General Description

The MAX5058/MAX5059 enable secondary-side synchronous rectification in isolated power supplies using widely available power MOSFETs. These devices facilitate the commutation of the secondary-side MOSFETs by providing a clean gate-drive signal that is synchronized to the power MOSFET switching in the primary side of the isolation transformer.

Features

♦ Clean Drive Waveforms for Synchronous

   MOSFETs

♦ Utilization of a Look-Ahead Signal from the

   Primary for Proper Turn-On/Turn-Off Times

♦ Synchronous Rectifier Drivers Capable of

   Sourcing and Sinking Up to 2A Peak Current

♦ Internal Gate-Voltage Regulator for 5V (MAX5058)

   or 10V (MAX5059) Gate-Drive Voltage

♦ Internal Error Amplifier

♦ Accurate Differential Current-Share/Force Circuit

   Allows Paralleling of Several Power Supplies for

   High Output Current

♦ Internal Remote Voltage-Sense Amplifier

♦ Flexible Reference-Voltage Generation

♦ Output Voltage Regulation Down to 0.5V

♦ Low Quiescent Current Consumption of 2.5mA

♦ Integrated Digital Output Margining Circuit Saves

   External Parts and Board Space

♦ 30ns Propagation Delay Time from Pulse Input

   to Output

♦ Automatic Detection of Discontinuous Current

   Conduction and Turn-Off of the Freewheeling

   MOSFET

♦ High Efficiency at Low Output Currents and

   Reverse-Current Protection

♦ Open-Drain Overtemperature Warning Flag

♦ 28-Pin Thermally Enhanced TSSOP Package

Applications

   Isolated Telecom Power Supplies

   Isolated Networking Power Supplies

   ±48V Power-Supply Modules

   Industrial Power Supplies

   ±48V/±12V Server Power Supplies