4-275

TELCOM SEMICONDUCTOR, INC.

7

6

5

4

3

1

2

8

POWER CMOS DRIVERS WITH VOLTAGE TRIPLER

TC4626

TC4627

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 charge capaci-

is controlled by the internal 4 phase clock.

C3

C2

6

3

8

2

C1

(4 To 6V)

S1a

S1b

GND

4

S2a

S2b

2 x VDD

3 x VDD, VBOOST

6

S3b

S3a

1

VDD

Voltage Booster

Position of Switches

PIN 2

VOLTAGE

PIN 1

VOLTAGE

3 x VDD

2 x VDD

VDD

2 x VDD

VDD

0

ON

OFF

S1

ON

OFF

S2

ON

OFF

S3

BOOSTER FUNCTION

Pin 1 & 2 Waveforms