Y
Base resistance : 1 kΩ
Base capacitor :
2200 pF
CSS :
4700 pF
CNDRV :
1000 pF
*1. VOUT(S) : Nominal output voltage value
VOUT(E) : Actual output voltage value : VIN = VOUT × 1.5 V, IOUT = VOUT/50 A (If VOUT ≤ 1.8 V, VIN = 2.7 V.)
*2. In case VOUT(S) ≤ 2.2 V, VIN = 2.7 to 16 V
*3. External parts
6
Coil :
Sumida Corporation
CDRH104R (22 μH)
Capacitor :
Nichicon Corporation
F93 (16 V, 47 μF, tantalum) × 2
P-channel power MOS FET :
Sanyo Electric Co., Ltd. CPH6303 (VGS = 10 V max.)
N-channel power MOS FET :
Sanyo Electric Co., Ltd. CPH6403 (VGS = 10 V max.)
CSS :
4700 pF
Seiko Instruments Inc.
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
„ Measurement Circuits
1.
A
0.1 μF
VIN
PDRV
A
VOUT
A
NDRV
A
CSS
4700 pF
A
ON/OFF
VSS
Figure 4
2.
2200 pF
+
A
0.1 μF
F93
22 μF × 3
VIN
PDRV
1 kΩ
+
F93
22 μF × 3
2SA1213-Y
CSS
4700 pF
MA737
ON/OFF
CD105
22 μH
VOUT
VSS
+
+
F93 F93
47 μF 47 μF
CNDRV
1000 pF
NDRV
Figure 5
3.
+
A
CPH6303
0.1 μF
F93
22 μF
VIN
PDRV
CSS
C DRH104R
22 μH
4700 pF
ON/OFF
VOUT
VSS
+
+
IOUT
F93 F93
47 μF 47 μF
CPH6403
NDRV
Figure 6
Seiko Instruments Inc.
7
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
„ Operation
1. Synchronous PWM Control Step-down DC-DC Converter
1. 1 Synchronous Rectification
A synchronous rectifying DC-DC converter enables a greater reduction in the power consumption of the external
rectifying element compared with a conventional DC-DC converter. In addition, incorporating a P and N feedthrough prevention circuit reduces the feed-through current during operation of external transistors (P-channel and
N-channel), making the operating power consumption extremely low.
1. 2 PWM Control
The S-8533 Series is a DC-DC converter that uses pulse width modulation (PWM) and is characterized by its low
current consumption.
In conventional modulation PFM system DC-DC converters, pulses are skipped when they are operated with a low
output load current, causing variations in the ripple frequency of the output voltage and an increase in the ripple
voltage. Both of these effects constitute inherent drawbacks to those converters.
In the S-8533 Series, the pulse width varies in the range from 0 to 100% according to the load current, yet the ripple
voltage produced by the switching can easily be eliminated by a filter since the switching frequency is always
constant. When the pulse width is 0% (when there is no load or the input voltage is high), current consumption is
low since pulses are skipped.
2. Soft-Start Function
The S-8533 Series has a built-in soft-start circuit.
This circuit enables the output voltage (VOUT) to rise gradually over the specified soft-start time (tSS) to suppress the
overshooting of the output voltage, when the power is switched on or the ON/OFF pin is set “H”.
The soft-start time can be set with an external capacitance (CSS).
The time needed for the output voltage to reach 95% of the set output voltage value is calculated by the following
formula.
tSS [ms] = 0.002 × CSS [pF]
Soft-start time (t SS) [ms]
60
50
40
30
20
10
0
0
5000
10000
15000
External capacitance (CSS) [pF]
20000
Figure 7 Soft-Start Time
The value for CSS should be selected to give enough margin to the soft-start time against the power supply rise
time. If the soft-start time is short, possibility for output voltage overshoot, input current rush, and malfunction of the
IC increases.
8
Seiko Instruments Inc.
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
3. ON/OFF Pin (Shutdown Pin)
This pin is used to activate and deactivate the step-down operation.
When the ON/OFF pin is set to “L”, all the internal circuits stop working, and substantial savings in current
consumption are thus achieved. The voltage of the PDRV pin goes to VIN level and voltage of the NDRV pin goes
to VSS level to shut off the respective transistors.
The ON/OFF pin is configured as shown in Figure 8. Since pull-up or pull-down is not performed internally,
operation where the ON/OFF pin is in a floating state should be avoided. Application of a voltage of 0.3 to 1.8 V to
the pin should also be avoided lest the current consumption increases. When the ON/OFF pin is not used, it should
be connected to the VIN pin.
VIN
ON/OFF Pin
CR Oscillation
Circuit
Output
Voltage
“H”
“L”
Active
Non-active
Set value
Open
ON/OFF
VSS
Figure 8 ON/OFF Pin Structure
4. 100% Duty Cycle
The S-8533 Series operates with a maximum duty cycle of 100%. The switching transistor can be kept on to supply
current to the load continually, even in cases where the input voltage falls below the preset output voltage value.
The output voltage under these circumstances is equal to the subtraction of the lowering due to the DC resistance
of the coil and the on-resistance of the switching transistor from the input voltage.
5. Back-Flow Current
Since the S-8533 Series performs PWM synchronous rectification under a light load, current flows backward in the
VIN direction. The back-flow current therefore reaches its peak when there is no load (see Figure 9). Pay attention
to the maximum back-flow current value, which can be calculated from the following expressions.
Duty (IOUT = 0) = VOUT/VIN
Example : VIN = 5 V, VOUT = 3 V, Duty = 60%
ΔIL = ΔV/L × ton = (VIN − VOUT) × Duty/(L × fOSC) × 1.2
Example : VIN = 5 V, VOUT = 3 V, fOSC = 300 kHz, L = 22 μH, ΔIL = 218 mA
ILmax. = ΔIL/2 = 109 mA, ILmin. = −ΔIL/2 = −109 mA
When there is no load, the current waveform becomes a triangular wave with the maximum, ILmax., and the
minimum, ILmin., which is negative. The negative current, shaded regions in Figure 10, flows backward.
When the output current (IOUT) is approximately 109 mA under the above conditions, the current does not flow
backward since the minimum value (ILmin) of the triangular wave becomes 0 mA.
When an input capacitor (CIN) is installed, back-flow current to the power source is negligible since the back-flow
current is absorbed by the input capacitor. The input capacitor is indispensable to reduce back-flow current to the
power source.
Seiko Instruments Inc.
9
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
Though the conditions mentioned above are required to prevent back-flow current, they are guidelines. Check the
validity by measuring the prototype or the actual device.
L
Back-flow current
VIN
VIN PDRV
NDRV
+
CIN
Coil
current IL
VOUT
+
VSS
Figure 9 Back-Flow Current
Coil current under no load
Coil current when 109 mA
flows as a load
IL
218 mA
IL
109 mA
0 mA
I OUT
−109 mA
ILmax.
IL max.
ΔIL
109 mA
I OUT
ΔIL
Back-flow
current
IL min.
0 mA
Back-flow current = 0 mA
IL min.
Figure 10 Example for No Back-Flow Current
10
Seiko Instruments Inc.
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
„ External Parts Selection
1. Inductor
The inductance value (L) greatly affects the maximum output current (IOUT) and the efficiency (η).
As the L value is reduced gradually, the peak current (IPK) increases, the stability of the circuit is improved, and IOUT
increases. As the L value is made even smaller, the efficiency is lowered, and IOUT decreases since the current
driveability of the switching transistor is insufficient.
As the L value is increased, the dissipation in the switching transistor due to IPK decreases, and the efficiency
reaches the maximum at a certain L value. As the L value is made even larger, the efficiency degrades since the
dissipation due to the series resistance of the coil increases. IOUT also decreases.
An inductance of 22 μH is recommended for the S-8533 Series.
When choosing an inductor, attention to its allowable current should be paid since the current exceeding the
allowable value will cause magnetic saturation in the inductor, leading to a marked decline in efficiency and the
breakdown of the IC due to large current.
An inductor should therefore be selected so that IPK does not surpass its allowable current. IPK is expressed by the
following equation :
IPK = IOUT +
VOUT × (VIN − VOUT)
2 × fOSC × L × VIN
where fOSC (= 300 kHz) is the oscillation frequency.
2. Capacitors (CIN, COUT)
The capacitor (CIN) inserted on the input side serves to lower the power impedance, average input current, and
suppress back-flow current to the power source. Select the CIN value according to the impedance of the power
supplied, and select a capacitor that has low ESR (Equivalent Series Resistance) and large capacitance. It should
be approximately 47 to 100 μF, although the actual value depends on the impedance of the power source used and
load current value. When the input voltage is low and the load is large, the output voltage may become unstable.
In this case, increase the input capacitance.
For the output side capacitor (COUT), select a large capacitance with low ESR (Equivalent Series Resistance) to
smoothen the ripple voltage. When the input voltage is extremely high or the load current is extremely large, the
output voltage may become unstable. In this case, the unstable area will become narrow by selecting a large
capacitance for an output side capacitor. A tantalum electrolytic capacitor is recommended since the unstable area
widens when a capacitor with a large ESR, such as an aluminum electrolytic capacitor, or a capacitor with a small
ESR, such as a ceramic capacitor, is chosen. The range of the capacitance should generally be approximately 47
to 100 μF.
Fully evaluate input and output capacitors under the actual operating conditions to determine the best value.
Seiko Instruments Inc.
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STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
3. External Transistor
Enhancement (P-channel, N-channel) MOS FETs can be used as external switching transistors for the S-8533
Series.
3. 1 Enhancement (P-channel, N-channel) MOS FET
The PDRV/NDRV pin of the S-8533 Series is capable of directly driving a P-channel or N-channel MOS FET with a
gate capacity around 1000 pF.
When P-channel/N-channel MOS FETs are chosen, efficiency will be 2 to 3% higher than that achieved by a
PNP/NPN bipolar transistor since MOS FET switching speeds are higher than PNP/NPN bipolar transistors and
power dissipation due to the base current is avoided.
The important parameters in selecting MOS FETs include the threshold voltage, breakdown voltage between gate
and source, breakdown voltage between drain and source, total gate capacity, on-resistance, and the current
ratings.
The PDRV and NDRV pins swing from voltage VIN over to voltage VSS. If the input voltage is low, a MOS FET with a
low threshold voltage has to be used so that the MOS FET will turn on as required. If, conversely, the input voltage
is high, select a MOS FET whose gate-source breakdown voltage is higher than the input voltage by at least several
volts.
Immediately after the power is turned on, or when the power is turned off (that is, when the step-down operation is
terminated), the input voltage will be imposed across the drain and the source of the MOS FET. The transistor
therefore needs to have drain-source breakdown voltage that is also several volts higher than the input voltage.
The total gate capacity and the on-resistance affect the efficiency.
The power dissipation for charging and discharging the gate capacity by switching operation will affect the efficiency
especially at low load current region when the total gate capacity becomes larger and the input voltage becomes
higher. If the efficiency under light loads is a matter of particular concern, select a MOS FET with a small total gate
capacity.
In regions where the load current is high, the efficiency is affected by power dissipation caused by the on-resistance
of the MOS FET. If the efficiency under heavy loads is particularly important in the application, choose a MOS FET
with as low an on-resistance as possible.
As for the current rating, select a MOS FET whose maximum continuous drain current rating is higher than IPK.
If an external P-channel MOS FET has much different characteristics (input capacitance, threshold value, etc.) from
an external N-channel MOS FET, they turn ON at the same time, flowing a through current and reducing efficiency.
If a MOS FET with a large input capacitance is used, switching dissipation increases and efficiency decreases. If it
is used at several hundreds of mA or more, the dissipation at the MOS FET increases and may exceed the
permissible dissipation of the MOS FET. To select P-channel and N-channel MOS FETs, evaluate the performance
by testing under the actual condition.
Caution If the load current is large, the P-channel MOS FET dissipation increases and heat is generated.
Pay attention to dissipate heat from the P-channel MOS FET.
Efficiency data using Sanyo Electric Co., Ltd. CPH6303, CPH6403, and Vishay Siliconix Si3441DV and Si3442DV
for applications with an input voltage range of 6 to 8 V or less is included for reference. For applications with an
input voltage range of 6 to 8 V or more, efficiency data using Sanyo Electric Co., Ltd. CPH6302, CHP6402, and
Vishay Siliconix Si3454DV and Si3455DV is included. Refer to “„ Reference Data”.
Current flow in the parasitic diode is not allowed in some MOS FETs. In this case, a Schottky diode must be
connected in parallel to the MOS FET. The Schottky diode must have a low forward voltage, a high switching
speed, a reverse-direction withstand voltage of VIN or higher, and a current rating of IPK or higher.
12
Seiko Instruments Inc.
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
„ Standard Circuit
• Using MOS FET
VO UT
L
Pch Power
MOS FET
Nc h Power
MOS FET
1
8
+
VO N / OF F
C IN
S-8533
4
CS S
+
V IN
CO UT
5
Figure 11
Caution The above connection diagram does not guarantee correct operation. Perform sufficient evaluation
using the actual application to set the constants.
Seiko Instruments Inc.
13
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
„ Precautions
• Install the external capacitors, diode, coil, and other peripheral parts as close to the IC as possible, and make a onepoint grounding.
• Normally, the P-channel and N-channel MOS FETs do not turn ON at the same time. However, if the external Pchannel MOS FET has much different characteristics (input capacitance, Vth, etc.) from the external N-channel MOS
FET, they may turn ON at the same time, flowing a through current. Select P-channel and N-channel transistors with
similar characteristics.
• 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 coil, the capacitor and impedance of
power supply used, fully check them using an actually mounted model.
• If the input voltage is high and output current is low, pulses with a low duty ratio may be output, and then the duty ratio
may be 0% for several clocks.
• The PDRV and NDRV oscillation frequencies may be an integer fraction of 300 kHz at some input voltage and load
conditions. In this case, the ripple voltage may increase.
• The through current prevention circuit reduces through current by shifting the P-channel and N-channel transistor on
timing. It does not suppress the through current in the external transistors completely.
• Since PWM synchronous rectification is performed even when the load is light, current flows back to VIN. Check
whether the back-flow occurs and whether it affects the performance. (See “5. Back-Flow Current” in “„
Operation”.)
• The PDRV or NDRV oscillation frequency may vary in a voltage range, depending on input voltage.
• When decreasing the power supply voltage slowly, the IC operation may be undefined if the voltage falls below the
minimum operating voltage.
• Make sure that dissipation of the switching transistor especially at high temperature will not surpass the power
dissipation of the package.
• Switching regulator performance varies depending on the design of PCB patterns, peripheral circuits and parts.
Thoroughly evaluate the actual device when setting. When using parts other than those which are recommended,
contact the SII marketing department.
• Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic
protection circuit.
• 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.
14
Seiko Instruments Inc.
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
„ Characteristics (Typical Data)
1. Examples of Major Characteristics
(1) Current Consumption 1 (ISS1) vs. Input Voltage (VIN) (2) Oscillation Frequency (fOSC) vs. Input Voltage (VIN)
100
360
90
Ta = 25°C
80
340
Ta = 85°C
70
ISS1
(μA)
320
60
fOSC
(kHz) 300
50
Ta = 85°C
40
Ta = −40°C
280
30
Ta = −40°C
20
Ta = 25°C
260
10
240
0
2
4
6
8
10
12
14
16
2
4
6
8
VIN (V)
10
12
14
16
VIN (V)
(3) PDRV Pin Output Current “H” (IPDRVH) vs.
Input Voltage (VIN)
(4) PDRV Pin Output Current “L” (IPDRVL) vs.
Input Voltage (VIN)
70
70
60
60
50
50
Ta = −40°C
Ta = −40°C
IPDRVH 40
(mA)
30
IPDRVL 40
(mA)
30
20
Ta = 25°C
10
Ta = 85°C
0
2
4
6
8
10
12
14
Ta = 25°C
20
Ta = 85°C
10
0
16
2
4
6
8
VIN (V)
10
12
14
16
VIN (V)
(5) NDRV Pin Output Current “H” (INDRVH) vs.
Input Voltage (VIN)
(6) NDRV Pin Output Current “L” (INDRVL) vs.
Input Voltage (VIN)
70
120
60
100
Ta = −40°C
50
80
Ta = −40°C
INDRVH 40
(mA)
30
INDRVL
(mA) 60
Ta = 25°C
40
20
Ta = 25°C
10
Ta = 85°C
20
Ta = 85°C
0
2
4
6
8
10
12
14
0
16
2
4
6
8
VIN (V)
10
12
14
16
VIN (V)
(7) ON/OFF Pin Input Voltage “H” (VSH) vs.
Input Voltage (VIN)
(8) ON/OFF Pin Input Voltage “L” (VSL) vs.
Input Voltage (VIN)
1.7
1.8
1.6
1.5
1.4
Ta = −40°C
1.3
1.2
VSH 1.0
(V)
0.8
VSL
(V)
Ta = 25°C
1.1
Ta = −40°C
0.9
Ta = 85°C
0.6
0.7
0.4
Ta = 25°C
0.5
0.2
0
2
4
6
8
10
12
14
16
0.3
Ta = 85°C
2
VIN (V)
4
6
8
10
12
14
16
VIN (V)
Seiko Instruments Inc.
15
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
(9) Soft-Start Time (tSS) vs. Input Voltage (VIN)
16
14
Ta = −40°C
12
10
tSS
(ms)
8
6
Ta = 85°C
Ta = 25°C
4
2
0
2
4
6
8
10
12
14
16
VIN (V)
(10) Output Voltage (VOUT) vs. Input Voltage (VIN)
(1.5 V : S-8533A15AFT)
(11) Output Voltage (VOUT) vs. Input Voltage (VIN)
(3.3 V : S-8533A33AFT)
1.53
3.37
IOUT = 100 mA
3.35
1.52
IOUT = 0.1 mA
3.33
1.51
VOUT
(V) 1.50
VOUT 3.31
(V)
3.29
IOUT = 400 mA
3.27
1.48
3.25
2
4
6
8
10
12
14
16
3.23
2
VIN (V)
5.08
5.06
5.04
IOUT = 100 mA
5.02
VOUT
(V) 5.00
IOUT = 0.1 mA
4.98
4.96
IOUT = 400 mA
4.94
2
4
6
8
10
12
14
16
VIN (V)
16
4
6
8
10
VIN (V)
(12) Output Voltage (VOUT) vs. Input Voltage (VIN)
(5.0 V : S-8533A50AFT)
4.92
IOUT = 400 mA
IOUT = 100 mA
1.49
1.47
IOUT = 0.1 mA
Seiko Instruments Inc.
12
14
16
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
2. Examples of Transient Response Characteristics
(1) Power-on (VIN : 0 V → 2.7 V or 5.0 V or 7.5 V, 0 V → 9.0 V, IOUT : 10 mA)
S-8533A15AFT (VIN : 0 V → 2.7 V)
S-8533A15AFT (VIN : 0 V → 9.0 V)
10 V
10 V
Input voltage
(2.5 V/div)
Input voltage
(2.5 V/div)
0V
3V
Output voltage
(1 V/div)
0V
3V
Output voltage
(1 V/div)
0V
0V
t (2 ms/div)
S-8533A33AFT (VIN : 0 V → 5.0 V)
t (2 ms/div)
S-8533A33AFT (VIN : 0 V → 9.0 V)
10 V
10 V
Input voltage
(2.5 V/div)
Input voltage
(2.5 V/div)
0V
3V
Output voltage
(1 V/div)
0V
3V
Output voltage
(1 V/div)
0V
0V
t (2 ms/div)
S-8533A50AFT (VIN : 0 V → 7.5 V)
t (2 ms/div)
S-8533A50AFT (VIN : 0 V → 9.0 V)
10 V
10 V
Input voltage
(2.5 V/div)
Input voltage
(2.5 V/div)
0V
0V
4.5 V
Output voltage
(1.5 V/div)
0V
4.5 V
Output voltage
(1.5 V/div)
0V
t (2 ms/div)
t (2 ms/div)
Seiko Instruments Inc.
17
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
(2) ON/OFF Pin Response (VON/OFF : 0 V → 1.8 V, IOUT : 10 mA)
S-8533A15AFT (VIN : 2.7 V)
S-8533A15AFT (VIN : 9.0 V)
4V
4V
ON/OFF
pin voltage
(1 V/div)
ON/OFF
pin voltage
(1 V/div)
0V
3V
Output voltage
(1 V/div)
0V
3V
Output voltage
(1 V/div)
0V
0V
t (2 ms/div)
S-8533A33AFT (VIN : 5.0 V)
t (2 ms/div)
S-8533A33AFT (VIN : 9.0 V)
4V
4V
ON/OFF
pin voltage
(1 V/div)
ON/OFF
pin voltage
(1 V/div)
0V
3V
Output voltage
(1 V/div)
0V
3V
Output voltage
(1 V/div)
0V
0V
t (2 ms/div)
S-8533A50AFT (VIN : 7.5 V)
t (2 ms/div)
S-8533A50AFT (VIN : 9.0 V)
4V
4V
ON/OFF
pin voltage
(1 V/div)
ON/OFF
pin voltage
(1 V/div)
0V
4.5 V
Output voltage
(1.5 V/div)
0V
4.5 V
Output voltage
(1.5 V/div)
0V
0V
t (2 ms/div)
18
t (2 ms/div)
Seiko Instruments Inc.
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
(3) Load Fluctuations (IOUT : 0.1 mA → 500 mA, 500 mA → 0.1 mA, VIN : 2.7 V or 5.0 V or 7.5 V)
S-8533A15AFT (VIN : 2.7 V)
S-8533A15AFT (VIN : 2.7 V)
500 mA
Output current
0.1 mA
500 mA
Output current
0.1 mA
Output voltage
(0.1 V/div)
Output voltage
(0.1 V/div)
t (0.1 ms/div)
t (0.1 ms/div)
S-8533A33AFT (VIN : 5.0 V)
S-8533A33AFT (VIN : 5.0 V)
500 mA
Output current
0.1 mA
500 mA
Output current
0.1 mA
Output voltage
(0.1 V/div)
Output voltage
(0.1 V/div)
t (0.1 ms/div)
t (0.1 ms/div)
S-8533A50AFT (VIN : 7.5 V)
S-8533A50AFT (VIN : 7.5 V)
500 mA
Output current
0.1 mA
500 mA
Output current
0.1 mA
Output voltage
(0.1 V/div)
Output voltage
(0.1 V/div)
t (0.1 ms/div)
t (0.1 ms/div)
Seiko Instruments Inc.
19
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
(4) Input Voltage Fluctuations (VIN : 2.7 V → 9.0 V → 2.7 V, 5.0 V → 9.0 V → 5.0 V, 7.5 V → 9.0 V → 7.5 V)
S-8533A15AFT (IOUT : 10 mA)
S-8533A15AFT (IOUT : 500 mA)
10 V
10 V
Input voltage
(2.5 V/div)
Input voltage
(2.5 V/div)
0V
0V
Output voltage
(0.1 V/div)
Output voltage
(0.1 V/div)
t (0.5 ms/div)
S-8533A33AFT (IOUT : 10 mA)
t (0.5 ms/div)
S-8533A33AFT (IOUT : 500 mA)
10 V
10 V
Input voltage
(2.5 V/div)
Input voltage
(2.5 V/div)
0V
0V
Output voltage
(0.1 V/div)
Output voltage
(0.1 V/div)
t (0.5 ms/div)
S-8533A50AFT (IOUT : 10 mA)
t (0.5 ms/div)
S-8533A50AFT (IOUT : 500 mA)
10 V
10 V
Input voltage
(2.5 V/div)
Input voltage
(2.5 V/div)
0V
0V
Output voltage
(0.1 V/div)
Output voltage
(0.1 V/div)
t (0.5 ms/div)
20
t (0.5 ms/div)
Seiko Instruments Inc.
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
„ Reference Data
Reference data are intended for use in selecting peripheral parts to the IC. The information therefore provides
characteristic data in which external parts are selected with a view of wide variety of IC applications. All data show typical
values.
1. External Parts for Reference Data
Table 4 External Parts List for Output Current vs. Efficiency Characteristics
No.
Product Name
(1)
S-8533A15AFT
Output
Voltage
1.5 V
Inductor
CDRH104R/22 μH
Transistor
Transistor
Output
Input
P-channel
N-channel
Capacitor
Capacitor
47 μF × 2
47 μF, 0.1 μF
Application Condition
IOUT ≤ 2 A, VIN ≤ 8 V
CPH6303
CPH6403
Si3441DV
Si3442DV
IOUT ≤ 1.4 A, VIN ≤ 6 V
CPH6303
CPH6403
IOUT ≤ 2 A, VIN ≤ 8 V
(4)
Si3441DV
Si3442DV
IOUT ≤ 1.4 A, VIN ≤ 6 V
(5)
CPH6302
CPH6402
IOUT ≤ 2 A, VIN ≤ 16 V
Si3455DV
Si3454DV
IOUT ≤ 1.6 A, VIN ≤ 16 V
CPH6302
CPH6402
IOUT ≤ 2 A, VIN ≤ 16 V
Si3455DV
Si3454DV
IOUT ≤ 1.6 A, VIN ≤ 16 V
CPH6303
CPH6403
IOUT ≤ 2 A, VIN ≤ 8 V
Si3441DV
Si3442DV
IOUT ≤ 1.4 A, VIN ≤ 6 V
CPH6303
CPH6403
IOUT ≤ 2 A, VIN ≤ 8 V
Si3441DV
Si3442DV
IOUT ≤ 1.4 A, VIN ≤ 6 V
IOUT ≤ 2 A, VIN ≤ 16 V
(2)
(3)
S-8533A33AFT
3.3 V
(6)
(7)
S-8533A50AFT
5.0 V
S-8533A15AFT
1.5 V
S-8533A33AFT
3.3 V
(8)
(9)
CDRH104R/47 μH
(10)
(11)
(12)
(13)
CPH6302
CPH6402
(14)
Si3455DV
Si3454DV
IOUT ≤ 1.6 A, VIN ≤ 16 V
CPH6302
CPH6402
IOUT ≤ 2 A, VIN ≤ 16 V
Si3455DV
Si3454DV
IOUT ≤ 1.6 A, VIN ≤ 16 V
CPH6303
CPH6403
IOUT ≤ 2 A, VIN ≤ 8 V
Si3441DV
Si3442DV
IOUT ≤ 1.4 A, VIN ≤ 6 V
CPH6303
CPH6403
IOUT ≤ 2 A, VIN ≤ 8 V
(20)
Si3441DV
Si3442DV
IOUT ≤ 1.4 A, VIN ≤ 6 V
(21)
CPH6302
CPH6402
IOUT ≤ 2 A, VIN ≤ 16 V
(22)
Si3455DV
Si3454DV
IOUT ≤ 1.6 A, VIN ≤ 16 V
IOUT ≤ 2 A, VIN ≤ 16 V
(15)
S-8533A50AFT
5.0 V
S-8533A15AFT
1.5 V
S-8533A33AFT
3.3 V
(16)
(17)
CDRH104R/10 μH
(18)
(19)
(23)
S-8533A50AFT
5.0 V
(24)
(25)
(26)
S-8533A33AFT
3.3 V
CDRH125/10 μH
CPH6302
CPH6402
Si3455DV
Si3454DV
IOUT ≤ 1.6 A, VIN ≤ 16 V
CPH6303
CPH6403
IOUT ≤ 3 A, VIN ≤ 8 V
CPH6302
CPH6402
IOUT ≤ 3 A, VIN ≤ 16 V
Seiko Instruments Inc.
21
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
External Parts List for Ripple Data
Table 5 External Parts for Input Voltage vs. Ripple Voltage Characteristics Data
No.
Product Name
(27)
S-8533A15AFT
Output
Inductor
Voltage
1.5 V
CDRH104R/22 μH
Transistor
Transistor
Output
Input
P-channel
N-channel
Capacitor
Capacitor
47 μF × 2
47 μF, 0.1 μF
Application Condition
IOUT ≤ 2 A, VIN ≤ 8 V
CPH6303
CPH6403
Si3441DV
Si3442DV
IOUT ≤ 1.4 A, VIN ≤ 6 V
CPH6303
CPH6403
IOUT ≤ 2 A, VIN ≤ 8 V
(30)
Si3441DV
Si3442DV
IOUT ≤ 1.4 A, VIN ≤ 6 V
(31)
CPH6302
CPH6402
IOUT ≤ 2 A, VIN ≤ 16 V
Si3455DV
Si3454DV
IOUT ≤ 1.6 A, VIN ≤ 16 V
CPH6302
CPH6402
IOUT ≤ 2 A, VIN ≤ 16 V
Si3455DV
Si3454DV
IOUT ≤ 1.6 A, VIN ≤ 16 V
(28)
(29)
S-8533A33AFT
3.3 V
(32)
(33)
S-8533A50AFT
5.0 V
(34)
Performance Data for Parts
The following shows the performance of external parts.
Table 6 Performance of External Parts
Parts
Product
Name
Inductor
CDRH125
CDRH104R
Diode
Manufacturer
Sumida
Corporation
Characteristics
L Value
DC Resistance
Maximum
Current
10 μH
0.019 Ω
4.0 A
12.0 mm typ.
8.0 mm max.
12.3 mm max.
47 μH
22 μH
10 μH
0.095 Ω
0.054 Ω
0.026 Ω
1.9 A
2.5 A
3.8 A
10.2 mm typ.
4.0 mm max.
10.5 mm max.
Diameter
Height
Matsushita Electric
Forward current 1.5 A (@VF = 0.5 V)
Industrial Co., Ltd
Nichicon
Output
F93
Corporation
Capacity
VGS = 10 V max., ID = −4 A max., Vth = −0.4 V min.,
External
Sanyo
transistor
Ciss = 820 pF typ., RDS(ON) = 0.090 Ω max. (VGS = −4 V),
CPH6303
Electric Co., Ltd
(P-channel
CPH6 package
FET)
VGS = 20 V max., ID = −3 A max., Vth = −1.0 V min.,
Ciss = 300 pF typ., RDS(ON) = 0.145 Ω max. (VGS = −10 V),
CPH6302
CPH6 package
Vishay
VGS = 8 V max., ID = −3.3 A max., Vth = −0.45 V min.,
Si3441DV
Silliconix
RDS(ON) = 0.10 Ω max. (VGS = −4.5 V), TSOP-6 package
VGS = 20 V max., ID = −3.5 A max., Vth = −1.0 V min.,
Si3455DV
RDS(ON) = 0.100 Ω max. (VGS = −10 V), TSOP-6 package
VGS = 10 V max., ID = 6 A max., Vth = 0.4 V min.,
External
Sanyo
transistor
Ciss = 700 pF typ., RDS(ON) = 0.038 Ω max. (VGS= 4 V),
CPH6403
Electric Co., Ltd
(N-channel
CPH6 package
FET)
VGS = 24 V max., ID = 4 A max., Vth = 1.0 V min.,
Ciss = 240 pF typ., RDS(ON) = 0.75 Ω max. (VGS= 10 V),
CPH6402
CPH6 package
Vishay
VGS = 8 V max., ID = 4.0 A max., Vth = 0.6 V min.,
Si3442DV
Silliconix
RDS(ON) = 0.07 Ω max. (VGS = 4.5 V), TSOP-6 package
VGS = 20 V max., ID = 4.2 A max., Vth = 1.0 V min.,
Si3454DV
RDS(ON) = 0.065 Ω max. (VGS = 10 V), TSOP-6 package
Caution The value of each characteristic in Table 6 depends on the materials prepared by each manufacturer,
however, confirm the specifications by referring to respective materials when using any of the above.
22
MA737
Seiko Instruments Inc.
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
2. Output Current (IOUT) vs. Efficiency (η) Characteristics
The following shows the actual output current (IOUT) vs. efficiency (η) characteristics when the S-8533 Series is used
under conditions (1) to (26) in Table 4.
(1) S-8533A15AFT (CPH6303/CPH6403)
100
95
100
Efficiency η (%)
85
80
75
70
65
5.0 V
80
75
70
65
60
55
50
55
50
10
100
Ou tput current (mA)
1000
5.0 V
10000
(3) S-8533A33AFT (CPH6303/CPH6403)
1
10
1 00
Output curren t (mA)
7.0 V
4.95 V
70
65
V
N=
4.0 V
85
Efficiency η (%)
85
80
75
95
90
80
75
4.95 V
70
65
60
55
60
55
50
50
1
10
100
1000
10000
1
100
Output current (mA)
10
Output curren t (m A)
(5) S-8533A33AFT (CPH6302/CPH6402)
100
95
V IN = 4.95 V
95
1000
10000
(6) S-8533A33AFT (Si3454DV/Si3455DV)
100
V IN = 4.95 V
90
85
80
Efficiency η (%)
90
Efficie ncy η (% )
10000
100
V I N = 4.0 V
95
90
10 V
75
70
65
85
80
75
10 V
70
65
60
55
60
55
50
50
1
10
10 0
Output current (mA)
1000
1
10000
(7) S-8533A50AFT (CPH6302/CPH6402)
95
90
10
100
Output current (mA)
1000
10000
(8) S-8533A50AFT (Si3454DV/Si3455DV)
100
100
95
V I N = 6.0 V
V I N = 6.0 V
90
85
80
75
7.5 V
Efficiency η (%)
Efficiency η (%)
1000
(4) S-8533A33AFT (Si3441DV/Si3442DV)
100
Efficien cy η (% )
90
85
60
1
V IN = 2.7 V
95
V IN = 2.7 V
90
Efficiency η (%)
(2) S-8533A15AFT (Si3441DV/Si3442DV)
16 V
70
10 V
65
60
55
85
80
75
7.5 V
16 V
70
65
60
10 V
55
50
50
1
10
100
Output current (mA)
1000
10000
1
Seiko Instruments Inc.
10
100
Output current (mA)
1000
10000
23
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
(9) S-8533A15AFT (CPH6303/CPH6403)
(10) S-8533A15AFT (Si3441DV/Si3442DV)
100
100
95
95
90
Efficiency η (%)
Efficiency η (%)
90
V I N = 2.7 V
85
80
75
70
65
5.0 V
60
10
100
Ou tput current (mA)
1000
65
10 000
(11) S-8533A33AFT (CPH6303/CPH6403)
5.0 V
1
10
100
Output current (mA)
1000
10000
(12) S-8533A33AFT (Si3441DV/Si3442DV)
100
100
V I N = 4.0 V
95
Efficiency η (%)
80
7.0 V
75
70
V IN = 4.0 V
95
90
85
Efficiency η (%)
70
50
1
4.95 V
65
90
85
4.95 V
80
75
70
65
60
60
55
55
50
50
10
1
100
Output current (mA)
1 000
1
10000
(13) S-8533A33AFT (CPH6302/CPH6402)
10
100
Output current (mA)
1000
10000
(14) S-8533A33AFT (Si3454DV/Si3455DV)
100
100
V IN = 4.95 V
95
95
Efficiency η (%)
90
85
Efficiency η (%)
75
55
50
80
10 V
75
70
65
V I N = 4.95 V
90
85
80
75
70
10 V
65
60
55
60
55
50
50
10
1
100
Ou tput current (mA)
1 000
1
10000
(15) S-8533A50AFT (CPH6302/CPH6402)
10
100
Output current (m A)
1000
10000
(16) S-8533A50AFT (Si3454DV/Si3455DV)
100
100
V I N = 6.0 V
95
80
7.5 V
16 V
75
70
10 V
65
V I N = 6.0 V
95
90
85
Efficiency η (%)
Efficiency η (%)
80
60
55
90
85
80
75
7.5 V
16 V
70
65
10 V
60
60
55
55
50
50
1
24
V I N = 2 .7 V
85
10
100
Ou tput current (mA)
1 000
10000
1
Seiko Instruments Inc.
10
100
Output cu rrent (mA)
1000
10000
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
(17) S-8533A15AFT (CPH6303/CPH6403)
(18) S-8533A15AFT (Si3441DV/Si3442DV)
100
10 0
95
90
V IN = 2.7 V
85
80
75
70
65
5.0 V
60
75
70
65
60
55
50
10
100
Output current (mA)
1000
10000
(19) S-8533A33AFT (CPH6303/CPH6403)
100
Output current (mA)
1000
10000
(20) S-8533A33AFT (Si3441DV/Si3442DV)
1 00
V IN = 4.0 V
95
90
85
80
Efficiency η (% )
95
90
Efficiency η (% )
10
1
100
7.0 V
75
70
4.95 V
65
55
50
1000
10
1 00
95
90
V IN = 4.95 V
Efficiency η (%)
90
85
80
10 V
75
70
100
Output current (mA)
1000
10000
(22) S-8533A33AFT (Si3454DV/Si3455DV)
100
95
4.95 V
1
10000
(21) S-8533A33AFT (CPH6302/CPH6402)
4.0 V
70
65
60
100
Output current (m A)
N=
80
75
55
50
10
V
85
60
1
Efficiency η (%)
5.0 V
55
50
1
65
60
55
V
N=
4.95 V
85
80
75
70
10 V
65
60
55
50
50
1
10
100
Output current (mA)
1000
1
10000
(23) S-8533A50AFT (CPH6302/CPH6402)
10
100
Output current (mA)
1000
10000
(24) S-8533A50AFT (Si3454DV/Si3455DV)
100
100
95
V I N = 6.0 V
95
90
85
80
75
70
7.5 V
Efficiency η (%)
Efficiency η (% )
V I N = 2.7 V
85
80
Efficiency η (%)
Efficiency η (%)
95
90
16 V
10 V
65
60
55
V IN = 6.0 V
90
85
80
7.5 V
75
70
16 V
65
10 V
60
55
50
50
1
10
100
1000
10000
1
Output current (mA)
Seiko Instruments Inc.
10
100
Output current (mA)
1000
10 000
25
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
(25) S-8533A33AFT (CPH6303/CPH6403)
(26) S-8533A33AFT (CPH6302/CPH6402)
1 00
100
95
V I N = 10 V
90
85
Efficiency η (%)
Efficiency η (%)
95
V IN = 4.95 V
90
80
75
70
65
60
7.0 V
85
80
75
70
65
13 V
60
55
55
50
50
1
10
100
1000
10000
1
Output current (mA)
26
Seiko Instruments Inc.
10
100
Output cu rrent (mA)
1000
10000
STEP-DOWN, SYNCHRONOUS PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8533 Series
3. Output Current (IOUT) vs. Ripple Voltage (Vr) Characteristics
The following shows the actual output current (IOUT) vs. ripple voltage (Vr) characteristics when the S-8533 Series is
used under conditions (27) to (34) in Table 5.
(28) S-8533A15AFT (Si3441DV/Si3442DV)
50
50
45
40
45
35
30
5.0 V
V IN = 2.7 V
25
20
40
35
Ripple voltage Vr( mV)
Ripple voltage Vr (mV)
(27) S-8533A15AFT (CPH6303/CPH6403)
15
10
5
30
15
10
5
0
0
1
10
100
Output current (mA)
1000
10000
(29) S-8533A33AFT (CPH6303/CPH6403)
1
40
35
1000
10000
40
30
4.9 5 V
V I N = 4.0 V
Ripp le voltage Vr( mV)
Ripple voltage Vr (mV)
100
Out pu t current (mA)
50
45
45
7 .0 V
25
20
15
10
5
35
30
1
10
100
Output current (mA)
1000
20
15
10
5
0
10000
(31) S-8533A33AFT (CPH6302/CPH6402)
4.95 V
V IN = 4 .0 V
25
0
1
10
100
Output current (mA)
1000
10000
(32) S-8533A33AFT (Si3454DV/Si3455DV)
50
45
50
45
40
35
40
10 V
V I N = 4.95 V
Ripple voltage Vr( mV)
Ripple voltage Vr (mV)
10
(30) S-8533A33AFT (Si3441DV/Si3442DV)
50
30
25
20
15
10
5
10 V
V IN = 4.95 V
35
30
25
20
15
10
5
0
0
1
10
100
Output curren t (mA)
1000
50
45
1
10000
(33) S-8533A50AFT (CPH6302/CPH6402)
10
100
Output current (mA)
1000
10000
(34) S-8533A50AFT (Si3454DV/Si3455DV)
50
V I N = 6.0 V
7.5 V
16 V
10 V
45
40
Ripple voltage Vr( mV)
40
Ripple voltage Vr (mV)
5.0 V
V IN = 2.7 V
25
20
35
30
25
20
15
10
5
0
1
10
100
Out pu t current (mA)
1000
10000
V IN = 6.0 V
7.5 V
16 V
10 V
35
30
25
20
15
10
5
0
1
10
100
1000
10000
Output current (m A)
Seiko Instruments Inc.
27
+0.3
3.00 -0.2
8
5
1
4
0.17±0.05
0.2±0.1
0.65
No. FT008-A-P-SD-1.1
TITLE
TSSOP8-E-PKG Dimensions
FT008-A-P-SD-1.1
No.
SCALE
UNIT
mm
Seiko Instruments Inc.
4.0±0.1
2.0±0.05
ø1.55±0.05
0.3±0.05
+0.1
8.0±0.1
ø1.55 -0.05
(4.4)
+0.4
6.6 -0.2
1
8
4
5
Feed direction
No. FT008-E-C-SD-1.0
TITLE
TSSOP8-E-Carrier Tape
FT008-E-C-SD-1.0
No.
SCALE
UNIT
mm
Seiko Instruments Inc.
13.4±1.0
17.5±1.0
Enlarged drawing in the central part
ø21±0.8
2±0.5
ø13±0.5
No. FT008-E-R-SD-1.0
TSSOP8-E-Reel
TITLE
No.
FT008-E-R-SD-1.0
SCALE
QTY.
UNIT
mm
Seiko Instruments Inc.
3,000
•
•
•
•
•
•
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