LT8390JFE#PBF

Overview

The LT8390JFE#PBF is a synchronous 4-switch buck-boost DC/DC controller from Analog Devices Inc., designed for high-efficiency power conversion. It supports an input voltage range of 4V to 60V and provides one regulated positive output. The device operates with a switching frequency between 190kHz and 630kHz, featuring a maximum duty cycle of 95%. It includes clock synchronization capabilities and integrates control features such as current limiting, frequency control, slope compensation, and soft start. The component is housed in a 28-TSSOP-EP package and is rated for operation within a temperature range of -40°C to +150°C.

Feature Summary

• Synchronous 4-switch topology enables efficient buck, boost, and pass-through operation across wide input/output voltage ranges.
• Clock synchronization capability allows multiple controllers to be phase-shifted to reduce input/output ripple and electromagnetic interference.
• Integrated pass-thru mode eliminates switching noise during direct battery connection applications.
• Comprehensive protection and control features include adjustable current limit, soft start, and thermal shutdown.

Applications

• Automotive infotainment and body electronics systems requiring wide input voltage tolerance.
• Industrial equipment power supplies operating in harsh environments with varying line conditions.
• Battery-powered devices where pass-through functionality is required to bypass switching regulators.
• LED lighting drivers needing stable current regulation across fluctuating supply voltages.

Procurement Notes

Verify the specific suffix 'J' against the manufacturer's official datasheet to confirm the exact switching frequency range and performance grade, as variations exist within the LT8390 family. Ensure the procurement channel provides valid RoHS compliance documentation and material declarations. Cross-reference the 28-TSSOP-EP package marking codes with official Analog Devices identification guides to prevent counterfeit components. Confirm that the supplier offers genuine parts with traceable manufacturing dates.

Selection Notes

Select this controller when designing systems requiring a single-stage solution for both step-up and step-down conversion without external MOSFETs. Consider the 190kHz to 630kHz frequency range for balancing efficiency and passive component size. Evaluate the need for clock synchronization if multiple phases are used to minimize system noise. Verify that the 60V maximum input rating aligns with the application's transient voltage specifications. Assess thermal requirements given the 150°C junction temperature rating for high-temperature industrial or automotive use cases.

Part Context

The LT8390 series represents Analog Devices' approach to simplifying complex power architectures by integrating four switches into a single controller IC. This design reduces board space and component count compared to discrete solutions. The J variant specifically targets applications requiring defined frequency ranges and robust performance under varying load conditions. It complements other PMIC offerings by providing flexible topologies suitable for modern electronic designs demanding high reliability.

Replacement Considerations

LT8390IFE#PBF: Offers similar functionality but may differ in switching frequency range and specific electrical characteristics; verify datasheet compatibility.

FAQ

Does the LT8390JFE#PBF support clock synchronization?

Yes, the device includes a clock sync pin that allows it to synchronize its switching frequency with an external master clock or another controller.

What is the maximum input voltage for this controller?

The LT8390JFE#PBF supports an input voltage range up to 60V, making it suitable for 24V and 48V bus applications.

Can this controller operate in pass-through mode?

Yes, the integrated pass-thru mode allows the input voltage to connect directly to the output when the input is within the regulated range, eliminating switching losses.