Overview
The INA216A3RSWT from Texas Instruments is a high-side voltage output current shunt monitor, part of the Zerø-Drift series. This device is designed to sense drops across shunts at common-mode voltages ranging from +1.8V to +5.5V. It features a low offset voltage and high gain accuracy, making it suitable for precise current sensing applications. The INA216A3RSWT operates from a single power supply, drawing a maximum of 25μA of supply current, and is specified over a temperature range of –40°C to +125°C. It is available in a chip-scale package, enhancing its suitability for compact and low-power designs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | +1.8 to +5.5 | V |
| Common-Mode Input Range | +1.8 to +5.5 | V |
| Offset Voltage (RTI) | ±20 | μV |
| Gain | 100 | V/V |
| Gain Error | ±0.2% | % |
| Quiescent Current | 13 to 25 | μA |
| Operating Temperature Range | –40 to +125 | °C |
| Bandwidth (CLOAD = 10pF) | 5 | kHz |
| Output Impedance | 42 | Ω |
| Maximum Capacitive Load | 750 | pF |
Key Features
- Low Offset Voltage: ±20μV, enabling precise current sensing with minimal error.
- High Gain Accuracy: Gain error of ±0.2% ensures reliable and accurate measurements.
- Wide Common-Mode Range: Operates from +1.8V to +5.5V, making it versatile for various applications.
- Low Power Consumption: Quiescent current of 13μA to 25μA, suitable for low-power designs.
- Buffered Voltage Output: No additional op-amp is needed, simplifying the circuit design.
- Compact Package: Available in a chip-scale package, ideal for space-constrained applications.
Applications
- Notebook Computers: For power management and battery monitoring.
- Cell Phones: For battery charging and power management.
- Telecom Equipment: For current sensing in power supplies and battery management systems.
- Power Management: For monitoring and controlling current in various power management circuits.
- Battery Chargers: For precise current sensing during charging cycles.
Q & A
- What is the common-mode input range of the INA216A3RSWT?
The common-mode input range is from +1.8V to +5.5V.
- What is the gain of the INA216A3RSWT?
The gain of the INA216A3RSWT is 100 V/V.
- What is the quiescent current of the INA216A3RSWT?
The quiescent current is 13μA to 25μA.
- What is the operating temperature range of the INA216A3RSWT?
The operating temperature range is from –40°C to +125°C.
- How is the power supply connected to the INA216A3RSWT?
The power supply is derived from the IN+ pin, with no dedicated power-supply pin.
- What is the maximum capacitive load for the INA216A3RSWT?
The maximum capacitive load is 750 pF.
- What are the typical applications of the INA216A3RSWT?
Typical applications include notebook computers, cell phones, telecom equipment, power management, and battery chargers.
- How does the INA216A3RSWT handle transients above 5.5V?
It can handle transients above 5.5V with additional circuitry using zener diode or zener-type transient absorbers.
- What is the output impedance of the INA216A3RSWT?
The output impedance is 42 Ω.
- What is the bandwidth of the INA216A3RSWT with a 10pF load?
The bandwidth is 5 kHz.
