STMicroelectronics

LDS3985M15R

LDS3985M15R Description

The LDS3985M15R is a linear voltage regulator designed by STMicroelectronics, offering a fixed output voltage of 1.5V and a maximum output current of 300mA. This regulator is housed in a compact SOT23-5 package, making it suitable for surface-mount applications. It features a maximum input voltage of 6V and a low dropout voltage of 0.25V at 300mA, ensuring efficient power conversion even under low input-to-output voltage differentials.

LDS3985M15R Features

• Output Type: Fixed at 1.5V, providing a stable power supply for sensitive electronic components.
• Input Voltage Range: Up to 6V, allowing for compatibility with a variety of power sources.
• Output Current: 300mA, sufficient for driving small to medium-sized loads.
• Low Dropout Voltage: 0.25V at 300mA, ensuring high efficiency even when the input voltage is close to the output voltage.
• Control Features: Includes a shutdown function, enabling power-saving modes and easy control of the regulator's operation.
• Protection Features: Over-current and over-temperature protection safeguard the regulator and connected circuits from damage.
• Low Quiescent Current: 150 µA, minimizing power consumption during operation.
• High Power Supply Rejection Ratio (PSRR): 55dB to 50dB across the 1kHz to 10kHz range, ensuring minimal noise and ripple in the output voltage.
• Package Type: SOT23-5, a compact and robust package suitable for space-constrained designs.
• Mounting Type: Surface mount, facilitating integration into modern PCB designs.
• Compliance: REACH Unaffected and ROHS3 Compliant, ensuring the product meets environmental and safety standards.
• Moisture Sensitivity Level (MSL): Level 1 (Unlimited), indicating high reliability in various environmental conditions.

LDS3985M15R Applications

The LDS3985M15R is ideal for a wide range of applications where a stable and efficient power supply is required. Its low dropout voltage and fixed output make it particularly suitable for:

• Battery-powered devices: Ensuring efficient power conversion and extending battery life.
• Portable electronics: Such as smartphones, tablets, and wearable devices, where space and power efficiency are critical.
• Microcontroller power supplies: Providing a stable voltage source for sensitive digital circuits.
• Low-power sensors and actuators: Ensuring reliable operation in IoT and industrial applications.
• Medical devices: Where low noise and high reliability are essential.

Conclusion of LDS3985M15R

The LDS3985M15R from STMicroelectronics is a versatile and efficient linear voltage regulator designed for modern electronic applications. Its low dropout voltage, fixed output, and compact package make it an excellent choice for applications requiring stable and efficient power conversion. Despite being marked as obsolete, the LDS3985M15R remains a reliable option for designers looking to integrate a high-performance regulator into their designs.