L4938ND

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

Linear voltage regulators are very important in many embedded applications, providing precision voltage control for power supply designs. Linear voltage regulators essentially act as voltage buffers, providing an output voltage within a certain range, and maintaining that voltage despite changes in the load current. The L4938ND is a excellent example of a linear voltage regulator, providing great performance and flexibility. This article will discuss the applications field and working principle of the L4938ND.

Overview

The L4938ND is a linear voltage regulator IC that consists of a voltage reference, voltage error amplifier and controlled output stage. The device can provide an output voltage range of 0.7V to 4.5V, with a current capability of up to 200mA and a low dropout voltage of 200mV at maximum load and an operating temperature range of -40℃ to +125℃. The device is available in a space-saving SOT23-5 package, allowing it to fit into a variety of tight spaces.

Applications

The L4938ND is designed for use in a variety of low power embedded applications. It is commonly used in applications where a precise output voltage is required and the system needs to operate with a wide range of input voltages. It is designed to be used in electric toys, portable measurement instruments, MP3 players, and other mobile applications where space is at a premium. It is also suitable for powering FPGA and microcontroller cores, as well as LCD and touchscreens. Additionally, the device can be used to provide voltage regulation for portable medical and industrial measuring instruments.

Working Principle

The L4938ND is a negative voltage regulator, meaning it uses the input voltage to adjust the output voltage to a lower level. It consists of a voltage reference, error amplifier and output stage. The voltage reference provides a stable reference voltage for the error amplifier, which compares the reference voltage with the output voltage and adjusts it accordingly. The output stage then amplifies the error amplifier\'s output and provides the regulated output voltage.

In order to operate, the L4938ND requires an input voltage source both to power itself, as well as to provide voltage regulation. The device\'s ground pin should also be connected to a low-impedance ground source. Additionally, an output capacitor should be placed between the output pin and the ground pin in order to reduce any noise and maintain the desired output voltage.

The L4938ND is an excellent example of a linear voltage regulator, providing a simple and reliable solution for a variety of low-power embedded applications. The device is able to provide a regulated output voltage over a wide input voltage range, with a low dropout voltage and low quiescent current. The SOT23-5 package ensures that the device can fit into tight spaces, making it ideal for mobile applications.

The specific data is subject to PDF, and the above content is for reference