4-25

TELCOM SEMICONDUCTOR, INC.

7

6

5

4

3

1

2

8

TC682

INVERTING VOLTAGE DOUBLER

–

+

V

OUT

V

OUT

10

µF

10

µF

10

µF

10

µF

22

µF

C

OUT

V

IN

V

IN

V

IN

GND

GND

NEGATIVE

SUPPLY

TC682

–

+

C–

TC682

GND

+

–

+

–

+

–

+

–

+

–

–

–

–

2

C+

2

–

+

Figure 5. Paralleling TC682 for Lower Output Source Resistance

Figure 6. Negative Supply Derived from 3V Battery

V

IN

V

SS

V

IN

V

OUT

V

SS

V

IN

V

OUT

GND

TC682

3V

GROUND

–5 SUPPLY

LOW BATTERY

NEGATIVE LDO

REGULATOR

TC54VC2702Exx

V

OUT

C

OUT

–

1

µF

+

–

+

–

+

–

+

–

+

–

+

+

–

–

10

µF

22

µF

10

µF

–