LTC4380IDD-4#PBF

Surge Suppression ICS Overview

The LTC4380IDD-4#PBF 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 during overvoltage events, such as automotive load dump. The device features a wide operating voltage range of 4 VDC to 72 VDC and a maximum supply current of 12 uA. It operates within a temperature range of -40°C to +85°C and is housed in a compact MSOP-10 package with dimensions of 3 mm x 3 mm x 0.86 mm.

Surge Suppression ICS Feature Summary

• Provides overvoltage protection by clamping the gate voltage of an external N-channel MOSFET to limit output voltage during transient events like load dump.
• Features an internal multiplier that generates a timer current proportional to VDS and ID, allowing adjustable fault timers for overcurrent and overvoltage conditions based on MOSFET stress.
• Supports reverse input protection up to -60 V by driving back-to-back MOSFETs, eliminating the voltage drop and power dissipation associated with Schottky diode solutions.

Surge Suppression ICS Applications

• Automotive systems requiring protection against load dump and high voltage transients
• Avionics equipment needing reliable surge suppression in harsh electrical environments
• Industrial applications utilizing battery-powered or always-on high-voltage switching circuits

Surge Suppression ICS Procurement Notes

Verify the specific suffix configuration when ordering, as it determines the fixed clamp voltage selection (e.g., 31.5V or 50V) versus adjustable options. Confirm the package type matches the design requirements, as the IDD suffix indicates an MSOP-10 footprint. Ensure compatibility with the external N-channel MOSFET selected for the application, as the device controls rather than contains the pass element. Check for any recent Product Change Notifications regarding manufacturing updates.

Surge Suppression ICS Selection Notes

Select this component when designing for systems operating between 4 V and 72 V that require minimal static current consumption. The IDD variant provides a fixed clamp voltage suitable for standard 12V or 24V/28V architectures, unlike the adjustable versions. Consider the MSOP-10 package size constraints and thermal performance relative to the expected surge energy levels. This part is appropriate where precise timing control via the TMR pin is necessary to protect downstream components from thermal stress.

Surge Suppression ICS Part Context

This component belongs to the LTC4380 family of low quiescent current surge stoppers designed for robust circuit protection. The series includes variants with different clamp voltages and packages, such as the DFN-10 and MSOP-10 options. These devices are engineered to replace traditional diode-based protection schemes, offering superior efficiency and customizable fault response times through external component integration.

Surge Suppression ICS Replacement Considerations

Direct replacements include other LTC4380 variants with compatible voltage ranges and package footprints, such as the LTC4380HDD or LTC4380IMS series, provided the clamp voltage specifications align with the system requirements. Verify that substitute parts maintain the same 12 uA maximum supply current and support the required operating temperature range.

Surge Suppression ICS FAQ

How does the LTC4380IDD-4#PBF handle reverse polarity connections?

The GATE pin can drive back-to-back MOSFETs to provide reverse input protection up to -60 V, effectively blocking reverse currents without the voltage drop typical of Schottky diodes.

What determines the duration of the overcurrent or overvoltage event before the device shuts down?

An internal multiplier generates a current at the TMR pin proportional to the product of VDS and ID. This current charges an external capacitor, creating a programmable fault timer that limits operation time according to MOSFET stress limits.