TC1220 Microchip Technology, TC1220 Datasheet - Page 4

• Manufacturer Part Number: TC1220
• Description: (TC1219) Switched Capacitor Voltage Converters with Shutdown in SOT Packages
• Manufacturer: Microchip Technology

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
)