LT6109HMS-1#TRPBF

Overview

The LT6109HMS-1#TRPBF 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 475µA at 2.7V. The device features a 1MHz bandwidth, 125dB common-mode rejection ratio, and a maximum input offset voltage of 350µV. It includes two comparators with opposing polarity, an internal 400mV precision reference, and open-drain outputs. The component is specified for operation from –40°C to 125°C and is housed in a 10-lead MSOP package.

Feature Summary

• Integrates a precision current sense amplifier with an internal 400mV reference and two comparators configured in opposing polarity.
• Provides fast response capabilities with a 1MHz bandwidth and total propagation delay typically around 1.4µs.
• Features open-drain comparator outputs allowing easy interface to system components and latch functionality for capturing high-speed events.

Applications

• Overcurrent, undercurrent, and fault detection
• Current shunt measurement
• Motor control error detection
• Battery monitoring
• Industrial and automotive monitoring

Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging when sourcing. Confirm the HMS designation corresponds to the industrial temperature grade ranging from –40°C to 125°C. Ensure compatibility with the 10-lead MSOP footprint during PCB design. Cross-reference the manufacturer's ordering information to validate lead-free finish specifications.

Selection Notes

Select this variant for applications requiring opposing polarity comparator outputs for distinct overcurrent and undercurrent flagging. The high common-mode rejection ratio suits noisy environments with wide supply voltage variations. Consider the 125µV to 350µV offset voltage limits when designing for low-current precision measurements. Verify that the 1mA output current capability meets the drive requirements of the downstream circuitry or ADC inputs.

Part Context

This component belongs to the LT6109 family of high-side current sense amplifiers. The LT6109-1 version specifically configures the internal comparators with opposing polarities, distinguishing it from the LT6109-2 which shares the same polarity. The H-grade ensures extended temperature performance suitable for demanding industrial and automotive sectors compared to the standard I-grade.

Replacement Considerations

LT6109HMS-1#PBF (Tube Packaging)

FAQ

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

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

How is the gain of the current sense amplifier set?

The gain is configured by external resistors, specifically RIN and ROUT, where the voltage gain is determined by the ratio of these resistors.