降低电压开关3A调节器--AT2576

一 概述

The AT2576 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator,functions for a step-down (buck) switching regulator,load regulation. These devices are available in fixed output voltages of 3.3V, 5V and an adjustable 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 are available from several different manufacturers optimized for use with the AT2576 series. This feature greatly simplifies the design of switch-mode power supplies.The output voltage is guaranteed to ±3% tolerance under specified input voltage and output load conditions. The oscillator frequency is guaranteed to±10%. External shutdown is included, featuring typically 50μA standby current. Self-features include a two stage frequency current limit for the output switch and an temperature shutdown for complete protection under fault conditions.

二 特性

Standard TO-220-5L, TO-263-5L, PSOP-8 Package
3.3V, 5V, and Adjustable Output Versions
Adjustable Version Output Voltage Range 1.23V to 37V
VOUT Accuracy is to ±3% Under Specified Input output voltages of 3.3V, 5V and an adjustable output
Voltage the Output Load Conditions
Input Voltage Range Up to 40V
Requires Only 4 External Components with High Efficiency
TTL Shutdown Capability, Low Power Standby Mode
Built-in Thermal Shutdown, Current Limit Protection
Uses Standard Inductors
52 KHz Fixed Frequency Internal Oscillator

三 应用

Pre-Regulator for Linear Regulators protection
High-Efficiency Step-Down Buck Regulator reducing
On-Card/ Board Switching Regulators over
Positive to Negative Converter(Buck)

四 封装

五 应用电路图