Hot Swap Controller in 6-Lead SOT-23 Package

The LTC4210-3/LTC4210-4 is a 6-pin SOT-23 Hot Swap controller that allows a board to be safely inserted and removed from a live backplane. An internal high side switch driver controls the GATE of an external N-channel MOSFET for a supply voltage ranging from 2.7V to 7V. The LTC4210 provides the initial timing cycle and allows the GATE to be ramped up at an adjustable rate.

The LTC4210 features a fast current limit loop providing active current limiting together with a circuit breaker timer. The signal at the ON pin turns the part on and off and is also used for the reset function.

The LTC4210-3 retries on overcurrent fault and the LTC4210-4 latches off on an overcurrent fault.

Vin Range

Retry / Latchoff

LTC4210-1

2.7V to 16.5V

Retry After Fault

LTC4210-2

2.7V to 16.5V

Latch Off After Fault

LTC4210-3

2.7V to 7V

Retry After Fault

LTC4210-4

2.7V to 7V

Latch Off After Fault

Applications

* Hot Board Insertion

* Electronic Circuit Breaker

* Industrial High Side Switch/Circuit Breaker

* Allows Safe Board Insertion and Removal from a Live Backplane

* Adjustable Analog Current Limit with Circuit Breaker

* Fast Response Limits Peak Fault Current

* Automatic Retry or Latch Off On Current Fault

* Adjustable Supply Voltage Power-Up Rate

* High Side Drive for External MOSFET Switch

* Controls Supply Voltages from 2.7V to 7V

* Undervoltage Lockout

* Adjustable Overvoltage Protection

* Low Profile (1mm) SOT-23 (ThinSOT™) Package