Features

• Small Footprint
• 33mΩ MOSFET with RSENSE
• Wide Operating Voltage Range: 2.9V to 26.5V
• Adjustable, 5% Accurate Current Limit
• Current and Temperature Monitor Outputs
• Overtemperature Protection
• Adjustable Current Limit Timer Before Fault
• Power Good and Fault Outputs
• Adjustable Inrush Current Control
• 2% Accurate Undervoltage and Overvoltage Protection
• Pin Compatible with LTC4232 (DFN Package Only)
• Available in 20-Lead TSSOP and 16-Lead 5mm × 3mm DFN Packages

Typical Application

Description

The LTC®4217 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. A dedicated 12V version (LTC4217-12) contains preset 12V specific thresholds, while the standard LTC4217 allows adjustable thresholds.

The LTC4217 provides separate inrush current control and a 5% accurate 2A current limit with foldback current 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 power good monitoring are also provided. For a 5A pin compatible version, see LTC4232.