The LTC4214-2IMS negative voltage Hot Swap™ controller allows a board to be safely inserted and removed from a live backplane. Output current is controlled by three stages of current limiting: a timed circuit breaker, active current limiting and a fast feedforward path that limits peak current under worst-case catastrophic fault conditions.
Adjustable undervoltage and overvoltage detectors disconnect the load whenever the input supply exceeds the desired operating range. The LTC4214-2IMS controls negative supplies ranging from near zero to –16V. A multifunction timer delays initial start-up and controls the circuit breaker’s response time. This response time is accelerated by sensing excessive MOSFET drain voltage, keeping the MOSFET within its safe operating area (SOA). An adjustable soft-start circuit controls MOSFET inrush current at start-up. A power good status output can enable a power module at start-up or disable it if the circuit breaker trips.
The LTC4214-1 latches off after a circuit breaker fault times out. The LTC4214-2 provides automatic retry after a fault. The LTC4214-2IMS is available in the 10-pin MSOP package.
Feature
- Allows Safe Board Insertion and Removal from a Live Backplane
- Controls Supplies from 0V to –16V
- Adjustable Analog Current Limit With Circuit Breaker Timer
- Fast Response Time Limits Peak Fault Current
- Adjustable Soft-Start Current Limit
- Adjustable Timer with Drain Voltage Accelerated Response
- Adjustable Undervoltage/Overvoltage Protection
- LTC4214-1: Latch Off After Fault
- LTC4214-2: Automatic Retry After Fault
- Available in the 10-Pin MSOP Package
Applications
- Hot Board Insertion
- Electronic Circuit Breaker
- Negative Power Supply Control
- Central Office Switching
- High Availability Servers
- Disk Arrays
- Optical Networking/Switching
- ECL
(Picture: Pinout)
