SCI7654M0A 查看數據表（PDF） - Seiko Epson Corp

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SCI7654M0A

DC/DC Converter

Seiko Epson Corp 

SCI7654M0A/C0A

Voltage Regulator Circuit

The circuit receives a voltage from VRI pin, stabilizes it, and outputs at any voltage. The output is adjustable with

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 external noise, 100 to 1 megohms are recommended as the current

consumption may be increased by the divider resistors.

R1

R2

1 VOUT

2 VRI

3 VREG

4 RV

5 VDD

6 FC

7 TC1

8 TC2

C2P 16

C2N 15

C3N 14

C1N 13

C1P 12

VIN 11

POFF1 10

POFF2 9

Power Off Control

The SCI7654 has an automatic power-off function, and can turn on or off each function depending on the external

signals entered in POFF1 and POFF2 pins.

Mode

PS1

PS2

PS3

PS4

POFF1

H(VDD)

L

H

L

POFF2

L(VIN)

L

H

H

Oscillator

ON

OFF

OFF

ON

Booster

ON

OFF (*1)

ON

ON

Function Status

Regulator

Description

ON

All circuits are turned ON.

OFF (*2) All circuits are turned OFF.

ON

Slave side (booster and regulator)

in parallel connection

Master side (for booster only)

OFF

in parallel connection; first stage

in serial connection (*3)

*1 When the booster circuit is OFF, approximately VIN +0.6V voltage appears at VOUT pin.

*2 When the regulator is OFF, the VREG pin is set to the high-impedance status.

*3 The mode selected depends on the line connection at the second stage of serial connection.

6

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