LT8640AJUDCM#PBF

Overview

The LT8640AJUDCM#PBF is a synchronous step-down switching regulator from Analog Devices, designed for high-efficiency power conversion. It features an input voltage range of 3.4 V to 42 V and delivers a continuous output current of 5 A with an 8 A peak capability. The device operates at a fixed switching frequency of 1.95 MHz and supports adjustable output voltages starting from 3.3 V. It incorporates a shutdown function and exhibits a low quiesient current of 750 nA during operation, with standby current as low as 20 nA. The component is housed in a QFN-18 package and is rated for an operating temperature range from -40°C to +150°C junction temperature.

Feature Summary

• Integrates synchronous rectification for enhanced efficiency in buck converter applications
• Features ultra-low standby current consumption to optimize battery life in portable systems
• Includes internal compensation and soft-start mechanisms for simplified design implementation
• Supports wide input voltage ranges suitable for various industrial and automotive power sources

Applications

• Industrial automation control systems
• Automotive infotainment and sensor modules
• Portable medical equipment power supplies
• Telecommunications infrastructure boards

Procurement Notes

Verify the specific suffix #PBF indicates tube packaging when reviewing distributor listings. Confirm that the LT8640AJUDCM variant corresponds to the 1.95 MHz fixed frequency specification rather than the adjustable frequency models within the broader LT8640 family. Ensure compatibility with thermal management requirements given the high junction temperature rating of +150°C. Cross-reference the manufacturer part number against official Analog Devices documentation to confirm availability status, as some distributors may list restricted supply conditions.

Selection Notes

Select this component when a fixed 1.95 MHz switching frequency is required to simplify EMI filtering compared to adjustable frequency variants. The 5 A continuous current rating suits moderate load applications, while the 8 A peak capability handles transient demands. Consider the QFN-18 package size for space-constrained designs. Verify that the 3.3 V minimum output voltage aligns with system requirements, as lower voltage outputs may require different model selections within the series.

Part Context

This part belongs to the LT8640A series, which represents a subset of the broader LT8640 Silent Switcher family. Unlike other variants such as the LT8640J or LT8640I which offer adjustable switching frequencies, the LT8640A is optimized for a fixed frequency operation. It shares the same core architecture and pinout compatibility with other LT8640 devices but differs in internal oscillator settings and specific electrical characteristics tailored for stable performance at 1.95 MHz.

Replacement Considerations

LT8640AJUDCM#TRPBF serves as the tape-and-reel equivalent of this tube-packaged component.