L4938NPD013TR

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Linear regulators, also known as linear voltage regulators, are electronic components that regulate voltage. They are characterized by low power consumption, high stability, and good linearity. The L4938NPD013TR is a popular linear voltage regulator from STMicroelectronics.

Application Field of the L4938NPD013TR

The L4938NPD013TR is designed to provide a regulated output voltage of 5.0V. It can handle up to 500mA of current, making it a suitable choice for a variety of different applications. Some of the most common uses of the L4938NPD013TR are:

• Cell phones
• MP3 players
• Computer peripherals
• Tablet computers
• Vehicle audio systems
• Medical equipment

Working Principle

The L4938NPD013TR is based on a control topology known as a linear regulator. This type of voltage regulator works by using a reference voltage, which is applied to a feedback system. The feedback system compares the reference voltage to the output voltage to detect any difference and adjusts the transistor gate voltage accordingly. When the reference voltage is greater than the output voltage, the gate voltage is increased, allowing more current to pass from the input to the output. When the reference voltage is lower than the output voltage, the gate voltage is decreased, reducing the current flowing from the input to the output. This feedback loop ensures a steady, regulated output voltage.

The L4938NPD013TR has a built-in voltage error amplifier that is used to sense the output voltage and adjust the gate voltage accordingly. It also has a power MOSFET located between the input and the output. This MOSFET acts as a switch and is used to control the current flow through the regulator. In addition, the L4938NPD013TR also has a shutdown pin, which can be used to turn off the regulator when it is not needed.

Conclusion

The L4938NPD013TR is a popular linear voltage regulator from STMicroelectronics. It is designed to provide a regulated output voltage of 5.0V and can handle up to 500mA of current. It has a wide range of applications, including cell phones, MP3 players, computer peripherals, tablet computers, vehicle audio systems, and medical equipment. It works by sensing the output voltage and adjusting the transistor gate voltage accordingly, in order to maintain a steady and regulated output voltage. It also features a power MOSFET and a shutdown pin, which can be used to turn off the regulator when it is not needed.

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