LTC2946CMS#TRPBF

Overview

The LTC2946CMS#TRPBF is a single-channel rail-to-rail system monitor manufactured by Analog Devices Inc. It measures current, voltage, power, charge, and energy via an I2C interface. The device operates within a supply voltage range of 2.7 V to 100 V and includes an internal shunt regulator for handling supplies exceeding 100 V. Key electrical specifications include a common-mode voltage range of 2.7 V to 100 V, an input offset voltage of 77 uV, a maximum operating supply voltage of 100 V, and a minimum of 2.7 V. Quiescent current is 700 uA, with a gain error of 0.4%. It functions between -40°C and +125°C in a 16-pin MSOP package.

Feature Summary

• Rail-to-rail system monitoring capability for comprehensive measurement of current, voltage, power, charge, and energy.
• Integrated I2C interface supporting communication speeds up to 10 kHz.
• Internal shunt regulator designed to tolerate supply voltages above 100 V.

Applications

• Wide range negative power, charge, and energy monitoring
• Bidirectional power monitoring with forward path energy and charge tracking
• Power systems in harsh environments utilizing INTVCC shunt regulators

Procurement Notes

Verify the specific suffix #TRPBF confirms tape-and-reel packaging when sourcing. Confirm automotive qualification status if required for the target application. Ensure compatibility with the 16-pin MSOP footprint during PCB layout. Validate that the 10 kHz I2C speed meets system timing requirements. Check for any recent product change notifications regarding material or assembly updates.

Selection Notes

Select this component for applications requiring high-side or low-side current sensing with integrated energy accumulation. The wide common-mode voltage range supports various bus architectures. Consider the 700 uA quiescent current for battery-powered designs. The 16-pin MSOP package offers a compact solution for space-constrained boards. Verify thermal performance within the specified temperature range.

Part Context

This part belongs to the LTC2946 family of rail-to-rail system monitors. It provides precise measurements of electrical parameters including current, voltage, power, charge, and energy. The series is designed for industrial and automotive applications requiring robust monitoring capabilities across wide voltage ranges.

Replacement Considerations

LTC2946CMS-1#TRPBF is a related variant within the same family. Verify pinout and functional equivalence before substitution. Other members like LTC2946HDE#PBF share similar core features but differ in package type.