TCM829 データシートの表示（PDF） - Microchip Technology

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TCM829

Switched Capacitor Voltage Converters

Microchip Technology 

4.0 DETAILED DESCRIPTION

The TCM828/TCM829 charge pump converters invert

the voltage applied to the VIN 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 VIN 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

VOUT = -(VIN)

FIGURE 4-1:

Charge Pump.

Ideal Switched Capacitor

TCM828/TCM829

© 2010 Microchip Technology Inc.

DS21488B-page 11

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