LD2985BM47R

Overview

The LD2985BM47R is a fixed-output low-dropout (LDO) voltage regulator manufactured by STMicroelectronics, providing a nominal output voltage of 4.7 V with a maximum load current of 150 mA. It operates within an input voltage range of 2.5 V to 16 V and features a very low dropout voltage, specified at 280 mV under full load conditions. The device incorporates logic-controlled electronic shutdown via a TTL-compatible inhibit pin, allowing for reduced power consumption in standby modes. Internal protections include current limiting and thermal shutdown. The component is housed in a compact SOT-23-5L package and supports an operating temperature range from -40 °C to +125 °C.

Feature Summary

• Ultra-low dropout voltage performance suitable for battery-powered systems
• Logic-controlled electronic shutdown function for power management
• Integrated internal current and thermal protection mechanisms

Applications

• Cellular phones
• Palmtop laptop computers
• Personal digital assistants (PDA)
• Camcorders and cameras

Procurement Notes

Verify the specific suffix 'BM47R' against official STMicroelectronics documentation to confirm the exact output voltage rating, as standard datasheets typically list common voltages like 3.3 V or 5 V. Ensure the ordering code matches the required tolerance and package variant. Cross-reference the part number with authorized distributors to confirm active status and availability before procurement.

Selection Notes

Select this component when a stable 4.7 V supply is required for low-noise applications with limited space constraints. The SOT-23-5L package offers a small footprint ideal for portable electronics. Consider the 150 mA current limit and dropout characteristics relative to the system's input voltage variations. The inhibit feature allows for efficient power management in devices requiring standby modes.

Part Context

The LD2985 series belongs to STMicroelectronics' portfolio of ultra-low-dropout linear regulators designed for low-power and noise-sensitive applications. This family shares common architectural features such as low quiescent current and robust protection circuits. The BM47R variant specifically targets applications needing a precise 4.7 V rail, fitting into the broader ecosystem of LDOs used in mobile and consumer electronics.

Replacement Considerations

Publicly confirmed substitute part numbers for the LD2985BM47R are not available in the provided source material. Verify compatibility with alternative LDOs based on output voltage, current capacity, and package dimensions.