SMALL-PACKAGE PWM/PFM 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 control scheme
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-8324 Series. These features, along with its small package
and low current consumption, make the S-8324 Series ideal
as a power supply for portable equipment needed high ef-
ficiency. For applications requiring a high output current,
the S-8328 Series is also available with an external transis-
tor. For making an external coil smaller, high frequency type
(250kHz) is also available.
S-8324/8328 Series
• Low voltage operation : 0.9V (Iout=1mA)
: 1.4V (H,J Series)
• Low current consumption
Operation
: 17.2µA typ. (Vout=3V 50kHz)
: 59.4µA typ.(S-8328H33)
Shutdown
: 0.5µA max.
• Low input current : 10.4µA typ. (Vout=3V 50kHz, no load)
• Duty ratio
: Auto-switching PFM/PWM control circuit
During PWM control : 15 to 83% typ. (15 to 73% : H,J Series)
During PFM control : 15% typ.
• External components
: Coil, Diode, Capacitors
• Output voltage : accurate to
±2.4%
• Oscillation frequency : 30kHz, 50kHz, 100kHz, 250kHz,
• Built-in soft start function
• Shutdown function
• Large output currents can be obtained with an external transistor
(S-8328 Series)
• Small package
: SOT-23-5, SOT-23-3, SOT-89-3
• Step-down and inverting type can be also made.
FEATURES
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
4
2
PIN CONFIGURATIONS
5
SOT-23-5
Top view
1
2
3
SOT-23-3
Top view
1
3
SOT-89-3
Top view
1
2
3
S-8324AXXMC/S-8328BXXMC/S-8324HXXMC/S-8328HXXMC
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-8324 Series)
External transistor connection
pin (for S-8328 Series)
S-8324DXXMC/S-8328EXXMC/S-8324JXXMC/8328JXXMC
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-8324 Series)
External transistor connection
pin (for S-8328 Series)
1
ON / OFF
2
3
4
V
OUT
-
V
SS
CONT
5
EXT
S-8324AXXMA/S-8324AXXUA/S-8324CXXMA
S-8328BXXMA/S-8328BXXUA
SOT-23-3, SOT-89-3
Pin No.
1
2
Pin Name
V
SS
V
OUT
CONT
EXT
GND pin
Output voltage pin
and power supply pin
External inductor connection
pin (for S-8324 Series)
External transistor connection
pin (for S-8328 Series)
Functions
3
SELECTION GUIDE
Product Name
S-8324AXXMC
S-8324AXXMA
S-8324AXXUA
S-8324DXXMC
S-8324CXXMA
S-8328BXXMC
S-8328BXXMA
S-8328BXXUA
S-8328EXXMC
S-8324HXXMC
S-8324JXXMC
S-8328HXXMC
S-8328JXXMC
-
-
-
-
-
-
-
-
Switching
Built in Power
with external
power transistor frequency(kHz)
transistor
-
-
-
-
-
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
15
POWER SUPPLY
PRODUCT LIST
Item
Output Voltage (V)
2.0
2.5
2.7
2.8
3.0
3.3
5.0
Item
Output Voltage (V)
2.0
2.5
2.7
3.0
3.3
3.6
3.8
5.0
5.2
S-8324AXXMC
Series
-
S-8324AXXMA
Series
-
S-8324AXXUA
Series
-
S-8324CXXMA
Series
-
S-8324DXXMC
Series
S-8324D20MC-E2A-T2
-
-
-
S-8324HXXMC
Series
-
-
-
-
-
-
-
S-8324JXXMC
Series
S-8324J20MC-FUA-T2
-
-
-
-
-
S-8324J50MC-FVE-T2
S-8328JXXMC
Series
-
-
-
-
-
-
-
S-8328J50MC-F3E-T2
-
S-8324A25MC-EOF-T2 S-8324A25MA-EOF-T2 S-8324A25UA-EOF-T2 S-8324C25MA-EQF-T2
S-8324A27MC-EOH-T2 S-8324A27MA-EOH-T2 S-8324A27UA-EOH-T2 S-8324C27MA-EQH-T2
S-8324A28MC-EOI-T2
-
-
-
S-8324A30MC-EOK-T2 S-8324A30MA-EOK-T2 S-8324A30UA-EOK-T2 S-8324C30MA-EQK-T2 S-8324D30MC-E2K-T2
S-8324A33MC-EON-T2 S-8324A33MA-EON-T2 S-8324A33UA-EON-T2
S-8324A50MC-EPE-T2 S-8324A50MA-EPE-T2 S-8324A50UA-EPE-T2
S-8328BXXMC
Series
-
S-8328B25MC-EWF-T2
S-8328B27MC-EWH-T2
S-8328B30MC-EWK-T2
S-8328B33MC-EWN-T2
S-8328B36MC-EWQ-T2
S-8328B38MC-EWS-T2
S-8328B50MC-EXE-T2
S-8328B52MC-EXG-T2
S-8328BXXMA
Series
-
S-8328B25MA-EWF-T2
S-8328B27MA-EWH-T2
S-8328B30MA-EWK-T2
S-8328B33MA-EWN-T2
-
-
S-8328B50MA-EXE-T2
-
S-8328BXXUA
Series
-
S-8328B25UA-EWF-T2
S-8328B27UA-EWH-T2
S-8328B30UA-EWK-T2
S-8328B33UA-EWN-T2
-
-
S-8328B50UA-EXE-T2
-
-
-
-
S-8324D50MC-E4E-T2
S-8328EXXMC
Series
S-8328E20MC-EYA-T2
-
-
-
-
-
-
S-8328E50MC-E9E-T2
-
S-8328HXXMC
Series
-
-
-
-
-
-
-
-
-
Please ask an SII representative if you need another output voltage product.
BLOCK DIAGRAM
(1) S-8324AXXMC, S-8324HXXMC
SD
(4) S-8328BXXMA, S-8328BXXUA
V
OUT
L
SD
V
OUT
L
CONT
V
OUT
VREF
V
IN
+
-
+
VREF
V
IN
+
-
2200pF
+
C
IN
PWM/PFM
Control
circuit
+
-
-
C
OUT
C
IN
1kΩ
EXT
PWM/PFM
Control
circuit
+
-
-
C
OUT
V
SS
Soft start circuit
ON/OFF
Soft start circuit
V
SS
(2) S-8328BXXMC, S-8328HXXMC
L
SD
V
OUT
(5) S-8324DXXMC, S-8324JXXMC
(Output voltage adjustment circuit with external resistors)
V
CC
L
CONT
SD
V
DD
C
C
R
A
+
VREF
V
IN
+
-
2200pF
VREF
V
IN
+
-
C
IN
1kΩ
EXT
PWM/PFM
Control
circuit
+
-
-
C
OUT
V
OUT
PWM/PFM
Control
circuit
+
-
+
-
C
IN
R1
R2
V
SS
C
OUT
R
B
V
SS
Soft start circuit
ON/OFF
Soft start circuit
(3) S-8324AXXMA, S-8324AXXUA, S-8324CXXMA
(6) S-8328EXXMC, S-8328JXXMC
(Output voltage adjustment circuit with external resistors)
L
CONT
SD
V
OUT
L
SD
V
DD
C
C
R
A
V
CC
VREF
V
IN
VREF
+
-
+
V
IN
+
-
2200pF
V
OUT
EXT
PWM/PFM
Control
circuit
+
-
+
-
C
IN
PWM/PFM
Control
circuit
+
-
-
C
OUT
C
IN
1kΩ
R1
R2
V
SS
C
OUT
R
B
Soft start circuit
V
SS
Soft start circuit
16
15
测试/测量
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
