LMG5200: Parallel LMG5200's stability

Hello Kevin,

Thanks for your inquiry. As Alberto says, there are some challenges to parallel LMG5200, but it does not mean it is 100% not feasible. 

1. For deadtime, you run the risk of cross conduction between High side FET of one LMG5200 and the Low-side FET of another LMG5200. Therefore, please have the dead time setup larger than the case when switching one device. 

2.Even if the DT is large enough, the variation between parts will cause one of the LMG5200 to switch first. This device will dissipate all the cumulative Coss losses of all the other FETs that are connected to this node. Two solution: 1) to mitigate this is to split the inductor between the two LMG5200, effectively making this a multi-phase converter; 2) smaller inductors can be used to split the phases,and a single larger one to provide the DC filtering.

Hope this helps. 

Thanks and regards,

Lixing