LM2660MNOPB NATIONAL, LM2660MNOPB Datasheet

LM2660MNOPB

Manufacturer Part Number

LM2660MNOPB

Description

Manufacturer

NATIONAL

Datasheet

1.LM2660MNOPB.pdf (13 pages)

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LM2660/LM2661

Switched Capacitor Voltage Converter

General Description

The LM2660/LM2661 CMOS charge-pump voltage con-

verter inverts a positive voltage in the range of 1.5V to 5.5V

to the corresponding negative voltage. The LM2660/LM2661

uses two low cost capacitors to provide 100 mA of output

current without the cost, size, and EMI related to inductor

based converters. With an operating current of only 120 µA

and operating efficiency greater than 90% at most loads, the

LM2660/LM2661 provides ideal performance for battery

powered systems. The LM2660/LM2661 may also be used

as a positive voltage doubler.

The oscillator frequency can be lowered by adding an exter-

nal capacitor to the OSC pin. Also, the OSC pin may be used

to drive the LM2660/LM2661 with an external clock. For

LM2660, a frequency control (FC) pin selects the oscillator

frequency of 10 kHz or 80 kHz. For LM2661, an external

shutdown (SD) pin replaces the FC pin. The SD pin can be

used to disable the device and reduce the quiescent current

to 0.5 µA. The oscillator frequency for the LM2661 is 80 kHz.

Basic Application Circuits

Voltage Inverter

DS012911

01291103

Splitting V

Features

n Inverts or doubles input supply voltage

n Narrow SO-8 and Mini SO-8 Package

n 6.5Ω typical output resistance

n 88% typical conversion efficiency at 100 mA

n (LM2660) selectable oscillator frequency: 10 kHz/80 kHz

n (LM2661) low current shutdown mode

Applications

n Laptop computers

n Cellular phones

n Medical instruments

n Operational amplifier power supplies

n Interface power supplies

n Handheld instruments

in Half

Positive Voltage Doubler

01291126

September 1999

www.national.com

01291104

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