Features

• Allows Safe Board Insertion into a Live Backplane
• Small Footprint
• 33mΩ MOSFET with R_SENSE
• Wide Operating Voltage Range: 2.9V to 15V
• Adjustable, 10% 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 LTC4217 (DFN Package Only)
• Available in 16-Lead 5mm × 3mm DFN Package

Typical Application

Description

The LTC®4232 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.

The LTC4232 provides separate inrush current control and a 10% accurate 5A 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 2A pin compatible version, see LTC4217.

The LTC4232-1 (separate data sheet) allows faster turn-on than the LTC4232 by providing 16ms debounce delay and external control of the GATE ramp rate.