Adjustable ±24‐A current monitoring for battery applications with ±0.55% gain error from −40°C to 85°C

Abstract This study introduces a current‐sensing approach for battery monitoring and protection applications, using a low‐side shunt and an adjustable range. To address the challenge posed by the meagre resistance of the shunt, a preamplifier is used to amplify the small voltage signal across the shunt. The current sensing process incorporates chopper techniques, a current feedback instrumentation amplifier, and mismatch optimization methods to minimize sensing errors effectively. In addition to these methods, the conversion of current into digital form is facilitated by an analogue‐to‐digital converter. Trimming correction is used to mitigate the remaining errors. The current sensing circuit is realized using a 0.18 µm high voltage 100 V bipolar‐CMOS‐DMOS process. Remarkably, this circuit exhibits a gain error of ±0.55% across a range of ±24 A, spanning temperatures from −40°C to 85°C. Operating from a 5‐V LDO supply, it maintains an average current consumption of 12.9 µA while occupying an active area of 0.34 mm 2 .