SMALL-PACKAGE PWM CONTROL STEP-UP
SWITCHING REGULATOR
Consisting of a reference voltage source, an oscillation cir-
cuit, a power MOSFET and an error amplifier, this series of
devices offer high efficiency over a wide range because the
control circuit has the ability to change the duty ratio between
0% and 83% according to the load.
A step-up switching regulator can be constructed by exter-
nally connecting only a coil, a capacitor and a diode to the
S-8323 Series. These features, along with its small package
and low current consumptions, make the S-8323 Series ideal
as a power supply for portable equipment requiring low
noise. For applications requiring a high output current, the
S-8327 Series is also available with an external transistor.
For making an external coil smaller, high frequency type
(250kHz) is also available.
S-8323/8327 Series
FEATURES
• Low voltage operation
• Low current consumption
Operation
•
•
•
•
•
•
•
: 0.9V(Iout=1mA)
: 1.4V(H,J Series)
:
:
:
:
:
:
:
17.2µA typ.(Volt=3V, 50kHz)
59.4µA typ.(S-8327H33)
0.5µA max.
Built-in PWM controlled circuit
Coil, Diode, Capacitors
accurate to
±2.4%
30kHz, 50kHz, 100kHz, 250kHz
Shutdown
Duty ratio
External components
Output voltage
Oscillation frequency
Built-in soft start function
Shutdown function
Large output currents can be obtained with an external transistor
(S-8327 Series)
• Small Package
: SOT-23-5, SOT-23-3, SOT-89-3
• Step-down and inverting type can be also made.
APPLICATIONS
• Power supplies for portable equipment such as pagers, handy
calculators, and remote controllers
• Constant voltage power supplies for cameras, video equipment,
and communications equipment
• Power supply for microcomputers
2
PIN CONFIGURATIONS
5
4
SOT-23-5
Top view
1
2
3
SOT-23-3
Top view
1
3
SOT-89-3
Top view
1
2
3
S-8323AXXMC/S-8327BXXMC/S-8323HXXMC/S-8327HXXMC
SOT-23-5
Pin No.
Pin Name
Functions
Shutdown pin
"H" : nomal operation
(stepping up operation)
"L" : stop stepping up
(whole circuit stop)
Output voltage pin
and power supply pin
N.C. (Non Connection)
GND pin
External inductor connection
pin (for S-8323 Series)
External transistor connection
pin (for S-8327 Series)
S-8323DXXMC/S-8327EXXMC/S-8323JXXMC/S-8327JXXMC
SOT-23-5
Pin No.
1
2
3
4
Pin name
V
OUT
V
DD
-
V
SS
CONT
5
EXT
Functions
Output voltage pin
Power supply pin
N.C. (Non Connection)
GND pin
External inductor connection
pin (for S-8323 Series)
External transistor connection
pin (for S-8327 Series)
1
ON / OFF
2
3
4
5
V
OUT
-
V
SS
CONT
EXT
S-8323AXXMA/S-8323AXXUA/S-8323CXXMA
S-8327BXXMA/S-8327BXXUA
SOT-23-3, SOT-89-3
Pin No.
1
2
Pin Name
V
SS
V
OUT
CONT
3
EXT
Functions
GND pin
Output voltage pin
and power supply pin
External inductor connection
pin (for S-8323 Series)
External transistor connection
pin (for S-8327 Series)
SELECTION GUIDE
Product Name
S-8323AXXMC
S-8323AXXMA
S-8323AXXUA
S-8323DXXMC
S-8323CXXMA
S-8327BXXMC
S-8327BXXMA
S-8327BXXUA
S-8327EXXMC
S-8323HXXMC
S-8323JXXMC
S-8327HXXMC
S-8327JXXMC
-
-
-
-
-
-
-
-
Built in Power
transistor
with external
Switching
power trasistor frequency(kHz)
-
-
-
-
-
50
50
50
50
30
100
100
100
100
250
250
250
250
-
-
-
-
-
-
-
Shutdown
function
-
-
-
-
-
-
-
-
-
V
DD
/V
OUT
separate type
-
-
-
Package
SOT-23-5
SOT-23-3
SOT-89-3
SOT-23-5
SOT-23-3
SOT-23-5
SOT-23-3
SOT-89-3
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
With a shutdown function
Without shutdown function
Without shutdown function
For variable output voltage by step-up DC/DC converter and step-down,
inverted output DC/DC converter with an external resister
For pagers
For large load current with shutdown function
For large load current without shutdown function
For large load current without shutdown function
For variable output voltage by step-up DC/DC converter with an external resister
For making external parts smaller with a shutdown function
For variable output voltage by step-up DC/DC converter and step-down,
inverted output DC/DC converter with an external resister
For large load current without shutdown function
For variable output voltage by step-up DC/DC converter with an external resister
Application
11
POWER SUPPLY
PRODUCT LIST
Item
Output Voltage (V)
2.0
2.5
2.7
3.0
3.3
5.0
5.2
Item
Output Voltage (V)
2.0
2.5
2.7
2.8
3.0
3.3
3.6
5.0
5.4
S-8323AXXMC
Series
-
S-8323AXXMA
Series
-
S-8323AXXUA
Series
-
S-8323CXXMA
Series
-
S-8323DXXMC
Series
S-8323D20MC-EZA-T2
-
-
S-8323HXXMC
Series
-
-
-
-
-
-
-
S-8327HXXMC
Series
-
-
-
-
-
S-8327H33MC-FWN-T2
-
S-8327H50MC-FXE-T2
-
S-8323JXXMC
Series
S-8323J20MC-FQA-T2
-
-
-
-
-
-
S-8327JXXMC
Series
-
-
-
-
-
-
-
-
-
S-8323A25MC-ELF-T2 S-8323A25MA-ELF-T2
S-8323A25UA-ELF-T2 S-8323C25MA-ENF-T2
S-8323A27MC-ELH-T2 S-8323A27MA-ELH-T2 S-8323A27UA-ELH-T2 S-8323C27MA-ENH-T2
S-8323A30MC-ELK-T2 S-8323A30MA-ELK-T2
S-8323A30UA-ELK-T2 S-8323C30MA-ENK-T2 S-8323D30MC-EZK-T2
-
-
-
S-8327BXXUA
Series
-
S-8327B25UA-ERF-T2
S-8327B27UA-ERH-T2
S-8327EXXMC
Series
S-8327E20MC-EVA-T2
-
-
-
S-8327B30UA-ERK-T2
S-8327B33UA-ERN-T2
-
S-8327B50UA-ESE-T2
-
-
-
-
S-8327E50MC-EKE-T2
-
-
S-8323D50MC-E3E-T2
-
S-8323A33MC-ELN-T2 S-8323A33MA-ELN-T2 S-8323A33UA-ELN-T2
S-8323A50MC-EME-T2 S-8323A50MA-EME-T2 S-8323A50UA-EME-T2
S-8323A52MC-EMG-T2
S-8327BXXMC
Series
-
S-8327B25MC-ERF-T2
S-8327B27MC-ERH-T2
S-8327B28MC-ERI-T2
S-8327B30MC-ERK-T2
S-8327B33MC-ERN-T2
S-8327B36MC-ERQ-T2
S-8327B50MC-ESE-T2
S-8327B54MC-ESI-T2
-
S-8327BXXMA
Series
-
S-8327B25MA-ERF-T2
S-8327B27MA-ERH-T2
-
S-8327B30MA-ERK-T2
S-8327B33MA-ERN-T2
-
S-8327B50MA-ESE-T2
-
-
Please ask an SII representative if you need another output voltage product.
BLOCK DIAGRAM
(1) S-8323AXXMC, S-8323HXXMC
L
SD
V
OUT
(4) S-8327BXXMA, S-8327BXXUA
V
OUT
L
SD
V
OUT
CONT
VREF
V
IN
+
-
+
VREF
V
IN
+
-
2200pF
C
IN
PWM
Control
circuit
+
+
-
-
C
OUT
C
IN
1kΩ
EXT
PWM
Control
circuit
+
-
-
C
OUT
V
SS
Soft start circuit
ON/OFF
Soft start circuit
V
SS
(2) S-8327BXXMC, S-8327HXXMC
L
SD
(5) S-8323DXXMC, S-8323JXXMC
(Output voltage adjustment circuit with external resistors)
V
OUT
L
CONT
SD
V
DD
C
C
R
A
V
CC
VREF
V
IN
+
-
2200pF
VREF
+
C
IN
1kΩ
EXT
PWM
Control
circuit
+
-
-
V
IN
+
-
V
OUT
PWM
Control
circuit
+
-
+
-
C
OUT
C
IN
R1
R2
V
SS
C
OUT
R
B
V
SS
Soft start circuit
ON/OFF
Soft start circuit
(3) S-8323AXXMA, S-8323AXXUA, S-8323CXXMA
(6) S-8327EXXMC, S-8327JXXMC
(Output voltage adjustment circuit with external resistors)
L
CONT
SD
V
OUT
V
CC
L
SD
V
DD
C
C
R
A
+
VREF
V
IN
+
-
VREF
V
IN
+
-
C
IN
PWM
Control
circuit
+
-
-
2200pF
V
OUT
EXT
PWM
Control
circuit
+
-
C
OUT
+
-
C
IN
1kΩ
R1
R2
V
SS
C
OUT
R
B
Soft start circuit
V
SS
Soft start circuit
12
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