EVAL-LTC7891-BZ

Product Details

The evaluation circuit EVAL-LTC7891-BZ features the LTC^®7891, which is a 100V capable step-down synchronous gallium nitride (GaN) field effect transistor (FET) controller. In this application, the IC is optimized with 40V GaN FETs to operate within the 15V–36V input range at 800kHz. The LTC7891 is specifically designed to drive GaN FETs safely and easily through internally optimized bootstrap switches and smart dead time control. Split gate drivers allow FETs to be turned on or off easily. Additionally, the IC features low I_Q, up to 3MHz programmable/synchronizable switching frequency, spread spectrum, and a small 28-lead (4mm x 5mm) side wettable QFN package. These features promote a wide variety of applications, including industrial, military, medical, and telecommunications systems.

The EVAL-LTC7891-BZ operates from a 15V–36V input range and generates a maximum 12V, 25A output. The LTC7891 has a precision voltage reference that can generate an output voltage with 2% tolerance over the full operating conditions. The EVAL-LTC7891-BZ is set to 800kHz switching frequency, resulting in a small and efficient circuit. The converter achieves over 97% efficiency with 25A load at full operating V_IN, with a peak efficiency near 99%.

This board can be easily modified to regulate output voltages from 0.8V to 15V. Various FETs of a similar footprint can be used to fit an array of applications. An alternate molded core inductor footprint can be utilized for lower-profile designs. For higher input voltage applications, refer to the EVAL-LTC7891-AZ version designed for wider input and output voltage ranges at a lower switching frequency.

The EVAL-LTC7891-BZ provides a high-performance, cost-effective solution for generating a 12V output. The LTC7891 data sheet gives a complete description of the part, its operation, and application information. Use the data sheet in conjunction with this user guide.

Design files for this circuit board are available at www.analog.com.