8 Detailed Description

8.1 Overview

The INA296x is a high or low-side bidirectional, high-speed current-sense amplifier that offers a wide common-

mode range, precision zero-drift topology, excellent common-mode rejection ratio (CMRR) and fast slew rate.

Different gain versions are available to optimize the output dynamic range based on the application. The

INA296x is designed using an architecture that enables low bias currents of 20 µA with a specified common-

mode voltage range from -4 V to 110 V with signal bandwidths up to 1 MHz.

8.2 Functional Block Diagram

+

±

+

±

IN+

IN-

GND

V

S

REF1

REF2

OUT

8.3 Feature Description

8.3.1 Amplifier Input Common-Mode Signal

The INA296x supports large input common-mode voltages from –4 V to +110 V. The internal topology of the

for the INA296x to be used for both low-side and high-side current-sensing applications that extend beyond the

supply range of 2.7 V to 20 V.

8.3.1.1 Input-Signal Bandwidth

The INA296x is available with several gain options including 10 V/V, 20 V/V, 50 V/V, 100 V/V, and 200 V/V.

The unique multistage design enables the amplifier to achieve high bandwidth at all gains. This high bandwidth

provides the throughput and fast response that is required for the rapid detection and processing of overcurrent

events.

8.3.1.2 Low Input Bias Current

The INA296x inputs draw a 20-µA (typical) bias current at a common-mode voltage as high as 110 V, which

enables precision current sensing on applications that require lower current leakage. Unlike many high voltage

current sense amplifiers whose input bias currents are proportional to the common-mode voltage, the input bias

current of the INA296x remains flat over the entire common-mode voltage range.

architecture of the INA296x provides the low offset voltage and low offset drift needed to measure low

is particularly beneficial when using low ohmic shunts for low current measurements, as power losses across the

shunt are significantly reduced.

8.3.1.4 Wide Fixed Gain Output

The INA296x maximum gain error is 0.05% at room temperature, with a maximum drift of 2.5 ppm/°C over the

full temperature range of –40°C to +125°C. The INA296x is available in multiple gain options of 10 V/V, 20 V/V,

INA296A, INA296B

SBOSA04 – MARCH 2022

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