LT6108HMS8-1#PBF

Overview

The LT6108HMS8-1#PBF is a high-side current sense amplifier featuring an integrated precision voltage reference and a latching comparator. It operates within a supply voltage range of 2.7V to 60V with a typical supply current of 450µA. The device incorporates a current sense amplifier with a maximum input offset voltage of 125µV and a signal bandwidth of 1MHz. The internal comparator provides a rising threshold of approximately 400mV with a total threshold error of ±1.25%. It is housed in an 8-lead MSOP package and specified for operation from –40°C to 125°C.

Feature Summary

• Integrates a precision current sense amplifier, a 400mV internal voltage reference, and a latching comparator in a single device.
• Features a fast response time with a typical propagation delay of 1.4µs and a step response of 500ns for rapid overcurrent detection.
• Provides direct access to amplifier and comparator inputs/outputs, allowing external configuration of gain and trip points via resistors.
• Supports wide supply ranges up to 60V with low shutdown current and open-drain comparator output for easy system interfacing.

Applications

• Circuit fault protection with very fast latching load disconnect
• Motor control systems requiring error detection
• Automotive monitoring and control applications
• Industrial control and remote sensing

Procurement Notes

Verify the specific suffix 'H' indicates the extended temperature grade (-40°C to 125°C) compared to the standard 'I' grade. Confirm the '-1' designation corresponds to the latching comparator version, distinct from the non-latching '-2' variant. Ensure the MSOP-8 package matches the required footprint. Cross-reference the datasheet revision to confirm pinout consistency for EN/RST functionality.

Selection Notes

Select this component when high-side sensing with integrated fault latching is required. The 1MHz bandwidth supports motor control applications needing fast error detection. The latching comparator simplifies system recovery logic by maintaining the fault state until explicitly reset. Consider the 125µV max offset for precision requirements and the 60V common mode range for industrial power supplies.

Part Context

This part belongs to the LT6108 family of high-side current sense amplifiers. The LT6108-1 variant specifically includes a latching comparator, whereas the LT6108-2 offers a non-latching option. Both share the same amplifier architecture but differ in comparator behavior. The H-grade ensures performance across the full automotive and industrial temperature range.

Replacement Considerations

LT6108HMS8-2#PBF (Non-latching comparator version)

FAQ

What is the function of the EN/RST pin on the LT6108-1?

The EN/RST pin serves as both the enable input and the latch reset. Pulling it low for 2µs to 15µs resets the latching comparator, while holding it low for longer than 40µs enters shutdown mode.

How is the comparator threshold configured?

The comparator uses an internal 400mV precision reference as its threshold. The trip point can be adjusted using external resistors connected to the INC pin and the amplifier output.