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-48V Hot-Swap Controllers with External RSENSE

Product Details

Key Features

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Simplified Block Diagram

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Parameters

Key Features

  • Allow Safe Board Insertion and Removal from a Live -48V Backplane
  • Pin- and Function-Compatible with LT1640AL/LT1640L (MAX5948A)
  • Pin- and Function-Compatible with LT1640AH/LT1640H (MAX5948B)
  • Withstand -100V Input Transients with No External Components
  • Operate from -20V to -80V
  • Programmable Inrush and Short-Circuit Current Limits
  • Programmable Overvoltage Protection
  • Programmable Undervoltage Lockout
  • Power Up into a Shorted Load
  • Power-Good Control Output

Applications/Uses

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

Description

The MAX5948A/MAX5948B are hot-swap controllers that allow a circuit card to be safely hot plugged into a live backplane. The MAX5948A/MAX5948B operate from -20V to -80V and are well-suited for -48V power systems. The MAX5948A is pin- and function-compatible with both the LT1640AL and LT1640L. The MAX5948B is pin- and function-compatible with both the LT1640AH and LT1640H.

The MAX5948A/MAX5948B provide a controlled turn-on to circuit cards preventing glitches on the power-supply rail and damage to board connectors and components. The MAX5948A/MAX5948B 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 MAX5948A and MAX5948B protect a system against overcurrent and short-circuit conditions by turning off the external MOSFET in the event of a fault condition.

Both devices feature an open-drain power-good status output, active-low PWRGD for MAX5948A or PWRGD for MAX5948B, that can be used to enable downstream converters.

The MAX5948A/MAX5948B 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

MAX5948A, MAX5948B: Block Diagram MAX5948A, MAX5948B: Block Diagram 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.