Diode drop to step down

Mahen K · 2011-02-01T16:10:40+00:00

I have +5V regulated power supplied to my board (400Mhz CPU + DDR RAM)externally but this CPU+DDR board requires 3.8 to 4.1V to operate. Icould bring 5V down to 4V using 1N4007 + Schottky diode in series(0.65 + 0.3V drop) with a resistor parallal to ground to induce somecurrent draw so that there will be required voltage drop. Are thereany issues with this approach particularly in terms of transientresponse, Noise etc. I cannot use another LDO or DCDC regulator due tocost and board space issues.Thanks in advance-M

Feb 01, 2011 20 Replies

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Nico Coesel 15 years ago

Which CPU is on the board?

Failure does not prove something is impossible, failure simply indicates you are not using the right tools... nico@nctdevpuntnl (punt=.) --------------------------------------------------------------

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