POWER CMOS DRIVERS WITH VOLTAGE TRIPLER
1
2
3
4
5
6
7
8
TC4626
TC4627
BOOSTER FUNCTION
The voltage booster is an unregulated voltage tripler
Pin 1 & 2 Waveforms
circuit. The tripler consists of three sets of internal switches
and three external capacitors. S1a and S1b charge capaci-
tor C1 to VDD potential. S2a and S2b add C1 potential to VDD
input to charge C2 to 2 x VDD. S3a and S3b add C1 potential
to C2 to charge C3 to 3 x VDD. The position of the switches
is controlled by the internal 4 phase clock.
3 x V
DD
2 x V
V
DD
PIN 2
VOLTAGE
DD
2 x V
DD
PIN 1
3 x V , V
VOLTAGE
6
3
DD BOOST
V
DD
0
6
C3
C2
S3a
S3b
2 x V
DD
S2a
S2b
8
2
(4 To 6V)
V
DD
ON
S1a
S1b
S1
S2
OFF
C1
ON
1
4
OFF
GND
ON
S3
OFF
Voltage Booster
Position of Switches
TELCOM SEMICONDUCTOR, INC.
4-275
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
