MAX5977B Datasheet | Maxim Integrated

Description The MAX5977A/MAX5977B hot-swap controllers provide plete protection for systems with a 1V to 16V singlesupply voltage. During the initial insertion, the hot-swap controllers limit the inrush current from damaging the board or from shorting out the backplane. When the input voltage is above the undervoltage threshold and below the overvoltage threshold, a 5FA current source powered from the internal 5V charge pump drives the gate of an external n-channel MOSFET, providing a slow turn-on response. An internal current-sense amplifier in the IC monitors the current across an external shunt resistor, providing current sensing for wide input-sense voltage range. The devices provide two levels of overcurrent circuit-breaker protections: a fast-trip threshold for a fast turn-off and a lower slow-trip threshold for a delayed turn-off. Exceeding either of the overcurrent circuit-breaker thresholds forces the device into fault mode where the external n-channel MOSFET is disabled. The MAX5977 is available in two versions that provide a latched-off (MAX5977A) or autoretry (MAX5977B) output when the device is in fault mode. A calibration mode allows further calibration of the integrated transconductance amplifier for production testing of the final design. The devices are offered in a 20-pin, 4mm x 4mm, TQFN-EP package and are fully specified from -40NC to +85NC. Variable Speed/Bi Level is a trademark of Maxim Integrated Products, Inc. Features S 1% Accurate Current-Sense Amplifier Output S Hot-Swap Monitors Operation from 1V to 16V S Integrated Charge Pump Fully Enhances the External n-Channel FET (VGATE = VIN + 5V) S Variable Speed/Bi Level K Fault Protection Provides Electronic Circuit-Breaker Function S Output Latched Off After Fault Condition (MAX5977A) S Autoretry After Fault Condition (MAX5977B) S Power-Good Indicator S Calibration Mode S Small, 20-Pin, 4mm x 4mm TQFN-EP Package MAX5977A/MAX5977B Applications Servers Storage Systems Network Switches and...