LM4128DQ1MF2.0/NOPB

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Power management integrated circuits (PMICs) are used in many applications, ranging from embedded and mobile platforms to industrial and automotive components. One type of PMIC is a voltage reference, which is used to accurately measure and maintain a constant voltage output to a load. The LM4128DQ1MF2.0/NOPB is a voltage reference, specifically a low-power low-dropout (LDO) voltage reference featuring a continuously adjustable output voltage and maximum output current of ±1.5mA. This IC is ideal for battery-operated and power sensitive applications.

The LM4128DQ1MF2.0/NOPB consists of two pins, the input pin and the output pin. The input pin is connected to a voltage source, usually a DC power supply, and can regulate between 2.4V and 5.5V. The output pin is connected to the reference voltage and has an accuracy of ±1%. The output voltage can be adjusted by an external dividing network between the reference voltage and ground. This allows for a range of voltage outputs from the IC. The reference voltage is designed to be stable and precise when the input voltage varies by ±200mV. The output voltage is also adjustable with a process trim feature which makes possible to readjust the output current after soldering.

The working principle of the LM4128DQ1MF2.0/NOPB is simple and it is divided into two parts, the internal reference voltage generation and the load operation. The reference voltage generation is done by a high-precision voltage divider stage consisting of two resistors of equal value. This divides the input voltage into two equal parts, thus providing a reference voltage of the divided input voltage. The reference voltage is then applied to the output terminal through a buffer amplifier and the output voltage is maintained at the reference level.

The load operation is used to maintain the output voltage by controlling the current flow. The current flow is regulated by a series of electronic switches connected to the output pin. When the voltage on the output pin exceeds a preset level, the electronic switch is activated and the current is diverted away from the output pin. This prevents the output from overloading the supply. Similarly, when the voltage on the output pin drops, the electronic switch is deactivated and the current is allowed to flow through the output pin. As a result, the output voltage is maintained at a stable level.

The LM4128DQ1MF2.0/NOPB is suitable for applications where an accurate, low-power voltage reference is required. This includes battery-powered circuits and systems, as well as power sensitive applications such as embedded systems, automotive appliances, consumer electronics and many more. Its low power consumption and adjustable output voltage make it an ideal choice for these applications.

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