Rev.4.1
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.
T
Features
•
•
•
•
Maximum output voltage: 20 V to 30 V (2 V step)
12 V range can be adjusted by electric volume
Output voltage accuracy :±2.4%
Output current: 5mA ( V
IN
= 5 V,V
OUT
= 30 V)
Low current consumption :
During operation: 100
µA
(typ.) (V
IN
= 5 V 180 kHz)
During shutdown : 1.0
µA
(max.)
•
•
•
•
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)
T
Applications
•
Power supplies for medium type or large type
LCD panel.
•
Power supplies for portable devices such as
pagers, handy calculators, and remote controllers
•
Constant voltage power supplies for cameras,
video equipment, and communications equipment
T
Package
8-pin SSOP plastic package (PKG drawing code : FS008-A)
Seiko Instruments Inc.
1
STEP-UP SWITCHING REGULATOR FOR LCD BIAS SUPPLY
S-8330/8331
Series
Rev.4.1
T
Block Diagram
L
CONT
V
OUT
+
V
IN
PWM
Control
Circuit
+
-
VDIN
VCLK
VSTRB
External
Transistor
SD
L
V
IN
CL
-
Rb
Cb
EXT
CR Oscillation
Circuit
V
REF
RESET
V
SS
ON/OFF
(1) S-8330 Series
Figure 1 Block Diagram
(2)
S-8331 Series
T
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
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
Output voltage range (V)
2
Seiko Instruments Inc.
Rev.4.1
STEP-UP SWITCHING REGULATOR FOR LCD BIAS SUPPLY
S-8330/8331
Series
T
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
ON/OFF “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
Figure 2 Pin Assignment
T
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
Seiko Instruments Inc.
3
STEP-UP SWITCHING REGULATOR FOR LCD BIAS SUPPLY
S-8330/8331
Series
Rev.4.1
T
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
Output voltage accuracy
Input voltage
Current consumption 1
Current consumption 2
VIN
ISS1
ISS2
ISSS
V
IN
=5V, V
OUT
= Output voltage Max.
V
IN
=2V, V
OUT
= Output voltage Min.
Power off pin
=VDIN=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
V
IN
=3V to 6V
S-8330A24FS
S-8330A26FS
S-8330A28FS
S-8330A30FS
Load regulation
∆VOUT2
V
IN
=5V
I
OUT
=output voltage/2.4MΩ to
output voltage/24kΩ
S-8330A20FS
S-8330A22FS
∆VOUT
/∆Ta
—
—
—
—
—
—
144
±1.0
±1.1
±1.2
±1.3
±1.4
±1.5
180
—
—
—
—
—
—
216
kHz
%
2
mV
/°C
5
100
—
—
—
—
—
—
—
—
200
—
±300
±330
±360
±390
±420
±450
±30
—
1.0
—
—
—
—
—
—
—
mV
5
mV
5
mA
µA
—
3
2.0
—
—
—
—
100
50
—
Conditions
Min.
8
10
12
14
16
18
(Unless otherwise specified: Ta=25°C)
Typ.
—
—
—
—
—
—
Max.
20
22
24
26
28
30
±2.4%
9.0
200
100
1.0
%
V
µA
µA
µA
5
2
4
4
4
V
5
Unit
Mea.Circ.
Current consumption during power off
Output voltage temperature coefficient
Ta= -20°C to
70°C
S-8330A24FS
S-8330A26FS
S-8330A28FS
S-8330A30FS
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
µA
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
:
ISL
V
IN
=9V
-1
—
1
1
TSS
EFFI
1
—
3
85
6
—
ms
%
—
5
CD54 (47µH) of Sumida Electric Co., Ltd.
MA720 Schottky type of Matsushita Electronic Components Co., Ltd.
Diodes
:
Capacitors: F93 tantalum type (two circuits of 50V, 4.7µF are connected in parallel) of Nichicon Corporation
V
IN
=5V, V
OUT
=VOUT Max. I
OUT
= output voltage /24kΩ
ON/OFF=5V,VDIN=VCLK=VSTRB=0V
Note: Output voltage specified above is the typical value of the output voltage.
4
Seiko Instruments Inc.
Rev.4.1
2. S-8330B Series
Step-Up Switching Regulator
Item
Symbol
STEP-UP SWITCHING REGULATOR FOR LCD BIAS SUPPLY
S-8330/8331
Series
(Unless otherwise specified: Ta=25°C)
Conditions
S-8330B20FS
S-8330B22FS
Min.
8
10
12
14
16
18
Typ.
—
—
—
—
—
—
Max.
20
22
24
26
28
30
±2.4%
VIN
ISS1
ISS2
ISSS
V
IN
=5V, V
OUT
=Output voltage Max.
V
IN
=2V, V
OUT
=Output voltage Min.
Power off pin
=VDIN=0V,V
IN
=VCLK=VSTRB=5V
2.0
—
—
—
—
40
20
—
9.0
80
40
1.0
%
V
µA
µA
µA
5
2
4
4
4
V
5
Unit
Mea. Cir.
Output voltage range
VOUT
S-8330B24FS
S-8330B26FS
S-8330B28FS
S-8330B30FS
Output voltage accuracy
Input voltage
Current consumption 1
Current consumption 2
Current consumption during power off
Switching current
Switching transistor leakage current
ISW
ISWQ
VCONT=0.4V
Power off pin=0V , VCONT=9V
S-8330B20FS
S-8330B22FS
100
—
—
—
—
—
—
—
—
200
—
±300
±330
±360
±390
±420
±450
±30
—
1.0
—
—
—
—
—
—
—
mA
µA
—
3
Line regulation
∆VOUT1
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/2.4MΩ to
Output voltage/24kΩ
S-8330B20FS
S-8330B22FS
∆VOUT
/∆Ta
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
Ta=-20°C to +70°C
S-8330B24FS
S-8330B26FS
S-8330B28FS
S-8330B30FS
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
µA
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
:
ISL
V
IN
=9V
-1
—
1
1
TSS
EFFI
3
—
10
85
20
—
ms
%
—
5
CD54 (47µH) of Sumida Electric Co., Ltd.
MA720 Schottky type of Matsushita Electronic Components Co., Ltd.
Diodes
:
Capacitors: F93 tantalum type (two circuits of 50V, 4.7µF are connected in parallel) of Nichicon Corporation
V
IN
=5V,V
OUT
=VOUT Max. I
OUT
= output voltage /24kΩ
ON/OFF=5V,VDIN=VCLK=VSTRB=0V
Note: Output voltage specified above is the typical value of the output voltage.
Seiko Instruments Inc.
5
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