LMG1210: When synchronous bootstrap circuit is needed

Shengnan Li

Part Number: LMG1210

Hi, we are designing 25MHz switching envelope tracking circuit with LMG1210, datasheet recommend synchronous bootstrap when lower on time smaller than 20ns. Is this just depends on time or also related to GaN gate capacitance?

over 1 year ago

+1 Ethan Galloway over 1 year ago

TI__Genius 9570 points

Hello Shengan,

It is based off time. The diode needs to recover quickly to charge the bootstrap capacitor. You might be able to use a fast recovery Schottky diode instead.

Here is some documentation on how to implement it.

Guide: https://epc-co.com/epc/Portals/0/epc/documents/schematics/EPC9066_Schematic.pdf
Example schematic: https://epc-co.com/epc/Portals/0/epc/documents/guides/EPC9066_qsg.pdf

Regards,
Ethan Galloway

Power management

Power management forum

LMG1210: When synchronous bootstrap circuit is needed