LM5149: Application of GaN transistors in DC/DC converters

Hi Stephen,

Take a look at this ref design: https://www.ti.com/tool/PMP31349. This link is given in the LM5148-Q1 product folder, but also applies here (the LM5149 is just the LM5148 + AEF).

Were you thinking of driving GaN FETs directly or using discrete GaN + external driver or integrated GaN + driver? Note if the SW pin is grounded (as is typically the case with external drivers), you need to operate in FPWM.

Regards,

Tim