L4998

Power Management - Specialized Overview

The L4998 is a linear voltage regulator designed for automotive safety applications, featuring an integrated watchdog timer and reset circuit. It provides a fixed 5.0V output with a continuous current capability of 90mA and a peak current of 250mA. The device is qualified to AEC-Q100 standards, ensuring reliability in harsh environments. It operates within a wide temperature range and includes protection against short circuits and thermal overload.

Power Management - Specialized Feature Summary

• Integrated safety features including a programmable watchdog timer and reset circuit for microprocessor supervision
• AEC-Q100 qualification for automotive grade reliability and robustness
• Fixed 5.0V output voltage with high precision pre-trimmed reference
• Built-in thermal shutdown and short-circuit protection mechanisms

Power Management - Specialized Applications

• Supplying microprocessor systems in automotive electronics
• Safety power regulation in vehicle control units
• Automotive embedded system power management

Power Management - Specialized Procurement Notes

Verify the specific package type and tape/reel specifications against the official datasheet before ordering. Confirm that the AEC-Q100 qualification status meets your project's automotive reliability requirements. Ensure the input voltage range aligns with your system's supply characteristics to maintain proper dropout performance.

Power Management - Specialized Selection Notes

Select this component when a dedicated automotive-grade linear regulator with integrated safety functions is required. It is suitable for applications needing a stable 5V rail with watchdog capabilities. Consider the 90mA continuous current limit when sizing for load requirements. Compare with similar L49xx series parts if different current ratings or output voltages are needed.

Power Management - Specialized Part Context

The L4998 belongs to STMicroelectronics' L49xx family of automotive low-dropout regulators. This series is specifically engineered for safety-critical applications where reliable power supervision is essential. It complements other automotive PMICs by providing simple, robust voltage regulation with integrated diagnostic features like reset and watchdog timers.

Power Management - Specialized Replacement Considerations

Check for direct pin-compatible alternatives within the L49xx series such as the L4988, noting differences in current rating and feature sets. Verify that any substitute maintains AEC-Q100 qualification and compatible operating voltage ranges.