General Description

The MAX5052/MAX5053 current-mode PWM controllers contain all the control circuitry required for the design of wide-input-voltage isolated and nonisolated power supplies. The MAX5052 is well suited for universal input (rectified 85VAC to 265VAC) or telecom (-36VDC to -72VDC) power supplies. The MAX5053 is well suited for low-input-voltage (10.8VDC to 24VDC) power supplies.

Features

♦ Available in a Tiny 8-Pin µMAX Package

♦ Current-Mode Control

♦ 50W Output Power

♦ Universal Offline Input Voltage Range

   Rectified 85VAC to 265VAC (MAX5052)

♦ VIN Directly Driven from 10.8V to 24V Input

   (MAX5053)

♦ Digital Soft-Start

♦ Programmable Input Startup Voltage

♦ Internal Bootstrap UVLO with Large Hysteresis

   (MAX5052)

♦ Internal Error Amplifier with 1 Accurate

   Reference

♦ Thermal Shutdown

♦ 45µA (typ) Startup Supply Current

♦ 1.4mA (typ) Operating Supply Current

♦ Fixed Switching Frequency of 262kHz ±12

♦ 50 Maximum Duty-Cycle Limit

   (MAX5052A/MAX5053A)

♦ 75 Maximum Duty-Cycle Limit

   (MAX5052B/MAX5053B)

♦ 60ns Cycle-by-Cycle Current-Limit Response Time

Applications

   Universal Input AC Power Supplies

   Isolated Telecom Power Supplies

   Networking Systems

   Computer Systems/Servers

   Industrial Power Conversion

   Isolated Keep-Alive Circuits

   12V Boost Regulators

   12V SEPIC Regulators