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

Overview

Technical Documents

Ordering Info

Status

Part Number	Status
MAX5074A	Custom Order: Minimum order quantities and other restrictions may apply.

Description

The MAX5074A 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 MAX5074A is rated for operation over the -40°C to +125°C temperature range and is available in a 20-pin TSSOP package.

Warning: The MAX5074A is designed to work with high voltages. Exercise caution.

Data Sheet

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Custom Order

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

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-3312 Rev 0; 2011-04-27
This page last modified: 2011-04-28