LT6109HMS-1#PBF

Overview

The LT6109HMS-1#PBF is a high-side current sense amplifier featuring an integrated precision voltage reference and two comparators with opposing polarity. It operates within a supply voltage range of 2.7V to 60V and draws a typical supply current of 475µA at 2.7V, increasing to 1000µA at 60V. The device offers a signal bandwidth of 1MHz and a maximum input offset voltage of 350µV for the standard grade. Comparator threshold accuracy is specified with a total error of ±1.25% maximum, utilizing a 400mV internal reference. The component is housed in a 10-lead MSOP package and is rated for operation from –40°C to 125°C.

Feature Summary

• Integrates a precision current sense amplifier with an internal 400mV voltage reference and two open-drain comparators configured in opposing polarity.
• Provides fast response capabilities with a 1MHz bandwidth and typical propagation delay of 1.4µs for overcurrent and undercurrent detection.
• Features latching comparator outputs that capture high-speed events and can be reset via the EN/RST pin.
• Supports wide supply voltage operation from 2.7V to 60V with low shutdown current.

Applications

• Circuit fault protection with latching load disconnect
• Current shunt measurement
• Motor control error detection
• Battery monitoring systems

Procurement Notes

Verify the specific suffix 'HMS-1' corresponds to the industrial temperature grade (-40°C to 125°C) and the -1 variant with opposing comparator polarities. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor datasheets prior to procurement. Ensure the ordering part number matches the required lead-free finish and tape/reel specifications if applicable.

Selection Notes

Select this component when high-side sensing with integrated fault detection is required. The -1 variant is suitable for applications needing distinct overcurrent and undercurrent flags due to opposing comparator polarities. Consider the 350µV maximum offset voltage for low-current resolution requirements. Ensure external gain resistors are selected to maintain output current within the 1mA limit while achieving desired voltage swing.

Part Context

This part belongs to the LT6109 family of high-side current sense amplifiers. The LT6109-1 variant specifically features comparators connected in opposing polarity, distinguishing it from the LT6109-2 which has same-polarity comparators. The 'H' designation indicates the extended temperature range version, while 'MS' denotes the 10-lead MSOP package.

Replacement Considerations

LT6109HMS-2#PBF (Same polarity comparators)

FAQ

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

The LT6109-1 has comparators connected in opposing polarity, providing separate overcurrent and undercurrent flags. The LT6109-2 has comparators connected in the same polarity.

How is the comparator latch reset?

The comparators can be reset by pulsing the EN/RST pin low for a duration between 2µs and 15µs.