LD2982BM47R

Overview

The LD2982BM47R is an ultra-low dropout voltage regulator from STMicroelectronics, designed for low noise and low power applications in battery-powered systems. It features a very low quiescent current of less than 1 μA in sleep mode when the inhibit pin is pulled low. The device includes a logic-controlled electronic shutdown function on pin 3, which is TTL compatible, allowing for standby modes to decrease total power consumption. It is stable with low ESR ceramic capacitors and offers guaranteed output current up to 50 mA. The regulator provides internal current and thermal limiting protection.

Feature Summary

• Ultra-low dropout voltage operation suitable for low noise applications
• Logic-controlled electronic shutdown for power management
• Stable with low ESR ceramic output capacitors
• Internal current and thermal limit protection

Applications

• Battery powered systems
• Instrumentation
• Audio systems
• Industrial control boards

Procurement Notes

Verify the specific output voltage variant corresponding to the '47' suffix in the model number against official STMicroelectronics documentation before procurement. Confirm package type compatibility, typically SOT23-5L, with your PCB footprint. Ensure input voltage ranges align with system requirements. Check for any specific ordering suffixes that may indicate tolerance or temperature grade variations. Validate component authenticity through authorized distributors.

Selection Notes

Select this regulator for designs requiring minimal quiescent current and stability with ceramic capacitors. Consider the 50 mA output capability and low dropout characteristics for efficient battery life extension. Evaluate the need for the logic-controlled shutdown feature if power management is critical. Ensure the operating temperature range meets environmental specifications. Compare noise performance metrics against other LDOs if audio or sensitive analog signals are present.

Part Context

The LD2982 series belongs to STMicroelectronics' portfolio of low-dropout linear regulators. These components are engineered for efficiency in portable and battery-operated devices. The series emphasizes low noise and fast dynamic response, making them suitable for precision applications. They integrate safety features like thermal and current limiting to protect both the regulator and the load under fault conditions.

Replacement Considerations

Consult official STMicroelectronics substitution guides for verified alternatives. Cross-reference pinouts and electrical parameters such as dropout voltage and quiescent current. Verify package compatibility to ensure mechanical fit without redesigning the PCB layout.