The Analog Devices LT8349 is a 2-phase single output synchronous boost converter that drives two internal N-channel power MOSFET stages out-of-phase. Multi-phase operation reduces input and output capacitor requirements and allows the use of smaller inductors than its single-phase equivalent. Synchronous rectification increases efficiency, reduces power losses, and eases thermal requirements, enabling high-power boost applications.

The LT8349 features Stage Shedding and selectable burst mode operation at light load conditions, allowing high efficiency over a wide load range. It features optional spread spectrum frequency modulation (SSFM) to minimize EMI emissions. The LT8349 integrates 8 V/6 A power switches that operate at a fixed switching frequency programmable between 300 kHz and 4 MHz and are synchronizable to an external clock. The converter also features output soft-start and output overvoltage lockout.

The EVAL-LT8349-BZ evaluation board provides a proven design to evaluate the LT8349 synchronous boost converter. The application circuit is configured to demonstrate optimum performance and component size. Using the board layout example that is optimized for conducted, radiated EMI, and thermal performance will help ensure the designer sees similar performance in their system. The evaluation board is configured to run at 2 MHz per phase with a 6 V output voltage from an input voltage range of 2.5 V to 4.5 V and to deliver up to 5 A load current when V_IN is 4.5 V. It features an adjustable input undervoltage lockout, external clock synchronization, thermal shutdown, selectable mode of operation, and selectable burst mode peak current.