L4989D

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

The L4989D is a monolithic integrated voltage regulator designed for automotive applications, featuring a p-channel MOS output element. It provides a fixed 5 V output with high precision and low drop voltage. The device operates within an input voltage range of 5.6 V to 31 V and supports continuous currents up to 150 mA. Key electrical parameters include a typical dropout voltage of 180 mV at full load and a quiescent current that remains very low when the watchdog is disabled. The output voltage accuracy is maintained within ±3% tolerance.

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

• Integrated reset circuit capable of sensing output voltage down to 1 V
• Programmable watchdog timer controlled by external capacitor
• Built-in thermal shutdown and short circuit protection mechanisms

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

• Microprocessor system power supply in automotive environments
• Automotive electronics requiring AEC-Q100 qualification
• Systems needing precise voltage regulation under input transients

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

Verify component authenticity through authorized STMicroelectronics distributors or certified partners. Confirm the specific suffix matches the required package and temperature grade. Check for obsolescence status as automotive components may have limited lifecycle availability. Ensure compliance with RoHS directives and relevant automotive quality standards before integration into production designs.

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

Select this regulator for applications requiring a stable 5 V rail with low dropout characteristics. Consider the programmable watchdog and reset features if microprocessor supervision is needed. Evaluate thermal performance given the 150 mA output capability and operating temperature range. Verify that the input voltage range aligns with the system's power source variations.

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

The L4989D belongs to the L4989 family of low-dropout linear regulators from STMicroelectronics. This series is specifically engineered for automotive-grade reliability, offering robust protection against over-temperature and short-circuit conditions. The family includes variants like the L4989M, sharing similar core functionalities but potentially differing in packaging or specific trim options.

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

Consult official replacement guides for obsolete automotive parts. Potential substitutes may include other AEC-Q100 qualified 5 V LDOs from STMicroelectronics or compatible third-party equivalents with matching pinouts and electrical specifications.