Contents
Features.............................................................
Applications........................................................
Block Diagram ...................................................
Selection Guide..................................................
Pin Assignment..................................................
Absolute Maximum Ratings ...............................
Electrical Characteristics ...................................
Measurement Circuits........................................
Operation ...........................................................
Recommended Selection of Series Products
and External Parts .................... 12
Standard Circuits ............................................... 15
Design Precautions............................................ 16
Application Circuits ............................................ 17
Dimensions ........................................................ 19
Marking .............................................................. 19
Taping................................................................ 20
Temperature Characteristics ............................. 21
Power Supply Dependency Characteristics....... 21
Transitory Response Characteristics................. 23
Reference Data.................................................. 26
Frequently Asked Questions.............................. 31
1
1
1
2
2
2
3
7
8
Rev.2.8
STEP-UP SWITCHING REGULATOR
FOR LCD BIAS SUPPLY
S-8330/8331 Series
The S-8330/8331 Series is a CMOS PWM-control step-up switching
regulator which mainly consists of a reference voltage source, an
oscillation circuit, a power MOS FET (for S-8330 Series) , and an error
amplifier. The output voltage can adjust by built-in Electric volume circuit
, and equip with shutdown function. The S-8330 Series is low current
consumption because of CMOS structure , and a step-up switching
regulator constructed by externally connecting only a coil, a capacitor
and a diode. This feature, along with its 8-Pin SSOP package and a few
external components, makes the S-8330 Series ideal for LCD bias
generators of portable equipment. For applications requiring a high
output current, products used with an external transistor (S-8331 Series)
are also available.
Features
Applications
Power supplies for medium type or large type
Maximum output voltage: 20 V to 30 V (2 V step)
12 V range can be adjusted by electric volume
LCD panel.
Power supplies for portable devices such as
Output current: 5mA ( V
IN
= 5 V,V
OUT
= 30 V)
Low current consumption :
During operation: 100
A (typ.) (V
IN
= 5 V 180 kHz)
During shutdown : 1.0
A (max.)
pagers, handy calculators, and remote controllers
Constant voltage power supplies for cameras,
video equipment, and communications equipment
Shutdown function: Stepping up operation is stopped ,
and Vout pin is shorted to GND while shutdown.
Input voltage range: 2.0 to 9.0 V
Soft start function: 3 msec (typ.)
Built-in CR oscillation circuit:
Oscillating frequency: 180 kHz (typ.) (A series)
Oscillating frequency: 50 kHz (typ.) (B series)
8-pin SSOP plastic package
8-bit built-in electric volume circuit
External transistor type is available (S-8331 Series)
Block Diagram
(1) S-8330 Series
L
CONT
V
OUT
+
V
IN
PWM
Control
Circuit
+
-
VDIN
VCLK
VSTRB
External
Transistor
(2)
SD
S-8331 Series
L
V
IN
CL
-
Rb
Cb
EXT
CR Oscillation
Circuit
V
REF
RESET
V
SS
ON/OFF
Figure 1 Block Diagram
Seiko Instruments Inc.
1
STEP-UP SWITCHING REGULATOR FOR LCD BIAS SUPPLY
S-8330/8331
Series
Rev.2.8
Selection Guide
1. Product Name
S
-
833 X X XX FS
-
T2
Tape Specification
Package name (abbreviation)
Maximum Output voltage
Product category
A: fosc=180kHz
B: fosc= 50kHz
Power transistor
0: Built-in switch.
1: External transistor.
2. Product list
Output voltage range (V)
8 to 20
10 to 22
12 to 24
14 to 26
16 to 28
18 to 30
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
Pin Assignment
8-pin SSOP
Top view
1
2
3
4
8
7
6
5
Functions
Electric volume data input pin
Electric volume clock input pin
Electric volume strobe signal input pin
Output voltage pin
Power supply pin
External inductor connection pin (Note 1)
External transistor connection pin (Note 2 )
Shutdown pin
7
“H”:normal operation
(stepping up operation)
“L”:stop stepping up operation
8
V
SS
GND pin
Note 1: S-8330 Series: Open drain output
Note 2: S-8331 Series: CMOS output
Pin No.
1
2
3
4
5
6
Pin name
VDIN
VCLK
VSTRB
V
OUT
V
IN
CONT
EXT
ON/OFF
Figure 2 Pin Assignment
Absolute Maximum Ratings
Note:
Built-in protect circuit for static electricity on chip.
However, prevent a charge of static electricity which exceeds the capacity of the protection circuit.
(Unless otherwise specified: Ta=25°C)
Parameter
V
OUT
pin voltage
CONT pin voltage
CONT pin current
EXT pin voltage
EXT pin current
Input voltage
Power dissipation
Operating temperature range
Storage temperature range
Symbol
VOUT
VCONT
ICONT
VEXT
IEXT
VIN,VCLK,VDIN,
VSTRB,ON/OFF
PD
TOPR
TSTG
Ratings
V
SS
-0.3 to 33
V
SS
-0.3 to 33
300
V
SS
-0.3 to VOUT+0.3
±50
V
SS
-0.3 to 10
300
-20 to +70
-40 to +125
Unit
V
V
mA
V
mA
V
mW
°C
°C
2
Seiko Instruments Inc.
Rev.2.8
STEP-UP SWITCHING REGULATOR FOR LCD BIAS SUPPLY
S-8330/8331
Series
Electrical Characteristics
1. S-8330A Series
Step-Up Switching Regulator
Items
Symbols
S-8330A20FS
S-8330A22FS
Output voltage range
VOUT
S-8330A24FS
S-8330A26FS
S-8330A28FS
S-8330A30FS
Input voltage
Current consumption 1
Current consumption 2
Current consumption during power off
VIN
ISS1
ISS2
ISSS
V
IN
=5V, V
OUT
= Output voltage Max.
V
IN
=2V, V
OUT
= Output voltage Min.
Power off pin
=VDATA=0V,V
IN
=VCLK=VSTRB=5V
Switching current
Switching transistor leakage current
ISW
ISWQ
VCONT=0.4V
Power off pin =0V , VCONT=9V
S-8330A20FS
S-8330A22FS
Line regulation
VOUT1
(Unless otherwise specified: Ta=25
C)
Conditions
Min.
8
10
12
14
16
18
2.0
—
—
—
Typ.
—
—
—
—
—
—
—
100
50
—
Max.
20
22
24
26
28
30
9.0
200
100
1.0
V
A
A
A
Unit
Mea.Circ.
V
5
2
4
4
4
100
—
—
—
—
—
—
—
—
200
—
±300
±330
±360
±390
±420
±450
±30
—
1.0
—
—
—
—
—
—
—
mA
A
—
3
V
IN
=3V to 6V
S-8330A24FS
S-8330A26FS
S-8330A28FS
S-8330A30FS
mV
5
Load regulation
VOUT2
V
IN
=5V
I
OUT
=output voltage/2.4M
to
output voltage/24k
S-8330A20FS
S-8330A22FS
mV
5
—
—
—
—
—
—
144
±1.0
±1.1
±1.2
±1.3
±1.4
±1.5
180
—
—
—
—
—
—
216
kHz
2
mV
/
C
5
Output voltage temperature coefficient
VOUT
Ta= -20
C to 70
C
S-8330A24FS
S-8330A26FS
S-8330A28FS
S-8330A30FS
/
Ta
Oscillating frequency
fosc
V
OUT
=output voltage
0.95
Measure waveform at CONT pin
Maximum duty ratio
Max Duty V
OUT
=output voltage
0.95
Measure waveform at CONT pin
VSH1
V
OUT
=output voltage
0.95
V
IN
3.0V
60
72
84
2
2.4
1.6
—
—
—
—
—
—
0.4
V
2
Power off terminal
input voltage
VSH2
VSL
Check oscillation at CONT pin V
IN
3.0V
V
OUT
=output voltage
0.95
Check oscillation stop at CONT pin
Power off terminal
input leakage current
Soft start time
Efficiency
Externally attached parts:
Coils
Diodes
ISL
V
IN
=9V
-1
—
1
A
1
TSS
EFFI
1
—
3
85
6
—
ms
—
5
CD54 (47
H) of Sumida Electric Co., Ltd.
MA720 Schottky type of Matsushita Electronic Components Co., Ltd.
Capacitors
F93 tantalum type (two circuits of 50V, 4.7
F are connected in parallel) of Nichicon Corporation
V
IN
=5V, V
OUT
=VOUT Max. I
OUT
= output voltage /24k
ON/OFF=5V,VDATA=VCLK=VSTRB=0V
Note: Output voltage specified above is the typical value of the output voltage.
Seiko Instruments Inc.
3
STEP-UP SWITCHING REGULATOR FOR LCD BIAS SUPPLY
S-8330/8331
Series
2. S-8330B Series
Step-Up Switching Regulator
Item
Symbol
S-8330B20FS
S-8330B22FS
Output voltage range
VOUT
S-8330B24FS
S-8330B26FS
S-8330B28FS
S-8330B30FS
Input voltage
Current consumption 1
Current consumption 2
Current consumption during power off
VIN
ISS1
ISS2
ISSS
V
IN
=5V, V
OUT
=Output voltage Max.
V
IN
=2V, V
OUT
=Output voltage Min.
Power off pin
=VDATA=0V,V
IN
=VCLK=VSTRB=5V
Switching current
Switching transistor leakage current
ISW
ISWQ
VCONT=0.4V
Power off pin=0V , VCONT=9V
S-8330B20FS
S-8330B22FS
Line regulation
VOUT1
Rev.2.8
(Unless otherwise specified: Ta=25
C)
Conditions
Min.
8
10
12
14
16
18
2.0
—
—
—
Typ.
—
—
—
—
—
—
—
40
20
—
Max.
20
22
24
26
28
30
9.0
80
40
1.0
V
A
A
A
Unit
Mea. Cir.
V
5
2
4
4
4
100
—
—
—
—
—
—
—
—
200
—
±300
±330
±360
±390
±420
±450
±30
—
1.0
—
—
—
—
—
—
—
mA
A
—
3
V
IN
=3V to 6V
S-8330B24FS
S-8330B26FS
S-8330B28FS
S-8330B30FS
mV
5
Load regulation
VOUT2
V
IN
=5V
I
OUT
=Output voltage/2.4M
to
Output voltage/24k
S-8330B20FS
S-8330B22FS
mV
5
—
—
—
—
—
—
40
±1.0
±1.1
±1.2
±1.3
±1.4
±1.5
50
—
—
—
—
—
—
60
kHz
2
mV
/
C
5
Output voltage Temperature coefficient
VOUT
Ta=-20
C to +70
C
S-8330B24FS
S-8330B26FS
S-8330B28FS
S-8330B30FS
/
Ta
Oscillating frequency
fosc
V
OUT
=Output voltage
0.95
Measure waveform at CONT pin
Maximum duty ratio
Max Duty V
OUT
=Output voltage
0.95
Measure waveform at CONT pin
VSH1
V
OUT
=Output voltage
0.95
V
IN
3.0V
60
72
84
%
2
2.4
1.6
—
—
—
—
—
—
0.4
V
2
Power off pin
Input voltage
VSH2
VSL
Check oscillation at CONT pin V
IN
3.0V
V
OUT
=Output voltage
0.95
Check oscillation stop at CONT pin
Power off pin
Input leakage current
Soft start time
Efficiency
Externally attached parts:
Coils
Diodes
ISL
V
IN
=9V
-1
—
1
A
1
TSS
EFFI
3
—
10
85
20
—
ms
%
—
5
CD54 (47
H) of Sumida Electric Co., Ltd.
MA720 Schottky type of Matsushita Electronic Components Co., Ltd.
Capacitors
F93 tantalum type (two circuits of 50V, 4.7
F are connected in parallel) of Nichicon Corporation
V
IN
=5V,V
OUT
=VOUT Max. I
OUT
= output voltage /24k
ON/OFF=5V,VDATA=VCLK=VSTRB=0V
Note: Output voltage specified above is the typical value of the output voltage.
4
Seiko Instruments Inc.
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