LTC2946CMS-1#PBF

Overview

The LTC2946CMS-1#PBF is a wide-range negative power, charge, and energy monitor designed for I2C interfaces operating at 10kHz. It functions as a rail-to-rail system monitor capable of measuring current, voltage, power, charge, and energy. The device supports an operating voltage range from 2.7V to 100V and includes a shunt regulator for supplies exceeding 100V. It is housed in a 16-pin MSOP package.

Feature Summary

• Measures current, voltage, power, charge, and energy in a single integrated circuit
• Supports wide-range negative power monitoring with specific configuration for -4V to -500V applications
• Includes an internal shunt regulator to tolerate supply voltages above 100V
• Features a 10kHz I2C interface for communication

Applications

• Wide-range negative power monitoring in harsh environments
• Bidirectional power monitoring with energy and charge measurement in the forward path
• -48V system power monitoring using low-side sensing
• Main supply power, charge, and energy monitoring alongside secondary supply monitoring

Procurement Notes

Verify the specific suffix '-1' indicates the 10kHz I2C interface variant when ordering. Confirm the package type is 16-pin MSOP and that the '#PBF' designation corresponds to the tube packaging format. Ensure compatibility with automotive or industrial temperature ranges if required by the application environment.

Selection Notes

Select this component for applications requiring comprehensive energy and charge tracking rather than simple voltage supervision. It is suitable for systems where high-voltage tolerance via the internal shunt regulator is necessary. Consider the 10kHz I2C speed limitation against system data rate requirements. Evaluate the need for bidirectional monitoring capabilities if reverse power flow occurs.

Part Context

This part belongs to the LTC2946 family of rail-to-rail system monitors manufactured by Analog Devices Inc. The family includes variants with different packages such as DFN and MSOP, and options for standard or extended temperature ranges. The CMS-1 designation specifically denotes the MSOP package with the 10kHz I2C interface capability.

Replacement Considerations

Direct substitutes within the same family include the LTC2946HMS-1#PBF, which shares similar electrical characteristics but may differ in temperature grade or specific pinout configurations. Verify functional equivalence regarding the shunt regulator and I2C interface speed before substitution.