LMR36503MSCERPERQ1

Voltage Regulators - DC DC Switching Regulators Overview

The LMR36503MSCERPERQ1 is an automotive-grade synchronous buck converter from Texas Instruments, designed for high efficiency and compact size. It operates with an input voltage range of 3V to 65V and provides a fixed 3.3V output at up to 300mA. The device features a switch frequency of 2.2MHz and ultra-low quiescent current of 4µA in switching mode. It is housed in a 9-pin VQFN-HR package measuring 2mm x 2mm. Qualified under AEC-Q100 Grade 0, it supports junction temperatures up to +175°C, ensuring reliability in demanding automotive environments.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Automotive qualification compliant with AEC-Q100 standards for Grade 0 temperature ratings.
• Ultra-compact HotRod package design minimizing footprint and external component count.
• High light-load efficiency exceeding 70% at 5mA load conditions.
• Integrated synchronous rectification for improved power conversion performance.

Voltage Regulators - DC DC Switching Regulators Applications

• Infotainment systems requiring stable low-voltage power rails
• Instrument clusters and dashboard electronics
• Body control modules (BCM) and gateway applications
• Sensor interface circuits in automotive platforms

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'MSCER' confirms the fixed 3.3V output variant and Reel packaging configuration. Ensure the Q1 designation is present to confirm AEC-Q100 automotive grade compliance. Cross-reference the manufacturer part number against official Texas Instruments documentation to validate the 2x2mm VQFN-HR package and wettable flank specifications before procurement.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when designing for automotive applications requiring a fixed 3.3V rail with minimal board space constraints. The 2.2MHz switching frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the 4µA quiescent current for battery-backed systems where standby power consumption is critical. Verify that the 300mA output current meets the downstream load requirements without derating issues.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LMR36503E-Q1 family of ultra-small synchronous buck converters. It shares the same core topology and package dimensions as other variants in the series, such as adjustable or different fixed voltage outputs. The family is optimized for size-sensitive automotive designs, utilizing Texas Instruments' HotRod technology to reduce thermal resistance and physical profile while maintaining robust electrical performance.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes within the same family include LMR36503MSCQRPERQ1 for adjustable output or LMR36503MSAERPERQ1 for alternative fixed voltages. Non-family replacements must match the 3V-65V input range, 300mA current capability, and 2x2mm VQFN-HR package. Verify pinout compatibility and thermal characteristics when considering cross-brand alternatives.