SCI7638MHA Просмотр технического описания (PDF) - Seiko Epson Corp

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SCI7638MHA

POWER SUPPLY IC - DC/DC Switching Regulators

Seiko Epson Corp 

SCI7630 Series

Other Applications

Voltage booster

Combining an SCI7633MBA switching regulator with

an SCI7661C/M DC/DC converter and voltage regula-

tor creates the voltage booster circuit shown in the fol-

lowing figure.

L

D

VSW

VI1

VO

SCI7633M

GND

PS

RD

CG

CD

C1 + 1

14

10 µF

2

13

C2 + 3

12

10 µF 4 SCI7661C/M 11

5

10

C

6

9

VI = –5 V

7

8

C3

10 µF

ROSC

1 MΩ

POFF

VO = –15 V

Potential levels are shown in the following figure.

SCI7633MBA

VO (5 V)

VI (1.5 V)

GND (0 V)

SCI7661C/M

VDD (5 V)

VDD (0 V)

VO (–10 V)

Although the circuit appears to have two ON/OFF con-

trol points, PS on the SCI7633MBA and POFF on the

SCI7661C/M, PS only shuts down the SCI7633MBA.

The input voltage still reaches the SCI7661C/M

through L and D.

VI = 1.5 V

PS

GND = 0 V

VI = 5V

POFF

GND = 0 V

Boost

ON

Boost

OFF

Boost

ON

Boost

OFF

SCI7000 Series

Technical Manual

EPSON

4–31

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