The LD3985J18R is a highly efficient, ultra-low-dropout linear voltage regulator produced by STMicroelectronics, a leader in the semiconductor industry. This regulator is designed to deliver a fixed output voltage of 1.8V with an input voltage range from 2.5V to 6V, making it an ideal choice for battery-powered and low-power applications.

Key Features

• Low Dropout: With an ultra-low dropout of just 0.1V at 50mA load, the LD3985J18R ensures efficient operation even when the input voltage is close to the output voltage, which is crucial for maximizing battery life in portable devices.
• High Accuracy: The output voltage is guaranteed with a precision of ±1% at 25°C, providing a reliable and consistent voltage for sensitive electronic components.
• Low Quiescent Current: The device features a very low quiescent current of 500nA in shutdown mode and 50μA in operation, contributing to the overall energy-saving design of the end application.
• Stability: The LD3985J18R is stable with low ESR ceramic capacitors, ensuring stable performance over a wide range of operating conditions and making it easier to integrate into various designs without the need for bulky tantalum or aluminum electrolytic capacitors.
• Thermal Protection: It incorporates thermal shutdown protection that safeguards the device and the system from damage due to excessive temperatures.

Applications

The LD3985J18R is versatile and can be used in a variety of applications, such as:

• Mobile Phones
• Portable Media Players
• Wireless LAN
• Personal Digital Assistants (PDAs)
• Portable Instruments

Package and Availability

This voltage regulator is available in a small SOT-23-5 package, which is suitable for space-constrained applications. Its compact form factor, combined with its low power consumption and high reliability, makes the LD3985J18R an excellent choice for designers looking to optimize their power management solutions.

For more information, detailed specifications, and to place an order, visit the STMicroelectronics website or contact your local ST sales office.