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Voltage Regulators - DC DC Switching Regulators Overview

The LMS36555QRNLRQ1 is an automotive-grade synchronous step-down DC-DC converter from Texas Instruments. It operates with an input voltage range of 3.9 V to 36 V and delivers a fixed 5 V output at up to 5.5 A. The device features a 400 kHz switching frequency and a typical quiescent current of 7.5 uA. Packaged in a 22-pin VQFN-HR, it supports junction temperatures from -40°C to +150°C and holds AEC-Q100 qualification.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated synchronous buck topology for high-efficiency power conversion
• Automotive qualification compliant with AEC-Q100 standards
• Supports wide input voltage ranges suitable for vehicle electrical systems
• Includes shutdown functionality for power management control

Voltage Regulators - DC DC Switching Regulators Applications

• Automotive infotainment system power distribution
• Electronic control unit (ECU) voltage regulation
• Body control module power supplies
• ADAS sensor power conditioning

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'L' against the official datasheet to confirm pinout and thermal pad configuration matches your design requirements. Ensure the component meets AEC-Q100 grade specifications for your target automotive application environment. Cross-reference the 22-pin VQFN-HR footprint dimensions with your PCB layout guidelines before finalizing procurement orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 5 V output is required for automotive loads drawing up to 5.5 A. The 400 kHz frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the 36 V maximum input rating to ensure compatibility with standard automotive bus voltages and transient conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LMS3655 series of synchronous step-down converters designed for automotive environments. It shares the same core architecture as other variants in the family but is specifically configured for a fixed 5 V output. The series is characterized by high efficiency and robust performance under varying load and temperature conditions typical in automotive applications.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Consult the official datasheet for direct pin-to-pin compatible alternatives within the LMS3655 family. Verify that any substitute maintains the same 5 V fixed output and 5.5 A current capability. Ensure the replacement also holds AEC-Q100 qualification if required for your specific automotive certification needs.