Description:

The TPA1285, high-precision, high common-voltage, 2-channel high-side current sense amplifier, has very highprecision accuracy specifications of Vos less than 100 μV(max) and gain error less than 0.5% (max). Three fixedgains are available: 20 V/V, 50 V/V, and 100 V/V. The lowoffset of the zero-drift architecture enables current sensingwith maximum drops across the shunt as low as 5 mVfull-scale.The TPA1285 features an input common-mode voltageranging from 3.0 V to 76 V with 80 kHz of smallsignal bandwidth, which makes it ideal for small signalconditioning interfacing with a SAR ADC.The TPA1285 offers breakthrough performance throughoutthe −40°C to +125°C temperature range. It features azero-drift core, which leads to a maxim offset drift of0.4μV/°C throughout the operating temperature range andthe common-mode voltage range. The TPA1285 is offeredan 8-pin MSOP package.

Features:

• Voltage Offset: ±100 μV (MAX)

• Wide Common-Mode Voltage: 3 V to 76 V

• Supply Voltage: 3 V to 5.5 V

• Accuracy and Zero-Drift Performance

– ±0.5% Gain Error (Max over temperature)

– 0.4μV/°C Offset Drift (Max, −40°C ~125°C)

– 10ppm/°C Gain Drift (Max)

• Three Gain Options for Voltage Output

– TPA1285T: 20 V/V

– TPA1285F: 50 V/V

– TPA1285H: 100 V/V

• Rail-to-Rail Output

• Industrial –40°C to 125°C Operation Range

• ESD Rating: Robust 2.5 kV – HBM, 1.5 kV – CDM

Applications:

• Current Sensing (high side)

• Battery Chargers

• Power Management

• Automotive

• Server Backplanes

• Base Stations & Telecom Equipment

• Industrial Control and Automation