L4931ABDT50-TR

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

• The L4931ABDT50-TR is a positive fixed linear low-dropout voltage regulator manufactured by STMicroelectronics. It provides a stable 5V output with a maximum continuous current of 250mA. The device operates within an input voltage range up to 20V and features a typical quiescent current of 1mA, with a maximum supply current of 6mA. It offers high power supply rejection ratio performance, specified at 70dB at 120Hz and 55dB at 10kHz. The component includes internal overcurrent and thermal overload protection mechanisms. It is housed in a DPAK surface-mount package and is rated for operation across an extended temperature range from -40°C to +125°C.

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

• Positive fixed output configuration delivering regulated voltage
• Integrated overcurrent and thermal overload protection circuits
• High power supply rejection ratio for noise reduction
• Logic-controlled electronic shutdown capability

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

• Battery-powered systems requiring low quiescent current
• Low noise analog circuit power supplies
• Local regulation in embedded board architectures
• Standby mode control for microprocessor units

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

• Verify the specific suffix DT50 against the official datasheet to confirm the 5V fixed output and DPAK package variant. Confirm RoHS3 compliance status as regulatory requirements may vary by production batch. Check for obsolescence notices or last-time-buy dates, as this specific part number indicates a discontinued status in some distributor records. Ensure the ordering quantity matches the manufacturer's standard reel size if tape-and-reel packaging is required for automated assembly.

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

• Select this component when a fixed 5V rail is needed with moderate current demands up to 250mA. The DPAK package suits applications where space efficiency is prioritized over high-power dissipation compared to TO-220 variants. Consider the 1mA quiescent current for battery life optimization. Verify that the input voltage does not exceed the 20V absolute maximum rating under all operating conditions.

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

• This part belongs to the L4931 family of very low drop regulators designed for low power and low noise applications. The AB designation typically indicates a tighter output voltage tolerance compared to the C series. The family supports multiple packages including SO-8, DPAK, and TO-92, offering flexibility for different PCB layout constraints and thermal management needs.

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

• L4931CDT50-TR: Same package and output voltage but with 2% tolerance instead of 1%. L4931ABPT50TR: Same electrical specs but in PPAK package. L4931CV50: Through-hole TO-220 alternative for higher thermal dissipation needs.

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

What is the output voltage tolerance for the L4931ABDT50-TR?

The AB suffix indicates a ±1% output voltage tolerance at 25°C.

Does this component support logic-controlled shutdown?

Yes, the L4931 family includes a TTL-compatible shutdown logic control function to reduce power consumption in standby modes.

What is the minimum capacitor requirement for stability?

The device requires only a 2.2 µF capacitor for stability, which helps save space and cost in the design.