Dual-channel hot swap control for low-voltage rails
The LTC4224IMS-1#PBF is a 2-channel Hot Swap Controller from Analog Devices, designed to manage inrush current and protect supply rails from 1V up to 6V. It operates without an internal switch, relying on external N-channel MOSFETs to pass the load current, which gives the designer control over the FET selection based on the actual load profile and thermal budget. The controller integrates programmable current limiting and slew-rate control, so the turn-on ramp of each channel can be tuned to prevent upstream supply droop while meeting the downstream load's start-up current demand.
Supply range and channel management
Each of the two independent channels has its own enable, fault output, and timing, allowing per-rail sequencing or independent hot-swap control on a shared backplane. The controller draws 1.4 mA from the supply rail during operation, a figure that stays nearly constant across the input range and load conditions, simplifying the upstream power budget.
Package and board-fit for the 10-MSOP
Housed in a 10-MSOP package (3.00 mm x 3.00 mm body, 0.118" width), the LTC4224IMS-1#PBF fits a compact footprint with a 0.50 mm lead pitch — standard for low-pin-count analog controllers. Supplied in tube packaging, the part is suited for prototype builds and low-to-medium volume production without the reel fee for tape-and-reel.
Temperature grade and fault handling
Built-in fault features include an undervoltage lockout (UVLO) threshold that holds the outputs off until the supply rail rises above the programmed start voltage, plus a fault timeout and latched fault response that shuts down the channel on persistent overcurrent — no auto-retry, so the fault condition is held until the enable is cycled or power is removed. The latched fault behaviour is deliberate: it prevents the MOSFET from cycling in and out of thermal limit during a hard short, protecting both the external FET and the board traces.
Lifecycle and compliance posture
The LTC4224IMS-1#PBF is ROHS3 compliant, meeting the EU directive for lead-free and restricted-substance manufacturing.