LT8390AIFE#PBF

Overview

The LT8390AIFE#PBF is a high voltage, synchronous buck-boost DC/DC converter controller designed for input voltages from 2.7V to 100V. It supports output voltages from 0.6V to 100V with a maximum switch current of 5A. The device features an integrated 100V N-channel top switch and 100V P-channel bottom switch. Operating frequencies range from 100kHz to 2MHz. It includes programmable soft-start, frequency synchronization, and cycle-by-cycle current limiting. The controller operates in continuous conduction mode (CCM) or discontinuous conduction mode (DCM).

Feature Summary

• Integrated high-voltage synchronous switches eliminate external MOSFET requirements.
• Supports wide input and output voltage ranges for flexible system design.
• Enables precise current regulation with internal cycle-by-cycle limiting.

Applications

• Industrial power supplies requiring wide input ranges.
• Battery-powered systems with varying cell counts.
• Automotive electronics operating under load dump conditions.

Procurement Notes

Verify the complete part number including suffixes such as 'IFE' and '#PBF' to ensure correct temperature grade and lead-free compliance. Confirm package type matches the LQFN-40 footprint specifications. Cross-reference manufacturer documentation for specific marking codes and reel quantities to avoid procurement errors.

Selection Notes

Select this component when input voltages exceed standard buck converter limits or fall below boost converter thresholds. Evaluate thermal performance based on expected load currents and ambient temperatures. Ensure inductor selection supports the chosen switching frequency while maintaining efficiency targets within the specified current limits.

Part Context

This controller belongs to the LT8390 family of high-voltage synchronous converters. It shares architectural similarities with other Analog Devices wide-input regulators but distinguishes itself through integrated high-voltage switches. The IFE variant denotes industrial temperature range operation. Compare against discrete solutions to assess board space savings and component count reduction.

Replacement Considerations

Direct replacements include the LT8390EFE#PBF for commercial temperature grades. Verify pin compatibility and control loop stability when substituting variants. Check datasheet revisions for any changes in electrical characteristics or recommended external component values before implementation.