CSD23280F3: Schematic and Layout review Request

Hello Pragash,

Thanks for your interest in TI FETs. Apologies for the delay. I missed your earlier private message. I can only review the FET (Q1) circuit as that is my area of responsibility and expertise. The Q1 schematic looks OK except for R1, a 0Ω resistor pulling the SENSORS_EN signal to GND. This will force the FET on. Not sure if this is your intention. R27 the 100kΩ resistor pulls the gate up to the source (3.3V) and makes sure the FET is off if the SENSORS_EN signal is open. Pulling SENSORS_EN signal to GND should turn the FET on if R1 is not populated.

Best Regards,

John Wallace

TI FET Applications

hi john,

i replied you in PM. 

Thanks Pragash. I will review.

John

John Wallace1, can you please check your PM? thanks. 

Hi Pragash,

Thanks for reminding me. I missed this one. What is the reference designator for the switch?

Thanks,

John

Reference designator is Q1

John Wallace, does that mean the switch will be able to operate stably to switch ON and OFF the high power LTE Modem as in my schematic? I just wanted to verify. Moreover, the input voltage to the switch varies from 3V to 4.2V as it's shorted to the battery voltage. 

Hi Pragash,

I'll respond on PM.

Thanks,

John

THANKS John Wallace1

John Wallace1, I have asked some questions about your answers. Please help answer them. Thank you so much. 

THANKS John Wallace1. i started understanding things better. i have follow on comments and questions. please help to clarify them as well. so the switch can still work reliably in open drain (ON) and high impedance (OFF) correct? only problem is logic will not work.