LD3985J33R

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LD3985J33R is a linear voltage regulator integrated circuit (IC). It belongs to PMIC (Power Management IC) and is mainly used to regulate the output voltage of various applications. Its capabilities make it suitable for a wide range of applications, for example, digital and switching power supply voltage, battery and portable power management. In this article, we will discuss the application field and working principle of LD3985J33R.

Overview of LD3985J33R

The LD3985J33R is a low dropout (LDO) linear voltage regulator in a 4-lead TO-263 package. It allows for easy printing on printed circuit boards (PCB). This regulator has a wide output voltage range of 1.25V to 24V, a high input voltage range of 6V to 30V, and a current limit as high as 50mA. It also has sense pins which can be used to adjust the output voltage to a higher or lower value, if necessary.

The LD3985J33R includes a number of features to enhance its performance. It has circuitry to reduce ground current, an error flag that indicates an overload or a short-circuit, and an over-temperature warning. It also has an enable pin which can be used to turn the regulator off and conserve power.

Application Field of LD3985J33R

The LD3985J33R is suitable for a wide range of applications, such as powering digital and switching power supplies, battery and portable power management, and many others. It can be used in high-voltage power supplies, such as 32V, 48V and 56V systems, as well as low-voltage systems like 24V, 12V and 5V.

Its wide input voltage range makes it ideal for applications that require a step-down regulator to adjust the output voltage to the required value. It is also suitable for circuit designs that are susceptible to noise and high-speed transient protection. In addition, its low dropout voltage allows for higher output current than other linear regulators.

Working Principle of LD3985J33R

The LD3985J33R is a low dropout regulator. This means that it can regulate the output voltage while operating at a lower differential voltage than other linear regulators. The lower the differential voltage, the better the regulator\'s regulation performance.

The LD3985J33R comprises two components: an internal P-channel MOSFET switch and an error amplifier. When the input voltage is greater than the output voltage, the MOSFET switch will open, allowing the current to flow from the input to the output. The error amplifier will then sense the voltage difference between the input and output, and adjust the size of the P-channel MOSFET switch to maintain the output voltage at the desired value.

The LD3985J33R also has sense pins which allow the user to adjust the output voltage to higher or lower values, if necessary. The sense pins can be connected to resistors to reduce the voltage gap between the input and output, depending on the application.

Conclusion

In conclusion, the LD3985J33R is a linear voltage regulator in a 4-lead TO-263 package. It has a wide output voltage range of 1.25V to 24V and a higher input voltage range of 6V to 30V. Its wide input voltage range and low dropout voltage make it suitable for a variety of applications. It also has sense pins which can be used to adjust the output voltage and various protective features which enhance its performance. This regulator is ideal for applications that require a step-down regulator, noise protection and high-speed transient protection.

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