Dual Low Voltage Circuit Breaker

Typical Diagram

Diagram Not Shown

Key Features

    • Fast Circuit Breaker Quickly Responds to Overcurrent Fault Conditions
    • Less than 1µs Response Time to Dead Short
    • Programmable Circuit Breaker Level and Delay
    • Two Levels of Overcurrent Detection Provide Fast Response to Varying Fault Conditions
    • Overcurrent Circuit Breaker and Fault Isolation Functions
    • Adjustable Circuit Breaker Threshold as Low as 20mV
    • 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 (RoHS Compliant)


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 where a circuit breaker response to an over current event is preferred. It features a charge pump for driving external N-Channel MOSFETs, accurate programmable circuit breaker current thresholds and delay output undervoltage monitoring and reporting and adjustable soft-start.

The circuit breaker current level (ICB) for each rail is set by two external resistors, and for each rail a delay (tCB) is set by an external capacitor on the TCB pin. After tCB has expired, the IC then quickly pulls down the associated GATE(s) output turning off its external FET(s).


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


Design Tip

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