LT8640JUDCF#WPBF

Overview

The LT8640JUDCF#WPBF is a synchronous step-down Silent Switcher regulator from Analog Devices, designed for high-efficiency power conversion. It supports an input voltage range of 3.4 V to 42 V and delivers up to 5 A of output current. The adjustable output voltage spans from 970 mV to 41.9 V. Operating with a switchable frequency between 200 kHz and 3 MHz, the device features a low quiescent current of 2.5 µA. It is housed in a QFN-18 package and meets AEC-Q100 automotive qualification standards.

Feature Summary

• Integrates Silent Switcher technology to minimize electromagnetic interference radiation without requiring external ferrite beads or complex layout techniques.
• Features synchronous rectification architecture to enhance conversion efficiency across wide load ranges.
• Includes programmable switching frequency allowing optimization for either size or efficiency requirements.
• Provides low no-load quiescent current to maintain system efficiency during standby or light-load conditions.

Applications

• Automotive infotainment and telematics systems
• Industrial distributed power architectures
• Point-of-load regulation for processors and FPGAs
• Battery-powered equipment requiring high efficiency

Procurement Notes

Verify the specific suffix #WPBF indicates tube packaging when ordering. Confirm AEC-Q100 automotive grade status aligns with target application requirements. Ensure input voltage does not exceed 42 V maximum rating. Check thermal performance against ambient temperature constraints for the QFN-18 package. Validate that the 5 A continuous current capability meets peak load demands.

Selection Notes

Select this component for applications requiring compact footprint and low EMI emissions. Consider the 3.4 V minimum input voltage for battery-operated designs. Evaluate the 200 kHz to 3 MHz frequency range against inductor size constraints. Compare the 5 A output current against system peak loads. Verify compatibility with the required output voltage adjustment range.

Part Context

This part belongs to the LT8640 family of Silent Switcher regulators. It shares core topology with variants like LT8640IUDC but differs in temperature grade and packaging. The J suffix denotes automotive-grade reliability. It complements higher-current options like the LT8640SEV while offering lower quiescent current than standard buck converters.

Replacement Considerations

LT8640IUDC#TRPBF offers similar electrical characteristics in tape-and-reel packaging. LT8640JUDCF#WTRPBF provides identical functionality in reel format. LT8640AJUDCM#WTRPBF is available as a development tool variant. Verify pinout and thermal pad connections before substitution.