TPS61085: Can I use EN to set a new UVLO?

zehua hu

Part Number: TPS61085

Can I use divider resistance on EN pin to set a new UVLO? Now the UVLO is 2.2V. For example,if I want IC starts after VIN rises to 4V, can I set a 10K-pull-up and 10K-pull-down resistance on EN ?

Thanks!

over 8 years ago

0 Helen chen over 8 years ago

TI__Mastermind 40080 points

yes, you can. But there exist some tolerance. sometimes, IC can startup even when the EN voltage is lower than 2V, like 1.7V.

0 zehua hu over 8 years ago in reply to Helen chen

Intellectual 935 points

Hi Helen，
Thanks for your quick reply. I do not find this parameter from datasheet. Can you tell me the exact tolerance ? if not, the general tolerance is also OK.
Thanks.

0 Helen chen over 8 years ago in reply to zehua hu

TI__Mastermind 40080 points

Hi Hu,

Please check the following screen-shot: EN signal High minimal value is 2V, this means, when EN is higher than 2V, "all " the IC should startup. so if the customer want to make the IC startup succeessfuly, the EN signal should >=2V. But some of the IC may startup at a value low than 2V, we foudn it is 1.7V before. I'll check with the design team. if you want to control the startup precisely at Vin=4V, then extra ciruit, like the operational amplifier is needed.

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TPS61085: Can I use EN to set a new UVLO?