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-48V Hot-Swap Controller with External RSENSE

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

Product Details

The MAX5920A/MAX5920B are hot-swap controllers that allow a circuit card to be safely hot plugged into a live backplane. The MAX5920A/MAX5920B operate from -20V to -80V and are well-suited for -48V power systems. These devices are pin and function compatible with the LT4250 and pin compatible with the LT1640.

The MAX5920A/MAX5920B provide a controlled turn-on to circuit cards preventing glitches on the power-supply rail and damage to board connectors and components. The MAX5920A/MAX5920B provide undervoltage, overvoltage, and overcurrent protection. These devices ensure the input voltage is stable and within tolerance before applying power to the load.

Both the MAX5920A and MAX5920B protect a system against overcurrent and short-circuit conditions by turning off the external MOSFET in the event of a fault condition. The MAX5920A/MAX5920B also provide protection against input voltage steps. During an input voltage step, the MAX5920A/MAX5920B limit the current drawn by the load to a safe level without turning off power to the load.

Both devices feature an open-drain power-good status output (active-low PWRGD for the MAX5920A or PWRGD for the MAX5920B) that can be used to enable downstream converters. A built-in thermal-shutdown feature is also included to protect the external MOSFET in case of overheating.

The MAX5920A/MAX5920B are available in an 8-pin SO package. Both devices are specified for the extended -40°C to +85°C temperature range.

Key Features

  • 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

Applications/Uses

  • Base-Station Line Cards
  • Central-Office Line Cards
  • Network Routers and Switches
  • Server Line Cards
  • Telecom Line Cards
Parametric specs for Hot Swap Controllers
VIN (V) (min) -20
VIN (V) (max) -80
# Channels 1
Circuit Breaker/ Current Limit Current Limit
Circuit Breaker/Current Limit Threshold (mV) 50
Fault Condition Control Latched Off
Positive/Negative Rail Negative
Features Undervoltage/Overvoltage Protection
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
$2.66 @1k
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Simplified Block Diagram

MAX5920: Typical Operating Circuit MAX5920: Typical Operating Circuit Zoom icon

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Parameters

Parametric specs for Hot Swap Controllers
VIN (V) (min) -20
VIN (V) (max) -80
# Channels 1
Circuit Breaker/ Current Limit Current Limit
Circuit Breaker/Current Limit Threshold (mV) 50
Fault Condition Control Latched Off
Positive/Negative Rail Negative
Features Undervoltage/Overvoltage Protection
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
$2.66 @1k

Key Features

  • 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

Applications/Uses

  • Base-Station Line Cards
  • Central-Office Line Cards
  • Network Routers and Switches
  • Server Line Cards
  • Telecom Line Cards

Description

The MAX5920A/MAX5920B are hot-swap controllers that allow a circuit card to be safely hot plugged into a live backplane. The MAX5920A/MAX5920B operate from -20V to -80V and are well-suited for -48V power systems. These devices are pin and function compatible with the LT4250 and pin compatible with the LT1640.

The MAX5920A/MAX5920B provide a controlled turn-on to circuit cards preventing glitches on the power-supply rail and damage to board connectors and components. The MAX5920A/MAX5920B provide undervoltage, overvoltage, and overcurrent protection. These devices ensure the input voltage is stable and within tolerance before applying power to the load.

Both the MAX5920A and MAX5920B protect a system against overcurrent and short-circuit conditions by turning off the external MOSFET in the event of a fault condition. The MAX5920A/MAX5920B also provide protection against input voltage steps. During an input voltage step, the MAX5920A/MAX5920B limit the current drawn by the load to a safe level without turning off power to the load.

Both devices feature an open-drain power-good status output (active-low PWRGD for the MAX5920A or PWRGD for the MAX5920B) that can be used to enable downstream converters. A built-in thermal-shutdown feature is also included to protect the external MOSFET in case of overheating.

The MAX5920A/MAX5920B are available in an 8-pin SO package. Both devices are specified for the extended -40°C to +85°C temperature range.

Simplified Block Diagram

MAX5920: Typical Operating Circuit MAX5920: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal