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INA185

ACTIVE

26-V, 350-kHz, bi-directional, high-precision current sense amplifier in ultra-small SOT-563 package

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Data sheet

INA185

ACTIVE
Data sheet Order now

Product details

Product type Analog output Common-mode voltage (max) (V) 26 Common-mode voltage (min) (V) -0.2 Input offset (±) (max) (µV) 55, 135 Input offset drift (±) (typ) (µV/°C) 0.2 Features Bidirectional, High precision, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100, 200, 500 CMRR (min) (dB) 86, 96, 106 Bandwidth (kHz) 60, 105, 150, 210, 350 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 Iq (max) (mA) 0.3 Number of channels 1 Comparators (#) 0 Gain error (%) 0.12, 0.17 Gain error drift (±) (max) (ppm/°C) 8 Slew rate (V/µs) 2 Operating temperature range (°C) -40 to 125
Product type Analog output Common-mode voltage (max) (V) 26 Common-mode voltage (min) (V) -0.2 Input offset (±) (max) (µV) 55, 135 Input offset drift (±) (typ) (µV/°C) 0.2 Features Bidirectional, High precision, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100, 200, 500 CMRR (min) (dB) 86, 96, 106 Bandwidth (kHz) 60, 105, 150, 210, 350 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 Iq (max) (mA) 0.3 Number of channels 1 Comparators (#) 0 Gain error (%) 0.12, 0.17 Gain error drift (±) (max) (ppm/°C) 8 Slew rate (V/µs) 2 Operating temperature range (°C) -40 to 125
SOT-5X3 (DRL) 6 2.56 mm² 1.6 x 1.6 SOT-SC70 (DCK) 6 4.2 mm² 2 x 2.1
  • SC70 and SOT-563 packages
    • SC70 offers compatibility to existing solutions
    • SOT-563 is 39% smaller footprint than SC70
    • SOT-563 dimensions is 1.6 mm × 1.6 mm × 0.55 mm
  • Common-mode range (VCM): –0.2 V to +26 V
  • High bandwidth: 350 kHz (A1 devices)
  • Offset voltage:
    • ±55 µV (maximum) at VCM = 0 V
    • ±100 µV (maximum) at VCM = 12 V (A4 device)
  • Output slew rate: 2 V/µs
  • Bidirectional current-sensing capability
  • Accuracy:
    • Maximum gain error (A1, A2, A3): ±0.2%
    • Maximum offset drift: 0.5 µV/°C
  • Gain options:
    • 20 V/V (A1 devices)
    • 50 V/V (A2 devices)
    • 100 V/V (A3 devices)
    • 200 V/V (A4 devices)
  • Quiescent current: 260 µA (maximum)
  • SC70 and SOT-563 packages
    • SC70 offers compatibility to existing solutions
    • SOT-563 is 39% smaller footprint than SC70
    • SOT-563 dimensions is 1.6 mm × 1.6 mm × 0.55 mm
  • Common-mode range (VCM): –0.2 V to +26 V
  • High bandwidth: 350 kHz (A1 devices)
  • Offset voltage:
    • ±55 µV (maximum) at VCM = 0 V
    • ±100 µV (maximum) at VCM = 12 V (A4 device)
  • Output slew rate: 2 V/µs
  • Bidirectional current-sensing capability
  • Accuracy:
    • Maximum gain error (A1, A2, A3): ±0.2%
    • Maximum offset drift: 0.5 µV/°C
  • Gain options:
    • 20 V/V (A1 devices)
    • 50 V/V (A2 devices)
    • 100 V/V (A3 devices)
    • 200 V/V (A4 devices)
  • Quiescent current: 260 µA (maximum)

The INA185 current sense amplifier is designed for use in cost-sensitive space constrained applications. This device is a bidirectional, current-sense amplifier (also called a current-shunt monitor) that senses the voltage drop across a current-sense resistor at common-mode voltages from –0.2 V to +26 V, independent of the supply voltage. The INA185 integrates a matched resistor gain network in four, fixed-gain device options: 20 V/V, 50 V/V, 100 V/V, or 200 V/V. This matched gain resistor network minimizes gain error and reduces the temperature drift.

The INA185 operates from a single 2.7-V to 5.5-V power supply. The device draws a maximum supply current of 260 µA and features high slew rate and bandwidth making this device an excellent choice for many power-supply and motor-control applications.

The INA185 is available in an industry standard SC70 package and low profile 6-pin, SOT-563 package. The SOT-563 package has a body size of size of only 2.56 mm2, including the device pins. All device options are specified over the extended operating temperature range of –40°C to +125°C.

The INA185 current sense amplifier is designed for use in cost-sensitive space constrained applications. This device is a bidirectional, current-sense amplifier (also called a current-shunt monitor) that senses the voltage drop across a current-sense resistor at common-mode voltages from –0.2 V to +26 V, independent of the supply voltage. The INA185 integrates a matched resistor gain network in four, fixed-gain device options: 20 V/V, 50 V/V, 100 V/V, or 200 V/V. This matched gain resistor network minimizes gain error and reduces the temperature drift.

The INA185 operates from a single 2.7-V to 5.5-V power supply. The device draws a maximum supply current of 260 µA and features high slew rate and bandwidth making this device an excellent choice for many power-supply and motor-control applications.

The INA185 is available in an industry standard SC70 package and low profile 6-pin, SOT-563 package. The SOT-563 package has a body size of size of only 2.56 mm2, including the device pins. All device options are specified over the extended operating temperature range of –40°C to +125°C.
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Technical documentation

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* Data sheet INA185 26-V, 350-kHz, Bidirectional, High-Precision Current Sense Amplifier in Ultra-Small (SOT-563) Package datasheet (Rev. A) PDF | HTML 29 Nov 2023
Application note Risks and Prevention of ESD, EOS, and Latch Up Events for Current Sense Amplifiers PDF | HTML 18 Nov 2024
Circuit design Precision overcurrent latch circuits (Rev. A) PDF | HTML 27 Sep 2024
Application note Using a PCB Copper Trace as a Current-Sense Shunt Resistor PDF | HTML 25 Jan 2022
Circuit design Circuit to measure multiple redundant source currents with singled-ended signal PDF | HTML 28 Jun 2021
Circuit design Adjustable-gain, current-output, high-side current-sensing circuit 09 Aug 2019
Technical article Minimizing input power protection for smart speakers and smart displays PDF | HTML 24 Jun 2019
Technical article Use fast, precise overcurrent detection to enable diagnostics in automotive safety PDF | HTML 24 Jun 2019
Circuit design Fast-response overcurrent event detection circuit 27 May 2019
Application brief Bidirectional, Low-Side Phase Current Sensing With Onboard Overcurrent Detection (Rev. D) 06 Mar 2019
Application brief Precision, Low-Side Current Measurement (Rev. B) 06 Mar 2019

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

INA185EVM — INA185 current sensing evaluation module

The INA185 is a current sense monitor solution that provides ease of use and high performance in a small package.  The INA185EVM is intended to provide basic functional evaluation of the device family. The fixture layout is not intended as a model for the target circuit, nor it is laid out (...)
User guide: PDF
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Simulation model

INA185 TINA-TI Reference Design

SBOMAY3.TSC (376 KB) - TINA-TI Reference Design
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Simulation model

INA185 TINA-TI Spice Model

SBOMAY4.ZIP (37 KB) - TINA-TI Spice Model
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Simulation model

INA185A1 PSpice Model

SBOMBA8.ZIP (23 KB) - PSpice Model
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Simulation model

INA185A2 PSpice Model

SBOMBF1.ZIP (24 KB) - PSpice Model
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Simulation model

INA185A3 PSpice Model

SBOMBF0.ZIP (24 KB) - PSpice Model
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Simulation model

INA185A4 PSpice Model

SBOMBE9.ZIP (24 KB) - PSpice Model
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Simulation model

Precision Over-Current Latch Circuit

SBVM944.ZIP (12 KB) - TINA-TI Reference Design
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Calculation tool

ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)

Supported products & hardware

Supported products & hardware
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Calculation tool

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 (...)
Supported products & hardware

Supported products & hardware
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Design tool

CIRCUIT060035 — Bidirectional current sensing with a window comparator circuit

This bidirectional current sensing solution uses a current-sense amplifier and a high-speed dual comparator with a rail-to-rail input common mode range to create over-current (OC) alert signals at the comparator outputs (OUTA and OUTB) if the input current (IG1) rises above 100 A or falls below (...)
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Design tool

CIRCUIT060036 — Adjustable-gain, current-output, high-side current-sensing circuit

This circuit demonstrates how to convert a voltage-output, current sense amplifier (CSA) into a current-output circuit using an operational amplifier (op amp) and a current-setting resistor (RSET). Taking advantage of the matched internal resistor gain network of the current sense amplifier, this (...)
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Design tool

CIRCUIT060037 — Precision over-current latch circuit

This high-side, current sensing solution uses a current sense amplifier, a comparator with an integrated reference and a P-channel MOSFET to create an over-current latch circuit. When a load current greater than 200 mA is detected, the circuit disconnects the system from its power source. The (...)
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Design tool

CIRCUIT060038 — Fast-response overcurrent event detection circuit

This is a fast-response unidirectional current-sensing solution, generally referred to as overcurrent protection (OCP), that can provide a < 2-μs time response, tresp, overcurrent alert signal to power off a system exceeding a threshold current. In this particular setup, the normal operating (...)
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Simulation tool

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

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
User guide: PDF
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Reference designs

TIDA-010954 — 600W GaN-based single-phase cycloconverter reference design

This reference design implements a 600W bidirectional single-stage DC-AC inverter based on cycloconverter (AC-DAB) topology and TI GaN power stages. The design supports up to 60V and ±16A on the DC side and on the single-phase, 230VAC and 2.6A. The inverter supports bidirectional power flow and (...)
Design guide: PDF
Reference designs

TIDA-00302 — Current Shunt Monitor with Transient Robustness Reference Design

This high-side current shunt monitor is used to measure the voltage developed across a current-sensing resistor when current passes through it.

Additionally, an external protection circuit is implemented to provide surge and fast-transient protection and demonstrate the different immunity levels to (...)

Design guide: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
SOT-5X3 (DRL) 6 Ultra Librarian
SOT-SC70 (DCK) 6 Ultra Librarian
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