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TC1240/TC1240A

General Description

The TC1240/TC1240A is a doubling CMOS charge

pump voltage converter in a small 6-Pin SOT-23A

package. The TC1240 doubles an input voltage that

can range from +2.5V to +4.0V, while the TC1240A

doubles an input voltage that can range from +2.5V to

+5.5V. Conversion efficiency is typically >99%. Internal

oscillator frequency is 160 kHz for both devices. The

TC1240 and TC1240A have an active-high shutdown

that limits the current consumption of the devices to

less than 1 碌A(chǔ).

External component requirement is only two capacitors

for standard voltage doubler applications. All other

circuitry (including control, oscillator and power

MOSFETs) are integrated on-chip. Typical supply cur-

rent is 180 碌A(chǔ) for the TC1240 and 550 碌A(chǔ) for the

TC1240A. Both devices are available in a 6-Pin SOT-

23A surface mount package.

Positive Doubling Charge Pumps with Shutdown

in a SOT-23 Package

Charge Pumps in 6-Pin SOT-23A Package

>99% Typical Voltage Conversion Efficiency

Voltage Doubling

Input Voltage Range, TC1240: +2.5V to +4.0V,

TC1240A: +2.5V to +5.5V

Low Output Resistance, TC1240: 17鈩?(Typical)

TC1240A: 12鈩?(Typical)

Only Two External Capacitors Required

Low Supply Current, TC1240: 180 碌A(chǔ) (Typical)

TC1240A: 550 碌A(chǔ) (Typical)

Power-Saving Shutdown Mode (1 碌A(chǔ) Maximum)

Shutdown Input Fully Compatible with 1.8V Logic

Systems

Applications

鈥?/div>

Cellular Phones

Pagers

PDAs, Portable Data Loggers

Battery Powered Devices

Handheld Instruments

Typical Application Circuit

Positive Voltage Doubler

+

C+

C-

V

IN

INPUT

Package Type

6-Pin SOT-23A

C+

6

V

OUT

SHDN

5

4

C

1

TC1240

TC1240A

SHDN

OFF

ON

V

OUT

GND

+

C

2

2 x INPUT

TC1240ECH

TC1240AECH

1

V

IN

2

GND

3

C-

NOTE:

6-Pin SOT-23A is equivalent to the

EIAJ (SC-74A)

錚?/div>

2003 Microchip Technology Inc.

DS21516C-page 1

型號

版本

描述

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