LM64440BPPQRYFRQ1

Voltage Regulators - DC DC Switching Regulators Overview

The LM64440BPPQRYFRQ1 is an automotive-grade synchronous buck DC/DC converter from Texas Instruments. It operates with an input voltage range of 3 V to 36 V and delivers a fixed output of 3.3 V at up to 4 A. The device features a switching frequency of 2.1 MHz and low quiescent current of 600 nA. It is housed in a 22-pin VQFN-HR package (VQFN-FCRLF) rated for operating temperatures between -40°C and +150°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Automotive qualified synchronous buck topology designed for high reliability
• Low electromagnetic interference operation with pin-adjustable light-load mode
• Wide input voltage range supporting 3 V to 36 V sources
• High thermal performance in compact VQFN-HR packaging

Voltage Regulators - DC DC Switching Regulators Applications

• Automotive infotainment systems
• Instrument clusters and body control modules
• ADAS sensor power supplies
• Telematics units

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the complete part number including suffixes such as RYF, which indicates specific tape-and-reel packaging configurations. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure ESD handling protocols are followed due to moisture sensitivity classification. Cross-reference datasheet revisions to ensure compatibility with existing design specifications.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component for applications requiring fixed 3.3 V output with 4 A capability in automotive environments. The 2.1 MHz frequency allows for smaller passive components compared to lower-frequency alternatives. Verify that the load profile remains within the 4 A continuous current limit. Consider thermal dissipation requirements given the VQFN-HR package size and ambient temperature conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM644x0-Q1 family of automotive synchronous buck converters. The series includes variants with different current ratings and output configurations. The LM64440 specifically targets 4 A applications, distinguishing it from higher-current models like the LM64460 or lower-power options within the same automotive-qualified portfolio.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include other LM64440 variants with different suffixes indicating packaging or temperature grades, such as LM64440APPQRYFRQ1. Verify pinout compatibility and electrical parameters before substitution. Generic replacements may lack automotive qualification or specific low-EMI features.