LTC4236IUFD-2

This is a dual-channel ideal diode OR-ing plus single hot-swap control chip developed by Analog Devices, used for redundant power supply seamless switching and live plug-in protection of circuit boards, replacing traditional high-power Schottky diodes to lower power loss and optimize power system reliability.

LTC4236 stands for core model of dual ideal diode and hot swap controller series. I means industrial temperature grade working specification. UFD corresponds to 28-pin QFN exposed pad packaging. The suffix digit 2 defines automatic retry recovery mode after overcurrent fault triggering.

Input working voltage range covers 2.9V to 18V, compatible with common 5V, 12V industrial bus power rails. It drives external N-channel MOSFETs to realize two-way power source OR-ing switching, the forward voltage drop is stably controlled at only 15mV, greatly reducing conduction heat compared with diodes.

The chip integrates hot-swap inrush current limiting function, enabling circuit boards to be safely plugged and unplugged on powered backplanes without generating large surge current to damage power sources and backplane equipment. It adopts foldback current limiting mechanism, responds to short-circuit faults within 1 microsecond to clamp peak current, and supports adjustable startup time and fault delay time through peripheral resistors.

Ideal diode turn-on and turn-off speed reaches 0.5 microseconds, power switching process is smooth without oscillation and reverse current backflow. Built-in load current monitoring output pin, which can cooperate with ADC to collect real-time load power consumption data. Complete status pins including power good signal, fault alarm and diode working state are led out for system logic judgment. The -2 version will automatically restart intermittently after fault shutdown instead of permanent latch-off.

Adopts 28-pin QFN surface mount package with exposed thermal pad, overall dimension 4mm×5mm, chip thickness 0.75mm. The bottom metal pad effectively conducts heat to restrain temperature rise during continuous heavy-load operation. It is categorized as MSL3 moisture sensitive component, reflow soldering work needs to be finished within 168 hours after original vacuum packaging opening. Tape-and-reel and tube bulk packaging are both available to match automated SMT placement production lines.

Industrial grade operating temperature range is -40℃ ~ +85℃, suitable for equipment working in environments with drastic temperature fluctuations. The product is produced via lead-free manufacturing process and complies with universal environmental protection material restriction standards. Highly integrated functional design simplifies redundant power supply peripheral circuit layout and reduces overall BOM cost.

Communication server, network switch mainboard redundant dual power supply backup circuit

Industrial control backplane, embedded computing board live plug-in hot swap protection module

Medical testing equipment power input anti-surge and dual power seamless switching unit

Vehicle-mounted auxiliary control equipment, monitoring gateway power supply management circuit

Storage equipment hard disk backplane power protection and multi-source power switching system

LXB Semicon supplies original Analog Devices LTC4236IUFD-2 hot swap & ideal diode power management IC