1A, 52kHz, Step-Down Switching Regulator

LM2575

FEATURES

3.3V, 5.0V, 12V, 15V, and Adjustable Output Versions

Adjustable Version Output Voltage Range, 1.23 to 37V

+/- 4% AG10 Maximum Over Line and Load Conditions

Guaranteed 1A Output Current

Wide Input Voltage Range

Requires Only 4 External Components

52kHz 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 3

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 LM2575 series of regulators are monolithic integrated

circuits ideally suited for easy and convenient design of a

step-down switching regualtor(buck converter).

All circuits of this series are capable of driving a 1A load

with excellent line and load regulation. These devices are

available 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 the

power supply design. Standard series of inductors optimized for use with the LM2575 are offered

by several different inductor manufacturers.

Since the LM2575 converter is a switch-mode power supply, its efficiency is significantly higher in

comparison with popular three-terminal limear reguators, especially with higher input voltages.

available from several different manufacturers. This feature greatly simplifies the design of

switch-mode power supplies. The LM2575 features include a guaranteed +/- 4% tolerance

on output voltage within specified input voltages and output load conditions, and +/-10% on the

oscillator frequency (+/- 2% over 0℃ to 125 ℃).

External shutdown is included, featuring 80 ㎂(typical) standby current. The output switch includes

cycle-bycycle current limiting, as well as thermal shutdown for full protection under fault conditions.

2008 - Ver. 1.0

HTC

−

1 −

Device

Marking

Package

LM2575T-X.X

LM2575T-X.X

TO-220

In many cases, the power dissipated is so low that no heatsink is required or its size could

be reduced dramatically. A standard series of inductors optimized for use with the LM2575 are

LM2575TV-X.X

LM2575T-X.X

LM2575R

LM2575R-X.X

TO-263

TO-220V

1. Vin 2. Output

3. Ground

4. Feedback 5. On/Off

1

5

1

5

1

5

TO-220 PKG

TO-263 PKG

TO-220V PKG