The LTC4224 is a dual Hot Swap controller in a 3mm × 2mm DFN package that is perfect for backplane or card resident 1V–6V applications.
The document introduces the LTC4224 as a device combining two independent Hot Swap controllers in a 3mm x 2mm DFN package. It is intended for high availability electronics where components are added or removed without downtime, preventing PCB damage and data loss.
Key operational features include active current limiting (ACL) to regulate voltage drops across sense resistors at approximately 25mV, and an electronic circuit breaker (ECB) that latches off the MOSFET after a prolonged overload. The device supports applications ranging from telecom systems to optical transceivers like XENPAK/X2 modules.
The LTC4224 is a dual hot swap controller designed for backplane or card resident applications operating between 1V and 6V.
The device uses an internal 10ms debounce delay that restarts every time the ON pin transitions high to ignore spurious signals during connector mating.
The electronic circuit breaker latches off the MOSFET and pulls the FAULT pin low after detecting an active current limit for more than 5ms.