TCM829ECT713 Datasheet, PDF (11/26 Pages) Microchip Technology – Switched Capacitor Voltage Converters

4.0 DETAILED DESCRIPTION
The TCM828/TCM829 charge pump converters invert
the voltage applied to the V_IN pin. Conversion consists
of a two phase operation (Figure 4-1). During the first
phase, switches S2 and S4 are open, while S1 and S3
are closed. During this time, C1 charges to the voltage
on V_IN and load current is supplied from C2. During the
second phase, S2 and S4 are closed, and S1 and S3
are open. This action connects C1 across C2, restoring
charge to C2.
S1
S2
IN
C1
TCM828/
TCM829
C2
S3
S4
V_OUT = -(V_IN)
FIGURE 4-1:
Charge Pump.
Ideal Switched Capacitor
TCM828/TCM829
© 2010 Microchip Technology Inc.
DS21488B-page 11