I have an issue I need to resolve quickly. We have a product that needs a last gasp feature. It needs to supply on average 100mA for 90 seconds with current peaks of up to 300mA for 10-100mS maybe 5 times during the 90s, the voltage can never dip below 3.3V. I was planning on using a supercap, currently we have the Vishay p# MAL219690211E3, see attached, but I think I need some type of DC to DC converter/charge to manage the whole process. It needs to take in either 5V or 10-30V and output a regulated 3.8V @ 0.5A or better, when external power goes away, the super cap needs to take over supplying 3.8V for 90 seconds at the current levels listed previously. I could be easily persuaded to use a rechargeable battery as well if that is easier, plus the super cap has a long lead time. Any help is appreciated. An exampled of what I am looking for, this is from Vishay, was to use the LTC3355, just wondering what options TI has(Please visit the site to view this file).
Thanks.