TC1121 datasheet(7/14 Pages) MICROCHIP

Numer części	TC1121

Szczegółowy opis	100mA Charge Pump Voltage Converter with Shutdown

PDF	14 Pages

Scroll/Zoom	100%

Producent	MICROCHIP [Microchip Technology]

Strona internetowa	http://www.microchip.com

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7 / 14 page

DS21358C-page 7

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

the

finite

impedance

the

common

charge-pump driver.

FIGURE 3-4:

Combined Positive Multiplier and Negative Converter

D1, D2 = 1N4148

VIN

VOUT = (2VIN) –

(VFD1) – (VFD2)

TC1121

GND

OSC

CAP+

CAP–

SHDN

VOUT

VIN

SHDN*

VOUT = VIN

–

*SHDN should be tied to VIN if not used.

TC1121 Arkusz danych(PDF) 7 Page - Microchip Technology