LT4363MPMS-2#TRPBF

Overview

The LT4363MPMS-2#TRPBF is a high voltage surge stopper with current limit, designed for automotive and industrial applications. It operates within a supply voltage range of 4 VDC to 80 VDC and withstands transients up to 250V. The device features an MSOP-12 package (4mm x 3mm) and supports a maximum operating temperature of +125°C. It includes automatic retry functionality after fault conditions and utilizes an external N-channel MOSFET for load protection.

Feature Summary

• Regulates output during overvoltage events by controlling the gate of an external N-channel MOSFET
• Provides fast overcurrent limiting to protect loads from sustained faults
• Features automatic restart capability following cool-down periods after fault detection
• Monitors input supply voltage to prevent turn-on below undervoltage thresholds

Applications

• Automotive load dump protection
• Avionics power system surge suppression
• Industrial hot-swap and live insertion systems
• High-side switching for battery-powered equipment

Procurement Notes

Verify component authenticity through authorized Analog Devices distributors or certified partners. Confirm the specific suffix matches the required tape-and-reel packaging configuration. Ensure the part number corresponds to the military-grade variant suitable for extended temperature ranges. Request full traceability documentation and material compliance certificates prior to finalizing acquisition orders.

Selection Notes

Select this component when designing circuits requiring robust protection against high-voltage transients exceeding standard regulator limits. The automatic retry feature distinguishes it from latch-off variants, making it suitable for systems needing continuous operation after transient faults. Ensure the external MOSFET selection aligns with the device's current limiting capabilities and thermal requirements.

Part Context

This part belongs to the LT4363 series of high-voltage surge stoppers manufactured by Analog Devices. It is specifically engineered to replace traditional Schottky diodes in reverse polarity protection schemes, offering lower voltage drop and reduced power loss. The series supports various packages including DFN, SOP, and MSOP formats for diverse board space constraints.

Replacement Considerations

LT4363MPMS-1#PBF

FAQ

How does the LT4363MPMS-2 handle persistent overvoltage conditions?

The device monitors the voltage drop across the current sense resistor. If an overcurrent or overvoltage condition persists beyond the timer delay, the internal amplifier turns off the external MOSFET. Unlike the -1 variant, the -2 version automatically retries after a cool-down period.

What is the function of the SHDN pin in this circuit?

The shutdown pin reduces the quiescent current to less than 7µA during inactive states. Pulling this pin low disables the internal circuitry, allowing for efficient power management in standby modes.