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
Applications/Uses
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
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