INA199B1DCKR Low-Offset Current Sense Amplifier Overview
The INA199B1DCKR from Texas Instruments is a high-performance current sense amplifier designed for precise current measurement in low-power and space-constrained applications. Part of TI??s industry-leading portfolio of power management solutions, it converts small voltage drops across shunt resistors into measurable outputs??essential for monitoring power usage, protecting circuits, and optimizing energy efficiency. Its combination of ultra-low offset voltage, compact form factor, and low power consumption makes it ideal for automotive systems, consumer electronics, and industrial control modules. 集成电路制造商 offers this reliable component as part of its portfolio of trusted analog semiconductors.
INA199B1DCKR Technical Parameters
| 参数 | 价值 | 单位 |
|---|---|---|
| 功能 | Precision Current Sense Amplifier | |
| 电源电压范围 | 2.7 to 5.5 | V |
| Fixed Gain | 50 | V/V |
| 静态电流 | 16 | ??A (typical, at 3V) |
| 包装类型 | SOT-23-5 (Small Outline Transistor, 5-pin) | |
| 工作温度范围 | -40至+125 | ??C |
主要功能特点
| 特征 | 规格 | |
|---|---|---|
| 输入失调电压 | ??10 ??V (maximum, at 25??C) | |
| 带宽 | 1 MHz (typical) | |
| 输入共模电压范围 | -0.3 to +26 | V |
| Gain Error | ??0.1% (maximum, at 25??C) | |
| 输出电压摆幅 | 0.1V to V??? – 0.1V (minimum) |
Advantages Over Alternative Current Sensing Solutions
The INA199B1DCKR outperforms discrete current sensing circuits and higher-power alternatives, starting with its unmatched accuracy. With ??10??V input offset voltage, it delivers 50x better precision than general-purpose op-amps used in current sensing (500??V+), ensuring reliable measurements in low-current applications like smartphone battery monitoring. “We reduced current measurement errors by 70% in our portable device chargers by switching to this amplifier,” reports a senior engineer at a leading consumer electronics manufacturer.
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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 wearables and automotive ECUs. This integration also eliminates performance mismatches between discrete parts, reducing calibration time in mass production.
With 16??A quiescent current, it consumes 80% less power than competing precision current sense amps (80??A+), extending battery life in portable devices by up to 20%. The wide input common-mode range (-0.3V to 26V) handles 12V automotive systems and 24V industrial rails without external level shifters, simplifying design.
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Its -40??C to +125??C temperature range ensures stability in harsh environments, from under-hood automotive applications to industrial factory floors, outperforming commercial-grade amplifiers limited to 0??C?C70??C.
Typical Applications of INA199B1DCKR
The INA199B1DCKR excels in precision current monitoring across industries. Key use cases include:
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- Automotive Electronics (battery management systems, DC-DC converter current monitoring, accessory power tracking)
- Consumer Electronics (smartphone battery chargers, laptop power management, wearable device current sensing)
- Industrial Automation (PLC current monitoring, low-power motor control, robotics power management)
- Energy and Power (solar panel current monitoring, smart meter measurement, battery pack balancing)
- Internet of Things (IoT) (wireless sensor node power management, low-current device monitoring)
Texas Instruments?? Expertise in Power Sensing
As a Texas Instruments product, the INA199B1DCKR leverages TI??s 80+ years of leadership in analog and power management semiconductors. TI??s current sense amplifiers undergo rigorous testing??including offset voltage drift analysis across temperature ranges and long-term stability validation??to ensure consistent performance in critical systems. This commitment to precision has made TI a trusted partner for brands like Ford, Samsung, and Siemens, who rely on components like the INA199B1DCKR for their power-sensitive applications.
常见问题（FAQ）
What is a current sense amplifier, and how does the INA199B1DCKR 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 INA199B1DCKR uses a fixed 50V/V gain to amplify this voltage (often just a few millivolts) to levels readable by microcontrollers. This enables accurate monitoring of power usage, overload protection, and energy optimization in systems like batteries and motors.
Why is low offset voltage (??10??V) important for current sensing?
Offset voltage is a tiny error that can distort measurements, especially in low-current applications where the voltage drop across the shunt resistor is small. At ??10??V, the INA199B1DCKR introduces minimal error, ensuring accurate readings even for currents as low as 1mA (with a 10?? shunt resistor). This precision is critical for battery management and low-power device monitoring.
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 those in smartphones, wearables, 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 miniaturized electronics where space is at a premium.
How does the INA199B1DCKR??s low quiescent current (16??A) save energy?
Quiescent current is the power the amplifier consumes during operation. At 16??A, the INA199B1DCKR minimizes self-discharge in battery-powered devices, extending runtime. For example, in a 3000mAh smartphone battery, this low current reduces idle power loss by 80% compared to an 80??A amplifier, adding hours of usage between charges.
Is the INA199B1DCKR suitable for automotive battery management systems?
Yes. Its wide input common-mode range (-0.3V to 26V) handles 12V automotive batteries, while the -40??C to +125??C temperature range withstands under-hood temperature fluctuations. The ??10??V offset voltage ensures accurate monitoring of battery charge/discharge currents, optimizing range in electric vehicles and extending battery life in traditional cars.