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LM4128DMF-2.5/NOPB Application Field and Working Principle

The LM4128DMF-2.5/NOPB is an adjustable, ultra-low power, low dropout linear voltage regulator (LDO) series. It is designed to provide a voltage reference to power low-current, low-power integrated circuits. It is part of the National Semiconductor Standard Linear category and belongs to the PMIC - Voltage Reference family.

The LM4128DMF-2.5/NOPB is a high-performance, adjustable voltage reference device that can accurately regulate the output voltage of an integrated circuit, while decreasing current and power consumption significantly. This makes it an ideal choice when supplying power to multiple components on the same circuit board, as it allows different parts to share the same voltage reference and can operate over a wide range of temperatures. Furthermore, the low-dropout (LDO) design of the LM4128DMF-2.5/NOPB makes it possible to regulate a 3.3V output voltage with a minimum dropout voltage difference of PmbO.3V, ensuring that the output voltage does not significantly decrease when operating at low output current.

The LM4128DMF-2.5/NOPB is designed for applications such as powering of voltage regulators, charge pumps, and linear regulators, as well as a reference for Analog-to-Digital Converters (ADCs), Digital-to-Analog Converters (DACs), and other precision ICs. The device has an adjustable output voltage range of 1.203 V to 5.50 V, with an input voltage range of 1.2 V to 3.6 V. Additionally, the LM4128DMF-2.5/NOPB has a low-noise profile, as well as low-ripple rejection, making it suitable for high-performance circuits.

The LM4128DMF-2.5/NOPB’s working principle follows the typical design of a low-dropout (LDO) linear regulator, where the output voltage is regulated by establishing a difference between the input and output voltages by means of an internal voltage divider. The output voltage is determined by the ratio of the resistor divider, which is adjustable. The output voltage is regulated by varying the current through a series pass transistor, as the voltage divider is adjusted. In order to do so, an internal current circuit is used to measure the output voltage, and it is compared to a reference voltage. If the output voltage is lower than the reference voltage, the current is increased, allowing more current to pass through the pass transistor, hence raising the output voltage. On the contrary, if the output voltage is higher than the reference voltage, the current is decreased, reducing the amount of current that passes through the pass transistor, thus lowering the output voltage.

In summary, the LM4128DMF-2.5/NOPB is an adjustable, ultra-low power, low-dropout linear voltage regulator (LDO) series specifically designed to provide a voltage reference to power low-current, low-power integrated circuits. This device has a adjustable output voltage range of 1.203 V to 5.50 V, with an input voltage range of 1.2 V to 3.6 V, a low-noise profile, and a low-ripple rejection. It is designed for applications such as powering of voltage regulators, charge pumps, and linear regulators, as well as a reference for ADCs, DACs, and other precision ICs.

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