LT8390HUFD#PBF

Overview

The LT8390HUFD#PBF is a synchronous 4-switch buck-boost DC/DC controller from Analog Devices Inc., designed for high-voltage applications. It operates with an input voltage range of 4 V to 60 V and supports output voltages from 0 V to 60 V. The device features a switchable switching frequency between 150 kHz and 650 kHz, allowing optimization for efficiency or component size. It includes integrated soft-start functionality and operates within a junction temperature range of -40°C to +150°C. The controller is housed in a 28-WFQFN (4x5) package.

Feature Summary

• Synchronous 4-switch topology enables efficient buck, boost, and pass-through operation across wide input-output voltage differentials.
• Integrated soft-start capability manages inrush current during power-up sequences.
• Supports clock synchronization to align switching frequency with external systems or reduce EMI.
• Wide operating temperature range suitable for demanding industrial and automotive environments.

Applications

• Industrial power supplies requiring wide input voltage ranges
• Automotive electronics systems
• Battery-powered equipment with varying cell counts
• Telecommunications infrastructure

Procurement Notes

Verify the specific suffix HUFD#PBF against the manufacturer's latest datasheet to confirm pinout compatibility and thermal characteristics. Ensure that the QFN-28 package dimensions match your PCB footprint design. Check for any recent Product Change Notifications (PCNs) regarding material composition or assembly location changes. Confirm availability status as supply constraints may affect lead times. Validate RoHS compliance requirements for your target market regulations before finalizing procurement.

Selection Notes

Select this component when a single controller must handle both step-down and step-up conversions without polarity inversion. The wide input voltage range accommodates sources like 12V, 24V, or 48V buses. Consider the adjustable frequency range to balance magnetic component size against switching losses. The high maximum junction temperature rating allows for robust operation in enclosed spaces. Ensure external MOSFET selection matches the controller's drive capabilities and voltage ratings.

Part Context

This part belongs to the LT8390 family of synchronous buck-boost controllers. Unlike standard buck or boost converters, this topology maintains regulation when the input voltage crosses the output voltage threshold. The HUFD variant specifies the commercial/industrial temperature grade and tube packaging. It serves as a central power management IC for systems where input voltage fluctuates significantly relative to the required output level.

Replacement Considerations

LT8390AHUFD#PBF offers similar functionality but with a higher switching frequency range (600 kHz to 2 MHz). LT8390AIUFD#PBF provides the same high-frequency performance with an extended industrial temperature range up to +125°C. Verify that any substitute maintains the 4-switch buck-boost architecture and compatible control loop characteristics.