LTC2946CDE#PBF

Overview

The LTC2946CDE#PBF 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 supports supply voltages from 2.7 V to 100 V. Key electrical specifications include a maximum operating supply current of 700 µA, an input offset voltage (Vos) of 77 µV, and a gain error of 0.4%. It functions reliably across an extended temperature range of -40°C to +125°C.

Feature Summary

• Integrates high-precision measurement capabilities for current, voltage, power, charge, and energy in a single channel.
• Features a wide operating common-mode voltage range supporting both positive and negative supply monitoring applications.
• Includes an internal shunt regulator designed to handle supply voltages exceeding 100 V.

Applications

• Power, charge, and energy monitoring in -48V systems using low-side sensing with a 1.5kHz I2C interface
• Bidirectional power monitoring with energy and charge tracking in the forward path
• Wide-range negative power, charge, and energy monitoring for supplies ranging from -4V to -500V

Procurement Notes

Verify component authenticity through authorized Analog Devices channels or certified distributors. Confirm that the received part matches the specific suffix #PBF for lead-free tube packaging. Check RoHS compliance status and ensure the device meets automotive qualification requirements if specified for the target application environment.

Selection Notes

Select this variant when a DFN-16 surface-mount package is required for space-constrained designs. Choose the C-grade version for standard industrial temperature performance. Ensure the design accommodates the 700 µA supply current and utilizes the I2C interface for data communication. Verify that the system voltage remains within the 2.7 V to 100 V operational limits.

Part Context

This component belongs to the LTC2946 series of wide-range I2C power, charge, and energy monitors. It shares functional similarities with other variants such as the LTC2946HDE#PBF and LTC2946IMS#PBF, differing primarily in accuracy grades and package types. The series provides a unified solution for comprehensive energy management across various industrial and automotive platforms.

Replacement Considerations

Direct substitutes within the same family include the LTC2946HDE#PBF and LTC2946CDE-1#PBF. These alternatives share identical pinouts and core functionality but may differ in accuracy specifications or temperature ranges. Verify compatibility before substitution.