Overview
The INA199A2DCKR, produced by Texas Instruments, is a 26-V common-mode, zero-drift topology, current-sensing amplifier. This device is designed to accurately measure voltages developed across a current-sensing resistor in both low-side and high-side configurations. It can measure current on input voltage rails as high as 26 V and can be powered from supply voltages as low as 2.7 V. The zero-drift topology ensures high-precision measurements with a maximum input offset voltage of ±150 μV and a maximum temperature contribution of 0.5 μV/°C over the full temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 2.7 to 26 | V |
| Common-Mode Range | GND – 0.3 to 26 | V |
| Offset Voltage | ±150 μV (Maximum) | μV |
| Gain Error (Maximum Over Temperature) | ±1.5% (A and B Versions), ±1% (C Version) | % |
| Gain | 100 V/V (INA199A2) | V/V |
| Quiescent Current | 100 μA (Maximum) | μA |
| Bandwidth | 30 kHz (CLOAD = 10 pF) | kHz |
| Slew Rate | 0.4 V/μs | V/μs |
| Operating Temperature Range | –40 to 125 | °C |
| Package | 6-Pin SC70 (DCKR) |
Key Features
- Wide Common-Mode Range: –0.3 V to 26 V, allowing for high-voltage current measurement.
- Zero-Drift Topology: Ensures high-precision measurements with a maximum input offset voltage of ±150 μV and a maximum temperature contribution of 0.5 μV/°C.
- Low Offset Voltage: Enables shunt drops as low as 10 mV full-scale, reducing shunt dissipation significantly.
- Choice of Gains: Available in gains of 50 V/V, 100 V/V, and 200 V/V, allowing for flexibility in different applications.
- Low Quiescent Current: Maximum of 100 μA, making it suitable for power-sensitive designs.
- Compact Packages: Available in 6-Pin SC70 and 10-Pin UQFN packages, suitable for space-constrained applications).
Applications
- Notebook Computers: For precise current measurement and overcurrent protection).
- Cell Phones: To manage power efficiently and protect against overcurrent conditions).
- Qi-Compliant Wireless Charging Transmitters: For accurate current sensing in wireless charging applications).
- Telecom Equipment: To ensure reliable and precise current measurement in telecommunications systems).
- Power Management and Battery Chargers: For optimizing system performance and ensuring safe charging operations).
Q & A
- What is the maximum common-mode voltage range for the INA199A2DCKR?
The maximum common-mode voltage range is from GND – 0.3 V to 26 V).
- What is the offset voltage of the INA199A2DCKR?
The maximum input offset voltage is ±150 μV).
- What are the available gain options for the INA199 series?
The INA199 series is available in gains of 50 V/V, 100 V/V, and 200 V/V).
- What is the quiescent current of the INA199A2DCKR?
The maximum quiescent current is 100 μA).
- What are the typical applications of the INA199A2DCKR?
Typical applications include notebook computers, cell phones, Qi-compliant wireless charging transmitters, telecom equipment, and power management systems).
- What is the operating temperature range of the INA199A2DCKR?
The operating temperature range is from –40°C to 125°C).
- What package options are available for the INA199A2DCKR?
The INA199A2DCKR is available in a 6-Pin SC70 package).
- How does the zero-drift topology benefit the INA199A2DCKR?
The zero-drift topology ensures high-precision measurements with minimal temperature drift, allowing for accurate current sensing over a wide temperature range).
- What is the bandwidth of the INA199A2DCKR?
The bandwidth is 30 kHz for a load capacitance of 10 pF).
- What is the slew rate of the INA199A2DCKR?
The slew rate is 0.4 V/μs).
