No internal switch — external FET sets the current limit
The MAX5902AAEUT: The controller has no internal switch (cites:No), so the designer selects an external N-channel MOSFET sized for the load current and the thermal budget of the application. The controller then drives the gate to regulate the slew rate and current limit. Programmable features include auto retry, circuit breaker threshold, current limit, fault timeout, output slew rate, thermal limit, and undervoltage lockout (UVLO) — all set with external resistors and capacitors, giving the board designer control over the protection profile without a microcontroller.
SOT-23-6 footprint and operating temperature range
Housed in a 6-lead SOT-23 package (cites:SOT-23-6, cites:SOT-23-6), the controller occupies minimal board area — useful when the hot-swap function must fit on a dense line card alongside the main power stage.
RoHS non-compliant — sourcing constraint for lead-free lines
The MAX5902AAEUT is marked RoHS non-compliant (cites:RoHS non-compliant). This means it contains lead (Pb) above the RoHS exemption thresholds and cannot be used on a standard lead-free assembly line without a waiver or a dedicated tin-lead process. For BOMs that require RoHS compliance, the designer should check for a lead-free variant in the Simple Swapper family or plan for an exemption. The part draws 1 mA supply current (cites:1 mA), so the quiescent loss is negligible in most power budgets.