LM3409: Max ILED capability

Kei Kuwahara

Part Number: LM3409

Tool/software:

Hello team,

I am wodering how much LED current does LM3409 can drive?

I understand LM3409 is controller (external FET), so it will depend on FET we use, but is it possible to drive 10A rated FET with LM3409?

Best Regards,
Kei Kuwahara

+1 Xiaoguang over 1 year ago

Yes, you can drive 10A rated FET.

0 Kei Kuwahara over 1 year ago in reply to Xiaoguang

Hello Xiaoguang-san,

Thank you.

I have one more question.
I could not find PGATE voltage on the datasheet.
Is PGATE voltage = VIN?

If so, the VGS of the MOSFET should have bigger voltage than VIN?

Best Regards,
Kei Kuwahara

+1 Xiaoguang over 1 year ago in reply to Kei Kuwahara

please note that LM3409 is driving PFET，not NFET. the driving voltage across vgs is -VCC

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