REF194GSZ

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PMIC (Power Management Integrated Circuit) voltage references are popular in various applications especially industrial and automotive requirements. REF194GSZ, a voltage reference device introduced by Texas Instruments, is a 5V reference with a low-power, 3-lead/supply-voltage-controlled voltage reference. This device ensures high accuracy, excellent temperature stability, fast response and low temperature drift to provide superior performance.

The REF194GSZ features a low input voltage range from 2.7V to 5.5V and its output voltage range is adjustable from 1.3V to 4.7V, within ±0.5% max accuracy. Therefor, the device is suitable for high accuracy applications such as motor control systems or over-current protection circuit in automobiles. It also has a very low temperature drift of ±1ppm/°C, meaning it is able to maintain accuracy even in fluctuating temperatures.

The REF194GSZ has a low power supply current and fast settling time of 25μs. This low-power feature makes it suitable for battery-operated portable devices, while its fast response time improves the stability of the power supply during fast load transitions. Additionally, with its high output current handling capability up to 50mA, the REF194GSZ is suitable for driving multiple loads in series. It is also short-circuit protected, providing a layer of safety against accidental short circuits.

The REF194GSZ features a unique 3-lead operating scheme. Instead of the traditional two-terminal difference between the reference and ground, the REF194GSZ uses a three-terminal input voltage and ground connection. The input voltage connection allows the reference voltage to be adjusted by a logic or voltage signal. This leads to improved system efficiency and allows the reference voltage to be adjusted to the exact voltage required for a specific system.

The underlying working principle of the REF194GSZ can be attributed to its internal circuit design. The device combines several technologies in order to achieve its impressive power supply accuracy and temperature stability features. It features a voltage reference (VREF) block which, in combination with an internal voltage divider and an adjustable reference output resistor, allows the reference voltage to be adjusted. Additionally, the internal impedance-matching circuitry of the REF194GSZ reduces the effect of parasitic resistances in the IC.

In summary, the REF194GSZ is specifically designed for use in harsh industrial and automotive applications. Its combination of low power supply, high accuracy, fast response, and low temperature drift make it an ideal voltage reference device for use in applications such as motor control systems, power converters, and over-current protection. The integration of a three-lead operating scheme further enhances its performance and system efficiency.

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