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INA299

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-2V to 80V, bidirectional 650 kHz precise current-sense amplifier

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Data sheet

INA299

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Product details

Product type Analog output Common-mode voltage (max) (V) 80 Common-mode voltage (min) (V) -2 Input offset (±) (max) (µV) 150 Features Bidirectional, High precision, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100 CMRR (min) (dB) 110 Bandwidth (kHz) 230, 450, 650 Supply voltage (max) (V) 12 Supply voltage (min) (V) 2.7 Iq (max) (mA) 0.6 Number of channels 1 Comparators (#) 0 Gain error (%) 0.15 Gain error drift (±) (max) (ppm/°C) 10 Slew rate (V/µs) 2.5 Operating temperature range (°C) -40 to 125
Product type Analog output Common-mode voltage (max) (V) 80 Common-mode voltage (min) (V) -2 Input offset (±) (max) (µV) 150 Features Bidirectional, High precision, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100 CMRR (min) (dB) 110 Bandwidth (kHz) 230, 450, 650 Supply voltage (max) (V) 12 Supply voltage (min) (V) 2.7 Iq (max) (mA) 0.6 Number of channels 1 Comparators (#) 0 Gain error (%) 0.15 Gain error drift (±) (max) (ppm/°C) 10 Slew rate (V/µs) 2.5 Operating temperature range (°C) -40 to 125
SOT-23 (DBV) 6 8.12 mm² 2.9 x 2.8
  • Wide common-mode voltage:
    • Operational voltage: −2V to +80V
    • Survival voltage: −12V to +85V
  • Bidirectional operation
  • High small signal bandwidth: 650kHz (20V/V Gain)
  • Slew rate: 2.5V/µs
  • Step response settling time to 1%: 6.5µs
  • High CMRR: 120dB
  • Gain error (maximum) : ±0.25%, ±10ppm/°C drift
  • Offset voltage (maximum): ±150µV, ±0.5µV/°C drift
  • Operates from 2.7V to 12V supply
  • Operational current: 650µA
  • Available gains:
    • INA299A1: 20V/V
    • INA299A2: 50V/V
    • INA299A3: 100V/V
  • Package options: SOT23-6 (DBV)
  • Wide common-mode voltage:
    • Operational voltage: −2V to +80V
    • Survival voltage: −12V to +85V
  • Bidirectional operation
  • High small signal bandwidth: 650kHz (20V/V Gain)
  • Slew rate: 2.5V/µs
  • Step response settling time to 1%: 6.5µs
  • High CMRR: 120dB
  • Gain error (maximum) : ±0.25%, ±10ppm/°C drift
  • Offset voltage (maximum): ±150µV, ±0.5µV/°C drift
  • Operates from 2.7V to 12V supply
  • Operational current: 650µA
  • Available gains:
    • INA299A1: 20V/V
    • INA299A2: 50V/V
    • INA299A3: 100V/V
  • Package options: SOT23-6 (DBV)

The INA299 is a precise, bidirectional current sense amplifier that can measure voltage drops across shunt resistors over a wide common-mode range from –2V to 80V, independent of the supply voltage. The high-precision current measurement is achieved through a combination of low offset voltage (±150µV, maximum), small gain error (±0.25%, maximum) and a high DC CMRR (typical 120dB). The INA299 is not only designed for high voltage, bidirectional DC current measurements, but also for high-speed applications (such as transient detection and fast overcurrent protection) with a high signal bandwidth of 650kHz and fast settling time.

The INA299 operates from a single 2.7V to 12V supply, drawing 650µA of supply current. The INA299 is available in three gain options: 20V/V, 50V/V, 100V/V. Multiple gain options allow for optimization between available shunt resistor values and wide output dynamic range requirements.

The INA299 is specified over operating temperature range of −40°C to +125°C and is offered in a 6-pin SOT-23 package.

The INA299 is a precise, bidirectional current sense amplifier that can measure voltage drops across shunt resistors over a wide common-mode range from –2V to 80V, independent of the supply voltage. The high-precision current measurement is achieved through a combination of low offset voltage (±150µV, maximum), small gain error (±0.25%, maximum) and a high DC CMRR (typical 120dB). The INA299 is not only designed for high voltage, bidirectional DC current measurements, but also for high-speed applications (such as transient detection and fast overcurrent protection) with a high signal bandwidth of 650kHz and fast settling time.

The INA299 operates from a single 2.7V to 12V supply, drawing 650µA of supply current. The INA299 is available in three gain options: 20V/V, 50V/V, 100V/V. Multiple gain options allow for optimization between available shunt resistor values and wide output dynamic range requirements.

The INA299 is specified over operating temperature range of −40°C to +125°C and is offered in a 6-pin SOT-23 package.
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Technical documentation

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* Data sheet INA299 -2V to 80V , Bi-directional, 650kHz, High-Precision Current Sense Amplifier datasheet (Rev. A) PDF | HTML 04 Sep 2025
Certificate INA299EVM EU Declaration of Conformity (DoC) 19 Feb 2025

Design & development

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Evaluation board

INA299EVM — INA299 evaluation module

The INA299EVM is a small module with three completely independent boards that can be broken off by the designer. Three schematically identical boards are available for each of the three gain variations of the INA299 with inputs up to 80V common-mode and 10A (onboard shunt) input capability. Each (...)
User guide: PDF | HTML
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Calculation tool

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CS-AMPLIFIER-ERROR-TOOL — Current Sense Amplifier Comparison and Error Tool

This Excel calculator provides a comparison between two and five of our standard current sense amplifiers, delivering a chart containing the basic parameters of each device. This calculator also takes system condition inputs from users such as common-mode voltage, supply voltage, shunt resistor (...)
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Design tool

CIRCUIT060035 — Bidirectional current sensing with a window comparator circuit

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CIRCUIT060037 — Precision over-current latch circuit

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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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TINA-TI — SPICE-based analog simulation program

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