TC4626/TC4627

DS21426B-page 6

© 2002 Microchip Technology Inc.

3.1

BOOSTER FUNCTION

The voltage booster is an unregulated voltage tripler

circuit. The tripler consists of three sets of internal

switches and three external capacitors. S1a and S1b

and S3b add C1 potential to C2 to charge C3 to 3 x

internal 4 phase clock.

FIGURE 3-3:

VOLTAGE BOOSTER

FIGURE 3-4:

POSITION OF SWITCHES

C3

C2

6

3

8

2

C1

S1a

S1b

GND

4

S2a

S2b

6

S3b

S3a

1

(4 to 6V)

+

+

+

Pin 2

Voltage

Pin 1

Voltage

0

On

Off

S1

On

Off

S2

On

Off

S3

Pin 1 & 2 Waveforms