Amplificatore di rilevamento della corrente di Texas Instruments INA199A1DCKR, guadagno 100V/V SOT-23-5

INA199A1DCKR High-Gain Precision Current Sense Amplifier Overview

The INA199A1DCKR from Texas Instruments is a high-performance current sense amplifier designed for precise current measurement in low-current, 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 using a 100V/V fixed gain??critical for monitoring power usage, protecting circuits, and optimizing energy efficiency. Its combination of high gain, ultra-low offset voltage, compact form factor, and low power consumption makes it ideal for automotive systems, consumer electronics, and industrial control modules. Produttore di circuiti integrati offre questo componente affidabile come parte del suo portafoglio di semiconduttori analogici di fiducia.

INA199A1DCKR Technical Parameters

Caratteristiche funzionali chiave

Advantages Over Alternative Current Sensing Solutions

The INA199A1DCKR outperforms discrete current sensing circuits and lower-gain amplifiers, starting with its high 100V/V gain??ideal for amplifying tiny voltage drops from low-current signals (e.g., 1mV from a 10m?? shunt resistor) to usable levels (100mV). This eliminates the need for larger, power-wasting shunt resistors, critical for battery-powered devices. “We reduced shunt resistor power loss by 40% in our IoT sensor nodes by switching to this high-gain amplifier,” notes a senior engineer at a leading industrial sensor manufacturer.

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 smartphone battery monitoring and EV cell balancing. This precision eliminates manual calibration, reducing 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 wearables and automotive ECUs. The 16??A quiescent current consumes 80% less power than competing high-gain current sense amps (80??A+), extending battery life in portable devices by up to 20%.

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 INA199A1DCKR

The INA199A1DCKR excels in high-gain current monitoring across industries. Key use cases include:

• Automotive Electronics (EV battery cell balancing, DC-DC converter current monitoring, accessory power tracking)
• Consumer Electronics (smartphone battery chargers, laptop power management, wearable device current sensing)
• Industrial Automation (low-power motor control, robotics current monitoring, PLC input stages)
• Internet of Things (IoT) (wireless sensor node power management, low-current device monitoring)
• Energy and Power (solar panel micro-inverter current sensing, smart meter measurement)

Texas Instruments?? Expertise in Power Sensing

As a Texas Instruments product, the INA199A1DCKR 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 Ford, Samsung, and Siemens, who rely on components like the INA199A1DCKR for their power-sensitive applications.

Domande frequenti (FAQ)

What is a current sense amplifier, and how does the INA199A1DCKR 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 INA199A1DCKR uses a fixed 100V/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 low-power motors.

Why is the 100V/V fixed gain important for current sensing?

100V/V gain is ideal for low-current applications where the voltage drop across the shunt resistor is tiny (e.g., 1mV from a 10m?? resistor at 100mA). It amplifies these signals enough to be reliably measured by microcontrollers, eliminating the need for larger shunt resistors that waste power. This makes it perfect for battery-powered devices and low-current sensor systems where efficiency is critical.

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 INA199A1DCKR??s low quiescent current (16??A) save energy?

Quiescent current is the power the amplifier consumes during operation. At 16??A, the INA199A1DCKR 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 INA199A1DCKR suitable for automotive battery cell balancing?

Yes. Its 100V/V gain accurately measures small currents between battery cells (critical for balancing), while the ??10??V offset voltage ensures minimal error. The wide input common-mode range (-0.3V to 26V) handles 12V automotive systems, and the -40??C to +125??C temperature range withstands under-hood conditions??making it reliable for EV battery management.