Description：

The TPA191 is a series of zero-drift, bi-directional currentsense amplifiers that can sense voltage drops acrossshunts at common-mode voltages from −0.3 V to 36 V,independent of the supply voltage. Five fixed gains areavailable: 20 V/V, 50 V/V, 75 V/V, 100 V/V, and 200 V/V.The integration-matched gain resistor network minimizesgain errors and reduces the temperature drift. The lowoffset of the zero-drift architecture enables current sensingwith the maximum drops across the shunt as low as 10 mVfull-scale.The TPA191 series operates from a single 2.7-V to 36-Vpower supply, while drawing 80-μA supply current (typical).All versions are specified from −40°C 125°C, and offeredin the SOT363 (SC70-6) package.

Features：

• Voltage Offset: ±100 μV (Max) at VCM = 2.75 Vfor TPA191A2, A3, A4, A5, A6, A7

• 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)

• 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

– TPA191A6: 500 V/V

– TPA191A7: 1000 V/V

• Low Supply Current: 80 μA (Typ)

• Rail-to-Rail Output

• Package: SOT363 (SC70-6)

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

Applications：

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

• Battery Charger

• Power Management

• Cell Phone Charger

• Electrical Cigarette

• Wireless Charger

• Telecom Equipment