L4989MD

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

The L4989MD is an obsolete automotive-grade monolithic integrated 5 V voltage regulator featuring a low-drop p-channel MOS output stage capable of delivering up to 150 mA. It operates within a DC supply voltage range of 5.6 V to 31 V and withstands input transients up to 40 V. The device ensures high precision with a pre-trimmed reference voltage, maintaining output accuracy within ±3%. Key functional parameters include a typical drop voltage of 180 mV at full load and a wide junction temperature range from -40°C to 150°C. It integrates programmable reset delay and watchdog timer functions via external capacitors, alongside thermal shutdown and short-circuit protection.

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

• AEC-Q100 qualified for automotive reliability standards
• Integrated reset circuit sensing output voltage down to 1 V with programmable delay
• Programmable watchdog timer active when Enable pin is high
• Low quiescent current operation with watchdog disabled

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

• Supplying microprocessor systems in automotive applications
• Automotive low power voltage regulation
• Systems requiring precise 5 V regulation under transient conditions

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

The L4989MD is officially classified as an obsolete product by STMicroelectronics. Verification of availability should focus on identifying approved replacement components or alternative part numbers within the manufacturer's portfolio. Direct procurement of this specific obsolete reference is not supported through standard active channels; users must consult official obsolescence notices for valid substitution paths.

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

This component is designed for automotive environments requiring robust voltage regulation with integrated system management features. Selection criteria should prioritize the need for AEC-Q100 qualification, the specific 5 V output requirement, and the integration of watchdog and reset functionalities to simplify microprocessor supply design. The wide operating temperature range supports harsh automotive conditions.

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

The L4989MD belongs to the L4989M series of automotive low power voltage regulators manufactured by STMicroelectronics. These devices are engineered to provide stable 5 V outputs for sensitive electronics in vehicles. The series utilizes BCD technology to combine high-voltage processing with precision analog control, ensuring reliable performance across varying automotive electrical loads and temperatures.

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

As the L4989MD is listed as obsolete, users should seek verified substitute part numbers provided in official STMicroelectronics documentation. Cross-referencing with current automotive voltage regulator portfolios is necessary to ensure compatibility with existing system requirements.