lm2598sx-12 National Semiconductor Corporation, lm2598sx-12 Datasheet

lm2598sx-12

Manufacturer Part Number

lm2598sx-12

Description

Simple Switcher Power Converter 150 Khz 1a Step-down Voltage Regulator, With Features

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM2598SX-12.pdf (33 pages)

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LM2598

SIMPLE SWITCHER

1A Step-Down Voltage Regulator, with Features

General Description

The LM2598 series of regulators are monolithic integrated

circuits that provide all the active functions for a step-down

(buck) switching regulator, capable of driving a 1A load with

excellent line and load regulation. These devices are avail-

able in fixed output voltages of 3.3V, 5V, 12V, and an adjust-

able output version.

This series of switching regulators is similar to the LM2595

series, with additional supervisory and performance features

added.

Requiring a minimum number of external components, these

regulators are simple to use and include internal frequency

compensation

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

delay and error flag output.

The LM2598 series 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. Typically, for output voltages less than 12V,

and ambient temperatures less than 50˚C, no heat sink is

required.

A standard series of inductors (both through hole and sur-

face mount types) are available from several different manu-

facturers optimized for use with the LM2598 series. This

feature greatly simplifies the design of switch-mode power

supplies.

Other features include a guaranteed

put voltage under all conditions of input voltage and output

load conditions, and

Typical Application

†

SIMPLE SWITCHER

Patent Number 5,382,918.

†

, improved line and load specifications,

and Switchers Made Simple

15% on the oscillator frequency. Ex-

(Fixed Output Voltage Versions)

are registered trademarks of National Semiconductor Corporation.

4% tolerance on out-

DS012593

Power Converter 150 kHz

ternal shutdown is included, featuring typically 85 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, 12V, and adjustable output versions

n Adjustable version output voltage range, 1.2V to 37V

n Guaranteed 1A output current

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

n Input voltage range up to 40V

n Excellent line and load regulation specifications

n 150 kHz fixed frequency internal oscillator

n Shutdown /Soft-start

n Out of regulation error flag

n Error output delay

n Low power standby mode, I

n High Efficiency

n Uses readily available standard inductors

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

package

4% max over line and load conditions

typically 85 µA

DS012593-1

January 2001

www.national.com

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