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MAX3000 & Pwr On/Off Key

Altera_Forum
Honored Contributor II
‎01-01-2014 08:25 PM
1,234 Views

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
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Altera_Forum
Honored Contributor II
‎01-01-2014 09:21 PM
515 Views

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
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