LM25141: Standby mode current equation

Soumya Bhat

Prodigy 150 points

Part Number: LM25141

Hi,

Can anybody tell me how to calculate standby mode current for LM25141 when the output current is given.

Regards,

Soumya

over 6 years ago

0 Samuel Jaffe over 6 years ago

TI__Mastermind 25590 points

Soumya,

The datasheet shows typically 35uA standby current consumed by the LM25141 at no load. Heavier load means the LM25141 will drive the FETs more which will consume more current. This current will depend on the FETs you choose. You can do a simulation using a WEBENCH export or by downloading the spice model from the Tools & Software tab on the LM25141 product page. This will give you more accurate results.

-Sam

0 Soumya Bhat over 6 years ago in reply to Samuel Jaffe

Prodigy 150 points

Hi Sam,

Thank you so much.

I want to check the standby current at light load, may be around 200uA. Can I specify the output current in Webenech and run the simulation to find Standby current.

Regards,

Soumya

0 Samuel Jaffe over 6 years ago in reply to Soumya Bhat

TI__Mastermind 25590 points

Soumya,

Yes, WEBENCH will give you an efficiency up to the max current specified in your operating conditions.

-Sam

Power management

Power management forum

LM25141: Standby mode current equation