STMicroelectronics

LDS3985PM33R

LDS3985PM33R Description

The LDS3985PM33R is a linear regulator IC designed for power management applications, manufactured by STMicroelectronics. This device features a fixed output voltage of 3.3V and is capable of delivering a maximum output current of 300mA. It operates with an input voltage range up to 6V and maintains a low dropout voltage of 0.25V at 300mA, ensuring efficient power conversion even at low input-to-output voltage differentials. The regulator is designed with a positive output configuration and includes a shutdown control feature for enhanced power management. It also offers over-current and over-temperature protection, ensuring reliable operation under various conditions.

The LDS3985PM33R is housed in a surface-mount 6DFN package, making it suitable for compact designs. It has a maximum supply current of 300 µA and a quiescent current of 150 µA, contributing to its energy-efficient performance. The regulator boasts a power supply rejection ratio (PSRR) of 55dB to 50dB across frequencies from 1kHz to 10kHz, effectively filtering out noise from the input supply. This device is REACH unaffected and RoHS3 compliant, adhering to stringent environmental standards. It is also moisture sensitivity level 3 (MSL3) rated, suitable for a 168-hour exposure period.

LDS3985PM33R Features

• Fixed Output Voltage: 3.3V, ideal for applications requiring a stable and precise voltage supply.
• High Output Current: Capable of delivering up to 300mA, suitable for powering various electronic devices and components.
• Low Dropout Voltage: 0.25V at 300mA, ensuring efficient operation even with minimal input-to-output voltage differences.
• Control Features: Includes a shutdown function, allowing for dynamic power management and reduced power consumption during idle periods.
• Protection Features: Over-current and over-temperature protection mechanisms safeguard the device and connected circuits from potential damage.
• Efficient Power Management: With a maximum supply current of 300 µA and a quiescent current of 150 µA, the regulator minimizes power loss.
• Noise Reduction: A PSRR of 55dB to 50dB across 1kHz to 10kHz frequencies ensures a clean output voltage, reducing the impact of input supply noise.
• Compliance and Reliability: REACH unaffected, RoHS3 compliant, and MSL3 rated, ensuring environmental compliance and reliability in various operating conditions.
• Packaging: Available in a surface-mount 6DFN package, suitable for compact and space-constrained designs.

LDS3985PM33R Applications

The LDS3985PM33R is ideal for a wide range of applications where a stable and efficient power supply is required. Its fixed 3.3V output and high current capability make it suitable for powering microcontrollers, sensors, and other low-power electronics. The low dropout voltage ensures efficient operation in battery-powered devices, extending battery life by minimizing power loss during voltage regulation. The shutdown feature allows for dynamic power management, making it suitable for applications that require power-saving modes, such as portable devices and IoT sensors.

The regulator's noise reduction capabilities make it ideal for applications sensitive to power supply noise, such as audio and communication systems. Its compact surface-mount package and compliance with environmental standards make it suitable for modern, space-constrained designs, including wearable devices and small form-factor electronics.

Conclusion of LDS3985PM33R

The LDS3985PM33R is a robust and efficient linear regulator designed for power management applications. Its fixed 3.3V output, high current capability, and low dropout voltage make it an ideal choice for a variety of electronic devices. The inclusion of shutdown control and over-current and over-temperature protection features enhances its reliability and versatility. The regulator's compliance with environmental standards and its compact surface-mount package further contribute to its suitability for modern, space-constrained designs. While the product is marked as obsolete, it remains a reliable option for applications requiring a stable and efficient power supply.