LP3944: about LED0-LED7 out put spec

Summer-san,

Thank you for your support.
Let me ask you one more thing.

・You taught me "Rdson of the output stage is 0.7/0.025=28R".
　Does this Rdson mean current limit resistor?

・Customer is trying to use LP3944 under the condition of VDD＜VLED.
　(VDD=3.3V,LED voltage=5V)
　Do you have a problem with this?

Best Regards,
Yusuke/Japan Disty

Hi Yusuke-San,

If VDD=5V, VLED=3.3V, LED current is 20mA.

So current limit resistor will be (5-3.3)/0.02-28=85-28=57R.

Any other question please let me know.

Thanks!

Summer

Summer-san,

Thank you for your kind support.
We would like to get your feedback following question.

・Customer is trying to use LP3944 under the condition of VDD＜VLED.
　(VDD=3.3V,LED voltage=5V)
　Do you have a problem with this?

Best Regards,
Yusuke/Japan Disty

Summer-san,

Thank you for your support.
Let me ask you one more thing about VLED and VDD.
Customer is considering VLED to start up before VDD.

Customer condition is:
VLED=5V→VDD=3.3V start up (1 ms after VLED has started up)
Is there a problem?

Best Regards,
Yusuke/Japan Disty

Hi Yusuke-San,
Could you verify it in the EVM whether is some observerable filker? If customer can accept. I think it is ok.
Any other question please let me know.
Thanks!
Summer