EVAL-LTC7890-AZ

EVAL-LTC7890-AZ is an evaluation circuit with LTC7890 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.

• Output voltage, VOUT1 range from 4.925 to 5.075V at VIN = 14V – 72V, VPRG1 = 0V
• 40mVP-P output voltage ripple, VOUT1(AC) at VIN = 48V, IOUT = 20A
• 48.9mA input current at FCM, VIN = 48V, IOUT1 = IOUT2 = 0A
• 500kHz typ switching frequency
• 94% typ efficiency at VIN = 48V, VOUT1 = 5V, IOUT1 = 20A