EVAL-LT8390A-AZ Evaluation Board

Analog Devices Inc. EVAL-LT8390A-AZ Evaluation Board is a synchronous 4-switch buck-boost controller featuring the LT8390A and four EPC GaN FETs. This circuit outputs 24V and maintains tight regulation with up to 5A load current and over an 8V to 60V input voltage range. A 2MHz switching frequency provides a small footprint using a single 6mm x 6mm x 6mm inductor while maintaining high efficiency. The EVAL-LT8390A-AZ board features external clamping circuitry around the bootstrap capacitors to guarantee that the gate drive of the top FETs is driven under the absolute maximum gate-to-source voltage of the GaNFET. Additionally, Schottky diodes are placed anti-parallel to the synchronous GaNFETs to help reverse conduction during the LT8390A’s 25ns dead time.