POWER SUPPLY ICs
STEP-UP SWITCHING REGULATOR
FOR LCD BIAS SUPPLY
The S-8330/8331 series is a CMOS PWM-control step-up
switching regulator that consists of a reference voltage
source, an oscillation circuit, a power MOS FET (for the S-
8330 series), and an error amplifier. The output voltage can
be adjusted by electronic volume. A shutdown function is
also available. The S-8330 series features low current con-
sumption due to the CMOS structure, and a step-up switch-
ing regulator can be constructed simply by externally con-
necting a coil, capacitors and a diode. The compact 8-pin
SSOP package and small number of external components
make the S-8330 series ideal for LCD bias generators in
portable equipment. For applications requiring a high output
current, the external transistor controller type S-8331 series
is also available.
S-8330/8331 series
FEATURES
• Maximum output voltage: 20 V to 30 V (2 V steps)
12 V range can be adjusted by electronic volume
• Output current:
5 mA (V
IN
= 5 V, V
OUT
= 30 V)
• Low current consumption:
100
µA
typ. (180 kHz product, V
IN
= 5 V, during operation)
1.0
µA
max. (during power-off)
• Shutdown function: Stepping up operation is stopped, and VOUT
pin is shorted to GND at shutdown.
• Input voltage range: 2.0 to 9.0 V
• Soft start function
• Built-in CR oscillation circuit: 180 kHz typ. (A series)
50 kHz typ. (B series)
• Package:
8-pin SSOP
• Built-in 8-bit electronic volume
• External transistor type is available (S-8331 series)
APPLICATIONS
• Power supply for medium-sized or large-sized LCD panels.
• Power supply for portable equipment such as pagers, pocket cal-
culators, electronic organizers, and remote controllers.
• Constant voltage power supply for cameras, video equipment, and
communications equipment.
Pin No. Pin name
1
VDIN
2
VCLK
3
VSTRB
4
VOUT
5
VIN
6
CONT
Description
Electric volume data input pin
Electric volume clock input pin
Electric volume strobe signal input pin
Output voltage monitor pin
Power supply pin
External inductor connection pin
(S-8330 series: Open drain output)
EXT
External transistor connection pin
(S-8331 series: Push-pull (CMOS output))
ON / OFF Shutdown pin
"H": Normal operation (stepping up operation)
"L": Stepping up stopped
VSS
GND pin
PIN CONFIGURATION
8-pin SSOP
Top view
1
2
3
4
8
7
6
5
7
8
SELECTION GUIDE
Output voltage
range (V)
8 to 20V
10 to 22V
12 to 24V
14 to 26V
16 to 28V
18 to 30V
S-8330AXXFS
series
S-8330A20FS-T2
S-8330A22FS-T2
S-8330A24FS-T2
S-8330A26FS-T2
S-8330A28FS-T2
S-8330A30FS-T2
S-8330BXXFS
series
S-8330B20FS-T2
S-8330B22FS-T2
S-8330B24FS-T2
S-8330B26FS-T2
S-8330B28FS-T2
S-8330B30FS-T2
S-8331AxxFS
series
S-8331A20FS-T2
S-8331A22FS-T2
S-8331A24FS-T2
S-8331A26FS-T2
S-8331A28FS-T2
S-8331A30FS-T2
(2000/reel)
S-8331BxxFS
series
S-8331B20FS-T2
S-8331B22FS-T2
S-8331B24FS-T2
S-8331B26FS-T2
S-8331B28FS-T2
S-8331B30FS-T2
BLOCK DIAGRAM AND CIRCUIT CONNECTION EXAMPLE
S-8330 series
L
CONT
SD
VOUT
S-8331 series
L
VDIN
VIN
PWM
controller
+
–
VCLK
VSTRB
+
–
CL
VIN
C
IN
CR oscillation
circuit
V
REF
VSS
ON/OFF
C
IN
External
Tr
RESET
Rb
Cb
EXT
36
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