LDS3985PU33R

LDS3985PU33R Application Field and Working Principle

The LDS3985PU33R Voltage Regulator, a part of Texas Instruments’ power management integrated circuit (PMIC) products, is a linear fixed 3.3V output voltage regulator that offershigh efficiency and low-dropout performance. The LDS3985PU33R Voltage Regulator, when used with a small ceramic output capacitor, can provide high output current and stability.

Features

• Wide operational input voltage range: 1.8V to 5.5V
• Output voltage range: adjustable 1.21V to 3.6V
• Low quiescent current: 25μA at light load
• Reverse current protection
• Thermal shutdown and current limit protection
• Very low dropout voltage

Applications

The LDS3985PU33R Voltage Regulator can find applications in a variety of areas, including portable and handheld devices, automotive systems, battery-powered systems, and many more.

• Portable and handheld devices
• Automotive systems
• Battery-powered systems
• Point-of-load regulators
• Wideband power supply regulators

Working Principle

The LDS3985PU33R Voltage Regulator is a linear voltage regulator, meaning that it regulates its output voltage by exchanging energy with the external environment in order to maintain a constant output volt. This energy exchange is accomplished by letting current of various magnitudes pass through the internal components of the voltage regulator. While the current exchange is continuous, the LDS3985PU33R is able to operate efficiently and with a stable output voltage.

The typical operation of LDS3985PU33R can be broken down into four different stages. In the first stage, the converter operates as an unregulated boost regulator, which steps up the input voltage while regulating the output voltage with the help of a series of switches and an inductor. In the second stage, the output of the converter is regulated by a linear regulator, which controls the current being drawn by the output devices. In the third stage, the linear regulator compensates for voltage variations at the output terminals of the converter, thus ensuring that the voltage at the output terminals remains constant. Finally, the linear regulator compares the output voltage to its set reference voltage, and adjusts its output current to match it. By continuously regulating the output voltage, the LDS3985PU33R is able to maintain a constant and stable output voltage.

Conclusion

The LDS3985PU33R Voltage Regulator is a linear fixed 3.3V output voltage regulator that offers high efficiency and low-dropout performance. It finds applications in a variety of areas, including portable and handheld devices, automotive systems, battery-powered systems, and many more. The LDS3985PU33R is able to maintain a constant and stable output voltage by exchanging energy with the external environment in order to maintain a constant output voltage, as regulated by its internal inductor and linear regulator.