MAX5074

Power IC with Integrated MOSFETs for Isolated IEEE 802.3af PD and Telecom Power-Supply Applications

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Status Explanations for product status codes

All versions are Not Recommended for New Designs.

Description

The MAX5074 isolated PWM power IC features integrated switching power MOSFETs connected in a voltage-clamped, two-transistor, power-circuit configuration. This device can be used in both forward and flyback configurations with a wide input voltage range from 11V to 76V and up to 15W of output power.

The voltage-clamped power topology enables full recovery of stored magnetizing and leakage inductive energy for enhanced efficiency and reliability. A look-ahead signal for driving secondary-side synchronous rectifiers can be used to increase efficiency.

A wide array of protection features includes UVLO, overtemperature shutdown, and short-circuit protection with hiccup current limit for enhanced performance and reliability. Operation up to 500kHz allows smaller external magnetics and capacitors.

The MAX5074 is rated for operation over the -40°C to +125°C temperature range and is available in a 20-pin TSSOP package.

Warning: The MAX5074 is designed to work with high voltages. Exercise caution.
 

Data Sheet

Key Features

  • Clamped, Two-Switch Power IC for High Efficiency
  • No Reset Winding Required
  • Up to 15W Output Power
  • Bias Voltage Regulator with Automatic High-Voltage Supply Turn-Off
  • 11V to 76V Wide Input Voltage Range
  • Integrated High-Voltage 0.4Ω Power MOSFETs
  • Feed-Forward Voltage-Mode Control For Fast Input Transient Rejection
  • Programmable Brownout Undervoltage Lockout
  • Internal Overtemperature Shutdown
  • Indefinite Short-Circuit Protection with Programmable Fault Integration
  • Integrated Look-Ahead Signal for Secondary-Side Synchronous Rectification
  • > 90% Efficiency with Synchronous Rectification
  • Up to 500kHz Switching Frequency
  • High-Power (1.74W), Small-Footprint 20-Pin Thermally Enhanced TSSOP Package
 

Applications/Uses

  • 48V Input, Isolated Power-Supply Modules
  • ADSL Line Cards
  • ADSL Line-Driver Power Supplies
  • Distributed Power Systems with 48V Bus
  • High-Efficiency Telecom/Datacom Power Supplies
  • IEEE 802.3af PD Power Supplies
  • Isolated IP Phone Power Supplies
  • WLAN Access-Point Power Supplies
   

Diagram

MAX5074: Typical Application Circuit
Typical Application Circuit

More Information

New Product Press Release 2004-08-05 ]

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Information Index

Document Ref.: 19-3312 Rev 0; 2004-07-30
This page last modified: 2010-08-13




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