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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.

Data Sheet
FULL DATA SHEET (PDF, 244kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
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

    Key Specifications:  Isolated Power Supplies
    Part Number VIN
    (V)    		 VIN
    (V)    		 Topology Features Cntrl. Loop Feedback Freq.
    (kHz)    		 Duty Cycle
    (%)    		 ISTARTUP
    (mA)    		 ICC
    (mA)    		 Oper. Temp.
    (°C)    		 Price
    min max min max max max See Notes
    MAX5074  11 76
    Flyback
    Two-Switch Forward
    Adjustable Frequency
    Internal Power MOSFET(s)
    Synchronous Rectifier Driver
    Thermal Shutdown
    UVLO
    		 Voltage Mode Opto 500 50 2 4.4 -40 to +125 $1.52 @1k
    See All Isolated Power Supplies (31)

    Diagram
    MAX5074: Typical Application Circuit
    Typical Application Circuit

    Application Notes
  		• Application Note 3363: New Ethernet Systems Distribute DC Power with Data - MAX5074
  		• Application Note 3581: MAX5074 5V, 3A Reference Design - MAX5074

    Evaluation Kits
  		• MAX5074EVKIT

    Reliability Reports
  		• Show FIT data for:
  		• Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-4 of 4

    MAX5074 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX5074AUP    
    		Active TSSOP-EP;20 pin;43 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0115 (PDF)
    Use pkgcode/variation: U20E-4*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5074AUP-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX5074AUP+  
    		Active TSSOP-EP;20 pin;43 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0115 (PDF)
    Use pkgcode/variation: U20E+4*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5074AUP+T    
    		Active TSSOP-EP;20 pin;43 mm²
    Outline Drawing: 21-0108 (PDF)
    Land Pattern: 90-0115 (PDF)
    Use pkgcode/variation: U20E+4*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• New Product Press Release 2004-08-05 

    Related Products
    MAX5941A, MAX5941B IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power Devices
    MAX5942A, MAX5942B IEEE 802.3af Power-Over-Ethernet Interface/PWM Controller for Power Devices
    MAX5940, MAX5940A, MAX5940B IEEE 802.3af PD Interface Controller for Power-Over-Ethernet

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    Document Ref.: 19-3312; Rev 0; 2004-07-30
    This page last modified: 2005-07-06


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