tc4627 Microchip Technology Inc., tc4627 Datasheet - Page 6

• Manufacturer Part Number: tc4627
• Description: Power Cmos Drivers With Voltage Tripler
• Manufacturer: Microchip Technology Inc.

TC4626/TC4627
3.1
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 V
FIGURE 3-3:
FIGURE 3-4:
DS21426B-page 6
BOOSTER FUNCTION
VOLTAGE BOOSTER
POSITION OF SWITCHES
C2
C3
C1
DD
+
+
+
(4 to 6V)
potential. S2a and S2b add
GND
V
Voltage
Voltage
DD
Pin 2
Pin 1
S1
S2
S3
6
3
8
2
1
4
3 x V
2 x V
2 x V
V
V
On
Off
On
Off
On
Off
DD
DD
DD
DD
DD
0
S1a
S1b
3 x V
Pin 1 & 2 Waveforms
DD
2 x V
, V
DD
BOOST
S2a
S2b
C1 potential to V
and S3b add C1 potential to C2 to charge C3 to 3 x
V
internal 4 phase clock.
DD
. The position of the switches is controlled by the
DD
input to charge C2 to 2 x V
S3a
S3b
©
2002 Microchip Technology Inc.
6
DD
. S3a