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Dual ORing, Single Hot-Swap Controller with Accurate Current Monitoring

Board Saving, 0.6% Current-Sense Accuracy, Single Chip for Both ORing and Hot-Swap SOA Control

Product Details

Key Features

Applications/Uses

Parametric specs for Hot Swap Controllers
VIN (V) (min) 3.7
VIN (V) (max) 18
Circuit Breaker/ Current Limit Circuit Breaker
Circuit Breaker/Current Limit Threshold (mV) Adjustable
Fault Condition Control Periodic Retry
Features Adjustable Current Limit Fault Delay
Analog Current Report Output
Programmable Soft start
Programmable UVLO/Inrush Current Regulated at Startup with SOA Control
VariableSpeed/BiLevel Current Limit
Package/Pins TQFN-CU/20
Budgetary
Price (See Notes)
2.71
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Simplified Block Diagram

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Parameters

Parametric specs for Hot Swap Controllers
VIN (V) (min) 3.7
VIN (V) (max) 18
Circuit Breaker/ Current Limit Circuit Breaker
Circuit Breaker/Current Limit Threshold (mV) Adjustable
Fault Condition Control Periodic Retry
Features Adjustable Current Limit Fault Delay
Analog Current Report Output
Programmable Soft start
Programmable UVLO/Inrush Current Regulated at Startup with SOA Control
VariableSpeed/BiLevel Current Limit
Package/Pins TQFN-CU/20
Budgetary
Price (See Notes)
2.71

Key Features

  • 2.9V to 18V Operating Voltage Range (ORing and Hot Swap)
  • Seamless Power Transition of Redundant Supplies
  • Controls n-Channel MOSFETs
  • < 0.5µs Reverse Turn-Off Time
  • Precision Current Monitoring
  • Adjustable Slew-Rate Control
  • Adjustable Current-Limit Fault Delay
  • Adjustable Circuit-Breaker Current Threshold
  • Inrush Current Regulated at Startup
  • Adjustable Undervoltage Lockout
  • Small (4mm x 5mm) TQFN Package

Applications/Uses

  • Baseband Station
  • Computer Systems and Servers
  • Redundant Power Supplies
  • Storage Bridge Bay
  • Supply Holdup
  • Telecom Networks

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 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.

Simplified Block Diagram

MAX15068: Functional Diagram MAX15068: Functional Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .