TPS65266: please help confirm whether the EN pin can be conncected to VIN directlly, thanks.

user5324035

Intellectual 290 points

Part Number: TPS65266

limited by the area of PCB, we plan connect EN to VIN directly, without any resistor, is it OK or not? thanks

over 5 years ago

0 Sam(MPAA) Zhang over 5 years ago

TI__Mastermind 19080 points

Hi,

As the absolute maximum voltage on EN and VIN are both 7V, it's OK to tie them together.

Thanks!

Regards,

Hao

0 Sam(MPAA) Zhang over 5 years ago

TI__Mastermind 19080 points

Hi,

This device has internal pull up current source on ENx. (You can refer to the block diagram on Page 13, datasheet) So, we prefer to leave ENx
floating when there is limited PCB solution size.
By the way, please be acknowledged that by leaving ENx floating or connecting ENx to VIN, 3 channels will power up at the same time.

Thanks!

Regards,
Hao

0 user5324035 over 5 years ago in reply to Sam(MPAA) Zhang

Intellectual 290 points

so, If we want to control the EN, we must add a pull down resistor, am I right? and what the value of this resistor is?

0 Sam(MPAA) Zhang over 5 years ago in reply to user5324035

TI__Mastermind 19080 points

Hi,

What kind of EN control do you want?

Regards,
Hao

0 user5324035 over 5 years ago in reply to Sam(MPAA) Zhang

Intellectual 290 points

Our Control as below:

1, Power on VIN1~3 and EN1,3 at same time.

2. power on EN2 by other GPIO if need VOUT2 working.

Since EN being pulled up internally, we need add a pull down resistor to GND for EN2, am I right? what the suggested value of this resistor for pulling down is?