Pages: [1]   Go Down
Author Topic: Why two regulators on Arduino Mega  (Read 662 times)
0 Members and 1 Guest are viewing this topic.
0
Offline Offline
Newbie
*
Karma: 0
Posts: 4
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Hi
Referring to the Arduino Mega and Arduino Diecimila. I would like to know why two MC33269 Voltage regulators are used in parallel?

They are also different packages. The one is in SOT223 and the other DPACK? What is the rationale behind using to different packages?

Thanks
Logged

Left Coast, CA (USA)
Offline Offline
Brattain Member
*****
Karma: 361
Posts: 17259
Measurement changes behavior
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Same answer as for the power switches. They don't populate both regulators when they build a batch, just one or the other.

Lefty

Logged

0
Offline Offline
Newbie
*
Karma: 0
Posts: 4
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Thanks
Logged

0
Offline Offline
Newbie
*
Karma: 0
Posts: 14
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Is that true for the Uno also?  Schematic shows two regulators in parallel.
Logged

Left Coast, CA (USA)
Offline Offline
Brattain Member
*****
Karma: 361
Posts: 17259
Measurement changes behavior
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Yes same situation. However new to the Uno board (and mega2560) is that there is a new additonal seperate 3.3vdc regulator to supply 3.3vdc voltage that was formally obtained from the FTDI USB serial converter chip.

Lefty
Logged

Pages: [1]   Go Up
Jump to: