My goal is to design a USB charger for my phone/tablet when I don't have access to the power grid. I've used a LM317 with a 12 V, 5 A·h SLA battery but it does not provide enough capacity due ...
For my Super OSD project, I need a +3.3V supply at 250mA from a variable input of 5.5V to 20V. Cost is a concern, as is size. Originally, I considered an LM317 in a SOT-223 package, due to the small ...