I want powered GSM module from lithium battery and i want switch off from gpio Arduino to sleep power.
My VCC is 3.2-4.2V is used to powered my Arduino and GSM module. But how can I use n-channel mofset or IC to switch on/off the GSM module from gpio Arduino ?
I think about tip120 but after the voltage drop i don't have enough voltage for my GSM module.
I would like to know if exists a IC or transistor to use the same vcc for Vin and Vout , control by gpio 3.2-4.2V ?
Previous answer : Safe base resistor for TIP120
Sorry for my english i'm french Regards