S1F76540 Series

APPLICATION CIRCUIT EXAMPLESFour-time Booster and Regulator

Figure 2.8 gives a wiring example of four-time booster and regulator that is the typical S1F76540 application. This example boosts the input voltage (VI) four times in

negative direction, and outputs the regulated voltage at VREG pin.

CO

+

VREG

CREG

1

VO

C2P 16

+

 

 

 

 

 

 

 

R1

+

2

VRI

C2N 15

C2

R2

3

VREG

C3N 14

 

 

 

C3

 

 

 

 

 

 

 

 

4

RV

C1N

13

C1

 

 

+

VDD

 

5

VDD

C1P

12

+

 

 

 

 

6

FC

VI

11

 

 

+

7

TC1

POFF1 10

 

CI

 

8

TC2

POFF2

9

 

VI

Figure 2.8 Wiring example of 4-time booster and regulator

◊Setup conditions of Figure 2.8

• Internal clock

: ON (Low Output mode)

• Booster circuit : ON

• Regulator

: ON (if CT = –0.04%/°C)

◊Power-off procedure

•Set the POFF1 pin to logical low (VI) to turn off all circuits.

◊Regulator

•For the regulator setup and notes, see the “voltage regulator circuit” section.

◊Application in other setup conditions

1 When used in the High Output mode

• Connect the FC pin to the VI pin.

2When changing the temperature coefficient (CT)

• Change the TC1 and TC2 pin setup by following the definition of Table 2.7.

2–30

EPSON

S1F70000 Series Technical Manual