MAX5920

PRODUCTION

-48V Hot-Swap Controller with External RSENSE

Hot-Swap Controller with External RSENSE Well-Suited for -48V Power Systems

Data Sheet (Rev. 0) Product Selection Table
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Overview

  • Allows Safe Board Insertion and Removal from a Live -48V Backplane
  • Pin- and Function-Compatible with LT4250L (MAX5920A)
  • Pin-Compatible with LT1640L (MAX5920A)
  • Pin- and Function-Compatible with LT4250H (MAX5920B)
  • Pin-Compatible with LT1640H (MAX5920B)
  • Circuit-Breaker Immunity to Input Voltage Steps and Current Spikes
  • Withstands -100V Input Transients with No External Components
  • Programmable Inrush and Short-Circuit Current Limits
  • Operates from -20V to -80V
  • Programmable Overvoltage Protection
  • Programmable Undervoltage Lockout
  • Powers Up into a Shorted Load
  • Power-Good Control Output
  • Thermal Shutdown Protects External MOSFET
MAX5920
-48V Hot-Swap Controller with External RSENSE
MAX5920: Typical Operating Circuit
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Documentation

Data Sheet 1

Technical Articles 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Hot Swap Controllers 2
MAX5900
PRODUCTION -100V, SOT23/TDFN, Simple Swapper Hot-Swap Controllers
MAX5901
PRODUCTION -100V, SOT23/TDFN, Simple Swapper Hot-Swap Controllers
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • MAX5920A
  • MAX5920B

SPICE Model 4

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

MAX5921AEVKIT

Evaluation Kit for the MAX5920, MAX5921, and MAX5939

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Features and Benefits

  • Evaluates MAX5920A/B (LT1640/LT4250 Pin-Compatible)
  • Withstands -100V Input Transients
  • Circuit Breaker Immune to Input Voltage Steps and Current Spikes
  • Input Undervoltage/Overvoltage Thresholds Configured for -32V and -80V
  • Configured to 1.8A Output Current
  • Demonstrates Unique Current Regulation Architecture
  • Programmable Current Limit
  • Programmable Output Undervoltage/Overvoltage Monitoring
  • Evaluates Other MAX5920/MAX5921/MAX5939 Hot-Swap Controllers (IC Replacement Required)
  • Surface-Mount Components
  • Fully Assembled and Tested

Product Details

The MAX5921A evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that provides current-limiting and multilevel fault protection using the MAX5921A hot-swap controller. The EV kit demonstrates the autoretry, configurable input undervoltage, overvoltage, and overcurrent monitoring features of the MAX5921A. The MAX5921A controls an external N-channel MOSFET to provide load-current regulation.

The EV kit circuit undervoltage and overvoltage thresholds are configured to -32V and -80V, respectively, which makes the EV kit well suited for -48V telecom systems. The input operating voltage range is -20V to -80V (-48V rail systems). The EV kit is designed to withstand -100V input transients. The current-limiting threshold is configured for 1.8A output current.

The EV kit can also be used to evaluate different versions of the MAX5920, MAX5921, or MAX5939 hot-swap controllers after removing the MAX5921A.

The MAX5920A/B are pin- and function-compatible with the LT4250 hot-swap controllers and pin-compatible with LT1640.

Warning: The MAX5921A EV kit is designed to operate with high voltages. Dangerous voltages are present on this EV kit and on equipment connected to it. Users who power up this EV kit or power the sources connected to it must be careful to follow safety procedures appropriate to working with high-voltage electrical equipment.

Under severe fault or failure conditions, this EV kit may dissipate large amounts of power, which could result in the mechanical ejection of a component or of component debris at high velocity. Operate this kit with care to avoid possible personal injury.

The EV kit user should not probe the circuit with an oscilloscope probe and ground clip unless they have "high-voltage, hot-swap experience."

 

Applications

  • Base-Station Line Cards
  • Central-Office Line Cards
  • Network Routers and Switches
  • Server Line Cards
  • Telecom Line Cards
MAX5921AEVKIT
Evaluation Kit for the MAX5920, MAX5921, and MAX5939

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