MAX15068 Datasheet, PDF (1/17 Pages) Maxim Integrated Products – Dual ORing, Single Hot-Swap Controller

MAX15068
EVALUATION KIT AVAILABLE
Dual ORing, Single Hot-Swap Controller with
Accurate Current Monitoring
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
(V_IN = 12V, T_A = +25°C with R_SENSE = 3mΩ) with ±0.6%
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 www.maximintegrated.com/MAX15068.related.
19-6872; Rev 0; 12/13