TC1240 datasheet(9/16 Pages) MICROCHIP

No de pièce	TC1240

Description	Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package

PDF	16 Pages

Scroll/Zoom	100%

Fabricant	MICROCHIP [Microchip Technology]

Site Internet	http://www.microchip.com

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 2003 Microchip Technology Inc.

DS21516C-page 9

TC1240/TC1240A

5.4

Input Supply Bypassing

The VIN input should be capacitively bypassed to

reduce AC impedance and minimize noise effects due

to the switching internal to the device. The

recommended capacitor should be a large value (at

least equal to C1) connected from the input to GND.

5.5

Shutdown Input

The TC1240 and TC1240A are disabled when SHDN is

high, and enabled when SHDN is low. This input cannot

be allowed to float.

FIGURE 5-3:

Test Circuit.

5.6

Voltage Doubler

The most common application for charge pump

devices is the doubler (Figure 5-3). This application

uses two external capacitors – C1 and C2 (plus a power

supply bypass capacitor, if necessary). The output is

equal to 2 x VIN minus any voltage drops due to

loading. Refer to Table 5-1 and Table 5-2 for capacitor

selection.

VIN

VOUT

TC1240

TC1240A

C-

VIN

OUT

C+

GND

SHDN

Device

TC1240

TC1240A

3.3µF

3.3 µF

3.3µF

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