LM2596SX-3.3+ National Semiconductor, LM2596SX-3.3+ Datasheet

LM2596SX-3.3+

Manufacturer Part Number

LM2596SX-3.3+

Description

Manufacturer

National Semiconductor

Datasheet

1.LM2596S12NOPB.pdf (31 pages)

Specifications of LM2596SX-3.3+

Notes

NEW

Date_code

10+

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LM2596

SIMPLE SWITCHER

3A Step-Down Voltage Regulator

General Description

The LM2596 series of regulators are monolithic integrated

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

(buck) switching regulator, capable of driving a 3A 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.

Requiring a minimum number of external components, these

regulators are simple to use and include internal frequency

compensation

The LM2596 series operates at a switching frequency of

150 kHz thus allowing smaller sized filter components than

what would be needed with lower frequency switching regu-

lators. Available in a standard 5-lead TO-220 package with

several different lead bend options, and a 5-lead TO-263

surface mount package.

A standard series of inductors are available from several

different manufacturers optimized for use with the LM2596

series. This feature greatly simplifies the design of

switch-mode power supplies.

Other features include a guaranteed

put voltage under specified input voltage and output load

conditions, and

shutdown is included, featuring typically 80 µA standby cur-

rent. Self protection features include a two stage frequency

reducing current limit for the output switch and an over

temperature shutdown for complete protection under fault

conditions.

Typical Application

Versions)

SIMPLE SWITCHER

†

, and a fixed-frequency oscillator.

and Switchers Made Simple

15% on the oscillator frequency. External

(Fixed Output Voltage

are registered trademarks of National Semiconductor Corporation.

4% tolerance on out-

DS012583

Power Converter 150 kHz

Features

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

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

n Available in TO-220 and TO-263 packages

n Guaranteed 3A output load current

n Input voltage range up to 40V

n Requires only 4 external components

n Excellent line and load regulation specifications

n 150 kHz fixed frequency internal oscillator

n TTL shutdown capability

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 On-card switching regulators

n Positive to negative converter

Note:

4% max over line and load conditions

†

Patent Number 5,382,918.

typically 80 µA

01258301

www.national.com

May 2002

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