LMS3655NQURNLRQ1

Voltage Regulators - DC DC Switching Regulators Overview

The LMS3655NQURNLRQ1 is a synchronous step-down DC-DC converter from Texas Instruments, designed for automotive and industrial applications. It features a wide input voltage range of 3.9 V to 36 V with transient tolerance up to 42 V. The device delivers a continuous output current of 5.5 A at a fixed switching frequency of 400 kHz. It offers fixed 3.3 V or 5 V outputs, or an adjustable range from 1 V to 20 V. Operating within a junction temperature range of -40°C to +150°C, it includes integrated protection features such as UVLO, thermal shutdown, and current limiting.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Advanced high-speed circuit support with innovative frequency foldback architecture enabling regulation from low input voltages
• Integrated open-drain reset output with built-in filtering and delay timers for system status indication
• Optimized layout and HotRod technology to minimize parasitic inductance and reduce radiated noise
• Seamless transition between PWM and PFM modes ensuring high efficiency across all load conditions

Voltage Regulators - DC DC Switching Regulators Applications

• Automotive infotainment systems requiring robust power management
• Industrial control units operating in harsh environments
• Distributed power architectures in vehicle electronics
• High-performance computing modules with strict EMI requirements

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the exact suffix against official Texas Instruments documentation to confirm pinout and electrical specifications. Ensure compatibility with AEC-Q100 Grade 1 requirements if used in safety-critical automotive designs. Confirm moisture sensitivity level handling procedures during assembly to prevent package damage. Cross-reference the specific revision code with the latest datasheet to validate feature availability.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a high-current buck converter with wide input voltage capability is required. The fixed 400 kHz frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the integrated reset function to eliminate external monitoring circuits. Evaluate the thermal performance within the +150°C junction limit for high-power density designs.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LMS36x5-Q1 family of synchronous step-down converters. The series is characterized by high efficiency and advanced EMI reduction techniques. It shares common architectural features with other members like the LMS3635, but offers higher current capacity. The family targets demanding applications where reliability and compact size are critical.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Consult the official LMS3655-Q1 datasheet for confirmed substitute part numbers. Verify pin-to-pin compatibility and electrical parameter alignment before substitution. Generic replacements may not match the specific frequency foldback or reset timer features.