LM49450: LM49450 Power sequence

kerr chang

Genius 4075 points

Part Number: LM49450

Hi Team

Does TI LM45450 have any power sequence requirement?

System provide 5V to LM49450 , The 5V will drop to 2.5V about 40ms.

System provide power 3.3V / 5V /2.5V to LM49450 at the same time.

If I remove LM49450 , The system power will keep 5V.

PS : I did not use LM49450 LSS/LSS*/RLS/RLS* pin. I just use HP function.

over 5 years ago

0 Ivan Salazar over 5 years ago

TI__Guru** 102045 points

Hi Kerr,

Could you provide a schematic so we can get a clear view on the system supplies?
If the power loss is on VDD/LSVDD, it is possible that the device is not able to work correctly while it goes below 2.7V

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

0 kerr chang over 5 years ago in reply to Ivan Salazar

Genius 4075 points

Hi Ivan

FYI , Please help again.

0 Ivan Salazar over 5 years ago in reply to kerr chang

TI__Guru** 102045 points

Kerr,

There should be no problem if the three different supply lines are powered at the same time.
I don't fully understand the following: "If I remove LM49450 , The system power will keep 5V."
Regarding the 5V drop, I commented on this in my previous post.
There is further information on the supplies in data sheet "Power Supplies" section: www.ti.com/.../lm49450.pdf

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

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LM49450: LM49450 Power sequence