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Analog Devices Inc. EVAL-LTC7891-AZ Evaluation Board features the LTC7891 100V Step-Down Synchronous GaN FET controller. The LTC7891 is specifically designed to drive up to 100V GaN FETs safely and easily through internally optimized bootstrap switches and smart dead time control. Split gate drivers allow for easily adjustable turn-on and turn-off of the FETs. Additionally, the IC features low IQ, up to 3MHz programmable/synchronizable switching frequency, spread spectrum, and a small 28-lead (4mm x 5mm) side wettable QFN package. These features allow for various industrial, military, medical, and telecommunications applications.
The EVAL-LTC7891-AZ operates from a 15V to 72V input voltage range, generating a 12V, 20A output. The LTC7891 has a precision voltage reference, which can generate an output voltage with 2% tolerance over the full operating conditions. The Analog Devices Inc. EVAL-LTC7891-AZ is set to 500kHz switching frequency, which results in a small and efficient circuit. The converter achieves over 96% efficiency with 20A load at full operating VIN, with a peak efficiency of over 99%.
This board can be easily modified to regulate output voltages from 0.8V to 60V. The evaluation circuit has been specially designed with 100V EPC GaN FET form factor. Various FETs of similar footprint can be replaced to fit a wide array of applications.
