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LM2664 Switched Capacitor Voltage Converter

November 1999

LM2664

Switched Capacitor Voltage Converter

General Description

The LM2664 CMOS charge-pump voltage converter inverts

a positive voltage in the range of +1.8V to +5.5V to the cor-

responding negative voltage of 鈭?.8V to 鈭?.5V. The LM2664

uses two low cost capacitors to provide up to 40 mA of out-

put current.

The LM2664 operates at 160 kHz oscillator frequency to re-

duce output resistance and voltage ripple. With an operating

current of only 220 碌A(chǔ) (operating efficiency greater than 91%

with most loads) and 1 碌A(chǔ) typical shutdown current, the

LM2664 provides ideal performance for battery powered

systems. The device is in SOT-23-6 package.

Features

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Inverts Input Supply Voltage

SOT23-6 Package

12鈩?Typical Output Impedance

91% Typical Conversion Efficiency at 40 mA

1碌A(chǔ) Typical Shutdown Current

Applications

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Cellular Phones

Pagers

PDAs

Operational Amplifier Power Suppliers

Interface Power Suppliers

Handheld Instruments

Basic Application Circuits

Voltage Inverter

DS100031-1

+5V to 鈭?0V Converter

DS100031-25

漏 1999 National Semiconductor Corporation

DS100031

www.national.com

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