1FEATURES

2• High Efficiency Sleep Mode

• 40 μA Typical Iq in Sleep Mode

• 10 μA Typical Iq in Shutdown Mode

• 3.0V Minimum Input Voltage

• 4.0V to 18V Continuous Input Range

• 2.0% 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

• HTSSOP-16 Exposed Pad Package

• Thermal Shut Down

APPLICATIONS

• Automotive Telematics

• Navigation Systems

• In-Dash Instrumentation

• Battery Powered Applications

• Stand-by Power for Home Gateways/Set-Top

Boxes

DESCRIPTION

The LM26001B 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 control for accurate

regulation over a wide input voltage range. Quiescent current is reduced to 10 μA typically in shutdown

mode and less than 40 μA in sleep mode. Forced

PWM mode is also available to disable sleep mode.

The LM26001B 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 18V 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.