SCI7631MAA 查看數據表（PDF） - Seiko Epson Corp

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SCI7631MAA

POWER SUPPLY IC - DC/DC Switching Regulators

Seiko Epson Corp 

SCI7630 Series

Other Applications

Voltage booster

Combining an SCI7631 switching regulator with an

SCI7661C/M DC/DC converter and voltage regulator

creates the voltage booster circuit shown in the follow-

ing figure.

L

D

VSW

VI1

VO

VI2 SCI7631M

GND

PS

PWCR

C1 + 1

14

10 µF

2

13

C2 + 3

12

10 µF 4 SCI7661C/M 11

5

10

C1

6

9

VI = –5 V

7

8

C3

10µF

ROSC

1 MΩ

POFF

VO = – 15V

Potential levels are shown in the following figure.

SCI7631M/CAA

VO (5 V)

VI (1.5 V)

GND (0 V)

SCI7661C/M

VDD (5 V)

VDD (0 V)

SCI7631MAA. The input voltage still reaches the

SCI7661C/M through L and D.

VI = 1.5 V

PS

GND = 0 V

VI = 5 V

POFF

GND = 0 V

Boost

ON

Boost

OFF

Boost

ON

Boost

OFF

VO (–10 V)

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

trol points, PS on the SCI7631CAA/MAA and POFF on

the SCI7661C/M, PS only shuts down the

4–20

EPSON

SCI7000 Series

Technical Manual

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