STMicroelectronics L4949EPTR-E Linear Voltage Regulator IC - 5V Output, 100mA Automotive-Grade

STMicroelectronics L4949EPTR-E: Precision Linear Regulation for Automotive Applications

In the demanding landscape of automotive electronics, reliable voltage regulation is critical for ensuring system stability and longevity. The STMicroelectronics

L4949EPTR-E

Linear Voltage Regulator IC emerges as a robust solution designed specifically for automotive environments requiring precision, durability, and integrated protection features. This fixed-output 5V regulator combines low dropout voltage performance with advanced safety mechanisms, making it ideal for powering sensitive electronic components in vehicles.

Operating within a wide input voltage range up to 28V while maintaining a stable 5V output, the L4949EPTR-E accommodates fluctuating automotive power systems. Its 0.5V dropout voltage at 100mA load current ensures continued operation during voltage dips, while the 100mA output current capacity supports modern automotive control modules without thermal stress concerns. The device's quiescent current of just 300µA enhances energy efficiency, crucial for battery-powered systems.

Parameter	Specification
Output Voltage	Fixed 5V
Max Input Voltage	28V
Output Current	100mA
Dropout Voltage	0.5V @ 100mA
Operating Temperature	-40°C to 125°C

Advanced Protection Architecture

Built to withstand harsh automotive conditions, this IC incorporates comprehensive protection features including over-temperature shutdown, short-circuit current limiting, and reverse polarity protection. The integrated reset function provides system monitoring capabilities, ensuring reliable operation during power transients common in vehicle electrical systems.

The surface-mount 20-SOIC package offers excellent thermal dissipation while maintaining compatibility with automated PCB assembly processes. With AEC-Q100 qualification, the L4949EPTR-E meets stringent automotive reliability standards, making it suitable for engine control units, infotainment systems, sensor interfaces, and other vehicle electronics requiring stable power delivery.

Key Advantages

Engineers benefit from the regulator's low noise performance and high ripple rejection characteristics, which maintain clean power supply rails for microcontrollers and analog circuits. The device's thermal shutdown feature automatically protects against overheating, while the low quiescent current draw extends battery life in always-on systems.

Tags: Automotive Electronics, Voltage Regulation, Low Dropout Regulator, Surface Mount IC, Power Management Solutions