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This IC targets dual voltage hot swap applications across the +2.5V to +3.3V (nominal) bias supply voltage range with a second lower voltage rail down to less than 1V. It features a charge pump for driving external N-Channel MOSFETs, regulated current protection and duration, output undervoltage monitoring and reporting, optional latch-off or retry response, and adjustable soft-start.

The current regulation level (CR) for each rail is set by two external resistors and each CR duration is set by an external capacitor on the TIM pin. After the CR duration has expired the IC then quickly pulls down the associated GATE(s) output turning off its external FET(s). The ISL6173 offers a latched output or indefinite auto retry mode of operation.

Key Features

• Fast Current Regulation amplifier quickly responds to overcurrent fault conditions
• Less than 1µs response Time to Dead Short
• Programmable Current Regulation Level and Duration
• Two Levels of Overcurrent Detection Provide Fast Response to Varying Fault Conditions
• Overcurrent Circuit Breaker and Fault Isolation functions
• Adjustable Current Regulation Threshold as low as 20mV
• Selectable Latch-off or Auto Retry Response to Fault conditions
• Adjustable voltage ramp-up for In-rush Protection During Turn-On
• Rail Independent Control, Monitoring and Reporting I/O
• Dual Supply Hot Swap Power Distribution Control to <1V
• Charge Pump Allows the use of N-Channel MOSFETs
• QFN Package:
  • Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Package Outline
  • Near Chip Scale Package footprint, which improves PCB efficiency and has a thinner profile
• Pb-Free Plus Anneal Available (RoHS Compliant)

Applications

• Power Supply Sequencing, Distribution and Control
• Hot Swap/Electronic Breaker Circuits