Battery charger Load sharing

Discussion in 'The Projects Forum' started by deityness, Feb 16, 2013.

  1. deityness

    Thread Starter New Member

    Jan 4, 2013
    4
    0
    Hi,

    I am designing a system that controls two 3V motors uwing PWM. Power is going to be delivered bu a lithium polymer battery. So what I want to do is to be able to charge the battery at the same time that I am runnign the motors. I saw this application note from Microchip for me to be able to do this:

    http://ww1.microchip.com/downloads/en/AppNotes/01149c.pdf

    So I am at a point where I am choosing the external components of the charger. In the circuit, it requires a PMOS to switch between the battery and the wall adapter. I am confused on what specs I should be looking for a PMOS. My motors have a total start/stall current of about 1.4A, but the operating current is just 500mA. How should I choose the appropriate PMOS? Or is there any other way for me to implement load sharing?
     
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