The TPA1285, high precision, high common voltage, 2 channel high-side current sense amplifier has very high precision accuracy specifications of Vos less than 100μV (max) and gain error less than 0.5% (max). Three fixed gains are available: 20V/V, 50V/V, and 100V/V. The low offset of the zerodrift architecture enables current sensing with maximum drops across the shunt as low as 5mV full-scale.

The TPA1285 features an input common-mode voltage range from 3.0V to 76V with 80kHz of small-signal bandwidth, which makes it ideal for small signal conditioning interfacing with a SAR ADC.

The TPA1285 offers breakthrough performance throughout the −40°C to +125°C temperature range. It features a zero-drift core, which leads to a maxim offset drift of 0.4μV/°C throughout the operating temperature range and the common-mode voltage range. The TPA1285 is offered 8-pin MSOP package.

Features

◼ VOLTAGE OFFSET: ±100uV (MAX)

◼ WIDE COMMON MODE VOLTAGE: 3.0V to +76V

◼ SUPPLY VOLTAGE: 3.0V to +5.5V

◼ 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: 20V/V

◆ TPA1285F: 50V/V

◆ TPA1285H: 100V/V

◼ Rail-to-Rail Output

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

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

Applications

◼ CURRENT SENSING (High−Side)

◼ BATTERY CHARGERS

◼ POWER MANAGEMENT

◼ AUTOMOTIVE

◼ SERVER BACKPLANES

◼ BASE STATIONS & TELECOM EQUIPMENT

◼ INDUSTRIAL CONTROL AND AUTOMATION