L4931CD33

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

The L4931CD33 is a very low drop voltage regulator from STMicroelectronics, designed for low noise and low power applications. It provides a fixed 3.3 V output with a maximum current of 250 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. Quiescent current is typically 600 µA in ON mode and 50 µA in OFF mode. It includes logic-controlled electronic shutdown, internal current limiting, and thermal protection. Stability requires only a 2.2 µF capacitor. The component supports operation from -40 °C to +125 °C and is available in SO-8, DPAK, PPAK, and TO-92 packages.

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

• Very low dropout voltage enabling efficient battery-powered system operation
• Logic-controlled electronic shutdown for standby mode power reduction
• Internal current and thermal limit protection mechanisms
• Requires minimal external capacitance for stability

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

• Battery-powered systems requiring low quiescent current
• Low noise power supply circuits
• Local regulators with board-level standby control
• Portable consumer electronics

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

Verify the specific package variant (SO-8, DPAK, PPAK, or TO-92) required for your design, as the base part number covers multiple physical forms. Confirm availability status, as this series may have limited stock or end-of-life implications depending on the distributor. Ensure the 3.3 V fixed output matches your system requirements before ordering.

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

Select this component when a fixed 3.3 V rail is needed with minimal external components. The SO-8 package is suitable for surface mount designs requiring compact footprints. Consider the 0.4 V dropout characteristic for applications where input voltage is close to the output level. Verify that the 250 mA load current does not exceed the device's thermal limits under your specific ambient conditions.

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

The L4931 series belongs to STMicroelectronics' portfolio of very low drop voltage regulators. This family emphasizes energy efficiency through low quiescent current and low dropout characteristics. The CD33 suffix specifically denotes the 3.3 V fixed output version. The series integrates safety features like thermal shutdown and current limiting to protect both the regulator and the connected load in various industrial and consumer environments.

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

Direct replacements include other L4931 variants with different output voltages or packages, such as L4931CD50 for 5 V output. Cross-referencing with similar LDOs from other manufacturers requires verifying pinout compatibility and electrical specifications like dropout voltage and quiescent current.