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Current sense amplifiers analog output

INA301-Q1

ACTIVE

AEC-Q100, 36V, 550kHz, 4V/µs, high-precision current sense amplifier w/ comparator

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Data sheet

INA301-Q1

ACTIVE
Data sheet Order now

Product details

Common mode voltage (Max) (V) 36 Common mode voltage (Min) (V) 0 Input offset (+/-) (Max) (uV) 35, 50, 125 Input offset drift (+/-) (Typ) (uV/C) 0.1 Gain (V/V) 100, 20, 50 Gain error (%) 0.1, 0.15, 0.2 Gain error drift (+/-) (Max) (ppm/°C) 10 CMRR (Min) (dB) 100 Bandwidth (kHz) 550, 500, 450 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 0.7 Number of channels (#) 1 Comparators (#) 1 Features Alert Function, High precision, Low-side Capable Rating Automotive TI functional safety category Functional Safety-Capable Operating temperature range (C) -40 to 125
Common mode voltage (Max) (V) 36 Common mode voltage (Min) (V) 0 Input offset (+/-) (Max) (uV) 35, 50, 125 Input offset drift (+/-) (Typ) (uV/C) 0.1 Gain (V/V) 100, 20, 50 Gain error (%) 0.1, 0.15, 0.2 Gain error drift (+/-) (Max) (ppm/°C) 10 CMRR (Min) (dB) 100 Bandwidth (kHz) 550, 500, 450 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 0.7 Number of channels (#) 1 Comparators (#) 1 Features Alert Function, High precision, Low-side Capable Rating Automotive TI functional safety category Functional Safety-Capable Operating temperature range (C) -40 to 125
VSSOP (DGK) 8 15 mm² 3 x 4.9
  • Qualified for automotive applications
  • AEC-Q100 qualified with the following results:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C6
  • Functional Safety-Capable
  • Wide common-mode input range: 0 V to 36 V
  • Dual output: amplifier and comparator output
  • High accuracy amplifier:
    • Offset voltage: 35 µV (maximum)
    • Offset voltage drift: 0.5 µV/°C (maximum)
    • Gain error: 0.1% (maximum)
    • Gain error drift: 10 ppm/°C
  • Available amplifier gains:
    • INA301A1-Q1: 20 V/V
    • INA301A2-Q1: 50 V/V
    • INA301A3-Q1: 100 V/V
  • Programmable alert threshold set through a single resistor
  • Total alert response time: 1 µs
  • Open-drain output with both transparent and latching modes
  • Package: VSSOP-8
  • Qualified for automotive applications
  • AEC-Q100 qualified with the following results:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C6
  • Functional Safety-Capable
  • Wide common-mode input range: 0 V to 36 V
  • Dual output: amplifier and comparator output
  • High accuracy amplifier:
    • Offset voltage: 35 µV (maximum)
    • Offset voltage drift: 0.5 µV/°C (maximum)
    • Gain error: 0.1% (maximum)
    • Gain error drift: 10 ppm/°C
  • Available amplifier gains:
    • INA301A1-Q1: 20 V/V
    • INA301A2-Q1: 50 V/V
    • INA301A3-Q1: 100 V/V
  • Programmable alert threshold set through a single resistor
  • Total alert response time: 1 µs
  • Open-drain output with both transparent and latching modes
  • Package: VSSOP-8

The INA301-Q1 includes both a high common-mode, current-sensing amplifier and a high-speed comparator configured to provide overcurrent protection by measuring the voltage developed across a current-sensing or current-shunt resistor and comparing that voltage to a defined threshold limit. This device features an adjustable limit-threshold range that is set using a single external limit-setting resistor. This current-shunt monitor measures 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 of –40°C to +125°C, and is available in an 8-pin VSSOP package.

The INA301-Q1 includes both a high common-mode, current-sensing amplifier and a high-speed comparator configured to provide overcurrent protection by measuring the voltage developed across a current-sensing or current-shunt resistor and comparing that voltage to a defined threshold limit. This device features an adjustable limit-threshold range that is set using a single external limit-setting resistor. This current-shunt monitor measures 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 of –40°C to +125°C, and is available in an 8-pin VSSOP package.
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Same functionality with different pin-out to the compared device.
INA381-Q1 ACTIVE AEC-Q100, 26-V, 350-kHz current sense amplifier with integrated overcurrent comparator The INA381-Q1 has similar functionality with lower perfomance at a lower price
Similar functionality to the compared device.
INA300-Q1 ACTIVE AEC-Q100, 36V current sense comparator The INA300-Q1 offers only an ALERT signal
INA302-Q1 ACTIVE AEC-Q100, 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amp w/ dual comparators The INA302-Q1 has dual integrated comparators
INA303-Q1 ACTIVE AEC-Q100, 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amp w/ window comparator The INA303-Q1 has window comparotor functionality

Technical documentation

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Type Title Date
* Data sheet INA301-Q1 36-V, Automotive, High-Speed, Zero-Drift, Voltage-Output Current-Shunt Monitor With High-Speed, Overcurrent Protection Comparator datasheet (Rev. B) PDF | HTML 01 Apr 2022
Application note Precision Current Measurements on High-Voltage Power-Supply Rails (Rev. E) PDF | HTML 30 Mar 2022
Application note Measuring Current To Detect Out-of-Range Conditions (Rev. D) PDF | HTML 10 Mar 2022
Application note Integrating the Current Sensing Resistor (Rev. C) PDF | HTML 09 Mar 2022
Application note Using a PCB Copper Trace as a Current-Sense Shunt Resistor PDF | HTML 25 Jan 2022
Functional safety information INA301-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 11 Oct 2021
Application note Measuring Current for Handle Multiple Out-of-Range Conditions (Rev. C) PDF | HTML 04 Oct 2021
Application note Integrating the Current Sensing Signal Path (Rev. B) PDF | HTML 29 Sep 2021
Selection guide Current Sense Amplifiers (Rev. E) 20 Sep 2021
Technical article Solving the multidecade current-measurement challenge in your 48-V BMS application 14 Jun 2021
Application note High-Side Motor Current Monitoring for Over-Current Protection (Rev. B) PDF | HTML 23 Feb 2021
Technical article How current-sense amplifiers monitor satellite health 08 Feb 2021
Technical article Use fast, precise overcurrent detection to enable diagnostics in automotive safety systems 24 Jun 2019
Application note Bidirectional, Low-Side Phase Current Sensing With Onboard Overcurrent Detection (Rev. D) 06 Mar 2019
Application note 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 temperature 04 Oct 2018
Circuit design Overcurrent event detection circuit 31 Jul 2018
Application note 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
EVM User's guide INA301EVM User Guide 18 Nov 2015

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.

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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

INA301 PSpice Model

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

INA301A2 PSpice Model

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

INA301A1 PSpice Model

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

INA301A3 PSpice Model

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

Current Sense Amplifier Comparison and Error Tool (Rev. E)

SBOR020E.ZIP (592 KB)
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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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Reference designs

TIDA-01543 — Isolated Current Sense Reference Design (±300 A) for Traction Inverter With Overcurrent Detection

This reference design provides detection of traction motor phase currents. TIDA-01543 realizes an isolated current sensor. Precise in-line huntbased, motor phase current sensing is done with AMC1305M05-Q1 delta-sigma (ΔΣ) modulators and the INA301-Q1 device. The high CMTI of the (...)
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 (...)

Schematic: PDF
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