GENERAL DESCRIPTION

The LTC4287 is an integrated solution for hot swap applications

that allows a board to be safely inserted and removed from a live

backplane. The dual-gate drivers coupled with configurable multimode

startup sequencing and operation optimize the metal-oxide

semiconductor field-effect transistor (MOSFET) safe operating area

(SOA) for a variety of power levels. The circuit breaker timer limits

the MOSFET temperature for reliable protection against overstress.

The SMBus 3.1 interface, PMBus command structure, and onboard

analog-to-digital converters (ADCs) with selectable resolution

and speed allow monitoring of board current, voltage, power, energy,

temperature, and fault status. An optional external, electrically

erasable programmable read only memory (EEPROM) can be used

for part configuration and provide BlackBox capturing of past fault

conditions.

The LTC4287 has additional features to respond to input undervoltages

and overvoltages, to interrupt the host when a fault has occurred,

to notify when the output power is good, to detect insertion

of a board, to turn off the MOSFET if an external supply monitor

fails to indicate power-good within a timeout period, and to auto

reboot after a programmable delay following a host commanded turn-off.

FEATURES

► Drives two gates for high power applications

► Wide input supply voltage range: 6.5 V to 80 V

► Optimizes MOSFET SOA with multimode start-up sequencing

and operation

► Monitors currents, voltages, power, and energy with the ADC

► Limits MOSFET temperature for overstress protection

► Adjustable, 6.6% accurate (5 mV) current limit with foldback

► BlackBox capturing and configuration using an optional external

EEPROM

► SMBus 3.1 interface and PMBus-compliant command structure

► Parallelable controllers for high current levels

► Minimum and maximum ADC measurements logging with alerts

► Available in 48(39)-lead plastic QFN (7 mm × 7 mm) package

► Configurable current foldback

APPLICATIONS

► High availability server backplane systems

► 12 V/24 V/48 V/54 V distributed power systems

► Industrial