General Description

The MAX17499/MAX17500 current-mode PWM controllers contain all the control circuitry required for the design of wide-input-voltage isolated and nonisolated power supplies. The MAX17499 is  well suited for low input voltage (9.5V DC to 24V DC) power supplies. The MAX17500 is well suited for universal input (rectified 85V AC to 265V AC) or telecom (-36V DC to -72V DC) power supplies.

Features

♦ Current-Mode Control

♦ Programmable Switching Frequency Up to 625kHz

♦ Accurate UVLO Threshold (1)

♦ Open-Drain UVLO Flag Output with Internal Delay

♦ 36V to 72V Telecom Voltage Range

♦ Universal Offline Input Voltage Range Rectified 85V AC to 265V AC (MAX17500)

♦ 9.5V to 24V Input (MAX17499)

♦ Digital Soft-Start

♦ Internal Bootstrap UVLO with Large Hysteresis (MAX17500)

♦ Internal Error Amplifier with 1.5 Accurate Reference

♦ 50µA (typ) Startup Supply Current

♦ 50 Maximum Duty-Cycle Limit (MAX17499A/MAX17500A)

♦ 75 Maximum Duty-Cycle Limit (MAX17499B/MAX17500B)

♦ 60ns Cycle-by-Cycle Current-Limit Propagation Delay

♦ Available in Tiny 10-Pin µMAX Packages

Applications

    1/2, 1/4, and 1/8 Brick Power Modules

    High-Efficiency, Isolated Telecom Power Supplies

    Networking/Servers

    Isolated Keep-Alive Power Supplies

    12V Boost and SEPIC Regulators

    Isolated and Nonisolated High-Brightness LED Power Supplies

    Industrial Power Conversion