Features

3.3V, 5V, 12V, 15V and adjustable

output versions

Adjustable version output voltage

range, 1.23V to 30V ±4 max over

line and load conditions

Guaranteed 3A output current

Input voltage up to 45V

Requires only 4 external components

52KHz fixed frequency internal

oscillator

TTL shutdown capability, low power

standby mode

High efficiency

Thermal shutdown and current limit

protection

Applications

Simple high-efficiency step-down

(buck) regulator

Efficient pre-regulator for linear

regulators

Positive to negative converter

(BucK-Boost)

General Description

The AE2576 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,

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.

A standard series of inductors optimized

for use with the AE2576 are available from

several different manufacturers. This

feature greatly simplifies the design of

switch-mode power supplies.

Others 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 in included,

featuring 50µA (typical) standby current.

The output switch includes cycle-by-cycle

current limiting, as well as thermal

shutdown for full protection under fault

conditions.