L4931ABD50

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

The L4931ABD50 is a fixed positive low-dropout linear voltage regulator manufactured by STMicroelectronics, providing a stable 5 V output with a maximum continuous current of 250 mA. It operates within an input voltage range up to 20 V and features a typical dropout voltage of 0.4 V at full load, ensuring efficient power management in battery-powered systems. The device incorporates internal current limiting and thermal shutdown protection for robust operation. It maintains high supply voltage rejection, typically 70 dB for the 5 V version, and requires only a 2.2 µF output capacitor for stability. The component supports a wide operating temperature range from -40 °C to +125 °C and offers ±1% output voltage accuracy at 25 °C.

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

• Very low dropout voltage capability enables efficient regulation even when input voltage approaches the output level.
• Logic-controlled electronic shutdown function allows system standby modes to reduce total power consumption.
• Internal current and thermal limit protections safeguard the device against overload and overheating conditions.
• Requires minimal external capacitance for stability, facilitating compact printed circuit board designs.

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

• Battery-powered portable electronic devices requiring extended operational life
• Local voltage regulation in embedded systems with TTL-compatible control signals
• Low-noise power supplies for sensitive analog circuits

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

Verify the specific suffix 'AB' indicates the ±1% output voltage accuracy selection class as documented in official STMicroelectronics datasheets. Confirm package type compatibility, as the L4931 series is available in SO-8, DPAK, and TO-92 configurations. Ensure the design accounts for the required 2.2 µF minimum output capacitance for stability. Check for end-of-life status or alternative recommendations from the manufacturer before finalizing procurement plans.

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

Select this component when a fixed 5 V output with high precision (±1%) is required alongside low quiescent current consumption. The logic-controlled shutdown feature makes it suitable for applications needing active power management. Consider the thermal performance and package options based on the expected load current and ambient temperature conditions. Verify that the input voltage remains within the 20 V maximum limit under all operating scenarios.

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

The L4931ABD50 belongs to the L4931 family of very low-dropout regulators designed for low-power applications. This family emphasizes energy efficiency through low quiescent current and minimal external component requirements. The 'AB' suffix denotes a tighter output voltage tolerance compared to standard variants, catering to applications demanding higher regulation accuracy without additional feedback networks.

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

Direct substitutes may include other L4931 variants with different output voltages or accuracy classes, such as L4931CD50 or L4931CV50, provided pin compatibility and electrical specifications align with the application requirements. Always verify functional equivalence and package dimensions before substitution.