60V/3A 150kHz DC-DC巴克调节器--AT2593

一 概述

AT2593 of regulators provides all the active functions for a step-down (buck) switching regulator,and drives 3A load with excellent line and load regulation. AT2593 is available in fixed output voltages of 5V and an adjustable output version.Regulators are simple to use and require a minimum number of external components. Features include internal frequency compensation and a fixed-frequency oscillator. The AT2593 is high efficiency replacements for popular three terminal linear regulators, and requiring a smaller heat-sink or even no heat-sink.AT2593 performs well with standard inductors from several manufacturers and simplifying the design of switch mode power supplies External shut-down is included with typical 100uA The output switch has regulator cycle-by-cycle current limiting as well as thermal shut-down for full protection under fault conditions.
AT2593 operates at a switching frequency of 150 kHz thus allowing smaller size filter components than what would be needed with lower frequency switching regulators. Available in a 5-lead TO-220、TO-263 surface mount package and power PSOP8 package.

二 特性

5V, and adjustable output versions
Adjustable version output voltage range,
1.23V to 57V with ±4% max over line and
load conditions
3A output load current
Input voltage range : 1.2V to 57V
Requires only 4 external components
150 kHz fixed frequency internal oscillator
TTL shutdown capability
Low power standby mode, Istb typically 30 µA
High efficiency
Uses readily available standard inductors
Thermal shutdown and current limit protection

三 应用

Simple high-efficiency step-down (buck)
Pre-regulator for linear regulators
On-card/boards witching regulators
Positive to negative converter (buck-boost).

四 封装

五 应用电路图