LTC4380IMS-3#TRPBF

Overview

The LTC4380IMS-3#TRPBF is a low quiescent current surge stopper manufactured by Analog Devices Inc. It protects loads from high voltage transients by clamping the gate voltage of an external N-channel MOSFET, limiting output voltage during overvoltage events such as automotive load dump. The device features a fixed internal gate clamp voltage selectable for 12V systems and operates within a wide input voltage range of 4 V to 72 VDC. It provides overcurrent protection via an internal multiplier that limits operating time based on MOSFET stress. The component utilizes an MSOP-10 surface-mount package and maintains a low operating current of 8 µA, enabling use in always-on and battery-powered applications.

Feature Summary

• Clamps external N-channel MOSFET gate voltage to limit output during overvoltage events
• Provides overcurrent protection with adjustable fault timer based on MOSFET stress
• Drives back-to-back MOSFETs for reverse input protection without Schottky diode drop
• Monitors input supply for undervoltage conditions using accurate ON pin comparator

Applications

• Automotive load dump protection
• Avionics power system protection
• Industrial equipment surge suppression
• Battery powered system high-side switching

Procurement Notes

Verify the specific suffix designation against official Analog Devices documentation to confirm the fixed gate clamp voltage configuration. Ensure the ordering part number matches the required system voltage architecture. Confirm RoHS compliance status through manufacturer datasheets or environmental files prior to procurement. Validate package type and thermal characteristics for the target application environment.

Selection Notes

Select this component when a fixed 31.5 V gate clamp voltage is appropriate for 12V system architectures requiring robust transient protection. Consider the low quiescent current requirement for battery-operated designs where standby power consumption is critical. Evaluate the need for latch-off versus restart options based on system recovery requirements after fault conditions. Ensure the external MOSFET selection aligns with the device's stress limitation capabilities.

Part Context

The LTC4380 series comprises low quiescent current surge stoppers designed for high-reliability applications. This specific variant belongs to the family offering fixed internal clamp voltages tailored for standard automotive and industrial bus architectures. It serves as a specialized circuit protection solution distinct from general-purpose voltage regulators or interface transceivers found in other Analog Devices product lines.

Replacement Considerations

LTC4380HDD-3#TRPBF

FAQ

How does the device handle reverse input protection?

The GATE pin can drive back-to-back MOSFETs to provide reverse input protection, eliminating the voltage drop and power dissipation associated with Schottky diode solutions.

What determines the operating time during fault conditions?

An internal multiplier generates a TMR pin current proportional to VDS and ID, limiting operating time in both overcurrent and overvoltage conditions according to MOSFET stress.