LMR51603XQDBVRQ1

Voltage Regulators - DC DC Switching Regulators Overview

The LMR51603XQDBVRQ1 is an automotive-grade synchronous buck converter from Texas Instruments, designed for high-voltage applications. It operates with an input voltage range of 4 V to 65 V and delivers a regulated output current of 300 mA. The device supports adjustable output voltages from 800 mV to 28 V. Key electrical parameters include a switching frequency of 1.1 MHz and a quiescent current of 38 uA during operation. It functions within a temperature range of -40°C to +150°C and utilizes a SOT-23-6 package.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Automotive qualification compliant with AEC-Q100 standards for reliability in vehicle environments.
• Integrated synchronous rectification provides efficient power conversion in a compact footprint.
• Wide input voltage capability allows direct connection to high-voltage automotive buses.
• Fixed internal switching frequency enables the use of small external passive components.

Voltage Regulators - DC DC Switching Regulators Applications

• High-voltage distributed power architectures in automotive systems
• Step-down conversion for infotainment and instrument cluster supplies
• Power management for sensor nodes requiring isolated or regulated rails

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'X' against the official Texas Instruments datasheet to confirm exact marking and revision status. Ensure the component meets the required AEC-Q100 grade for your specific automotive application zone. Cross-reference the ordering part number with manufacturer documentation to avoid confusion with non-automotive variants like the LMR51603Y.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a wide input voltage range up to 65 V is required alongside low standby power consumption. The 300 mA output current suits light-load automotive electronics. Consider the 1.1 MHz fixed frequency for minimizing inductor size compared to lower-frequency alternatives. Verify thermal performance requirements given the high maximum junction temperature rating.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LMR516xx family of high-voltage synchronous buck converters. It shares architectural similarities with the LMR51610 but offers lower output current capacity. The 'Q1' suffix denotes automotive qualification, while 'X' typically indicates specific tape-and-reel or marking variations defined by the manufacturer.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LMR51603YDBVR is the commercial equivalent without automotive qualification. LMR51610XQDBVRQ1 offers higher current capacity (1 A) with similar input specifications. Verify pin compatibility and thermal characteristics before substituting.