The LTC®4231 is a micropower Hot Swap™ controller that allows safe circuit board insertion and removal from a live power supply. An internal high-side switch driver controls the gate of an external N-channel MOSFET. Back-to-back MOSFETs can be used for reverse supply protection down to –40 V. The LTC4231CMS-1PBF provides a debounce delay and allows the GATE to be ramped up at an adjustable rate. After startup, the LTC4231's quiescent current drops to 4 μA during normal operation with output active. UVL, UVH, OV and GNDSW monitor overvoltage and undervoltage periodically, keeping total quiescent current low. Pulling SHDN low shuts down the LTC4231CMS-1PBF and quiescent current drops to 0.3 μA. During an overcurrent fault, the LTC4231CMS-1PBF actively limits current while running an adjustable timer. The LTC4231-1 remains off after a current fault while the LTC4231-2 automatically reapplies power after a cool-down period. View Full-Size Diagram
Feature
- Enables Safe Board Insertion and Removal from a Power Supply
- 4µA Supply Current
- 0.3µA Shutdown Current
- Wide Operating Voltage Range: 2.7V to 36V
- Reverse Supply Protection to –40V
- Adjustable Analog Current Limit with Circuit Breaker
- Automatic Retry or Latchoff on Current Fault
- Overvoltage and Undervoltage Monitoring
- Controls Single or Back-to-Back N-Channel MOSFETs
- 12-Lead MSOP and 3mm × 3mm QFN Packages
- AEC-Q100 Qualified for Automotive Applications
Applications
- Battery Powered Equipment
- Solar Powered Systems
- Portable Instruments
- Automotive Battery Protection
- Energy Harvesting
