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+72V SOT23/TDFN Simple Swapper Hot-Swap Controllers

Product Details

The MAX5902/MAX5903 are hot-swap controllers that allow a circuit card to be safely hot plugged into a live backplane without causing a glitch on the power-supply rail. These devices operate from +9V to +72V and provide the simplest hot-swap solution by eliminating all external components except the external p-channel MOSFET.

The MAX5902/MAX5903 limit the inrush current to the load and provide a circuit-breaker function for overcurrent protection. During startup the circuit-breaker function is disabled and the MAX5902/MAX5903 limit the inrush current by gradually turning on the external MOSFET. Once the external MOSFET is fully enhanced, the circuit-breaker function is enabled and the MAX5902/MAX5903 provide overcurrent protection by monitoring the voltage drop across the external MOSFET's on-resistance.

The MAX5902/MAX5903 include an undervoltage lockout (UVLO) function, ON/active-low OFF control input, and a power-good status output, active-low PGOOD (MAX5902) or PGOOD (MAX5903). A built-in thermal shutdown feature is also included to protect the external MOSFET in case of overheating.

The MAX5902/MAX5903 offer latched or autoretry fault management and are available with 300mV, 400mV or 500mV circuit-breaker thresholds. Both the MAX5902 and MAX5903 are available in small SOT23 and TDFN packages, and are specified for the extended -40°C to +85°C temperature range. For specific ordering information, see the Selector Guide at the end of the data sheet.

Key Features

  • Wide +9V to +72V Operation
  • Requires No External Sense Resistor
  • Drives External p-Channel MOSFET
  • Limits Inrush Current
  • Circuit-Breaker Function
  • Less than 2mA Quiescent Current
  • ON/Active-Low OFF Input Permits Load Power-Supply Control and Sequencing
  • Adjustable Undervoltage Lockout
  • Power-Good Output with +72V Rating
  • Latching or Automatic Retry Fault Management
  • Thermal Shutdown Helps Protect the External MOSFET
  • Available in Two Small Packages
    • 6-Pin TDFN and SOT23

Applications/Uses

  • Base-Station Line Cards
  • Industrial Systems
  • Network Hubs, Switches, Routers
  • Network Hubs, Switches, Routers
  • RAID
  • Servers
Parametric specs for Hot Swap Controllers
VIN (V) (min) 9
VIN (V) (max) 72
# Channels 1
Circuit Breaker/ Current Limit Circuit Breaker
Circuit Breaker/Current Limit Threshold (mV) 300 to 500
Fault Condition Control Latched Off
Periodic Retry
Programmable
Positive/Negative Rail Positive
Features Requires No RSENSE
Package/Pins SOT23/6
TDFN/6
Budgetary
Price (See Notes)
$2.35 @1k
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Simplified Block Diagram

MAX5902, MAX5903: Typical Operating Circuit MAX5902, MAX5903: Typical Operating Circuit Zoom icon

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Parameters

Parametric specs for Hot Swap Controllers
VIN (V) (min) 9
VIN (V) (max) 72
# Channels 1
Circuit Breaker/ Current Limit Circuit Breaker
Circuit Breaker/Current Limit Threshold (mV) 300 to 500
Fault Condition Control Latched Off
Periodic Retry
Programmable
Positive/Negative Rail Positive
Features Requires No RSENSE
Package/Pins SOT23/6
TDFN/6
Budgetary
Price (See Notes)
$2.35 @1k

Key Features

  • Wide +9V to +72V Operation
  • Requires No External Sense Resistor
  • Drives External p-Channel MOSFET
  • Limits Inrush Current
  • Circuit-Breaker Function
  • Less than 2mA Quiescent Current
  • ON/Active-Low OFF Input Permits Load Power-Supply Control and Sequencing
  • Adjustable Undervoltage Lockout
  • Power-Good Output with +72V Rating
  • Latching or Automatic Retry Fault Management
  • Thermal Shutdown Helps Protect the External MOSFET
  • Available in Two Small Packages
    • 6-Pin TDFN and SOT23

Applications/Uses

  • Base-Station Line Cards
  • Industrial Systems
  • Network Hubs, Switches, Routers
  • Network Hubs, Switches, Routers
  • RAID
  • Servers

Description

The MAX5902/MAX5903 are hot-swap controllers that allow a circuit card to be safely hot plugged into a live backplane without causing a glitch on the power-supply rail. These devices operate from +9V to +72V and provide the simplest hot-swap solution by eliminating all external components except the external p-channel MOSFET.

The MAX5902/MAX5903 limit the inrush current to the load and provide a circuit-breaker function for overcurrent protection. During startup the circuit-breaker function is disabled and the MAX5902/MAX5903 limit the inrush current by gradually turning on the external MOSFET. Once the external MOSFET is fully enhanced, the circuit-breaker function is enabled and the MAX5902/MAX5903 provide overcurrent protection by monitoring the voltage drop across the external MOSFET's on-resistance.

The MAX5902/MAX5903 include an undervoltage lockout (UVLO) function, ON/active-low OFF control input, and a power-good status output, active-low PGOOD (MAX5902) or PGOOD (MAX5903). A built-in thermal shutdown feature is also included to protect the external MOSFET in case of overheating.

The MAX5902/MAX5903 offer latched or autoretry fault management and are available with 300mV, 400mV or 500mV circuit-breaker thresholds. Both the MAX5902 and MAX5903 are available in small SOT23 and TDFN packages, and are specified for the extended -40°C to +85°C temperature range. For specific ordering information, see the Selector Guide at the end of the data sheet.

Simplified Block Diagram

MAX5902, MAX5903: Typical Operating Circuit MAX5902, MAX5903: 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