L4931CD33Y

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The L4931CD33Y is a very low drop voltage regulator (VLDO) manufactured by STMicroelectronics, designed for low noise and low power applications. It provides a fixed output voltage of 2.7 V with an output current capability of up to 300 mA. The device operates within an input voltage range of 2 V to 20 V and features a typical dropout voltage of 0.4 V. It includes logic-controlled electronic shutdown functionality, internal current limiting, and thermal protection. The component is housed in an SOIC-8 package and supports surface mount installation. It operates across a temperature range from -40 °C to +125 °C.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Very low dropout voltage enabling efficient operation in battery-powered systems
• Logic-controlled electronic shutdown function for standby mode management
• Internal current and thermal limit protections for enhanced reliability
• Requires only a small output capacitor for stability

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Battery-powered portable devices requiring low quiescent current
• Local regulators in systems needing board-level standby modes
• Low noise power supply circuits for sensitive analog components

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific suffix 'Y' against official datasheets, as it may indicate specific tape-and-reel packaging or testing variations compared to tube-packaged variants like the standard CD33. Confirm availability status, as this part number has been identified as discontinued or having restricted supply in certain regions. Ensure compatibility with existing PCB footprints for the SOIC-8 package before procurement.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when a fixed low-voltage output near 2.7 V is required with minimal dropout characteristics. It is suitable for designs prioritizing low static current consumption during active and shutdown states. Consider the SOIC-8 package constraints and the need for external stabilization capacitors. Verify that the 300 mA output current meets the load requirements without exceeding thermal limits under maximum ambient temperatures.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

The L4931 series comprises very low drop voltage regulators available in multiple packages including SO-8, DPAK, and TO-92. The family offers various fixed output voltages and features TTL-compatible shutdown logic in specific packages. These regulators are engineered for high efficiency in space-constrained and battery-operated applications, providing robust protection features and stable performance across wide operating temperature ranges.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Publicly confirmed substitute part numbers for the exact L4931CD33Y configuration are not available in the provided documentation. Designers should consult the manufacturer's official replacement guide or cross-reference tools for equivalent VLDOs with matching pinouts and electrical specifications.