Product Details

Evaluation circuit EVAL-LTC7890-AZ is a dual output synchronous step-down converter that drives all N-channel gallium nitride (GaN) field effect transistors (FETs). The EVAL-LTC7890-AZ evaluation board features EPC2218 100V FETs from EPC.

EVAL-LTC7890-AZ features the LTC®7890: a low quiescent current high frequency (programmable fixed frequency from 100kHz up to 3MHz) dual step-down DC/DC synchronous controller, with a dedicated driver feature for GaN FETs housed in a small 6mm × 6mm QFN package.

The EVAL-LTC7890-AZ operates over an input voltage range from 14V to 72V, while the LTC7890 can operate up to 100V. The EVAL-LTC7890-AZ evaluation circuit produces two outputs: 5V and 12V with up to 20A on each output. EVAL-LTC7890-AZ is configured with sense resistors for current sensing. A mode selector allows the EVAL-LTC7890-AZ to operate in forced continuous operation, pulse-skipping or Burst Mode® operation during light loads. The EXTVCC pin permits the LTC7890 to be powered from the output of the switching regulator or other available source, reducing power dissipation, and improving efficiency. Refer to the LTC7890 data sheet for a complete description of the part operation and application information.

The performance summary table summarizes the performance of the evaluation circuit at room temperature. The evaluation circuit can be easily modified for different applications, including 2-phase single output. The LTC7890 is housed in a 40-lead (6mm × 6mm), side wettable, QFN package. Refer to the data sheet in conjunction with this EVAL-LTC7890-AZ evaluation circuit user guide.