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-48V Hot-Swap Controller with VIN Step Immunity, No RSENSE, and Overvoltage Protection

Product Details

Key Features

Parametric specs for Hot Swap Controllers
VIN (V) (min) -10
VIN (V) (max) -80
# Channels 1
Circuit Breaker/ Current Limit Circuit Breaker
Circuit Breaker/Current Limit Threshold (mV) Adjustable
Fault Condition Control Periodic Retry
Positive/Negative Rail Negative
Package/Pins QSOP/16
Budgetary
Price (See Notes)
3.39
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Simplified Block Diagram

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Parameters

Parametric specs for Hot Swap Controllers
VIN (V) (min) -10
VIN (V) (max) -80
# Channels 1
Circuit Breaker/ Current Limit Circuit Breaker
Circuit Breaker/Current Limit Threshold (mV) Adjustable
Fault Condition Control Periodic Retry
Positive/Negative Rail Negative
Package/Pins QSOP/16
Budgetary
Price (See Notes)
3.39

Key Features

  • -10V to -80V Operation
  • No External RSENSE Required
  • Drives Large Power MOSFETS
  • Eliminates Inrush Current Spikes During Hot Plug into Powered Backplane
  • Eliminates Inrush Current Spikes and Dropping of Load During Large VIN Steps
  • Adjustable Circuit-Breaker Threshold with Temperature Compensation
  • Circuit-Breaker Fault with Transient Rejection
  • Shorted Load Detection (Load Probe) Before Power MOSFET Turn-On
  • Programmable Load-Voltage Slew Rate Controls Inrush Current
  • ±2.4% Accuracy, Programmable Turn-On/Off Voltage (UVLO)
  • Overvoltage Fault Protection with Transient Rejection
  • Autoretry and Latched Fault Management Available
  • Low Quiescent Current (1mA)

Applications/Uses

  • Network Hubs, Switches, Routers
  • Network Hubs, Switches, Routers
  • Servers
  • Solid-State Circuit Breakers
  • Telecom Line Cards

Description

The MAX5938 is a hot-swap controller for -10V to -80V rails. The MAX5938 allows circuit line cards to be safely hot-plugged into a live backplane without causing a glitch on the power supply. It integrates an adjustable circuit-breaker function requiring no RSENSE.

The MAX5938 provides a controlled turn-on for circuit cards, which limits inrush current and prevents both glitches on the power-supply rail and damage to board connectors and components. Before startup, the MAX5938 performs a Load Probe™ test to detect the presence of a short-circuit condition. If a short-circuit condition does not exist, the device limits the inrush current drawn by the load by gradually turning on the external MOSFET. Once the external MOSFET is fully enhanced, the MAX5938 provides overcurrent and shortcircuit protection by monitoring the voltage drop across the RDS(ON) of the external power MOSFET. The MAX5938 integrates a 400mA fast GATE pulldown to guarantee that the external MOSFET is rapidly turned off in the event of an overcurrent or short-circuit condition.

The MAX5938 also protects the system against input voltage (VIN) steps. During an input voltage step, the device limits the current drawn by the load to a safe level without shutting down the load. The device also includes ON/OFF control, selectable PGOOD output polarity, undervoltage (UV) and overvoltage (OV) protection.

The device offers latched (MAX5938L) or autoretry (MAX5938A) fault management. Both the MAX5938A and MAX5938L are available in a 16-pin QSOP package and are specified for the extended (-40°C to +85°C) temperature range.

Simplified Block Diagram

MAX5938: Typical Operating Circuit MAX5938: 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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.