On Thu, October 17, 2013 4:24 pm, Dwayne Reid wrote:
> Good day to all.
>
> I've just been handed a project to re-do.  It currently uses an
> On-Semi NCP1835 Li-Ion battery charge chip in a DFN package.  It
> looks as if the chip is now obsolete (On-Semi says that the last ship
> date was last year).
>
> They are currently using a single-cell cell-phone battery pack
> (Li-Po) rather than Li-Ion but I assume that the charging profiles
> are similar, if not identical.
>
> I'm looking for a similar charge chip.  Battery capacity will be
> somewhere between 1000 MaHr to 3000 MaHr - probably in the 1000 MaHr
> range.
>
> Although there now appears to be hundreds of chips to choose from,
> I'm seeking a recommendation for one that is both easily sourced as
> well as being easy to solder (soic, SC-70, etc.  I'd prefer not to
> deal with DFN package and really don't want to mess with a BGA device.
>
> I have no idea how far this project will go - volume could be as low
> as a few prototypes all the way up to several hundred units.
>
> All suggestions greatly appreciated.

Hi Dwayne,

Of course, since this is the PIC list, and I have a bias towards
Microchip, what about the MCP73831/2 or MCP73113/4? - both of these are
available in DFN, and the MCP73831/2 is also available in SOT-23 - there
are also PIC based solutions available, check out
http://www.microchip.com/pagehandler/en-us/technology/batterymanagement/

The DFN is kind of hard to avoid as you get to higher power- you need the
heatsinking, but I understand your trepidation. With hot air and good
solder paste, I've found my bias against them is mostly just unfounded
anxiety.

Regards,

Matt

Matt Bennett
Just outside of Austin, TX
30.51,-97.91

The views I express are my own, not that of my employer, a large
multinational corporation that you are familiar with.
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