LM1575/LM2575/LM2575HV

SIMPLE SWITCHER^® 1A Step-Down Voltage Regulator

General Description

The LM2575 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load with excellent line and load regulation. These devices are available 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 LM2575 series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces the size of the heat sink, and in many cases no heat sink is required.

A standard series of inductors optimized for use with the LM2575 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a guaranteed ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50 µA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

Features

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

• Adjustable version output voltage range,

1.23V to 37V (57V for HV version) ±4% max over line and load conditions

• Guaranteed 1A output current

• Wide input voltage range, 40V up to 60V for HV version

• Requires only 4 external components

• 52 kHz fixed frequency internal oscillator

• TTL shutdown capability, low power standby mode

• High efficiency

• Uses readily available standard inductors

• Thermal shutdown and current limit protection

• P+ Product Enhancement tested

Applications

• Simple high-efficiency step-down (buck) regulator

• Efficient pre-regulator for linear regulators

• On-card switching regulators

• Positive to negative converter (Buck-Boost)

Typical Application (Fixed Output Voltage Versions)

Note: Pin numbers are for the TO-220 package.

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Maximum Supply Voltage

LM1575/LM2575 45V

LM2575HV 63V

ON /OFF Pin Input Voltage −0.3V ≤ V ≤ +V_IN

Output Voltage to Ground (Steady State) −1V

Power Dissipation Internally Limited

Storage Temperature Range −65˚C to +150˚C

Maximum Junction Temperature 150˚C

Minimum ESD Rating (C = 100 pF, R = 1.5 kΩ) 2 kV

Lead Temperature (Soldering, 10 sec.) 260˚C

Operating Ratings

Temperature Range

LM1575 −55˚C ≤ T_J ≤ +150˚C

LM2575/LM2575HV −40˚C ≤ T_J ≤ +125˚C

Supply Voltage

LM1575/LM2575 40V

LM2575HV 60V

Stock Offer (Hot Sell)

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