LM53635NQRNLRQ1

Voltage Regulators - DC DC Switching Regulators Overview

The LM53635NQRNLRQ1 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 features a fixed 5 V output and integrates internal high-side and low-side MOSFETs. It supports a switching frequency of 2.1 MHz, enabling the use of small external components. The IC includes programmable soft-start, adjustable frequency, and cycle-by-cycle current limit protection. It is qualified to AEC-Q100 standards and operates within a junction temperature range of -40°C to +150°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated synchronous buck topology with internal power switches
• Automotive-grade qualification compliant with AEC-Q100 standards
• Wide input voltage range supporting standard automotive bus voltages
• High switching frequency allows for compact passive component selection

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 'N' indicates the non-automotive or specific tape-and-reel variant if required, though 'Q1' denotes automotive qualification. Confirm the package type matches the design layout requirements. Ensure the ordering part number aligns with the exact output voltage and thermal performance needs. Check for any recent Product Change Notifications regarding pinout or marking updates.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 5 V output is required from a wide input range in space-constrained automotive designs. The 2.1 MHz frequency reduces inductor size compared to lower-frequency alternatives. Consider thermal dissipation capabilities given the 3.5 A continuous current rating. Verify that the PCB layout supports the VQFN-HR-22 package for optimal heat transfer.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM53635-Q1 family of high-efficiency synchronous buck converters. It shares the same core architecture as other variants in the series but differs in output voltage configuration and packaging options. The family is designed to replace linear regulators in automotive applications requiring higher efficiency and lower heat generation.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include LM536355QRNLTQ1 (fixed 5V) and LM53635MQRNLTQ1 (adjustable). Cross-reference pinouts and thermal pads before substitution.