SUPER-SMALL PACKAGE PWM CONTROL, PWM/PFM
CONTROL STEP-UP SWITCHING REGULATOR
The S-8353/8354 series is a CMOS step-up switching regu-
lator which consists of a reference voltage source, an oscil-
lation circuit, a power MOS FET, an error amplifier, a phase
compensation circuit, a PWM controller (S-8353) and a
PWM/PFM switching controller (S-8354).
The step-up switching regulator can be configured simply by
attaching a coil, capacitor, and diode externally. In addition
to the above features, the small package and low power
consumption of this series make it ideal for portable device
applications requiring high efficiency. The S-8353 series re-
alizes low ripple, high efficiency, and excellent transient char-
acteristics due to its PWM controller, which can vary the duty
ratio linearly from 0% to 83% (from 0% to 78% for 250 kHz
models), optimally-designed error amplifier, and phase com-
pensation circuits.
The S-8354 series features a PWM/PFM switching controller
that can switch the operation to a PFM controller under a
light load to prevent a decrease in efficiency.
S-8353/8354 series
FEATURES
• Low voltage operation:
Start-up is guaranteed from 0.9 V (I
OUT
= 1 mA)
• Low current consumption:
18.7
µA
typ. (50 kHz product, 3.3 V, during operation)
0.5
µA
max. (during power-off)
• Duty ratio:
Built-in PWM/PFM switching control circuit (S-8354)
15 to 83% (30 kHz and 50 kHz models),
15 to 78% (250 kHz models)
• External parts: Coil, capacitor, and diode
• Output voltage:
1.5 to 6.5 V (for V
DD
/V
OUT
separate types) or
2.0 to 6.5 V (for other than V
DD
/V
OUT
separate types)
(Selectable in 0.1 V steps)
• Output voltage accuracy:
±2.4%
• Oscillation frequency:
30, 50, and 250 kHz
• Soft start function:
6 ms typ. (50 kHz models)
• Package:
SOT-23-5, SOT-23-3, and SOT-89-3
APPLICATIONS
• Power supplies for portable equipment such as digital cameras,
electronic organizers, 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
PIN CONFIGURATIONS
SOT-23-5 Top view
5
S-835xD
S-835xJ
1 VOUT
2 VDD
3 NC
4 VSS
5 CONT
4
S-835xA
S-835xH
1 ON/OFF
2 VOUT
3 NC
4 VSS
5 CONT
SOT-23-3 Top view
1
1 VOUT
2 VSS
3 CONT
1
2
3
2
3
SOT-89-3 Top view
1 VSS
2 VOUT
3 CONT
1
2
3
FUNCTION LIST
Product name
S-8353AxxMC
S-8353AxxMA/UA
S-8353CxxMA
S-8353DxxMC
S-8353HxxMC
S-8353HxxMA/UA
S-8353JxxMC
S-8354AxxMC
S-8354AxxMA/UA
S-8354CxxMA
S-8354DxxMC
S-8354HxxMC
S-8354HxxMA/UA
S-8354JxxMC
Control system
PWM
PWM
PWM
PWM
PWM
PWM
PWM
PWM/PFM switched
PWM/PFM switched
PWM/PFM switched
PWM/PFM switched
PWM/PFM switched
PWM/PFM switched
PWM/PFM switched
Switching
frequency (kHz)
50
50
30
50
250
250
250
50
50
30
50
250
250
250
Shutdown
function
Yes
-
-
-
Yes
-
-
Yes
-
-
-
Yes
-
-
V
DD
/V
OUT
separation type
-
-
-
Yes
-
-
Yes
-
-
-
Yes
-
-
Yes
Package
SOT-23-5
SOT-23-3/SOT-89-3
SOT-23-3
SOT-23-5
SOT-23-5
SOT-23-3/SOT-89-3
SOT-23-5
SOT-23-5
SOT-23-3/SOT-89-3
SOT-23-3
SOT-23-5
SOT-23-5
SOT-23-3/SOT-89-3
SOT-23-5
Applications
Application requiring a shutdown function
Application not requiring a shutdown function
For pagers
Application in which the output voltage is adjusted by external resistor
Application requiring a shutdown function and a thin coil
Application not requiring a shutdown function but requiring a thin coil.
Application in which the output voltage is adjusted by external resistor and requiring a thin coil
Application requiring a shutdown function
Application not requiring a shutdown function
For pagers
Application in which the output voltage is adjusted by external resistor
Application requiring a shutdown function and a thin coil
Application not requiring a shutdown function but requiring a thin coil.
Application in which the output voltage is adjusted by external resistor and requiring a thin coil
29
POWER SUPPLY ICs
SELECTION GUIDE
• S-8353 series
Item
Output voltage
2.0V
2.5V
2.7V
2.8V
3.0V
3.1V
3.3V
3.8V
4.0V
4.5V
5.0V
S-8353AxxMC
series
S-8353A20MC-IQF-T2
S-8353A25MC-IQK-T2
S-8353A27MC-IQM-T2
S-8353A28MC-IQN-T2
S-8353A30MC-IQP-T2
-
S-8353A33MC-IQS-T2
S-8353A38MC-IQX-T2
-
-
S-8353A50MC-IRJ-T2
S-8353AxxMA
series
-
-
-
-
S-8353A30MA-IQP-T2
-
S-8353A33MA-IQS-T2
-
-
-
S-8353A50MA-IRJ-T2
S-8353AxxUA
series
-
-
-
-
-
-
S-8353A33UA-IQS-T2
-
-
-
S-8353A50UA-IRJ-T2
S-8353CxxMA
series
-
-
-
-
S-8353C30MA-IPS-T2
-
-
-
-
-
-
S-8353DxxMC
series
S-8353D20MC-IUF-T2
-
-
-
S-8353D30MC-IUP-T2
-
-
-
-
-
S-8353D50MC-IVJ-T2
S-8353HxxMC
S-8353JxxMC
series
series
-
S-8353J20MC-IYF-T2
-
S-8353J25MC-IYK-T2
-
-
-
-
S-8353H30MC-IWP-T2
-
S-8353H31MC-IWQ-T2
-
S-8353H33MC-IWS-T2
-
S-8353H38MC-IWX-T2
-
S-8353H40MC-IWZ-T2
-
S-8353H45MC-IXE-T2
-
S-8353H50MC-IXJ-T2 S-8353J50MC-IZJ-T2
• S-8354 series
Item
Output voltage
2.0V
2.7V
3.0V
3.3V
4.0V
5.0V
S-8354AxxMC
series
-
S-8354A27MC-JQM-T2
S-8354A30MC-JQP-T2
S-8354A33MC-JQS-T2
S-8354A40MC-JQZ-T2
S-8354A50MC-JRJ-T2
S-8354AxxMA
S-8354AxxUA
series
series
-
-
S-8354A27MA-JQM-T2
-
S-8354A30MA-JQP-T2 S-8354A30UA-JQP-T2
S-8354A33MA-JQS-T2 S-8354A33UA-JQS-T2
-
-
S-8354A50MA-JRJ-T2 S-8354A50UA-JRJ-T2
S-8354DxxMC
series
S-8354D20MC-JUF-T2
-
-
-
-
-
S-8354HxxMC
S-8354JxxMC
series
series
-
-
-
-
S-8354H30MC-JWP-T2
-
S-8354H33MC-JWS-T2
-
-
-
S-8354H50MC-JXJ-T2 S-8354J50MC-JZJ-T2
Remark
Please contact our sales office if you desire a product with an output voltage other than those shown above.
BLOCK DIAGRAM AND CIRCUIT CONNECTION EXAMPLE
1. Without shutdown function
S-8353AxxMA/UA, S-8353CxxMA, S-8353HxxMA/UA
S-8354AxxMA/UA, S-8354CxxMA, S-8354HxxMA/UA
2. With shutdown function
S-8353AxxMC, S-8353HxxMC
S-8354AxxMC, S-8354HxxMC
SD
L
VOUT
SD
L
CONT
Oscillation circuit
IC internal
power supply
V
IN
+
–
C
IN
PWM or PWM/PFM
switching control
circuit
Soft start built-in
reference power
supply
+
–
CONT
Oscillation circuit
VOUT
IC internal
power supply
V
IN
+
–
C
L
VSS
+
–
C
IN
PWM or PWM/PFM
switching control
circuit
Soft start built-in
reference power
supply
+
–
+
–
C
L
VSS
Phase
compensation
circuit
Phase
compensation
circuit
ON/OFF
Remark
The positive power supply pin of the circuits in the IC is VOUT.
Remark
The positive power supply pin of the circuits in the IC is VOUT.
3. VDD/VOUT separate type (variable output voltage type)
S-8353DxxMC, S-8353JxxMC
S-8354DxxMC, S-8354JxxMC
SD
L
CONT
VDD
Oscillation circuit
IC
internal
power
supply
+
–
C
C
R
A
+
VOUT
R
B
VSS
–
C
L
V
IN
+
–
C
IN
PWM or PWM/PFM
switching control
circuit
Soft start built-in
reference power
supply
Phase
compensation
circuit
Remark
The positive power supply pin of the circuits in the IC is VDD.
30
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