Low-drift bidirectional single-supply low-side current sensing reference design

This Verified TI Precision Design implements a low-drift, bi-directional, low-side, single-supply current sensing solution that measures load currents from -2.5 A to +2.5 A.  The output range is from 250 mV to 2.75 V, with 0 A current centered at 1.5 V.  To achieve low-drift performance, the solution utilizes the INA213B and REF2030.  The design’s functionality and performance were verified by fabricating a PCB and measuring results over temperature from -40 °C to 125 °C.

Features:

Low-side current sensing
Measured load current: +/-2.5 A
250mV to 2.75V output
0 A centered at 1.5 V
±0.0522% Full-scale range error (-40 °C to 125 °C)
Low-drift, Single-supply

Parts Include:
INA213: Voltage Output, High/Low-Side Measurement, Bi-Directional Zero-Drift Series Current Shunt Monitor
REF2025: Low-Drift, Low-Power, Dual-Output VREF and VREF/2 Voltage Reference
REF2030: Low-Drift, Low-Power, Dual-Output VREF and VREF/2 Voltage Reference
REF2033: Low-Drift, Low-Power, Dual-Output VREF and VREF/2 Voltage Reference
REF2041 : Low-Drift, Low-Power, Dual-Output VREF and VREF/2 Voltage Reference

Learn more by downloading the reference design below