General Description

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 circuit-

breaker protection, and power monitoring in a single

package. The device is designed to operate from 3.7V 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 droop

during supply switchover. If the input supply fails or is short-

ed, a fast turn-off minimizes reverse-current transients.

The device implements a foldback current limit during hot-

swap startup in order to control inrush current, thereby

lowering di/dt and keeping the operation of the hot-swap

MOSFET under safe operating area (SOA). An internal

70ms timer starts counting when the device enters the

hot-swap startup phase. After the hot-swap startup cycle

is completed, on-chip 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 current monitoring from 3A to 10A

accuracy. A voltage proportional to the input current

delivered to the system could 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.

Features and Benefits

● 3.7V to 18V Operating Voltage Range (ORing and

Hot Swap)

● 4.8V to 18V Operating Voltage Range (Current

Monitor)

● Seamless Power Transition of Redundant Supplies

● Controls N-Channel MOSFETs

● < 0.5µs Turn-On and Reverse Turn-Off Time

● Current Monitoring (±0.6% Accuracy Typ)

● Programmable Slew-Rate Control

● Adjustable Current-Limit Fault Delay

● Programmable Circuit-Breaker Current Threshold

● Inrush Current Regulated at Startup with

Programmable SOA Control

● Programmable Undervoltage Lockout

● Small (4mm x 5mm) TQFN Package

Applications

● Baseband Station

● Redundant Power Supplies

● Supply Holdup

● Computer Systems and Servers

● Telecom Networks

● Storage Bridge Bay

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part, refer

to

MAX15068

Dual ORing, Single Hot-Swap Controller with

Accurate Current Monitoring

19-6872; Rev 0; 12/13

EVALUATION KIT AVAILABLE