LMG5200: Disabling the upper GaN device in the 1/2 bridge

Steve Widener

Part Number: LMG5200

What is the best way to disable the upper GaN device for lowest power consumption in an application where only the lower GaN device is needed?

over 6 years ago

0 Don Dapkus over 6 years ago

TI__Guru**** 189399 points

Hi, Steve,

Great to hear from you!

You can tie the HI pin low and that will prevent the high-side FET from switching. You can also remove the cap from HS to HB.

Let us know if you have any further questions.

0 Steve Widener over 6 years ago in reply to Don Dapkus

TI__Genius 9575 points

Ok, thanks - is there any problem shorting HB to HS & SW?

We'd leave Vin floating - correct?

Steve

0 Don Dapkus over 6 years ago in reply to Don Dapkus

TI__Guru**** 189399 points

Hi, Steve,

HS is already tied to SW internally, so that's ok. HB will need to be left floating. Will that cause an issue?

0 Steve Widener over 6 years ago in reply to Don Dapkus

TI__Genius 9575 points

The customer just wants to make sure it is in the lowest dissipation mode & no reliability concerns.

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LMG5200: Disabling the upper GaN device in the 1/2 bridge