Current sense amp increases accuracy in high-temp applications

February 16, 2021 //By Christoph Hammerschmidt
Current sense amp increases accuracy in high-temp applications
Microchip has introduced a high-side current sense amplifier with very low offset for AEC-Q100 Grade 0 qualified devices. The device enables a more accurate and energy efficient current measurement for those applications exposed to extreme temperatures.

With the proliferation of automation and connectivity throughout the automotive markets, the need to accurately measure a dynamic current in the presence of high frequency noise often plagues modern vehicle applications. In order to combat electrically noisy environments and address the need for higher accuracy current measurement, Microchip Technology introduced a family of high-side current sense amplifiers. Delivering a maximum offset error of just 12 µV, these devices are featuring the industry’s lowest offset for AEC-Q100 Grade 0 qualified high-side current sense amplifiers, promises Microchip.

The MCP6C02 amplifier is offered in both a Grade 1 6-pin SOT-23 package and a Grade 0 8-pin 3x3 VDFN package. Specified over a temperature range of -40°C to +150°C, its low offset error allows the use of smaller value shunt resistors while also maintaining a high measurement resolution. This enables a more accurate and energy efficient current measurement solution for those applications exposed to extreme temperatures, like the motor within a vehicle’s water pump. In addition, the VDFN package is processed with wettable flank plating, allowing for visual inspection of the solder joints and removing the need for x-ray scanning as required for traditional DFN packages.

Microchip’s MCP6C02 and MCP6C04 devices also feature an on-chip electromagnetic interference (EMI) filter and a zero-drift architecture. The EMI filter helps provide added protection against high-frequency electrical interference, such as wireless hotspots and radio frequencies, while the self-correcting architecture brings increased accuracy to current measurement. Together these features enable developers to create higher performance solutions in a wide variety of applications, such as creating a current controlled feedback loop for a power supply or motor, monitoring and charging batteries, or monitoring current levels for safety reasons.

Along with the MCP6C0x amplifiers, Microchip is offering the ADM01104 evaluation board that supports both variants. To avoid subjection to high voltages and currents, the evaluation board ships pre-populated, providing protection of the input pins.

For more information  visit Microchip’s website .


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