TC1220 Microchip Technology, TC1220 Datasheet - Page 4
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TC1220
Manufacturer Part Number
TC1220
Description
(TC1219) Switched Capacitor Voltage Converters with Shutdown in SOT Packages
Manufacturer
Microchip Technology
Datasheet
1.TC1220.pdf
(16 pages)
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TC1219/TC1220
3.0
The TC1219/TC1220 charge pump converters invert
the voltage applied to the V
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 V
second phase, S2 and S4 are closed, and S1 and S3
are opened. This action connects C1 across C2,
restoring charge to C2.
DS21366B-page 4
IN
and load current is supplied from C2. During the
DETAILED DESCRIPTION
IN
pin. Conversion consists
FIGURE 3-1:
V
IN
OSC
S3
S1
C1
IDEAL SWITCHED
CAPACITOR CHARGE
PUMP
Phase 1
2002 Microchip Technology Inc.
S4
S2
C2
TC1219/1220
V
OUT
= – (V
IN
)