L4931ABV33

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

The L4931ABV33 is a fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a stable 3.3 V output with a maximum continuous 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 at full load. Quiescent current is specified as 600 µA in the ON state and 50 µA in the OFF shutdown mode. The unit offers high supply voltage rejection, typically 70 dB for the 5 V version, and maintains accuracy within ±1% at 25 °C. It includes internal thermal overload and short-circuit protection.

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

• Very low dropout voltage enabling efficient operation near input limits
• Logic-controlled electronic shutdown for standby power management
• Internal current limiting and thermal protection mechanisms
• Requires minimal external capacitance for stability

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

• Battery-powered portable systems requiring low quiescent current
• Local voltage regulation in embedded circuits
• Low-noise power supply stages for sensitive analog components
• Standby mode control in multi-rail power architectures

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

Verify component authenticity through authorized STMicroelectronics distributors or certified partners. Confirm package integrity and pin alignment against SO-8 specifications. Check manufacturing date codes for lifecycle status, as availability may vary. Ensure compliance with RoHS directives if required for specific regional regulations. Validate datasheet revisions to confirm parameter consistency before integration.

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

Select this regulator when a fixed 3.3 V rail is needed with minimal external component count. The SO-8 package suits surface-mount designs with space constraints. Consider the 0.4 V dropout characteristic for applications where input voltage margin is limited. Verify thermal dissipation requirements based on the voltage differential and load current to ensure operation within the -40 °C to +125 °C junction temperature range.

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

This component belongs to the L4931 series of very low drop voltage regulators from STMicroelectronics. The series is designed for low-power applications, offering both fixed output voltages and logic-controlled shutdown capabilities. Available in multiple packages including SO-8, DPAK, and TO-92, the family supports various output options such as 3.3 V, 3.5 V, and 5 V. The AB suffix indicates a tighter voltage accuracy tolerance compared to standard variants.

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

Direct substitutes include other L4931 variants with compatible output voltages and packages, such as L4931CD33Y or L4931CV33. Cross-reference pinouts and thermal characteristics to ensure compatibility. Verify that alternative parts meet the same 250 mA output current and 20 V maximum input voltage specifications.