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TC4626 Datasheet, PDF (6/14 Pages) TelCom Semiconductor, Inc – POWER CMOS DRIVERS WITH VOLTAGE TRIPLER
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TC4626/TC4627
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
charge capacitor C1 to VDD potential. S2a and S2b add
FIGURE 3-3:
VOLTAGE BOOSTER
+
C3
6
3 x VDD, VBOOST
3
+
C2
2 x VDD
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.
6
S3a
S2a
S3b
8
(4 to 6V)
VDD
S1a
S2b
2
+
C1
1
S1b
GND
4
FIGURE 3-4:
POSITION OF SWITCHES
3 x VDD
Pin 1 & 2 Waveforms
Pin 2
Voltage
2 x VDD
VDD
Pin 1
Voltage
2 x VDD
VDD
0
DS21426B-page 6
On
S1
Off
On
S2
Off
On
S3
Off
© 2002 Microchip Technology Inc.
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