Precision current sensing with a 2 µV offset floor
The INA190A4IRSWT is a zero-drift current-sense amplifier from Texas Instruments, packaged in a 10-UQFN (1.8x1.4 mm) — the smallest footprint in the INA190 family. Its 2 µV input offset voltage and 500 pA input bias current let it resolve microamp-level shunt drops without the thermal drift that plagues general-purpose op-amps in the same role.
Bandwidth and transient response for real-time monitoring
With a 33 kHz gain-bandwidth product and 20 kHz -3 dB bandwidth, this amplifier captures DC load changes and low-frequency ripple on the sense line — suitable for battery monitoring, solenoid current profiling, or overcurrent detection where the event time constant is above 50 µs. The 0.25 V/µs slew rate limits the output edge rate, so the downstream ADC or comparator sees a clean, settled signal without external filtering. The rail-to-rail output swings within 50 mV of the supply rails, preserving the full ADC input range when the sense resistor is sized for a 50 mV full-scale drop.
Temperature grade and supply envelope
The 1.7 V minimum supply means it can operate from a single lithium cell or a 1.8 V regulated rail, while the 5.5 V maximum covers 5 V systems without a secondary LDO.