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MAX5949A

Part Number	MAX5949A
Manufacturer	Maxim Integrated
Description	-48V Hot-Swap Controllers
Published	Mar 26, 2020
Detailed Description	19-3494; Rev 1; 8/11 MAX5949A/MAX5949B -48V Hot-Swap Controllers with External RSENSE General Description The MAX5949...
Datasheet	MAX5949A PDF File

Overview

19-3494; Rev 1; 8/11 MAX5949A/MAX5949B -48V Hot-Swap Controllers with External RSENSE General Description The MAX5949A/MAX5949B are hot-swap controllers that allow a circuit card to be safely hot plugged into a live backplane.
The MAX5949A/MAX5949B 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 MAX5949A/MAX5949B provide a controlled turn-on to circuit cards preventing glitches on the power-supply rail and damage to board connectors and components.
The MAX5949A/MAX5949B 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 MAX5949A and MAX5949B protect a system against overcurrent and short-circuit conditions by turning off the external MOSFET in the event of a fault condition.
The MAX5949A/MAX5949B also provide protection against input voltage steps.
During an input voltage step, the MAX5949A/MAX5949B 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 (PWRGD for the MAX5949A or PWRGD for the MAX5949B) that can be used to enable downstream converters.
The MAX5949A/MAX5949B are available in an 8-pin SO package.
Both devices are specified for the extended -40°C to +85°C temperature range.
Applications Telecom Line Cards Network Switches/Routers Central-Office Line Cards Server Line Cards Base-Station Line Cards Central-Office Switching -48V Distributed Power Systems Negative Power-Supply Controls Typical Operating Circuit and Selector Guide appear at end of data sheet.
Features o Allow Safe Board Insertion and Removal from a Live -48V Backplane o Pin and Function Compatible with LT4250L (MAX5949A) o Pin Compatible with LT1640L (MAX5949A) o Pin and Function Compatible with LT4250H (MAX5949B) o Pin Compatible with LT1640H (MA...

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