72V SOT23/TDFN Simple Swapper Hot-Swap Controllers

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.

Applications

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

* 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