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Altera_Forum's avatar
Altera_Forum
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12 years ago

MAX3000 & Pwr On/Off Key

Hi,

I want to use a MOSFET or may be bipolar transistor key to switch power supply ON/OFF for MAX3000 EPM3032

May such decision cause some problems?

Clock frequency is not high - about 2MHz,

and state of logic in power off mode is not disturbed.

And what is better here - MOSFET or bipolar transistor?

As I understand, EPM3032 consumes about 30mA when it doesn't work.

I wouldn't like to add separate controlled voltage stabilizer for EPM3032

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    12 years ago

    Using a MOSFET should be fine, you need to make sure you keep the MOSFET within its safe-operating-area during turn-on/off.

    You could also consider using a USB power switch, such as the Texas Instruments TPS2051B. USB power switches have soft-start control, over-current output indicator, and they keep their internal MOSFET within its safe-operating-area.

    USB power switches are useful for power-sequencing without having to use separate linear regulators. Though I would recommend comparing the price on the MOSFET vs switch vs linear regulator.

    Cheers,

    Dave