STMicroelectronics has introduced a new low-side current-measurement amplifier, the TSC1801, designed to simplify high-accuracy sensing in various applications. This device integrates matched resistors to set the gain, which not only simplifies circuit design but also reduces bill-of-materials costs. The amplifier ensures gain accuracy within 0.15% over the entire temperature range, making it ideal for applications requiring precise current measurement.

The TSC1801 is capable of bidirectional current sensing and is optimized for use with precision low-value shunt resistors at low common-mode voltages. Its architecture is specifically designed for low-side sensing, which allows for tightly controlled parameters such as a total output error better than 0.5% and an offset voltage of ±200μV (maximum). The amplifier's 2.1MHz bandwidth rating enables pulse-by-pulse current control, even in very high-frequency power-management systems. This feature translates to smoother torque adjustment in motor drives and rapid over-current detection, protecting sensitive output-stage components.

The TSC1801 can accommodate a wide supply voltage range from 2.0V to 5.5V and operates within an extended temperature range of -40°C to +125°C. Automotive versions are available, qualified and characterized according to AEC-Q100 and Q003 or equivalent, with advanced screening according to AEC Q001 and Q002 or equivalent. The industrial-grade TSC1801BILT with a fixed gain of 20V/V is currently in production in a 6-lead SOT23 dual-in-line package, priced from $0.54 for orders of 1,000 pieces. The automotive-grade version will be available in Q2 2025.

For more information on the TSC1801 low-side current-measurement amplifier, please visit www.st.com/low-side-current-sensing.