SCI7654C0A EPSON [Epson Company], SCI7654C0A Datasheet

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SCI7654C0A

Manufacturer Part Number
SCI7654C0A
Description
DC/DC Converter
Manufacturer
EPSON [Epson Company]
Datasheet
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.
DESCRIPTION
FEATURES
BLOCK DIAGRAM
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
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 A (Typ.)
Low standby current: 5.0 A (Max.)
Built-in oscillator circuit
5/6-time voltage boosting in negative potential by serial connection
Package: SCI7654M
boosting)
POFF1
POFF2
V
V
FC
DD
IN
0A
SSOP2-16pin (plastic), SCI7654C
C1P
Power-Off
Generator
Control
Clock
C1N
Voltage Converter
C3N
Booster Control
C2P
SCI7654M
Double/Triple/Quadruple Boosting
C2N
95% Excellent Power Conversion Efficiency
Built-in Voltage Regulator
0A
DIP-16pin (plastic)
DC/DC Converter
Voltage Regulator
Ref. Voltage
Circuit
0A
/C
TC1
TC2
RV
V
V
V
REG
RI
OUT
PF754-03
0A

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SCI7654C0A Summary of contents

Page 1

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 ...

Page 2

SCI7654M / PIN CONFIGURATION SSOP2-16pin/DIP-16pin PIN DESCRIPTION Pin No. Pin Name 1 V OUT REG TC1 8 TC2 9 POFF2 10 POFF1 ...

Page 3

ABSOLUTE MAXIMUM RATINGS Rating Symbol Input Power Voltage V IN Input Pin Voltage V Output Pin Voltage 1 V 0C1 Output Pin Voltage 2 V OC2 Output Pin Voltage 3 V OC3 Output Pin Voltage 4 V OC4 Regulator Input ...

Page 4

SCI7654M / ELECTRICAL CHARACTERISTICS (continued) Characteristic Symbol Static Current Input Leakage Current Stable Output Saturation Resistance Stable Output Voltage Stability Stable Output Load Variation Reference Voltage ( Reference Voltage Temperature Coefficient (*4) (*5) Input Voltage ...

Page 5

FUNCTIONAL DESCRIPTION Clock Generator Circuit As the SCI7654 has a built-in clock generator circuit, it requires no external source at all. The clock rate changes depending on the FC pin signal level, and the Low Output or High Output mode ...

Page 6

SCI7654M / Voltage Regulator Circuit The circuit receives a voltage from V a ratio of R1 and R2 external divider resistors. Although the sum of divider resistors is desirable to be minimum to prevent an interference due to ...

Page 7

REFERENCE CIRCUIT EXAMPLE Four-time booster circuit This example drives the booster circuit only, boosts the V outputs it at the V pin. However, this does not have a voltage regulator and the voltage at V OUT a ripple. V OUT ...

Page 8

SCI7654M / PACKAGE DIMENSIONS Plastic SSOP2-16pin 7 max ( ) 0.275 max 6.6 0.2 +0.007 ( ) 0.26 –0.008 16 INDEX 1 0 0.014 0.031 0.36 0.1 +0.004 ) –0.003 0 10 ...

Page 9

Plastic DIP-16pin 19.7 max ( 0.775 max 19 0.1 ( 0.748 0.003 0.059 0.46 0.1 +0.004 0.018 –0.003 15 SCI7654M / 7.62 ...

Page 10

NOTICE: No part of this material may be reproduced or duplicated in any form or by any means without the written permission of Seiko Epson. Seiko Epson reserves the right to make changes to this material without notice. Seiko Epson ...

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