LM53635AQRNLRQ1

Voltage Regulators - DC DC Switching Regulators Overview

The LM53635AQRNLRQ1 is a synchronous step-down DC/DC converter designed for automotive applications. It operates with an input voltage range of 3.9 V to 36 V and delivers up to 3.5 A of output current. The device integrates high-side and low-side N-channel MOSFETs and supports a fixed switching frequency of 2.1 MHz. It features adjustable soft-start, cycle-by-cycle current limiting, and thermal shutdown protection. The component is housed in a 22-pin VQFN-HR package and is qualified to AEC-Q100 standards for operation between -40°C and +150°C junction temperature.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated synchronous rectification with internal high-side and low-side power switches
• Fixed 2.1 MHz switching frequency enabling compact external component sizing
• Automotive-grade qualification compliant with AEC-Q100 reliability standards
• Built-in protection mechanisms including thermal shutdown and cycle-by-cycle current limit

Voltage Regulators - DC DC Switching Regulators Applications

• Automotive infotainment systems
• Telematics control units
• Body control modules
• ADAS sensor power supplies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'L' indicates the standard commercial temperature grade variant within the automotive-qualified family, distinct from 'T' variants which may denote tape-and-reel packaging or different testing criteria. Confirm RoHS compliance status directly with the manufacturer datasheet before integration. Ensure the ordering part number matches the required package type and moisture sensitivity level for your assembly process.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 2.1 MHz frequency is required to minimize passive component size in space-constrained automotive designs. The 3.5 A current capability suits moderate load applications where efficiency at light loads is critical due to the low quiescent current. Consider the VQFN-HR package for its thermal performance and wettable flanks for reliable inspection.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM53635-Q1 family of wide-input voltage synchronous buck converters. It shares architectural similarities with the LMS3655 series but differs in switching frequency and current rating. The family targets robust power management in harsh automotive environments, offering integrated solutions that reduce board space compared to discrete implementations.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM53635AQRNLTQ1 is a direct functional substitute differing primarily in packaging format (tape and reel vs. cut tape). LM536353QRNLTQ1 offers a fixed 3.3 V output instead of adjustable. LMS3655AQRNLRQ1 provides higher current capacity but operates at a lower 400 kHz frequency.