INA190
40-V, bidirectional, ultraprecise current sense amplifier with picoamp IB & ENABLE
INA190
- Low input bias currents: 500 pA (typ)
(enables microamp current measurement) - Low power:
- Low supply voltage, VS: 1.7 V to 5.5 V
- Low shutdown current: 100 nA (max)
- Low quiescent current: 50 µA at 25°C (typ)
- Accuracy:
- Common-mode rejection ratio: 132 dB (min)
- Gain error: ±0.2% (A1 device)
- Gain drift: 7 ppm/°C (max)
- Offset voltage, VOS: ±15 µV (max)
- Offset drift: 80 nV/°C (max)
- Wide common-mode voltage: –0.2 V to +40 V
- Bidirectional current sensing capability
- Gain options:
- INA190A1: 25 V/V
- INA190A2: 50 V/V
- INA190A3: 100 V/V
- INA190A4: 200 V/V
- INA190A5: 500 V/V
The INA190 is a low-power, voltage-output, current-shunt monitor (also called a current-sense amplifier). This device is commonly used for overcurrent protection, precision current measurement for system optimization, or in closed-loop feedback circuits. The INA190 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 device 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 INA190 operates from a single 1.7-V to 5.5-V power supply, and draws a maximum of 65 µA of supply current when enabled; only 0.1 µA when disabled. 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 UQFN, SC70, and SOT-23 packages.
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Technical documentation
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
INA190EVM — INA190 current sensing evaluation module with low current layout
INA190 TINA-TI Reference Design (Rev. B)
CIRCUIT060035 — Bidirectional current sensing with a window comparator circuit
CIRCUIT060037 — Precision over-current latch circuit
CIRCUIT060039 — Low (microamp), high-side, current-sensing circuit with current-sensing amplifier
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 |
---|---|---|
SOT-23-THN (DDF) | 8 | View options |
SOT-SC70 (DCK) | 6 | View options |
UQFN (RSW) | 10 | View options |
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