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LM2593HV

SIMPLE SWITCHER

Power Converter 150 kHz 2A

Step-Down Voltage Regulator, with Features

General Description

The LM2593HV series of regulators are monolithic inte-

grated circuits that provide all the active functions for a

step-down (buck) switching regulator, capable of driving a

2A load with excellent line and load regulation. These de-

vices are available in fixed output voltages of 3.3V, 5V, and

an adjustable output version.

This series of switching regulators is similar to the

LM2592HV with additional supervisory and performance fea-

tures.

Requiring a minimum number of external components, these

regulators are simple to use and include internal frequency

compensation

†

, improved line and load specifications,

fixed-frequency oscillator, Shutdown/Soft-start, output error

flag and flag delay.

The LM2593HV operates at a switching frequency of 150

kHz thus allowing smaller sized filter components than what

would be needed with lower frequency switching regulators.

Available in a standard 7-lead TO-220 package with several

different lead bend options, and a 7-lead TO-263 Surface

mount package.

Other features include a guaranteed

4% tolerance on out-

put voltage under all conditions of input voltage and output

load conditions, and

15% on the oscillator frequency. Ex-

ternal shutdown is included, featuring typically 90 µA

standby current. Self protection features include a two stage

current limit for the output switch and an over temperature

shutdown for complete protection under fault conditions.

Features

n 3.3V, 5V, and adjustable output versions

n Adjustable version output voltage range, 1.2V to 57V

4% max over line and load conditions

n Guaranteed 2A output load current

n Available in 7-pin TO-220 and TO-263 (surface mount)

Package

n Input voltage range up to 60V

n 150 kHz fixed frequency internal oscillator

n Shutdown/Soft-start

n Out of regulation error flag

n Error flag delay

n Low power standby mode, I

typically 90 µA

n High Efficiency

n Thermal shutdown and current limit protection

Applications

n Simple high-efficiency step-down (buck) regulator

n Efficient pre-regulator for linear regulators

n On-card switching regulators

n Positive to Negative converter

Note:

†

Patent Number 5,382,918.

Typical Application (Fixed Output Voltage Versions)

10133301

SIMPLE SWITCHER

and

Switchers Made Simple

are registered trademarks of National Semiconductor Corporation.

December 2001

LM2593HV SIMPLE SWITCHER Power Converter 150 kHz 2A Step-Down Voltage Regulator, with

Features