TPS61288: TPS61288RQQR: pin enable by default

Hi Yolanda,

the EN is used to enable the device, I assume that you need the device always on?

you can connect this pin to Vin, please be noted that EN's max voltage is only 6V, you can use resistor divider.

Best Regards

Fergus

I want to turn on the device by default but I have an external connector to supply loads so I want to turn off device when external supply is on with a control signal. Probably, it is not needed to disable device because we have implemented a power mux but just to be sure we were thinking to pull-up enable pin to input pin which is 3.3V and, at the same time, to connect enable pin to control signal by a 0 ohm resistor to disable TPS61288 when external supply is enable. This is the circuitry I'm talking about:

Hi Yolanda,

the circuit is acceptable, please ensure the EN signal is open-drain.

also, please be careful that when EN is low, the device shutting down, the device's output will be same as Vin because of the body diode of upper mos.

Best Regards

Fergus

No, EN signal is an input so I realize I have to connect it to vin pin by a 0 res ohm and if I want to control it by the control signal to remove this resistor and assemble the 0 ohm resistor which connect EN pin with ENA_BOOST signal, right?