L4949ED-E

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

The L4949ED-E is a monolithic integrated 5V low-dropout voltage regulator designed for microcomputer-controlled systems, particularly in automotive applications. It features an operating DC supply voltage range of 5 V to 28 V with transient tolerance up to 40 V. The device provides a fixed 5 V output with ±1% precision and supports up to 100 mA load current. Key electrical parameters include a maximum dropout voltage of less than 0.5 V at full load, extremely low quiescent current, and thermal shutdown protection. It is housed in an SOIC-8 package and complies with AEC-Q100 qualification standards.

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

• Integrates power-on reset circuitry that senses the output voltage
• Includes a voltage sense comparator for input monitoring
• Features programmable reset pulse delay via external capacitor
• Provides thermal shutdown and short-circuit protection

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

• Microcomputer-controlled systems
• Automotive electronic applications
• Power management units requiring reset functions

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

Verify component authenticity through authorized STMicroelectronics distributors or certified partners. Confirm the specific suffix indicates the tube packaging variant. Check for recent Product Change Notifications regarding manufacturing site updates. Ensure compliance with RoHS and REACH directives as specified in the official datasheet. Validate AEC-Q100 certification status for automotive-grade requirements before integration.

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

Select this component when a fixed 5V regulation with integrated system supervision is required. The L4949ED-E combines linear regulation with reset generation, reducing external component count. Consider the SOIC-8 package constraints for PCB layout. Evaluate the 100 mA output capability against peak load demands. Verify input voltage stability within the 28 V continuous limit for automotive environments.

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

This part belongs to the L4949 series of multifunction very low drop voltage regulators from STMicroelectronics. The series is engineered for robust performance in noisy automotive environments. It integrates multiple functions typically requiring separate ICs, such as LDO regulation, reset generation, and voltage sensing. The ED suffix denotes the specific package and temperature grade configuration within this product family.

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

The L4949EDTR-E serves as the tape-and-reel equivalent of this component. Both variants share identical electrical characteristics and pinouts. Selection between them depends primarily on manufacturing assembly preferences rather than functional differences. Verify that the replacement matches the required packaging format for automated placement.