LTC4217 is an integrated solution for Hot Swap applications that allows a board to be safely inserted and removed from a live backplane. The part integrates a Hot Swap controller, power MOSFET and current sense resistor in a single package for small form factor applications. It provides separate inrush current control and an accurate 2A current limit with current fold-back limiting. The current limit threshold can be adjusted dynamically using an external pin. Additional features include a current monitor output that amplifies the sense resistor voltage for ground referenced current sensing and a MOSFET temperature monitor output. Thermal limit, overvoltage, undervoltage and powergood monitoring are also provided.
The LTC4217 is an integrated hot‑swap controller that combines a MOSFET, current limit, and monitoring functions in a small package. It supports a wide operating voltage range from 2.9 V to 26.5 V and offers adjustable in‑rush current control, over‑temperature protection, and power‑good monitoring.
The document provides absolute maximum ratings, detailed electrical characteristics, pin descriptions, typical performance curves, package dimensions, and example circuit applications. It also lists related hot‑swap controller parts for alternative designs.
| Input Supply Voltage Range | 2.9 V to 26.5 V |
|---|---|
| Switch On‑Resistance (Ron) | 15 mΩ to 50 mΩ |
| Current Limit Threshold | 1.28 V to 2.15 A |
The device operates from 2.9 V up to 26.5 V.
The MOSFET on‑resistance is specified between 15 mΩ and 50 mΩ.
The current limit threshold is set by the voltage on the ISE pin, typically 1.28 V to 2.15 A.