LT6109AIMS-1#PBF

Overview

The LT6109AIMS-1#PBF is a high-side current sense amplifier with integrated reference and comparators, designed for industrial and automotive applications. It operates within a supply voltage range of 2.7V to 60V and features a maximum input offset voltage of 125µV. The device includes two comparators with opposing polarity, offering a total threshold error of ±1.25% and a typical propagation delay of 1.4µs. It provides a signal bandwidth of 1MHz and a fast step response of 500ns. The component draws a typical supply current of 475µA at 2.7V and reduces to 5µA maximum in shutdown mode. It is housed in a 10-lead MSOP package and specified for operation from –40°C to 85°C.

Feature Summary

• Integrates a precision current sense amplifier with an internal 400mV reference and two latching comparators configured in opposing polarity.
• Provides high accuracy with low offset voltage and gain error, ensuring reliable detection of overcurrent and undercurrent conditions.
• Features open-drain comparator outputs that allow easy interface to system components and level shifting to digital supplies.
• Supports wide supply voltage ranges and includes enable/reset functionality for power management.

Applications

• Overcurrent, undercurrent, and fault detection
• Current shunt measurement
• Battery monitoring
• Motor control
• Automotive monitoring and control

Procurement Notes

Verify the specific temperature grade and package variant when ordering, as the LT6109 series includes different grades (I and H) and comparator configurations (-1 and -2). Confirm that the A-grade version meets the required offset voltage specifications for your application. Ensure compatibility with the 10-lead MSOP footprint during PCB design. Check for lead-free finish compliance if required by your manufacturing standards.

Selection Notes

Select the LT6109AIMS-1#PBF for applications requiring precise current sensing with integrated fault protection. The 'A' grade ensures a tighter input offset voltage specification compared to standard grades. The '-1' suffix indicates comparators with opposing polarity, suitable for distinct warning and disconnect thresholds. Consider the 1MHz bandwidth and 500ns step response for high-speed motor control or critical error detection scenarios where rapid fault isolation is necessary.

Part Context

The LT6109 is part of Analog Devices' high-side current sense amplifier family, designed to simplify circuit design by integrating amplification, reference, and comparison functions. This specific model, LT6109AIMS-1#PBF, represents the industrial grade ('I') with enhanced accuracy ('A') and opposing comparator polarity ('-1'). It is commonly used in systems requiring robust monitoring of power rails and load currents without external discrete components for basic fault detection.

Replacement Considerations

LT6109IMS-1#PBF offers the same functionality but with standard offset voltage specifications. LT6109AHMS-1#PBF provides the same electrical performance as the A-grade but is specified for an extended temperature range up to 125°C. LT6109HMS-1#PBF is the high-temperature industrial grade version with standard accuracy. For dual-comparator same-polarity applications, consider the LT6109AIMS-2#PBF.