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Analog Devices Inc. EVAL-LTC7890-AZ Evaluation Board is a dual output synchronous step-down converter that drives all N-channel gallium nitride (GaN) field effect transistors (FETs). The board features EPC2218 100V FETs from EPC and the low quiescent current, high-frequency LTC7890 dual step-down DC/DC synchronous controller with a dedicated driver feature for GaN FETs housed in a small 6mm x 6mm QFN package. The LTC7890 offers a programmable fixed frequency from 100kHz up to 3MHz.
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, pulse-skipping, or Burst Mode® operation during light loads. The EXTVCC pin permits the LTC7890 to be powered from the switching regulator’s output or other available source, reducing power dissipation and improving efficiency.
