LM2576BM 데이터 시트보기 (PDF) - Tiger Electronic

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LM2576BM

3A Step-Down Voltage Regulator

Tiger Electronic 

TIGER ELECTRONIC CO.,LTD

3A Step-Down Voltage Regulator LM2576BM

DESCRIPITION

The LM2576BM series of regulators are monolithic integrated circuits that provide all the

active functions for a step-down (buck) switching regulator, capable of driving 3A load

with excellent line and load regulation. These devices are available in fixed output voltages

of 3.3V, 5V, 12V and an ADJ 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 LM2576BM series offers a high-efficiency replacement for popular three-terminal linear

regulators. It substantially reduces the size of the heat sink, and in some cases no heat sink

is required. A standard series of inductors optimized for use with the LM2576BM 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

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

z Guaranteed 3A output current

z Adjustable version output voltage range,1.23V to

37V±4% max over line and load conditions

z 52 kHz fixed frequency internal oscillator

z TTL shutdown capability, low power standby mode

z High efficiency

z Uses readily available standard inductors

z Thermal shutdown and current limit protection

z Wide input voltage range up to 40V

z Requires only 4 external components

APPLICATIONS

z Simple high-efficiency

step-down (buck) regulator

z Efficient pre-regulator for

linear regulators

z On-card switching regulators

z Positive to negative

converter (Buck-Boost)

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