LMS3655LQRNLTQ1

Voltage Regulators - DC DC Switching Regulators Overview

The LMS3655LQRNLTQ1 is a synchronous step-down DC-DC converter from Texas Instruments, designed for automotive and industrial applications. It operates with an input voltage range of 3.9 V to 36 V and delivers a fixed 3.3 V output at up to 5.5 A. The device features a 400 kHz switching frequency and achieves high efficiency through seamless transition between PWM and PFM modes. It includes an open-drain RESET output with filtering and Power Good delay, eliminating the need for external supervisory circuitry. Packaged in a 22-pin VQFN-HR, it supports operation from -40°C to +150°C and holds AEC-Q100 qualification.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated open-drain RESET output with configurable filtering and Power Good delay for system status indication
• Seamless transition between pulse-width modulation and pulse-frequency modulation modes to maintain high efficiency across all load conditions
• Exceptional dropout performance enabling elimination of boost stages during start-stop operations

Voltage Regulators - DC DC Switching Regulators Applications

• Automotive infotainment systems requiring stable power delivery
• Industrial control units operating under wide input voltage variations
• Engine control modules needing robust startup performance without boost circuits

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'L' indicates the fixed 3.3 V output variant when ordering. Confirm package type matches the 22-VQFN-HR specification. Ensure compatibility with AEC-Q100 requirements for your target application environment. Cross-reference the datasheet for thermal pad soldering guidelines to ensure reliable mounting.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3 V rail is required at currents up to 5.5 A. It is suitable for designs needing integrated reset supervision to reduce bill of materials. Consider the 36 V input tolerance for direct battery connection scenarios. Evaluate thermal performance within the 22-pin VQFN-HR package constraints for your enclosure design.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LMS3655-Q1 family of high-performance synchronous buck converters. It shares the same PCB layout and evaluation board architecture as the adjustable and 5 V variants within the series. The family is optimized for automotive markets, offering consistent pinouts and functional blocks while varying output configurations and current limits.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The LMS3655MQRNLTQ1 (adjustable output) and LMS3655NQRNLTQ1 (fixed 5 V output) share identical footprints and functionality. They can serve as functional substitutes if the specific output voltage requirement differs or if inventory availability dictates.