LT6109AHMS-2#PBF

Overview

The LT6109AHMS-2#PBF is a high-side current sense amplifier with integrated reference and comparators, manufactured by Analog Devices Inc. It operates within a supply voltage range of 2.7V to 60V and draws a typical supply current of 550µA. The device features a 1MHz bandwidth, 125dB common-mode rejection ratio, and a maximum input offset voltage of 125µV. It includes two comparators with opposing polarity options (LT6109-1) or same polarity (LT6109-2), offering fast response times and latching capabilities for fault detection.

Feature Summary

• Integrates a precision current sense amplifier with an internal 400mV reference and two open-drain comparators.
• Provides high threshold accuracy with total threshold error of ±1.25% maximum and fast propagation delay.
• Features low shutdown current and wide supply range suitable for industrial and automotive environments.
• Includes latchable comparator outputs for capturing high-speed overcurrent and undercurrent events.

Applications

• Overcurrent, undercurrent, and fault detection in power systems
• Current shunt measurement for battery monitoring
• Motor control applications requiring fast step response
• Automotive monitoring and control circuits
• Remote sensing and industrial control systems

Procurement Notes

Verify the specific suffix 'HMS' indicates the extended temperature grade (-40°C to 125°C) and MSOP package. Confirm the '#PBF' designation ensures lead-free compliance. Check official distributor listings for current availability as stock levels fluctuate. Ensure the ordering code matches the required comparator polarity configuration (LT6109-2 variant).

Selection Notes

Select this component when high-side current sensing with integrated fault protection is required. The LT6109-2 variant offers comparators with the same polarity, suitable for unified warning and disconnect thresholds. Consider the 125µV max offset for high-precision low-current measurements. Evaluate external resistor values for gain setting against the 1mA output current limit.

Part Context

This part belongs to the LT6109 family of high-side current sense amplifiers. It shares architectural similarities with the LT6109-1 but differs in comparator polarity configuration. The device is designed to replace discrete solutions by integrating amplification, referencing, and comparison functions into a single 10-lead MSOP package.

Replacement Considerations

Direct substitutes include other LT6109 variants such as LT6109AIMS-2#PBF for lower temperature grades or LT6109IMS-2#PBF for standard grades. Verify pin compatibility and electrical specifications before substitution.

FAQ

What is the difference between LT6109-1 and LT6109-2?

The LT6109-1 has comparators connected in opposing polarity, while the LT6109-2 has comparators connected in the same polarity.

How is the comparator threshold configured?

The comparator trip points are configured by external resistors connected to the INC1 and INC2 pins, utilizing the internal 400mV reference.