LM2767

Switched Capacitor Voltage Converter

General Description

The LM2767 CMOS charge-pump voltage converter oper-

ates as a voltage doubler for an input voltage in the range of

+1.8V to +5.5V. Two low cost capacitors and a diode are

used in this circuit to provide at least 15 mA of output current.

The LM2767 operates at 11 kHz switching frequency to

avoid audio voice-band interference. With an operating cur-

rent of only 40 µA (operating efficiency greater than 90% with

most loads), the LM2767 provides ideal performance for bat-

tery powered systems. The device is manufactured in a

SOT23-5 package.

Features

n

Doubles Input Supply Voltage

n

SOT23-5 Package

n

20

Ω Typical Output Impedance

n

96% Typical Conversion Efficiency at 15mA

Applications

n

Cellular Phones

n

Pagers

n

PDAs, Organizers

n

Operational Amplifier Power Suppliers

n

Interface Power Suppliers

n

Handheld Instruments

Basic Application Circuit

Ordering Information

Order Number

Package

Number

Package

Marking

Supplied as

LM2767M5

MA05B

S17B (Note 1)

Tape and Reel (1000 units/reel)

LM2767M5X

MA05B

S17B (Note 1)

Tape and Reel (3000 units/reel)

Note 1: The small physical size of the SOT-23 package does not allow for the full part number marking. Devices will be marked with the designation shown in

the column Package Marking.

Voltage Doubler

DS101274-1

February 2000

© 2000 National Semiconductor Corporation

DS101274

www.national.com