LD2985AM15R

Overview

The LD2985AM15R is a fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics, providing a stable 1.5 V output with a maximum load current of 150 mA. It features an ultra-low dropout voltage of 280 mV at full load and 7 mV at 1 mA. The device incorporates a logic-controlled inhibit function on pin 3 for electronic shutdown, reducing quiescent current to less than 1 μA in sleep mode. Internal protections include current limiting and thermal shutdown. Noise performance is enhanced via a bypass pin, achieving 30 μVrms with a 10 nF capacitor. It operates within a temperature range of -40 °C to 125 °C and is housed in a compact SOT23-5L package.

Feature Summary

• Ultra-low dropout voltage ensures efficient power regulation under varying load conditions
• Logic-controlled inhibit function enables precise power management and standby modes
• Low output noise voltage suitable for sensitive analog and RF circuits
• Integrated thermal and current protection safeguards against overload

Applications

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

Procurement Notes

Verify the specific suffix 'AM15R' against official STMicroelectronics documentation to confirm the 1.5 V fixed output voltage and SOT23-5L packaging. Ensure compatibility with system requirements regarding the 150 mA output current limit and the -40 °C to 125 °C operating temperature range. Confirm that the TTL-compatible inhibit logic aligns with the control interface design.

Selection Notes

Select this component for battery-powered systems requiring low quiescent current and high efficiency due to the ultra-low dropout characteristic. The integrated inhibit feature makes it ideal for applications needing localized power management or standby modes. Consider the low noise specification if powering sensitive signal processing stages. Verify that the 150 mA current capacity meets the peak load demands of the target circuit.

Part Context

The LD2985 series comprises fixed-output LDO regulators designed for low-noise, low-power applications. This specific variant provides a 1.5 V output, catering to digital logic and sensor supply needs. The series is characterized by its small SOT23-5L footprint and robust protection features, making it a standard choice for portable consumer electronics where space and power efficiency are critical constraints.

Replacement Considerations

Cross-reference with other LD2985 variants offering different fixed output voltages if the system requires a different rail. Verify pin-out compatibility when substituting with other STMicroelectronics LDOs in the same package family.