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LM26001 1.5A Switching Regulator with High Efficiency Sleep Mode

PRELIMINARY

May 2006

LM26001

1.5A Switching Regulator with High Efficiency Sleep

Mode

General Description

The LM26001 is a switching regulator designed for the high

efficiency requirements of applications with stand-by modes.

The device features a low-current sleep mode to maintain

efficiency under light-load conditions and current-mode con-

trol for accurate regulation over a wide input voltage range.

Quiescent current is reduced to 10 碌A(chǔ) typically in shutdown

mode and less than 40 碌A(chǔ) in sleep mode. Forced PWM

mode is also available to disable sleep mode.

The LM26001 can deliver up to 1.5A of continuous load

current with a fixed current limit, through the internal

N-channel switch. The part has a wide input voltage range of

4.0V to 38V and can operate with input voltages as low as

3V during line transients.

Operating frequency is adjustable from 150 kHz to 500 kHz

with a single resistor and can be synchronized to an external

clock.

Other features include Power good, adjustable soft-start,

enable pin, input under-voltage protection, and an internal

bootstrap diode for reduced component count.

Features

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High efficiency sleep mode

40 碌A(chǔ) typical Iq in sleep mode

10 碌A(chǔ) typical Iq in shutdown mode

3.0V minimum input voltage

4.0V to 38V continuous input range

1.5% reference accuracy

Cycle-by-cycle current limit

Adjustable Frequency (150 kHz to 500 kHz)

Synchronizable to an external clock

Power Good Flag

Forced PWM function

Adjustable Soft-start

TSSOP-16 exposed pad package

Thermal Shut Down

Applications

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Automotive Telematics

Navigation systems

In-Dash Instrumentation

Battery Powered Applications

Stand-by power for home gateways/set-top boxes

Typical Application Circuit

20179401

漏 2006 National Semiconductor Corporation

DS201794

www.national.com

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  1.5A Switching Regulator with High Efficiency Sleep MODE
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