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TC1221 Datasheet(PDF) 4 Page - Microchip Technology

Part No. TC1221
Description  High Frequency Switched Capacitor Voltage Converters with Shutdown in SOT Packages
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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TC1221 Datasheet(HTML) 4 Page - Microchip Technology

 
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TC1221/TC1222
DS21367B-page 4
 2002 Microchip Technology Inc.
3.0
DETAILED DESCRIPTION
The TC1221/TC1222 charge pump converters invert
the voltage applied to the VIN pin. Conversion consists
of a two-phase operation (Figure 3-1). During the first
phase, switches S2 and S4 are opened and 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 opened. This action connects C1 across C2,
restoring charge to C2.
FIGURE 3-1:
IDEAL SWITCHED
CAPACITOR CHARGE
PUMP
VOUT = – (VIN)
C1
C2
TC1221/1222
Phase 1
VIN
S1
S3
S4
S2
OSC


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