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TC1121

100mA Charge Pump Voltage Converter with Shutdown

Microchip Technology 

TC1121

3.6 Combined Positive Supply

Multiplication and Negative

Voltage Conversion

Figure 3-4 shows this dual function circuit, in which

capacitors C1 and C2 perform pump and reservoir

functions to generate negative voltage. Capacitors C3

and C4 are the respective capacitors for multiplied

positive voltage. This particular configuration leads to

higher source impedances of the generated supplies

due to the finite impedance of the common

charge-pump driver.

VI+N

8

FC

VIN

2 CAP+

OSC

C1

+

TC1121

3

GND

VOUT 5

D1, D2 = 1N4148

D1

VOUT = VI–N

4 CAP–

6

SHDN

SHDN*

C2

+

FIGURE 3-4:

+

C3

D2

+

C4

VOUT = (2VIN) –

(VFD1) – (VFD2)

*SHDN should be tied to VIN if not used.

Combined Positive Multiplier and Negative Converter

© 2006 Microchip Technology Inc.

DS21358C-page 7

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