Overview
The INA216A4RSWR from Texas Instruments is a high-precision, low-power current shunt monitor. It is part of the INA216 series, which features a Zerø-Drift architecture, enabling accurate current sensing with minimal voltage drops across the shunt. This device operates from a single power supply ranging from +1.8V to +5.5V and draws a maximum of 25μA of supply current. The INA216A4RSWR is particularly useful in applications requiring high gain and low offset voltage, making it suitable for a variety of current sensing tasks.
Key Specifications
| Parameter | Condition | Min | Max | Unit | |
|---|---|---|---|---|---|
| Supply Voltage | +7 | V | |||
| Differential Input Voltage (VIN+ - VIN-) | -5.5 | +5.5 | V | ||
| Common-Mode Input Range | 1.8 | 5.5 | V | ||
| Gain (INA216A4) | 200 | 200 | V/V | ||
| Gain Error | VOUT = 0.2V to VOUT = 2.5V | ±0.01 | ±0.2 | % | |
| Offset Voltage, RTI | ±20 | ±75 | μV | ||
| Common-Mode Rejection Ratio (CMRR) | VIN+ = +1.8V to +5.5V | 90 | 108 | dB | |
| Power-Supply Rejection Ratio (PSRR) | VIN+ = +1.8V to +5.5V | 90 | 108 | dB | |
| Quiescent Current | 13 | 25 | μA | ||
| Operating Temperature Range | -40 | +125 | °C | ||
| Bandwidth (CLOAD = 10pF) | 2.5 | 2.5 | kHz |
Key Features
- Zerø-Drift Architecture: Enables accurate current sensing with minimal voltage drops across the shunt, as low as 10mV full-scale.
- High Gain Options: Available in gains of 25V/V, 50V/V, 100V/V, and 200V/V, allowing for wide dynamic ranges.
- Low Offset Voltage: Offset voltages as low as ±20μV, reducing measurement error.
- Low Quiescent Current: Maximum of 25μA, making it suitable for low-power applications.
- Wide Common-Mode Range: Operates with common-mode voltages from +1.8V to +5.5V.
- High CMRR and PSRR: Common-Mode Rejection Ratio and Power-Supply Rejection Ratio of up to 108dB.
- Buffered Voltage Output: No additional op-amp is needed for voltage output.
- Compact Package: Available in chip-scale packages such as ThinQFN-10 and WCSP-4.
Applications
- Notebook Computers: For current sensing in power management systems.
- Cell Phones: In battery charging and power management circuits.
- Telecom Equipment: For monitoring current in various telecom applications.
- Power Management: In DC-DC converters and other power management systems.
- Battery Chargers: For accurate current sensing during charging cycles.
Q & A
- What is the operating voltage range of the INA216A4RSWR?
The INA216A4RSWR operates from a single power supply ranging from +1.8V to +5.5V.
- What are the available gain options for the INA216 series?
The INA216 series is available in gains of 25V/V, 50V/V, 100V/V, and 200V/V.
- What is the typical quiescent current of the INA216A4RSWR?
The typical quiescent current is 13μA, with a maximum of 25μA.
- What is the common-mode input range of the INA216A4RSWR?
The common-mode input range is from +1.8V to +5.5V.
- What is the bandwidth of the INA216A4RSWR with a 10pF load capacitance?
The bandwidth is 2.5 kHz with a 10pF load capacitance.
- How does the INA216A4RSWR handle high gain and low offset voltage?
The Zerø-Drift architecture ensures accurate current sensing with minimal voltage drops and low offset voltages, reducing measurement error.
- What are some common applications of the INA216A4RSWR?
Common applications include notebook computers, cell phones, telecom equipment, power management systems, and battery chargers.
- What is the maximum operating temperature of the INA216A4RSWR?
The specified temperature range is from –40°C to +125°C.
- How does the INA216A4RSWR handle transients above 5.5V?
With additional circuitry using zener diodes or zener-type transient absorbers, the INA216A4RSWR can handle transients above 5.5V.
- What is the typical output impedance of the INA216A4RSWR?
The output impedance is typically 42Ω.
