LD2985BM27R

Overview

The LD2985BM27R is a fixed-output low-dropout (LDO) voltage regulator manufactured by STMicroelectronics, providing a nominal output voltage of 2.7 V with a maximum load current capability of 150 mA. It operates within an input voltage range of 2.5 V to 16 V and features a very low dropout voltage of 280 mV at full load. The device incorporates logic-controlled electronic shutdown via a TTL-compatible inhibit pin, reducing quiescent current to less than 1 μA in sleep mode. 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 for efficient power management
• Logic-controlled electronic shutdown function for standby power reduction
• Integrated internal current and thermal limit protection mechanisms

Applications

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

Procurement Notes

Verify the specific suffix 'BM27R' against official STMicroelectronics documentation to confirm the exact output voltage rating, as standard datasheets primarily list common voltages like 2.5 V or 3.0 V. Ensure compatibility with the required PCB footprint for the SOT-23-5L package. Confirm that the 2.7 V output aligns with the target circuit design requirements before finalizing procurement orders.

Selection Notes

Select this component when a precise 2.7 V supply rail is required for battery-powered portable electronics. It is suitable for applications demanding low noise and high efficiency under light loads. Consider the SOT-23-5L package constraints regarding thermal dissipation and physical space. Verify that the 150 mA output current meets the peak demand of the downstream load while maintaining regulation within the specified dropout limits.

Part Context

The LD2985 series belongs to STMicroelectronics' portfolio of ultra-low drop and low-noise voltage regulators designed for mobile and handheld devices. This family emphasizes power conservation through minimal quiescent current consumption and advanced shutdown capabilities. The BM27R variant specifically targets applications requiring a stable 2.7 V supply derived from higher voltage sources, fitting within the broader category of linear power management solutions for consumer electronics.

Replacement Considerations

Publicly confirmed substitute part numbers for the LD2985BM27R are not available in the provided source material.