Thank you all.
It was hard to understand what at least resulted simply once one have learnt the basics of transistor.
My issued where only if my project specs were suitable for that kind of IC's family and don't care about the voltage transistor drop (Vcesat).
I tested all and had theese results:
3.7Vin (lipo battery) -> 2.7V on micropump, sucking 150mA (1V drop).
Quite similar results with 3V AA battery.
