MOSFET that works with Lipo (3v-4.2V)

[Amalinda]

Can somone please recomend me a MOSFET IC that turn on fully when 3.0V is supplied with a good Ron value such as less than a couple of ohms?

 

[crutschow]

N channel or P channel?

 

[dick_freebird]

An EPC enhancement mode GaN FET will be well driven at
that kind of Vgs - not fully, but sub-100mOhms. Maybe a
better option for you. Provided that you need <= 200V
BVdss.

But it's not clear to me what you're really after - a single
MOSFET, an IC, an IC to drive MOSFETs?

 

[Amalinda]

I want to switch ON a load that can have burst currents on 2.5A using a microcontroler. the MOSFET i used is not functioning properly. the voltage drop is too high when I switch it ON. Is there a special circuitry to be used without directly connecting the GATE of the MOSFEt to the ucontroler?
and what is the MOSFET I should use here.
the load is basically a SIM908 which will request for burst currents of 2-2.5A and most of the time the load is off

 

[FvM]

I'm using Si2323 (PMOS 20V/6A/50 mOhm, SOT23 case) for similar applications. Lower Rdson transistors are available in Micro8 and SO8.

Major manufacturers have parametric search to easily find suitable types.

 

[Amalinda]

Hey can you pls advice me of a support circuitry? the one I had I connected the GATE to the MCU and the MCU heats a lot. GATE and SOURSE directly to the Power accrosos the load to GND.

However when I do this, I get about 1.5V less than the supply voltage(3.8V Lipo) at the load. Anyone has a sollution?
should I use a mechanical relay?
May be an IGBT?
is 3.8V at the gate not enough to bias is properly?

 

[Jibby Benjamen]

Z44 is the Mosfet