LD39100PURY

Overview

The LD39100PURY is a low-dropout linear voltage regulator manufactured by STMicroelectronics, designed for applications requiring high efficiency and low noise. It delivers a maximum output current of 1 A with an input voltage range spanning from 1.5 V to 5.5 V. The device features an adjustable output voltage capability ranging from 800 mV to 4.5 V, maintaining a typical dropout voltage of 200 mV at full load. Quiescent current is specified at 200 µA under load conditions, while the shutdown mode consumes less than 1 µA. It operates within a temperature range of -40 °C to +125 °C and is housed in a DFN-6 package.

Feature Summary

• Ultra-low dropout voltage performance ensures efficient power regulation even with minimal input-to-output differentials.
• Low quiescent current consumption supports extended battery life in portable and energy-constrained devices.
• Integrated logic-controlled electronic shutdown allows deep sleep modes with negligible standby current draw.
• Internal protection mechanisms include short-circuit constant current limiting and thermal overload shutdown.

Applications

• Battery-powered consumer electronics requiring stable voltage rails
• Portable medical instrumentation needing low-noise power supplies
• Wireless communication modules sensitive to power supply ripple
• Automotive infotainment systems utilizing AEC-Q100 qualified components

Procurement Notes

Verify the specific output voltage configuration during procurement, as the LD39100 series includes both adjustable and fixed-voltage variants. Confirm that the DFN-6 package with wettable flanks meets your assembly requirements for automated optical inspection. Ensure compatibility with ceramic capacitors on both input and output lines, as the device stability relies on these specific component types. Check for AEC-Q100 qualification if automotive-grade reliability is mandated for your application environment.

Selection Notes

Select this regulator when designing circuits that demand high current capacity alongside ultra-low noise characteristics. It is suitable for systems where input voltage varies significantly but must remain close to the required output level. Consider its wide operating temperature range for harsh environments. The adjustable output version offers flexibility for custom voltage levels, whereas fixed versions simplify design for standard rail voltages. Evaluate the need for external enable pins if system power sequencing is critical.

Part Context

This component belongs to the LD39100 family of low-dropout regulators from STMicroelectronics. The family is characterized by its ability to drive 1 A loads with minimal voltage loss. It shares core architectural features with other members like the LD49100, though specific electrical parameters such as load regulation may vary between models. The DFN-6 package provides a compact footprint suitable for space-constrained printed circuit board layouts.

Replacement Considerations

Direct substitutes within the same family include the LD39100PU12RY (fixed 1.2 V) or LD39100PU25R (fixed 2.5 V) if a specific voltage is required. For adjustable outputs, verify pin-out compatibility with alternative LDOs offering similar 1 A current ratings and DFN-6 packaging. Ensure any replacement maintains the AEC-Q100 qualification if used in automotive contexts.