LTC2946MPMS#TRPBF

Overview

The LTC2946MPMS#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 common-mode voltage range of 2.7 V to 100 V and includes an internal shunt regulator for supplies exceeding 100 V. Key electrical specifications include a maximum supply voltage of 100 V, a minimum operating temperature of -55°C, and a maximum operating temperature of +125°C. It features a typical quiescent current of 900 µA, an input offset voltage of 77 µV, and a gain error of 0.5%. The component is housed in a 16-lead MSOP package and is supplied in tape and reel format.

Feature Summary

• Rail-to-rail system monitoring capability for measuring current, voltage, power, charge, and energy
• Integrated shunt regulator enabling operation with supply voltages above 100 V
• I2C digital interface for data communication and configuration
• Automotive-grade reliability with extended temperature range support

Applications

• Negative power, charge, and energy monitoring in harsh environments
• Bidirectional power monitoring with forward path energy and charge tracking
• Wide-range negative power supply supervision using INTVCC shunt regulators

Procurement Notes

Verify the specific suffix TRPBF indicates tape and reel packaging rather than tube. Confirm automotive qualification status if required for your application. Check for recent production change notices regarding bond wire or epoxy materials. Ensure compatibility with your I2C bus voltage levels. Validate that the MSOP-16 package fits your PCB footprint constraints.

Selection Notes

Select this part when high-side current sensing up to 100 V is required alongside precise energy integration. The automotive grade variant suits applications demanding extended temperature performance. Consider the integrated shunt regulator if input transients exceed standard supply limits. Evaluate the 900 µA quiescent current against system power budgets. Verify I2C addressability if multiple monitors are used on the same bus.

Part Context

This component belongs to the LTC2946 family of wide-range power, charge, and energy monitors. It shares core functionality with variants like the LTC2946HMS and LTC2946CMS but differs in grading and packaging. The MPMS designation typically denotes automotive-grade performance. The TRPBF suffix specifies the tape and reel delivery method suitable for automated assembly processes.

Replacement Considerations

Direct substitutes include other LTC2946 family members such as LTC2946HMS#PBF or LTC2946IMS#PBF, noting differences in packaging and temperature grading. Cross-reference pinouts and register maps before substitution. Verify that alternative packages meet thermal and mechanical requirements.