LM2660

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SNVS135D – SEPTEMBER 1999 – REVISED MAY 2013

LM2660 Switched Capacitor Voltage Converter

Check for Samples: LM2660

1

FEATURES

DESCRIPTION

The LM2660 CMOS charge-pump voltage converter

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•

Inverts or Doubles Input Supply Voltage

is a versatile unregulated switched capacitor inverter

•

Narrow SO-8 and Mini SO-8 Package

or doubler. Operating from a wide 1.5V to 5.5V

•

6.5

Ω Typical Output Resistance

supply voltage, the LM2660 uses two low-cost

capacitors to provide 100 mA of output current

•

88% Typical Conversion Efficiency at 100 mA

without the cost, size and EMI related to inductor-

•

Selectable Oscillator Frequency: 10 kHz/80

based converters. With an operating current of only

kHz

120 µA and operating efficiency greater than 90% at

•

Optional External Oscillator Input

most loads, the LM2660 provides ideal performance

for battery-powered systems. LM2660 devices can be

operated

directly

in

parallel

to

lower

output

APPLICATIONS

impedance, thus providing more current at a given

•

Laptop Computers

voltage.

•

Cellular Phones

The FC (frequency control) pin selects between a

•

Medical Instruments

nominal 10 kHz or 80 kHz oscillator frequency. The

•

Operational Amplifier Power Supplies

oscillator frequency can be lowered by adding an

external capacitor to the OSC pin. Also, the OSC pin

•

Interface Power Supplies

may be used to drive the LM2660 with an external

•

Handheld Instruments

clock up to 150 kHz. Through these methods, output

ripple frequency and harmonics may be controlled.

Additionally, the LM2660 may be configured to divide

a positive input voltage precisely in half. In this mode,

input voltages as high as 11V may be used.

Basic Application Circuits

Voltage Inverter

Positive 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.