I'm using MSP430F2274 which needs a power supply of 1.8V - 3.6V.
I have a computer charger which gives 19V and maximum 1.5A. I regulate (correct word?) that with L7812CV down to 12V which I then use in a motor controller. I then regulate those 12V to 5V with L7805CV and use a voltage divider with 4.7kΩ and 9.4kΩ to get it down to 3.3V (I have some capacitors also connected just in case)
When measured without the MSP430 connected, it is just as predicted, 3.3V across. But when I connect the MSP430, it drops down to 1.04V which the MSP430 doesn't run on.
Someone suggest me to use LM317, and I have check it online and found some datails about it. From the details(http://www.kynix.com/Detail/799868/LM317.html) ,do you think it is OK?
Any suggestions on what could be wrong? Thanks very much.