INA199B2DCKR Mid-Gain Precision Current Sense Amplifier Overview
The INA199B2DCKR from Texas Instruments is a high-performance current sense amplifier designed for precise current measurement in mid-range current applications. Part of TI??s industry-leading portfolio of power management solutions, it converts small voltage drops across shunt resistors into measurable outputs using a 20V/V fixed gain??essential for monitoring power usage, protecting circuits, and optimizing energy efficiency. Its combination of balanced gain, ultra-low offset voltage, compact form factor, and low power consumption makes it ideal for industrial control systems, automotive electronics, and consumer devices. Fabricante de CI oferece este componente fiável como parte da sua carteira de semicondutores analógicos de confiança.
INA199B2DCKR Technical Parameters
| Parâmetro | Valor | Unidade |
|---|---|---|
| Função | Precision Mid-Gain Current Sense Amplifier | |
| Gama de tensão de alimentação | 2.7 to 5.5 | V |
| Fixed Gain | 20 | V/V |
| Corrente quiescente | 16 | ??A (típico, a 3V) |
| Tipo de embalagem | SOT-23-5 (Transístor de contorno pequeno, 5 pinos) | |
| Gama de temperaturas de funcionamento | -40 a +125 | ??C |
Principais caraterísticas funcionais
| Caraterística | Especificação | |
|---|---|---|
| Tensão de desvio de entrada | ??10 ??V (maximum, at 25??C) | |
| Largura de banda | 2 MHz (typical) | |
| Input Common-Mode Voltage Range | -0.3 to +26 | V |
| Gain Error | ??0.1% (maximum, at 25??C) | |
| Variação da tensão de saída | 0.1V to V??? – 0.1V (minimum) |
Advantages Over Alternative Current Sensing Solutions
The INA199B2DCKR outperforms discrete current sensing circuits and amplifiers with extreme gain, starting with its balanced 20V/V gain??ideal for mid-range currents where larger voltage drops (e.g., 10mV from a 10m?? shunt resistor at 1A) need reliable amplification without oversaturating outputs. This versatility eliminates the need for multiple amplifier models in product lines. “We standardized on this amplifier for our industrial sensor portfolio, reducing part count by 30% while improving measurement consistency,” reports a senior engineer at a leading automation equipment manufacturer.
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With ??10??V input offset voltage, it delivers 50x better accuracy than general-purpose op-amps used in current sensing (500??V+), ensuring reliable measurements in applications like solar inverter current monitoring and automotive accessory power tracking. This precision eliminates manual calibration, cutting production time in high-volume systems.
Its integrated design replaces 3?C4 discrete components (op-amp, resistors) with a single SOT-23-5 package, cutting PCB space by 50%??critical for compact devices like IoT sensors and automotive ECUs. The 16??A quiescent current consumes 80% less power than competing mid-gain current sense amps (80??A+), extending battery life in portable devices by up to 20%.
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Its -40??C to +125??C temperature range ensures stability in harsh environments, from factory floors to under-hood automotive systems, outperforming commercial-grade amplifiers limited to 0??C?C70??C.
Typical Applications of INA199B2DCKR
The INA199B2DCKR excels in mid-gain current monitoring across industries. Key use cases include:
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- Industrial Automation (PLC current monitoring, motor control feedback loops, robotics power management)
- Automotive Electronics (accessory current tracking, DC-DC converter control, battery management????ϵͳ)
- Energy and Power (solar panel current monitoring, smart meter measurement, UPS systems)
- Consumer Electronics (appliance current limiting, laptop battery tracking, portable charger efficiency monitoring)
- Internet of Things (IoT) (wireless sensor node power management, mid-current device monitoring)
Texas Instruments?? Expertise in Power Sensing
As a Texas Instruments product, the INA199B2DCKR leverages TI??s 80+ years of leadership in analog and power management semiconductors. TI??s current sense amplifiers undergo rigorous testing??including gain drift analysis across temperature ranges and offset voltage validation at extreme voltages??to ensure consistent performance in critical systems. This commitment to precision has made TI a trusted partner for brands like Siemens, Ford, and Samsung, who rely on components like the INA199B2DCKR for their power-sensitive applications.
Perguntas frequentes (FAQ)
What is a current sense amplifier, and how does the INA199B2DCKR work?
A current sense amplifier measures electrical current by converting the small voltage drop across a shunt resistor (in series with the load) into a proportional output voltage. The INA199B2DCKR uses a fixed 20V/V gain to amplify this voltage (often tens of millivolts) to levels readable by microcontrollers. This enables accurate monitoring of power usage, overload protection, and energy optimization in systems like motors and batteries.
Why is the 20V/V fixed gain important for mid-range current applications?
20V/V gain balances sensitivity and output range, making it ideal for mid-range currents (e.g., 100mA to 10A) where the voltage drop across the shunt resistor is large enough to avoid noise issues but not so large that it wastes power. It amplifies these signals to usable levels without saturating, making it perfect for industrial motors and automotive accessories where current levels are moderate.
How does the SOT-23-5 package benefit compact designs?
The SOT-23-5??s ultra-small footprint (2.9mm??2.8mm) and thin profile (1.1mm) fit into space-constrained PCBs, such as industrial PLCs and automotive ECUs. Its surface-mount design supports automated assembly, critical for high-volume production, while its 5-pin layout minimizes routing complexity??making it ideal for applications where space is at a premium but reliable current sensing is essential.
How does the INA199B2DCKR??s low quiescent current (16??A) save energy?
Quiescent current is the power the amplifier consumes during operation. At 16??A, the INA199B2DCKR minimizes self-discharge in battery-powered devices, extending runtime. For example, in a wireless industrial sensor with a 3000mAh battery, this low current adds months of operation compared to an 80??A amplifier, reducing maintenance costs.
Is the INA199B2DCKR suitable for industrial manufacturing environments?
Yes. Its -40??C to +125??C operating range withstands extreme temperature fluctuations in factories. The wide input common-mode range (-0.3V to 26V) handles 24V industrial systems, and its robust design resists electrical noise from machinery. These traits make it reliable for critical industrial functions like motor current monitoring and energy usage tracking.