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Analog current-sense amplifiers

INA300

ACTIVE

36V current sense comparator

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Data sheet

INA300

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) 650 Input offset drift (±) (typ) (µV/°C) 0.1 Features Alert Function, Low-side Capable Rating Catalog CMRR (min) (dB) 100 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 Iq (max) (mA) 0.15 Number of channels 1 Comparators (#) 1 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) 650 Input offset drift (±) (typ) (µV/°C) 0.1 Features Alert Function, Low-side Capable Rating Catalog CMRR (min) (dB) 100 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 Iq (max) (mA) 0.15 Number of channels 1 Comparators (#) 1 Operating temperature range (°C) -40 to 125
VSSOP (DGS) 10 14.7 mm² 3 x 4.9 WSON (DSQ) 10 4 mm² 2 x 2
  • Wide Common-Mode Range: 0 V to 36 V
  • Selectable Response Times:
    • 10 µs, 50 µs, 100 µs
  • Programmable Threshold:
    • Adjust Using Single Resistor
    • Programmable From 0 mV to 250 mV
  • Accuracy:
    • Offset Voltage: ±500 µV (Maximum)
    • Offset Voltage Drift: 0.5 µV/°C (Maximum)
  • Selectable Hysteresis:
    • 2 mV, 4 mV, 8 mV
  • Active Quiescent Current: 135 µA (Maximum)
  • Selectable Disable Mode
    • Disabled Quiescent Current: 3.5 µA (Maximum)
    • Disabled Input Bias Current: 500 nA (Maximum)
  • Open-Drain Output With Latch Mode Available
  • Wide Common-Mode Range: 0 V to 36 V
  • Selectable Response Times:
    • 10 µs, 50 µs, 100 µs
  • Programmable Threshold:
    • Adjust Using Single Resistor
    • Programmable From 0 mV to 250 mV
  • Accuracy:
    • Offset Voltage: ±500 µV (Maximum)
    • Offset Voltage Drift: 0.5 µV/°C (Maximum)
  • Selectable Hysteresis:
    • 2 mV, 4 mV, 8 mV
  • Active Quiescent Current: 135 µA (Maximum)
  • Selectable Disable Mode
    • Disabled Quiescent Current: 3.5 µA (Maximum)
    • Disabled Input Bias Current: 500 nA (Maximum)
  • Open-Drain Output With Latch Mode Available

Designed for overcurrent protection applications, the INA300 is a current-sensing comparator that detects overcurrent by measuring the voltage developed across a shunt resistor, and comparing that voltage to the threshold voltage input level. The device measures this differential voltage signal on common-mode voltages that can vary from 0 V up to 36 V, independent of the supply voltage. The INA300 device features an adjustable threshold range that is set using a single external limit-setting resistor. A selectable hysteresis feature enables adjustable operation of the comparator to accommodate the wide input signal range of 0 mV to 250 mV.

An open-drain alert output on the device 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 cleared. The device response time setting is selectable, which enables overcurrent alerts to be issued in as fast as 10 µs.

The INA300 device operates from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 135 µA. The INA300 device is specified over the extended operating temperature range of –40°C to +125°C, and is available in WSON-10 and VSSOP-10 packages.

Designed for overcurrent protection applications, the INA300 is a current-sensing comparator that detects overcurrent by measuring the voltage developed across a shunt resistor, and comparing that voltage to the threshold voltage input level. The device measures this differential voltage signal on common-mode voltages that can vary from 0 V up to 36 V, independent of the supply voltage. The INA300 device features an adjustable threshold range that is set using a single external limit-setting resistor. A selectable hysteresis feature enables adjustable operation of the comparator to accommodate the wide input signal range of 0 mV to 250 mV.

An open-drain alert output on the device 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 cleared. The device response time setting is selectable, which enables overcurrent alerts to be issued in as fast as 10 µs.

The INA300 device operates from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 135 µA. The INA300 device is specified over the extended operating temperature range of –40°C to +125°C, and is available in WSON-10 and VSSOP-10 packages.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet INA300 Overcurrent-Protection, Current-Sense Comparator datasheet (Rev. C) 18 Jun 2021
Application note Risks and Prevention of ESD, EOS, and Latch Up Events for Current Sense Amplifiers PDF | HTML 18 Nov 2024
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
Selection guide Current Sense Amplifiers (Rev. E) 20 Sep 2021
Application brief Bidirectional, Low-Side Phase Current Sensing With Onboard Overcurrent Detection (Rev. D) 06 Mar 2019
Circuit design Overcurrent event detection circuit 31 Jul 2018
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
Technical article How to get started with current sense amplifiers – part 3 PDF | HTML 09 Jul 2015
Technical article What are you sensing? Re-thinking system efficiency and reliability - part 1 PDF | HTML 27 May 2015
Technical article How to get started with current sense amplifiers – part 2 PDF | HTML 26 May 2015
More literature Over-Current Detection Products Brochure 14 Aug 2014

Design & development

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

Evaluation board

INA300EVM — INA300 evaluation module

The INA300 is a high common-mode, precision, bidirectional, current-sensing comparator that can be configured to detect over current conditions through the voltage developed across a shunt resistor.  Operating from a single power supply from 2.7 V to 5.5 V, the INA300 can be configured to (...)

User guide: PDF
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Simulation model

INA300 TINA-TI Reference Design (Rev. A)

SBOM880A.TSC (1606 KB) - TINA-TI Reference Design
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Simulation model

INA300 TINA-TI Spice Model (Rev. A)

SBOM879A.ZIP (9 KB) - TINA-TI Spice 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 (...)

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

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 (...)
User guide: PDF
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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
Reference designs

TIDA-00328 — 50 mA-20 A, Single-Supply, Low-Side or High-Side Current Sensing Solution

This TI Reference Design implements a low-side or high-side wide dynamic range current sensing solution.  Wide dynamic range is achieved by a unique gain switching method.  Switching gain in hardware allows a faster response time than what can typically be achieved with other (...)
Design guide: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
VSSOP (DGS) 10 Ultra Librarian
WSON (DSQ) 10 Ultra Librarian
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