Overview
The INA199B1DCKR from Texas Instruments is a 26-V, bidirectional, zero-drift, voltage-output current-shunt monitor. This device is designed to accurately measure voltages developed across a current-sensing resistor and can be used in both low-side and high-side configurations. It features a wide common-mode range of –0.3 V to 26 V and is 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 temperature drift of 0.5 μV/°C over the full temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Supply Voltage | 2.7 | - | 26 | V |
| Common-Mode Input Voltage | GND – 0.3 | - | 26 | V |
| Offset Voltage | - | - | ±150 μV | μV |
| Gain Error (Maximum Over Temperature) | - | - | ±1% (C Version), ±1.5% (A and B Versions) | % |
| Gain Options | - | - | 50 V/V, 100 V/V, 200 V/V | V/V |
| Quiescent Current | - | - | 100 μA | μA |
| Operating Temperature | -40 | - | 125 | °C |
| Bandwidth (CLOAD = 10 pF) | - | - | 80 kHz (INA199x1), 30 kHz (INA199x2), 14 kHz (INA199x3) | kHz |
| Slew Rate | - | - | 0.4 V/μs | V/μs |
| Voltage Noise Density | - | - | 25 nV/√Hz | nV/√Hz |
Key Features
- Wide Common-Mode Range: –0.3 V to 26 V, allowing for measurements on high-voltage rails.
- Zero-Drift Topology: Ensures high-precision measurements with a maximum input offset voltage of ±150 μV and a temperature drift of 0.5 μV/°C.
- Choice of Gains: Available in gains of 50 V/V, 100 V/V, and 200 V/V to accommodate various shunt resistor values.
- Low Quiescent Current: Maximum quiescent current of 100 μA, suitable for power-sensitive applications.
- High Accuracy: Gain error of ±1% (C Version) and ±1.5% (A and B Versions) over the full temperature range.
- Compact Packages: Available in 6-Pin SC70 and 10-Pin UQFN packages.
Applications
- Notebook Computers: For precise current monitoring and overcurrent protection.
- Cell Phones: To manage power consumption and battery charging.
- Qi-Compliant Wireless Charging Transmitters: For accurate current sensing in wireless charging applications.
- Telecom Equipment: For monitoring and managing power distribution.
- Power Management: In various power management systems requiring precise current measurement.
- Battery Chargers: To ensure safe and efficient battery charging.
Q & A
- What is the common-mode input voltage range of the INA199B1DCKR?
The common-mode input voltage range is from GND – 0.3 V to 26 V.
- 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 maximum quiescent current of the INA199B1DCKR?
The maximum quiescent current is 100 μA.
- What is the operating temperature range of the INA199B1DCKR?
The operating temperature range is from –40°C to 125°C.
- How does the zero-drift topology benefit the INA199 series?
The zero-drift topology ensures high-precision measurements with a low input offset voltage and minimal temperature drift.
- What are the typical applications of the INA199B1DCKR?
Typical applications include notebook computers, cell phones, Qi-compliant wireless charging transmitters, telecom equipment, power management, and battery chargers.
- What is the bandwidth of the INA199B1DCKR for different gain versions?
The bandwidth is 80 kHz for INA199x1, 30 kHz for INA199x2, and 14 kHz for INA199x3 with a CLOAD of 10 pF.
- How should the input pins be connected to the shunt resistor?
The input pins should be connected as close as possible to the shunt resistor using a kelvin or 4-wire connection to minimize additional resistance.
- What is the recommended power-supply bypass capacitor value?
A bypass capacitor with a value of 0.1 μF is recommended, placed close to the supply and ground pins.
- Can the INA199B1DCKR handle common-mode transients above 26 V?
Yes, with additional circuitry using Zener diodes or Zener-type transient absorbers, the INA199 series can handle transients above 26 V.
