L4949EP

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

The L4949EP is a monolithic integrated 5V voltage regulator featuring very low dropout output and auxiliary functions including power-on reset and input voltage sense. Designed for microcomputer-controlled systems, particularly in automotive applications, it operates within a DC supply voltage range of 5 V to 28 V with transient immunity up to 40 V. The device provides an output current capability of up to 100 mA and maintains high precision standby output voltage at 5V±1%. It incorporates extremely low quiescent current in standby mode, thermal shutdown protection, and short circuit protections.

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

• Monolithic integrated 5V voltage regulator with very low dropout characteristics
• Integrated power-on reset circuit with programmable pulse delay via external capacitor
• Input voltage sense comparator for supervising supply conditions
• Built-in thermal shutdown and short circuit protection mechanisms

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

• Microcomputer controlled systems
• Automotive electronic applications

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

Verify component authenticity through authorized STMicroelectronics distributors or direct channels. Confirm package type matches the SO-20W specification required for your design. Ensure compliance with RoHS directives and ECOPACK standards during procurement. Validate that the specific lot meets automotive reliability requirements if applicable to your deployment environment.

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

Select this component when designing systems requiring a fixed 5V output with integrated supervision features. Consider the SO-20W package for higher pin count applications needing separate sense and reset outputs. Evaluate the low dropout performance against your minimum input voltage constraints. Verify that the 100 mA output current aligns with your load requirements without exceeding thermal limits.

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

The L4949E series belongs to STMicroelectronics' multifunction voltage regulator family designed for robust power management. This specific EP variant utilizes the SO-20W surface mount package, offering additional pins for the sense comparator and reset delay adjustments compared to simpler variants. It serves as a comprehensive solution for stabilizing power supplies while monitoring system health in demanding environments.

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

Public confirmed substitute part numbers: L4949ED (SO-8 package variant).