The MAX15068 offers ORing function and hot-swap
features for two input-supply-rail applications requiring the
safe insertion and removal of circuit line cards from a live
backplane. The device integrates dual ORing MOSFET
controllers, a single hot-swap controller, electronic circuitbreaker
protection, and power monitoring in a single
package. The device operates on 2.9V to 18V supply
voltages.
The device regulates the forward voltage drop across the
ORing MOSFETs to ensure smooth current transfer from
one supply to the other without oscillation. The ORing
MOSFET turns on quickly to reduce the load voltage
drop during supply switchover. If the input supply fails
or is shorted, a fast turn-off minimizes reverse-current
transients.
The device implements a foldback current limit during hotswap
startup in order to control inrush current, thereby
keeping the hot-swap MOSFET under safe operating area
(SOA). After the hot-swap startup cycle is completed, onchip
comparators provide active current-limit protection
against short-circuit and overcurrent faults. The load is
disconnected from the input quickly in the event of a fault
condition.
The device provides a current-sense amplifier output. A
voltage proportional to the current delivered to the system
can be read directly at the IPMON pin.
The device is factory-calibrated to deliver accurate overcurrent protection with ±5% accuracy. During an overcurrent-fault condition, the device enters an autoretry mode. The device features an adjustable slew-rate control during startup. Additional features include power-good and fault-indicator outputs.
The MAX15068 is available in a 20-pin, (4mm x 5mm) TQFN package and is specified from a -40°C to +125°C operating temperature range.
Applications
- Baseband Station
- Computer Systems and Servers
- Redundant Power Supplies
- Storage Bridge Bay
- Supply Holdup
- Telecom Networks
