LT8390JUFD#PBF

Overview

The LT8390JUFD#PBF is a synchronous four-switch buck-boost DC/DC controller from Analog Devices. It regulates output voltage, input current, or output current when the input voltage is higher than, lower than, or equal to the output voltage. The device features a proprietary peak-buck/peak-boost current mode control scheme. It operates with an input voltage range of 4 V to 60 V and supports switching frequencies between 190 kHz and 630 kHz. The quiescent current is typically 270 uA. It is housed in a 28-lead QFN (4x5 mm) package.

Feature Summary

• Synchronous four-switch topology enables seamless operation across buck, boost, and pass-through modes without switching noise during transitions.
• Proprietary peak-buck/peak-boost current mode control provides precise regulation of output voltage, input current, or output current.
• Supports fixed frequency operation or internal clock synchronization for flexible system design.

Applications

• Battery-powered systems requiring stable output despite varying battery levels
• Industrial automation controllers with wide input voltage ranges
• Automotive electronics operating under fluctuating supply conditions

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status via official documentation. Check for recent Production Change Notices (PCN) regarding assembly or material updates. Ensure storage conditions meet specified limits to maintain reliability. Validate pinout and marking codes against the latest datasheet revision.

Selection Notes

Select this controller for applications requiring high efficiency across wide input-output voltage differentials. Consider the 190 kHz to 630 kHz frequency range for optimal inductor size and transient response trade-offs. Evaluate thermal performance within the -40°C to +150°C junction temperature range. Ensure external components support the 60 V maximum rating. Verify compatibility with required control modes such as voltage, input current, or output current regulation.

Part Context

The LT8390 series represents Analog Devices' solution for versatile power conversion where input voltage varies significantly relative to the output. Unlike traditional topologies, the four-switch design eliminates dead-zone inefficiencies. The JUFD suffix indicates a specific temperature grade and packaging variant within the LT8390 family, tailored for industrial environments.

Replacement Considerations

LT8390HUFD#PBF offers similar functionality with potentially different thermal or electrical specifications; verify parameter alignment before substitution.

FAQ

How does the LT8390 handle transitions between buck and boost modes?

It uses a proprietary peak-buck/peak-boost control scheme that allows seamless transitions without switching noise, maintaining regulation regardless of whether Vin is greater than, less than, or equal to Vout.

What is the maximum input voltage supported by this device?

The LT8390JUFD#PBF supports a maximum input voltage of 60 V.