LM2598 datasheet(1/33 Pages) NSC

tên linh kiện	LM2598

Giải thích chi tiết về linh kiện	SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator, with Features

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LM2598

SIMPLE SWITCHER® Power Converter 150 kHz

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†, improved line and load specifications,

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 ±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 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

±4% max over line and load conditions

n

Guaranteed 1A output current

n

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

package

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

Q typically 85 µA

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

Typical Application (Fixed Output Voltage Versions)

†Patent Number 5,382,918.

SIMPLE SWITCHER® and

Switchers Made Simple® are registered trademarks of National Semiconductor Corporation.

DS012593-1

January 2001

DS012593

www.national.com

Số phần tương tự - LM2598

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Texas Instruments	LM2598	2Mb / 45P	SIMPLE SWITCHER짰 Power Converter 150 kHz 1A Step-Down Voltage Regulator with Features
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	LM2598S-12/NOPB	2Mb / 47P	SIMPLE SWITCHER Power Converter 150-kHz 1-A Step-Down Voltage Regulator, With Features
	LM2598S-3.3/NOPB	2Mb / 47P	SIMPLE SWITCHER Power Converter 150-kHz 1-A Step-Down Voltage Regulator, With Features
	LM2598S-5.0	2Mb / 47P	SIMPLE SWITCHER Power Converter 150-kHz 1-A Step-Down Voltage Regulator, With Features

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Mô tả tương tự - LM2598

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National Semiconductor ...	LM2590HV	752Kb / 20P	SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator, with Features
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