3.3V, 5.0V, 12V, 15V, and Adjustable Output VersionsAdjustable Version Output Voltage Range, 1.23 to 37V+/- 4%. Maximum Over Line and Load Conditions

Guaranteed 3.0A Output Current

Wide Input Voltage Range

Requires Only 4 External Components

150Khz Fixed Frequency Internal Oscillator

TTL Shutdown Capability, Low Power Standby Mode

High Efficiency

Uses Readily Available Standard Inductors

Thermal Shutdown and Current Limit Protection

Moisture Sensitivity Level(MSL) Equals1

Applications

Simple High-Efficiency Step-Down(Buck) Regulator

Efficient Pre-Regulator for Linear Regulators

On-Card Switching Regulators

Positive to Negative Converter(Buck-Boost)

Negative Step-Up Converters

Power Supply for Battery Chargers

DESCRIPTION ORDERING INFORMATION

The LM2596 series of regulators are monolithic integratedcircuits ideally suited for easy and convenient design of astep-down switching regualtor(buck converter).All circuits of this series are capable of driving a 3.0A loadwith excellent line and load regulation.

These devices areavailable in fixed output voltages of 3.3V, 5.0V,12V, 15V,and an adjustable output version.These regulatiors were designed to minimize the number of externalcomponents to simplify thepower supply design.

Standard series of inductors optimized for use with the LM2576 are offeredby several different inductor manufacturers.Since the LM2596 converter is a switch-mode power supply, its efficiency is significantly higher incomparison with popular three-terminal limear reguators, especially with higher input voltages.available from several different manufacturers.

This feature greatly simplifies the design ofswitch-mode power supplies. The LM2596 features include a guaranteed +/- 4% toleranceon output voltage within specified input voltages and output load conditions, and +/-15% on theoscillator frequency (+/- 2% over 0oC to 125 oC).

External shutdown is included, featuring 80 uA(typical) standby current. The output switch includescycle-bycycle current limiting, as well as thermal shutdown for full protection under fault conditions.

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