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Maxim > Products > [Hot-Swap and Power Switching] 
MAX5941A, MAX5941B
IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power Devices

Industry's First Fully Integrated IEEE 802.3af-Compliant Power-over-Ethernet Power-Supply ICs


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 380kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX5941A/MAX5941B integrate a complete power IC for powered devices (PD) in a power-over-ethernet (PoE) system. The MAX5941A/MAX5941B provide a PD interface and a compact DC-DC PWM controller suitable for flyback and forward converters in either isolated or nonisolated designs.

The MAX5941A/MAX5941B PD interface complies with the IEEE® 802.3af standard, providing the PD with a detection signature, a classification signature, and an integrated isolation switch with programmable inrush current control. These devices also feature power-mode undervoltage lockout (UVLO) with wide hysteresis and power-good status outputs.

The MAX5941A/MAX5941B also integrate all the building blocks necessary for implementing DC-DC fixed-frequency isolated power supplies. These devices are a current-mode controller with an integrated high startup circuit suitable for isolated telecom/industrial voltage-range power supplies. A high-voltage startup circuit allows the PWM controller to draw power directly from the 18V to 67V input supply during startup. The switching frequency is internally trimmed to 275kHz ±10%, thus reducing magnetics and filter components. The MAX5941A allows an 85% operating duty cycle and can be used to implement flyback converters. The MAX5941B limits the operating duty cycle to less than 50% and can be used in single-ended forward converters. The MAX5941A/MAX5941B are designed to work with or without an external diode bridge in front of the PD.

The MAX5941A/MAX5941B are available in 16-pin SO packages.

An evaluation kit is available:  MAX5941BEVKIT  

Key Features   Applications/Uses
  • Powered Device Interface
    • Fully Integrated IEEE 802.3af-Compliant PD Interface
    • PD Detection and Programmable Classification Signatures
    • Less than 10µA Leakage Current Offset During Detection
    • Integrated MOSFET for Isolation and Inrush Current Limiting
    • Gate Output Allows External Control of the Internal Isolation FET
    • Programmable Inrush Current Control
    • Programmable Undervoltage Lockout
  • PWM Controller
    • Wide Input Range: 18V to 67V
    • Current-Mode Control
    • Leading-Edge Blanking
    • Internally Trimmed 275kHz ±10% Oscillator
    • Soft-Start

 
  		• Computer Telephony
  		• Internet Appliances
  		• IP Phones
  		• Power Devices in Power-Over-Ethernet/Power-Over-MDI
  		• Security Cameras
  		• Wireless Access Nodes

    Key Specifications:  Powered Devices
    Part Number IEEE Compliance RDS(ON)
    (Ω)    		 PWM fS
    (kHz)    		 Protection Features Prog. UVLO Package/Pins Smallest Available Pckg.
    (mm2)    		 Oper. Temp.
    (°C)    		 Price
    PD MOSFET max w/pins See Notes
    MAX5941  802.3af 0.6 Yes 275 Programmable Inrush Current Yes
    SOIC(N)/16
    		 62 -40 to +85 $2.07 @1k
    See All Powered Devices (4)

    Diagram
    MAX5941A, MAX5941B: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 3363: New Ethernet Systems Distribute DC Power with Data - MAX5941
  		• Application Note 3430: A Triple-Output ±5% Regulated High Efficiency POE (Power over Ethernet) Supply - MAX5941A
  		• Application Note 3912: Low-Cost, Complete Power Solution for Powered Devices Includes a 12V Buck Converter - MAX5941
  		• Application Note 4161: PoE+ Circuit Delivers 13W to 70W for Powered Devices (PDs) - MAX5941
  		• Application Note 4162: Reference Design for a Powered-Device (PD) Module Based on the MAX5941B PWM Controller - MAX5941B
  		• Application Note 4163: Telecom Hot-Swap Reference Design Is Immune to Overvoltage and Brownout Input Transients - MAX5941

    Evaluation Kits
  		• MAX5941BEVKIT

    Design Guides
  		• Power Management for Battery-Powered Equipment (PDF)

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

    Software/Models
  		• MAX5941 Macromodel
  		• MAX5941 Orcad Library
  		• MAX5941TR Test Circuit File

    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: 1-16 of 16

    MAX5941A Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX5941ACSE    
    		Active SOIC(N);16 pin;62 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0097 (PDF)
    Use pkgcode/variation: S16M-6*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5941ACSE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX5941AESE    
    		Active SOIC(N);16 pin;62 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0097 (PDF)
    Use pkgcode/variation: S16M-6*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5941AESE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX5941ACSE+  
    		Active SOIC(N);16 pin;62 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0097 (PDF)
    Use pkgcode/variation: S16M+6*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5941ACSE+T    
    		Active SOIC(N);16 pin;62 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0097 (PDF)
    Use pkgcode/variation: S16M+6*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5941AESE+  
    		Active SOIC(N);16 pin;62 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0097 (PDF)
    Use pkgcode/variation: S16M+6*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5941AESE+T    
    		Active SOIC(N);16 pin;62 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0097 (PDF)
    Use pkgcode/variation: S16M+6*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5941B Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX5941BCSE    
    		Active SOIC(N);16 pin;62 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0097 (PDF)
    Use pkgcode/variation: S16M-6*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5941BCSE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX5941BESE    
    		Active SOIC(N);16 pin;62 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0097 (PDF)
    Use pkgcode/variation: S16M-6*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX5941BESE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX5941BCSE+  
    		Active SOIC(N);16 pin;62 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0097 (PDF)
    Use pkgcode/variation: S16M+6*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5941BCSE+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX5941BESE+  
    		Active SOIC(N);16 pin;62 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0097 (PDF)
    Use pkgcode/variation: S16M+6*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX5941BESE+T    
    		Active SOIC(N);16 pin;62 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0097 (PDF)
    Use pkgcode/variation: S16M+6*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• New Product Press Release 2004-01-06 

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    Document Ref.: 19-3069; Rev 4; 2006-06-29
    This page last modified: 2007-08-22


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