L4931ABDT33

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

The L4931ABDT33 is a positive fixed linear low-dropout regulator manufactured by STMicroelectronics, delivering a stable 3.3V output with a maximum current capacity of 250mA. It operates within an input voltage range up to 20V and maintains a typical dropout voltage of 0.4V at full load. The device features a quiescent current of approximately 600µA in active mode and 50µA in shutdown mode. It includes internal overcurrent and thermal overload protection mechanisms. The component is housed in a DPAK surface-mount package and supports operation across a temperature range from -40°C to +125°C.

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

• Very low dropout voltage capability ensures efficient power regulation even with minimal input-to-output differential.
• Logic-controlled electronic shutdown function allows for system standby modes to reduce total power consumption.
• Integrated thermal and current limiting protections safeguard the device under fault conditions.
• Requires only a small 2.2 µF output capacitor for stability, minimizing board space and cost.

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

• Battery-powered portable electronic systems requiring low quiescent current
• Local voltage regulation for microprocessor control units
• Low noise power supply circuits in consumer electronics

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

Verify the specific suffix 'AB' indicates the ±1% output voltage accuracy selection at 25°C, distinct from the standard 'C' variant. Confirm the 'DT' designation corresponds to the DPAK (TO-252) surface-mount package. Ensure the trailing '-TR' or absence thereof matches the required tape-and-reel or cut-tape packaging format for your assembly line. Cross-reference the manufacturer datasheet for any recent package change notices or RoHS compliance updates.

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

Select this component when a precise 3.3V rail is needed with tight tolerance requirements, as indicated by the AB grade. It is suitable for designs where input voltage may drop close to the output level due to its low dropout characteristic. Consider the DPAK package for adequate thermal dissipation at higher loads. Verify that the external capacitor value meets the minimum 2.2 µF requirement for loop stability.

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

This part belongs to the L4931 family of very low drop voltage regulators designed for low-power applications. The family offers various output voltages and packages including SO-8, DPAK, and TO-92. The AB suffix specifically denotes the tighter manufacturing tolerance compared to other variants in the series, catering to applications demanding higher voltage accuracy without additional regulation stages.

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

L4931CDT33-TR: Offers similar electrical performance but with ±2% output voltage accuracy instead of ±1%. L4931ABDT33-TR: Identical functional specifications; verify if the explicit '-TR' suffix is required for tape-and-reel compatibility versus bare reel options.