L4931ABPT50TR

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

The L4931ABPT50TR is a fixed positive linear low-dropout voltage regulator manufactured by STMicroelectronics. It provides a stable 5V output with a maximum continuous current of 250mA. The device features a maximum dropout voltage of 0.8V at full load and operates within an input voltage range up to 20V. Quiescent current is specified at 1mA, with a maximum supply current of 6mA. Power supply rejection ratio ranges from 70dB at 120Hz to 55dB at 10kHz. It includes internal overcurrent and thermal overload protection and functions reliably across a temperature range of -40°C to +125°C.

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

• Fixed 5V output with 250mA current capability
• Integrated overcurrent and thermal shutdown protection
• Logic-controlled electronic shutdown function for standby modes
• Requires only a 2.2 µF output capacitor for stability

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

• Battery-powered systems requiring low quiescent current
• Local regulators in portable electronics
• Low noise power supply circuits
• Standby mode control in embedded systems

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

Verify the exact suffix and package designation against the manufacturer's latest datasheet, as the L4931 series utilizes various packaging options including PPAK, DPAK, SO-8, and TO-92. Confirm that the specific part number matches the required tolerance class (AB indicates ±1% accuracy) and output voltage configuration. Check component status, as certain variants within this family may be discontinued or subject to long lead times depending on production cycles.

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

Select this component when a fixed 5V rail is needed with moderate current demands under 250mA. The AB suffix denotes tighter voltage accuracy compared to C variants. Ensure the application benefits from the logic-controlled shutdown feature if power management is critical. Verify that the PPAK package fits the thermal and spatial constraints of the design, noting that alternative packages like DPAK or SO-8 are available for different mounting requirements.

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

This component belongs to the L4931 family of very low drop voltage regulators designed for low power applications. The family offers multiple output voltages and packages, including surface mount and through-hole options. Key family characteristics include low dropout voltage, low quiescent current, and TTL-compatible shutdown logic. The L4931ABPT50TR specifically represents the fixed 5V version in the PPAK package with high precision.

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

Direct substitutes include other L4931 variants such as L4931CDT50-TR (DPAK package) or L4931CD50-TR (PPAK package). Cross-referencing pinouts and thermal performance is essential when switching between package types like PPAK and DPAK.