EPSON SCI7654M0A, SCI7654C0A service manual

查询SCI7654供应商

PF754-03

SCI7654M

0A

/C

0A

DC/DC Converter

Double/Triple/Quadruple Boosting

95% Excellent Power Conversion Efficiency
Built-in Voltage Regulator

DESCRIPTION

The SCI7654 is a highly efficient, but low power-consumption DC-to-DC converter based on the advanced CMOS
technologies. It can generate an output voltage double/triple/quadruple times higher than the input (in negative
direction) if 4/3/2 external capacitors are attached.
With a built-in voltage regulator, the SCI7654 can provide a stable output by setting the DC/DC output to any voltage
via two external resistors. This is optimum to the LCD panel power supply as the stable output can have the negative
temperature gradient required for an LCD panel.

FEATURES

An input voltage can be boosted double/triple/quadruple to negative potential.
Input voltages: –2.4 to –5.5V (quadruple boosting), –2.4 to –7.3V (triple boosting), –2.4 to –11.0V (double

boosting)
Excellent vol tage conversion efficiency: 95% (Typ.)
Large output current: 20 mA (Max.) during quadruple boosting
Built-in voltage regulator (for stable voltage output)
Built-in reference voltage source for accurate regulation: –1.5 ±0.05V (CT0)
Regulator output voltage temperature gradient function: –0.04, –0.15, –0.35, –0.55%/˚C
Low current consumption: 130 µA (Typ.)
Low standby current: 5.0 µA (Max.)
Built-in oscillator circuit
5/6-time voltage boosting in negative potential by serial connection
Package: SCI7654M0A SSOP2-16pin (plastic), SCI7654C0A DIP-16pin (plastic)

BLOCK DIAGRAM

V

DD

POFF1
POFF2

FC

V

IN

Power-Off

Control

Clock

Generator

Voltage Converter

C1P C2PC1N C3N C2N

Booster Control

Ref. Voltage

Circuit

Voltage Regulator

TC1
TC2

RV

REG

V
V

RI

V

OUT

SCI7654M0A/C

PIN CONFIGURATION

SSOP2-16pin/DIP-16pin

0A

V

V

OUT

V

REG

RV

V

DD

FC
TC1
TC2

1

RI

2
3
4
5
6
7
8

16
15
14
13
12
11
10

9

C2P
C2N
C3N
C1N
C1P
V

IN

POFF1
POFF2

PIN DESCRIPTION

Pin No. Pin Name Function

1VOUT Voltage output
2VRI Regulator input
3VREG Regulator output
4 RV Input for regulator output voltage adjustment
5VDD Input voltage pin (Positive)
6 FC Internal clock rate switch input, and clock input in serial/parallel

connection (Common input pin)
7 TC1 Input for regulator output temperature gradient setup (1)
8 TC2 Input for regulator output temperature gradient setup (2)
9 POFF2 Power-off control input (2)

10 POFF1 Power-off control input (1)
11 VIN Input voltage pin (Negative)
12 C1P Common double and quadruple boosting capacitor positive pin
13 C1N Double boosting capacitor negative pin
14 C3N Quadruple boosting capacitor negative pin
15 C2N Triple boosting capacitor negative pin
16 C2P Triple boosting capacitor positive pin

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SCI7654M0A/C

ABSOLUTE MAXIMUM RATINGS

Rating Symbol Min. Max. Unit Remark

Input Power Voltage VIN -26.0/N VDD +0.3 V N=Boosting time;

at VIN pin

Input Pin Voltage V

Output Pin Voltage 1 V0C1 VIN -0.3 VDD +0.3 V At C1P and C2P pins
Output Pin Voltage 2 VOC2 2 VIN -0.3 VIN +0.3 V At C1N pin
Output Pin Voltage 3 VOC3 3 VIN -0.3 2 VIN +0.3 V At C2N pin
Output Pin Voltage 4 VOC4 4 VIN -0.3 3 VIN +0.3 V At C3N pin
Regulator Input Power Voltage VRI N VIN -0.3 VDD +0.3 V N=Boosting time; at VRI pin
Regulator Input Pin Voltage VRV N VIN -0.3 VDD +0.3 V N=Boosting time; at RV pin
Output Voltage V0 N VIN -0.3 VDD +0.3 V N=Boosting time; at VOUT

Input Current IIN — 80 mA At VIN pin
Output Current IOUT — N≤4: 20 mA N=Boosting time; at VOUT

Allowable Loss Pd — 210 mW —
Operating Temperature Topr -30 85 ˚C —
Storage Temperature Tstg -55 150 ˚C —
Soldering Temperature and Time Tsol — 260•10 ˚C.S Temperature at leads

I VIN -0.3 VDD +0.3 V POFF1, POFF2

TC1, TC2, FC pins

and VREG pins

N>4: 80/N and VREG pins

0A

ELECTRICAL CHARACTERISTICS

(Unless otherwise designated: Ta=–30°V to +85°C, VDD=0V, VIN=–5.0V)

Characteristic Symbol Condition Min. Typ. Max. Unit
Input Power Voltage 1 VIN1 During quadruple boosting -5.5 — -2.4 V
Input Power Voltage 2 VIN2 During triple boosting -7.3 — -2.4 V
Input Power Voltage 3 VIN3 During double boosting -11 -2.4 V
Input Power Voltage N VINN During large-time boosting using -22/N — -2.4 V

external diodes

Boost Startup Input Power Voltage VSTA N=Boosting time, IOUT<200 A, -22/N — -2.4 V

FC=VDD
Booster Output Voltage VOUT — -22 —— V
Regulator Input Voltage VRI — -22 — -2.4 V
Regulator Output Voltage VREG IREG=0, VRI=-22V, ——-2.4 V

RRV=1MΩ
Booster Output Impedance ROUT IOUT=10mA, during quadruple — 200 300

boosting
Booster Power Conversion Peff IOUT=2 mA; during quadruple — 95 — %
Efficiency boosting;

C1, C2, C3, COUT=10 F Tantalum
Booster Operating Current IOPR1
Consumption 1 during no loading;

Booster Operating Current IOPR2
Consumption 2 during no loading;

Regulator Operating Current IOPVR VRI=-20 V, during no loading, — 10 15 A
Consumption RRV=1 M

FC=VDD, POFF1=VIN, POFF2=VDD; — 130 220 A

C1, C2, C3, COUT=10 F Tantalum

FC=VIN, POFF1=VIN, POFF2=VDD; — 520 880 A

C1, C2, C3, COUT=10 F Tantalum

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