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INA301

ACTIVE

36V, 550kHz, 4V/µs, high-precision current sense amplifier w/ comparator

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Data sheet

INA301

ACTIVE
Data sheet Order now

Product details

Product type Analog output with integrated comparator Common-mode voltage (max) (V) 36 Common-mode voltage (min) (V) 0 Input offset (±) (max) (µV) 35, 50, 125 Input offset drift (±) (typ) (µV/°C) 0.1 Features Alert Function, High precision, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100 CMRR (min) (dB) 100 Bandwidth (kHz) 450, 500, 550 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 Iq (max) (mA) 0.7 Number of channels 1 Comparators (#) 1 Gain error (%) 0.1, 0.15, 0.2 Gain error drift (±) (max) (ppm/°C) 10 Slew rate (V/µs) 4 Operating temperature range (°C) -40 to 125
Product type Analog output with integrated comparator Common-mode voltage (max) (V) 36 Common-mode voltage (min) (V) 0 Input offset (±) (max) (µV) 35, 50, 125 Input offset drift (±) (typ) (µV/°C) 0.1 Features Alert Function, High precision, Low-side Capable Rating Catalog Voltage gain (V/V) 20, 50, 100 CMRR (min) (dB) 100 Bandwidth (kHz) 450, 500, 550 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 Iq (max) (mA) 0.7 Number of channels 1 Comparators (#) 1 Gain error (%) 0.1, 0.15, 0.2 Gain error drift (±) (max) (ppm/°C) 10 Slew rate (V/µs) 4 Operating temperature range (°C) -40 to 125
VSSOP (DGK) 8 14.7 mm² 3 x 4.9
  • Wide Common-Mode Input Range: 0 V to 36 V
  • Dual Output: Amplifier and Comparator Output
  • High Accuracy Amplifier:
    • Offset Voltage: 35 µV (Max)
    • Offset Voltage Drift: 0.5 µV/°C (Max)
    • Gain Error: 0.1% (Max)
    • Gain Error Drift: 10 ppm/°C
  • Available Amplifier Gains:
    • INA301A1: 20 V/V
    • INA301A2: 50 V/V
    • INA301A3: 100 V/V
  • Programmable Alert Threshold Set Through a Single Resistor
  • Total Alert Response Time: 1 µs
  • Open-Drain Output With Latching Mode
  • Package: VSSOP-8
  • Wide Common-Mode Input Range: 0 V to 36 V
  • Dual Output: Amplifier and Comparator Output
  • High Accuracy Amplifier:
    • Offset Voltage: 35 µV (Max)
    • Offset Voltage Drift: 0.5 µV/°C (Max)
    • Gain Error: 0.1% (Max)
    • Gain Error Drift: 10 ppm/°C
  • Available Amplifier Gains:
    • INA301A1: 20 V/V
    • INA301A2: 50 V/V
    • INA301A3: 100 V/V
  • Programmable Alert Threshold Set Through a Single Resistor
  • Total Alert Response Time: 1 µs
  • Open-Drain Output With Latching Mode
  • Package: VSSOP-8

The INA301 includes both a high common-mode, current-sensing amplifier and a high-speed comparator configured to detect overcurrent conditions through measuring the voltage developed across a current-sensing or current-shunt resistor and comparing that voltage to a defined threshold limit. The device features an adjustable limit threshold range that is set using a single external limit-setting resistor. This current-shunt monitor can measure differential voltage signals on common-mode voltages that can vary from 0 V up to 36 V, independent of the supply voltage.

The open-drain alert output can be configured to operate in either a transparent mode where the output status follows the input state or in a latched mode where the alert output is cleared when the latch is reset. The device alert response time is under 1 µs, allowing for quick detection of overcurrent events.

This device operates from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 700 µA. The device is specified over the extended operating temperature range (–40°C to +125°C), and is available in an 8-pin VSSOP package.

The INA301 includes both a high common-mode, current-sensing amplifier and a high-speed comparator configured to detect overcurrent conditions through measuring the voltage developed across a current-sensing or current-shunt resistor and comparing that voltage to a defined threshold limit. The device features an adjustable limit threshold range that is set using a single external limit-setting resistor. This current-shunt monitor can measure differential voltage signals on common-mode voltages that can vary from 0 V up to 36 V, independent of the supply voltage.

The open-drain alert output can be configured to operate in either a transparent mode where the output status follows the input state or in a latched mode where the alert output is cleared when the latch is reset. The device alert response time is under 1 µs, allowing for quick detection of overcurrent events.

This device operates from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 700 µA. The device is specified over the extended operating temperature range (–40°C to +125°C), and is available in an 8-pin VSSOP package.
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INA300 ACTIVE 36V current sense comparator The INA300 offers only an ALERT signal
INA302 ACTIVE 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amplifier w/ dual comparators The INA302 has dual integrated comparators
INA303 ACTIVE 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amplifier w/ window comparator The INA303 has window comparotor functionality
INA381 ACTIVE 26-V, 350-kHz current sense amplifier with integrated over-current comparator The INA381 has similar functionality with lower perfomance at a lower price.

Technical documentation

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* Data sheet INA301 36-V, High-Speed, Zero-Drift, Voltage-Output, Current-Shunt Monitor with High-Speed, Overcurrent Comparator datasheet (Rev. A) PDF | HTML 11 Feb 2016
Application note Risks and Prevention of ESD, EOS, and Latch Up Events for Current Sense Amplifiers PDF | HTML 18 Nov 2024
Application brief Current Sensing Applications in Communication Infrastructure Equipment (Rev. C) PDF | HTML 08 Aug 2023
Application brief Integrating the Current Sensing Resistor (Rev. D) PDF | HTML 07 Apr 2023
Technical article 4 key current-sensing design trends that are powering electrification PDF | HTML 21 Feb 2023
Application brief Precision Current Measurements on High-Voltage Power-Supply Rails (Rev. F) PDF | HTML 17 Oct 2022
E-book An Engineer's Guide to Current Sensing (Rev. B) 12 Apr 2022
Application brief Measuring Current To Detect Out-of-Range Conditions (Rev. D) PDF | HTML 10 Mar 2022
Application note Using a PCB Copper Trace as a Current-Sense Shunt Resistor PDF | HTML 25 Jan 2022
Application brief Measuring Current for Handle Multiple Out-of-Range Conditions (Rev. C) PDF | HTML 04 Oct 2021
Application brief Integrating the Current Sensing Signal Path (Rev. B) PDF | HTML 29 Sep 2021
Selection guide Current Sense Amplifiers (Rev. E) 20 Sep 2021
Application brief High-Side Motor Current Monitoring for Over-Current Protection (Rev. B) PDF | HTML 23 Feb 2021
Technical article Use fast, precise overcurrent detection to enable diagnostics in automotive safety PDF | HTML 24 Jun 2019
Application brief Bidirectional, Low-Side Phase Current Sensing With Onboard Overcurrent Detection (Rev. D) 06 Mar 2019
Application brief External current sense amps vs integrated onboard amplifiers for current sensing (Rev. B) 19 Feb 2019
Technical article A key to accurate system thermal management: monitoring both current flow and temp PDF | HTML 04 Oct 2018
Circuit design Overcurrent event detection circuit 31 Jul 2018
Application note Closed-Loop Analysis of Load-Induced Amplifier Stability Issues Using Zout 27 Oct 2017
Application brief Low-Drift, Low-Side Current Measurements for Three-Phase Systems (Rev. B) 05 Sep 2017
White paper Overcurrent protection enables more efficient and reliable systems 16 May 2016

Design & development

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

Evaluation board

INA301EVM — INA301 Evaluation Module

Three different gain devices in the same EVM package, which enables the custome quickly setup and evaluate any or all the devices as desired.

User guide: PDF
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Simulation model

INA301 PSpice Model

SBOMA60.ZIP (71 KB) - PSpice Model
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Simulation model

INA301 TINA-TI Reference Design (Rev. A)

SBOM959A.TSC (468 KB) - TINA-TI Reference Design
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Simulation model

INA301 TINA-TI Spice Model (Rev. A)

SBOM960A.ZIP (22 KB) - TINA-TI Spice Model
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Simulation model

INA301A1 PSpice Model

SBOMBH1.ZIP (28 KB) - PSpice Model
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Simulation model

INA301A2 PSpice Model

SBOMBF4.ZIP (27 KB) - PSpice Model
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Simulation model

INA301A3 PSpice Model

SBOMBH2.ZIP (28 KB) - PSpice Model
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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 (...)

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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 (...)
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Design tool

CIRCUIT060034 — Overcurrent event detection circuit

This is a unidirectional current sensing solution generally referred to as overcurrent protection (OCP) that can provide an overcurrent alert signal to shut off a system for a threshold current and re-engage the system once the output drops below a desired voltage (Vout_release) lower than the (...)
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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

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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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 (...)
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Reference designs

TIDA-010065 — High-efficiency, low-emission, isolated DC/DC converter-based analog input module reference design

This reference design is a simplified architecture for generating an isolated power supply for isolated amplifiers for measuring isolated voltages and currents. A fully integrated DC/DC converter with reinforced isolation operating from a 5-V input with configurable 5-V or 5.4-V output (headroom (...)
Design guide: PDF
Schematic: 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
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PMP22125 — Battery back-up switch, charger and monitor reference design

A complete battery back-up, charger and monitoring is implemented with this reference design.  It includes switching between a 12/24-Vdc source and 12/24-V lead acid battery, constant current battery charging at 1A typical, battery maintenance float charge and monitoring circuits for the (...)
Test report: PDF
Schematic: PDF
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