Hi,
We're trying to figure out how to charge a Li-ion battery 3.7v from a source that's only about 0.4v and able to supply a constant 40-70mA of current. Would a charge pump be able to do this for us? Of course, it would be intermittent, but I could imagine ramping up a voltage greater than 3.7v, applying it to the baterry, reset, and do this over and over again.
Any thoughts out there? Has this been done before? Anybody have an off the shelf chip they know about?
Thanks,
Brian
brian04@(nospam)audionce.com
We're trying to figure out how to charge a Li-ion battery 3.7v from a source that's only about 0.4v and able to supply a constant 40-70mA of current. Would a charge pump be able to do this for us? Of course, it would be intermittent, but I could imagine ramping up a voltage greater than 3.7v, applying it to the baterry, reset, and do this over and over again.
Any thoughts out there? Has this been done before? Anybody have an off the shelf chip they know about?
Thanks,
Brian
brian04@(nospam)audionce.com