Epson S1F70000 manual 177

S1F76300 Series

Other Applications

Voltage booster

Combining an S1F76330M1B0 switching regulator with an S1F76610C/M DC/DC converter and voltage

regulator creates the voltage booster circuit shown in the following figure.

LD

VSW

C1

+

1

14

10

∝F

2

13

ROSC

VO

VI1

3

12

1 MΩ

C2

+

10

∝F

4

S1F76610C/M 11

S1F76330M

POFF

GND

C

5

10

6

9

VO = –15 V

PS

RD

VI = –5 V

7

8

CG

C3

CD

∝

10 F

Potential levels are shown in the following figure.

S1F76330M1B0 S1F76610C/M

VO (5 V) VDD (5 V)

VI (1.5 V)

GND (0 V) VDD (0 V)

VO (–10 V)

Although the circuit appears to have two ON/OFF control points, PS on the S1F76330M1B0 and POFF on the S 1 F 7 6 6 1 0 C / M , P S o n l y s h u t s d o w n t h e S1F76330M1B0. The input voltage still reaches the S1F76610C/M through L and D.

		VI = 1.5 V
PS
	GND = 0 V
			Boost	Boost
		VI = 5V	ON	OFF
POFF
	GND = 0 V
			Boost	Boost
			ON	OFF

4–32 EPSON

S1F70000 Series Technical Manual