TPS54360: The Iq current is greater than 200uA when EN is smaller than 1.2V

Amelie Zheng

Part Number: TPS54360

Hi Team,

My customer now use TPS54360, they use two ways to disable TPS54360. They used Iin as Iq to judge the static power comsumption.

EN Pin to GND

In this way ,Iq is 2uA, which is the same as datasheet.

EN Pin is less than 1.2V by using two res to divided the voltage.

As datasheet's description, when EN is less than 1.2V, the BUCK is disable.

However when disable this BUCK by res divide, the Iq is very larger, nearly 200uA.

Seems the datasheet only give the Iq =2uA when EN=0V,

may I ask what the Iq is when EN is not 0V but less than 1.2V?

If I want to make sure Iq is also 2uA even by res divide, how could I achieve it?

Thanks!

over 5 years ago

0 Daniel Li14 over 5 years ago

TI__Mastermind 27470 points

1.what's the divide resistor value?

2.can customer adjust en voltage see when the Iq jump Iq from 2uA to 200uA?

Thanks

Daniel Li

0 Amelie Zheng over 5 years ago in reply to Daniel Li14

TI__Genius 10865 points

Hi Daniel.

Thanks for your reply.

1. 223K + 16 K

2. do you mean change the res proportion or keep the proportion the same and change the value of res?

0 Daniel Li14 over 5 years ago in reply to Amelie Zheng

TI__Mastermind 27470 points

Yes, change proportion of the resistor, there may have an internal EN voltage between 0 and 1.25V to turn on the internal circuit before EN reach 1.25V

Thanks

0 user5931428 over 5 years ago in reply to Daniel Li14

Prodigy 20 points

I tried to change the value of the resitor to R1 =1.3M , R2 =121K， Set up UVLO : Stop 8.1V ， Start 12.53V . Before start , the Iq is 68uA，and the datasheet show that EN = 0 , Iq =2.5uA , below 1.2V , tps54360 is diabled. in fact ，the Iq is not 2.5uA in the condition . Why and How to reudce Iq to 2.5uA.

Thanks .