INA381-Q1
AEC-Q100, 26-V, 350-kHz current sense amplifier with integrated overcurrent comparator
INA381-Q1
- Qualified for Automotive Applications
- AEC-Q100 Qualified With the Following Results:
- Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature
- Functional Safety-Capable
- Common-mode input range: –0.2 V to +26 V
- High accuracy amplifier:
- Offset voltage at TA = 25°C
- 500 µV (maximum) at VCM = 12 V
- 150 µV (maximum) at VCM = 0 V
- Offset voltage drift: 1 µV/°C (maximum)
- Gain error: 1% (maximum) at 25°C
- Gain error drift: 20 ppm/°C (maximum)
- Offset voltage at TA = 25°C
- Available amplifier gains:
- INA381A1-Q1: 20 V/V
- INA381A2-Q1: 50 V/V
- INA381A3-Q1: 100 V/V
- INA381A4-Q1: 200 V/V
- Open-drain comparator:
- Hysteresis: 50 mV
- Propagation delay: 400 ns (typical)
- Alert threshold set through external reference voltage
- Supports transparent and latching modes
- Package: VSSOP-10
The INA381-Q1 includes both a 26-V common-mode, current-sensing amplifier and a high-speed comparator. This device detects overcurrent conditions by measuring the voltage developed across a current-shunt resistor and comparing that voltage to a user-defined threshold limit set by the comparator reference pin. The current-shunt monitor can measure differential voltage signals on common-mode voltages that vary from –0.2 V up to 26 V, independent of the supply voltage.
The open-drain alert output can be configured to operate in two modes: transparent or latched. In transparent mode, the output status follows the input state. In latched mode, the alert output is cleared only when the latch is reset. The standalone comparator large-signal alert response time is less than 2 µs, allowing for quick detection of overcurrent events. The total system overcurrent protection response time provided by the INA381-Q1 is less than 10 µs.
This device operates from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 350 µA. The device is specified over an operating temperature range of –40°C to +125°C, and is available in the 10-pin VSSOP package.
Technical documentation
Type | Title | Date | ||
---|---|---|---|---|
* | Data sheet | INA381-Q1 AEC-Q100, 26-V, 350-kHz Current Sense Amplifier With Integrated Overcurrent Comparator datasheet (Rev. A) | PDF | HTML | 23 Mar 2021 |
Application note | 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 note | Measuring Current for Handle Multiple Out-of-Range Conditions (Rev. C) | PDF | HTML | 04 Oct 2021 | |
Functional safety information | INA381-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA (Rev. A) | PDF | HTML | 23 Oct 2020 | |
Application note | 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 note | Low-Drift, Low-Side Current Measurements for Three-Phase Systems (Rev. B) | 05 Sep 2017 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
INA381EVM — INA381 Current Sense Amplifier With Integrated Over-Current Comparator Evaluation Module
CIRCUIT060035 — Bidirectional current sensing with a window comparator circuit
CIRCUIT060037 — Precision over-current latch circuit
PSPICE-FOR-TI — PSpice® for TI design and simulation tool
TINA-TI — SPICE-based analog simulation program
TIDA-00302 — Current Shunt Monitor with Transient Robustness Reference Design
Additionally, an external protection circuit is implemented to provide surge and fast-transient protection and demonstrate the different immunity levels to (...)
Package | Pins | Download |
---|---|---|
VSSOP (DGS) | 10 | View options |
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