TC1240_13 datasheet(9/18 Pages) MICROCHIP

部件名	TC1240

功能描述	Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package

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制造商	MICROCHIP [Microchip Technology]

网页	http://www.microchip.com

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9 / 18 page

 2001-2012 Microchip Technology Inc.

DS21516D-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.

3

1

2

4

5

C3

C1

C2

VIN

VOUT

RL

TC1240

TC1240A

C-

VIN

OUT

C+

GND

SHDN

6

+

Device

C1

C2

C3

TC1240

TC1240A

3.3 µF

类似零件编号 - TC1240_13

制造商	部件名	数据表	功能描述
Microchip Technology	TC1240A	290Kb / 16P	Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package 2003
	TC1240AECH	290Kb / 16P	Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package 2003
	TC1240AECHTR	290Kb / 16P	Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package 2003
	TC1240AI/CHTR	290Kb / 16P	Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package 2003
	TC1240ECH	858Kb / 11P	Positive Doubling Charge Pump with Shutdown in SOT Package 2001

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类似说明 - TC1240_13

制造商	部件名	数据表	功能描述
Microchip Technology	TC1240A	290Kb / 16P	Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package 2003
Microchip Technology	TC1240	858Kb / 11P	Positive Doubling Charge Pump with Shutdown in SOT Package 2001
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