NJU7231L28

PMIC - Voltage Regulators - Linear

NJU7231L28 is a 4-pin “fixed voltage regulator” (also called “linear regulator”) designed for low current, low noise and low power applications. It is also integrated with temperature protection and short-circuit protection.

Application Field

NJU7231L28 can be used mainly in the following applications:

• Portable electronics and digital devices
• Memory, automotive and industrial equipment
• Cellular phones and MP3 players.

Working Principle

NJU7231L28 is a “linear” regulator, which uses an inside control system to maintain a constant output voltage level. This regulator consists of an input stage that rectifies the incoming voltage and provides a smooth DC voltage, a feedback amplifier and a power transistor output stage. The feedback amplifier senses the output voltage and compares it with the reference voltage.

The main components of NJU7231L28 are: a sense resistor, the error amplifier, the system power transistor and the output capacitor. The sense resistor is used to compare the output voltage with the reference voltage to determine how much current should be outputted. The error amplifier is used to provide an output voltage that is proportional to the actual output voltage. The system power transistor is used to control the output current of the regulator.

In conclusion, NJU7231L28 is an ideal choice for low current, low noise, and low power applications. It is also integrated with short protection and temperature protection. With the design of low noise and low power, the user can get a stable, long-lasting power supply with NJU7231L28.