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MAX5074 Power IC with Integrated MOSFETs for Isolated IEEE 802.3af PD and Telecom Power-Supply Applications

IEEE 802.3af Power-Supply IC Integrates Power MOSFETs, Reducing Power-Supply Size and Cost for POE

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Status

Active: In Production.

Description

FULL DATA SHEET (PDF, 244kB)

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The MAX5074 isolated PWM power IC features integrated switching power MOSFETs connected in a voltageclamped, 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 lookahead 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.

An evaluation kit is available: MAX5074EVKIT

Key Features Applications/Uses

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 0.4 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

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