LM2576TADJ National Semiconductor, LM2576TADJ Datasheet

LM2576TADJ

Manufacturer Part Number

LM2576TADJ

Description

Manufacturer

National Semiconductor

Datasheet

1.LM2576HVS-12NOPB.pdf (24 pages)

Specifications of LM2576TADJ

Date_code

05+

Current page: 1 of 24
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LM2576/LM2576HV Series

SIMPLE SWITCHER

General Description

The LM2576 series of regulators are monolithic integrated

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

(buck) switching regulator, capable of driving 3A load with

excellent line and load regulation. These devices are avail-

able in fixed output voltages of 3.3V, 5V, 12V, 15V, and an

adjustable output version.

Requiring a minimum number of external components, these

regulators are simple to use and include internal frequency

compensation and a fixed-frequency oscillator.

The LM2576 series offers a high-efficiency replacement for

popular three-terminal linear regulators. It substantially re-

duces the size of the heat sink, and in some cases no heat

sink is required.

A standard series of inductors optimized for use with the

LM2576 are available from several different manufacturers.

This feature greatly simplifies the design of switch-mode

power supplies.

Other features include a guaranteed

put voltage within specified input voltages and output load

conditions, and

shutdown is included, featuring 50 µA (typical) standby cur-

rent. The output switch includes cycle-by-cycle current limit-

ing, as well as thermal shutdown for full protection under

fault conditions.

Typical Application

Versions)

SIMPLE SWITCHER

is a registered trademark of National Semiconductor Corporation.

10% on the oscillator frequency. External

(Fixed Output Voltage

4% tolerance on out-

DS011476

3A Step-Down Voltage Regulator

FIGURE 1.

Features

n 3.3V, 5V, 12V, 15V, and adjustable output versions

n Adjustable version output voltage range,

n Guaranteed 3A output current

n Wide input voltage range, 40V up to 60V for

n Requires only 4 external components

n 52 kHz fixed frequency internal oscillator

n TTL shutdown capability, low power standby mode

n High efficiency

n Uses readily available standard inductors

n Thermal shutdown and current limit protection

n P+ Product Enhancement tested

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 (Buck-Boost)

1.23V to 37V (57V for HV version)

line and load conditions

HV version

01147601

4% max over

www.national.com

August 2004

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