The LM2596 /LM2596HV series operates at a switching

frequency of150 kHz thus allowing smaller sized filter compontents

than what would be needed with lower frequency

switching regulators. Available in a standard 5-lead TO-220

package with several different lead bend options, and a

5-lesd TO-262 surface mount package.

The LM2596 /LM2596HV 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 available in fixed output voltages of 3.3V, 5V, 12V, and an

adjustable output version.

General Description

Requiring a minimum number of external components, these

regulators are simple to use and include internal frequency

compensation?, and a fixed-frequency oscillator.

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 ±4% tolerance on output

voltage under specified input voltage and output load

conditions, and ±15% on the oscillator frequency. External

shutdown is included, featuring typically 80 μA standby current.

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.

Available in TO-220 and TO-263,TO-220B packages

(57V for HV version)

特性 Features

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

Adjustable version output voltage range, 1.2V to 37V

±4% max over line and load conditions

Guaranteed 3A output load current

Input voltage range up to 40V

Requires only 4 external components

Excellent line and load regulation specifications

150 kHz fixed frequency internal oscillator

TTL shutdown capability

Low power standby mode, IQ typically 80 μA

High efficiency

Uses readily available standard inductors

Thermal shutdown and current limit protection

Applications

Simple high-efficiency step-down (buck) regulator

On-card switching regulators

Positive to negative converter