INA186
40-V, bidirectional, high-precision current sense amplifier with picoamp input bias & ENABLE
INA186
- Wide common-mode voltage range, VCM: –0.2 V to +40 V
- Low input bias currents, IIB: 500 pA (typical) (enables microamp current measurement)
- Low power:
- Low supply voltage, VS: 1.7 V to 5.5 V
- Low quiescent current, IQ: 48 µA (typical)
- Accuracy:
- Common-mode rejection ratio: 120 dB (minimum)
- Gain error, EG: ±1% (maximum)
- Gain drift: 10 ppm/°C (maximum)
- Offset voltage, VOS: ±50 µV (maximum)
- Offset drift: 0.5 µV/°C (maximum)
- Bidirectional current sensing capability
- Gain options:
- INA186A1: 25 V/V
- INA186A2: 50 V/V
- INA186A3: 100 V/V
- INA186A4: 200 V/V
- INA186A5: 500 V/V
The INA186 is a low-power, voltage-output, current-sense amplifier (also called a current-shunt monitor). This device is commonly used for overcurrent protection, precision current measurement for system optimization, or in closed-loop feedback circuits. The INA186 can sense drops across shunts at common-mode voltages from –0.2 V to +40 V, independent of the supply voltage.
The low input bias current of the INA186 permits the use of larger current-sense resistors, thus providing accurate current measurements in the microamp range. The low offset voltage of the zero-drift architecture extends the dynamic range of the current measurement. This feature allows for smaller sense resistors with lower power loss, while still providing accurate current measurements.
The INA186 operates from a single 1.7-V to 5.5-V power supply, and draws a maximum of 90 µA of supply current . Five fixed gain options are available: 25 V/V, 50 V/V, 100 V/V, 200 V/V, or 500 V/V. The device is specified over the operating temperature range of –40°C to +125°C, and offered in SC70, SOT-23-THIN, and DSBGA packages. The SC70 and SOT-23 (DDF) packages support bidirectional current measurement, whereas the DSBGA package only supports current measurement in one direction.
Technical documentation
Type | Title | Date | ||
---|---|---|---|---|
* | Data sheet | INA186 Bidirectional, Low-Power, Zero-Drift, Wide Dynamic Range, Current-Sense Amplifier With Enable datasheet (Rev. B) | PDF | HTML | 30 Jul 2021 |
Application note | Improving Power Amplifier Efficiency With Current Monitors (Rev. B) | PDF | HTML | 24 Jul 2023 | |
Application note | Precision Current Measurements on High-Voltage Power-Supply Rails (Rev. F) | PDF | HTML | 17 Oct 2022 | |
Application note | Using a PCB Copper Trace as a Current-Sense Shunt Resistor | PDF | HTML | 25 Jan 2022 | |
Circuit design | Low-Drift, Low-Side, Bidirectional Current Sensing Circuit (Rev. A) | PDF | HTML | 02 Dec 2020 | |
Application note | Difference Between an Instrumentation Amplifier and a Current Sense Amplifier | 03 Apr 2020 | ||
EVM User's guide | INA186EVM User's Guide | 10 Apr 2019 | ||
Application note | External current sense amps vs integrated onboard amplifiers for current sensing (Rev. B) | 19 Feb 2019 | ||
Circuit design | Low (microamp), high-side, current-sensing circuit with current-sensing amp | 08 Jan 2019 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
INA186EVM — INA186 evaluation module
INA186 TINA-TI Reference Design (Rev. A)
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 |
---|---|---|
DSBGA (YFD) | 6 | View options |
SOT-23-THN (DDF) | 8 | View options |
SOT-SC70 (DCK) | 6 | View options |
Ordering & quality
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