Data Sheet
LTC4287
High Power Positive Hot Swap Controller with Power Monitor
FEATURES
GENERAL DESCRIPTION
► 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
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 multi-
mode 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 on-
board analog-to-digital converters (ADCs) with selectable resolution
and speed allow monitoring of board current, voltage, power, ener-
gy, 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.
► 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
The LTC4287 has additional features to respond to input undervol-
tages and overvoltages, to interrupt the host when a fault has oc-
curred, 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.
APPLICATIONS
► High availability server backplane systems
► 12 V/24 V/48 V/54 V distributed power systems
► Industrial
TYPICAL APPLICATION
Figure 1. 54 V, 3900 W Hot-Swap Controller (Parallel Mode)
Rev. 0
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