LM2681

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SNVS042B – MARCH 1999 – REVISED MAY 2013

LM2681 Switched Capacitor Voltage Converter

Check for Samples: LM2681

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FEATURES

DESCRIPTION

The LM2681 CMOS charge-pump voltage converter

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•

Doubles or Splits Input Supply Voltage

operates as a voltage doubler for an input voltage in

•

SOT-23 6-Lead Package

the range of +2.5V to +5.5V. Two low cost capacitors

•

15

Ω Typical Output Impedance

and a diode (needed during start-up) is used in this

circuit to provide up to 20 mA of output current. The

•

90% Typical Conversion Efficiency at 20 mA

LM2681 can also work as a voltage divider to split a

voltage in the range of +1.8V to +11V in half.

APPLICATIONS

The LM2681 operates at 160 kHz oscillator frequency

•

Cellular Phones

to reduce output resistance and voltage ripple. With

•

Pagers

an operating current of only 550 µA (operating

•

PDAs

efficiency greater than 90% with most loads) the

LM2681

provides

ideal

performance

for

battery

•

Operational Amplifier Power Suppliers

powered systems. The device is in a SOT-23, 6-lead

•

Interface Power Suppliers

package.

•

Handheld Instruments

Basic Application Circuits

Voltage Doubler

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PRODUCTION DATA information is current as of publication date.

Copyright © 1999–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.