The TPA191 series of zero-drift, bi-directional current sense amplifier can sense voltage drops across shunts at common-mode voltages from −0.3 V to 36 V, independent of the supply voltage. Five fixed gains are available: 20 V/V, 50 V/V, 75 V/V, 100 V/V, and 200 V/V. The integration matched gain resistor network minimizes gain errors and reduces the temperature drift. The low offset of the zero-drift architecture enables current sensing with the maximum drops across the shunt as low as 10-mV full-scale. The TPA191 devices operate from a single 2.7-V to 36- V power supply, with drawing a typical of 80-μA supply current. All versions are specified from −40°C 125°C, and offered in the SOT363 package.

Features

• Voltage Offset:

– ±50 μV (Max) at VCM = 2.75 V

– ±180 μV (Max) at VCM = 12 V

• Wide Common-Mode Voltage: −0.3 V to +36 V

• Supply Voltage: 2.7 V to 36 V

• Accuracy and Zero-Drift Performance

– ±1% Gain Error (Max over temperature)

– 0.2 μV/°C Offset Drift (Typ)

– 10 ppm/°C Gain Drift (Max)

• Three Gain Options for Voltage Output

– TPA191A1: 20 V/V

– TPA191A2: 50 V/V

– TPA191A3: 75 V/V

– TPA191A4: 100 V/V

– TPA191A5: 200 V/V

• Low Supply Current: 80 μA (Typ)

• Rail-to-Rail Output

• Package: SOT363

• Industrial −40°C to 125°C Operating Range

Applications

• Current Sensing (High−Side/Low−Side)

• Battery Charger

• Power Management

• Cell Phone Charger

• Electrical Cigarette

• Wireless Charger

• Telecom Equipment