A ± 12-A High-Side Current Sensor With 25 V Input CM Range and 0.35% Gain Error From −40 °C to 85 °C
Long Xu (TU Delft - Electronic Instrumentation)
Saleh Heidary Shalmany (SiTime)
Johan H. Huijsing (TU Delft - Electronic Instrumentation)
Kofi Makinwa (TU Delft - Microelectronics)
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Abstract
This letter presents the most accurate shunt-based high-side current sensor ever reported. It achieves a 25 V input common-mode range from a single 1.8-V supply by using a beyond-the-rails ADC. A hybrid analog/digital temperature compensation scheme is proposed to simplify the circuit implementation while maintaining the state-of-the-art accuracy. Over a ±12-A current range, the sensor exhibits 0.35% gain error from -40 °C to 85 °C with 3× better power efficiency.