Oli sayeth: Dialog D1815A 338S0867 Info from this page: http://www.isuppli.com/Teardowns-Manufacturing-and-Pricing/News/Pages/iPhon= e-4-Carries-Bill-of-Materials-of-187-51-According-to-iSuppli.aspx And this page: http://www.tgdaily.com/hardware-features/50344-the-real-iphone-4-teardown ____________________ Russell respondeth: = Detailed reports on D1815a - login and probably for money. http://www.ubmtechinsights.com/reports-and-subscriptions/open-market-report= s/Report-Profile/?ReportKey=3D6976 But if the material below is both accurate and complete it tells us enough. Buck regulators mentioned and no boost. Suggests effectively linear with switching & inductor =3D buck to improve d= own conversion efficiency (as per my prior comments). This gives useful but not vast gains when battery is low and USB input high. Re question on LiIon voltage. Std LiIon charges at constant current to Vplateau and is then charged at Vplateau with decreasing current until some terget Ilow is reached. Vplateau is set by design. Typically 4.2V. 4.3V for the brave and foolish with somewhat more capacity and perhaps prettyflames. 4.1V for the conservative with notably less capacity and notably longer cycle life. 4.0V by nobody but less and better again. As a rule, as Vplateau is reduced the capacity per cycle drops BUT total capacity/cycle x cycles rises (subject to limits imposed by other constraints such as calendar life). LiFePO4 have a 3.6V Vplateau. DISCHARGE terminal voltage for std LiIon starts at about 3.7V (soon 3.6) hence the basis for the query. LiFePo4 starts at 3.3 - 3.2V terminal. Russell >From above page: The following functional blocks will be extracted, analyzed and organized into hierarchical schematics in the Full Analog Circuit Analysis: =95 Various LDO Voltage Regulators =95 Buck Regulators =95 Battery Management Circuitry On 7 December 2010 16:37, Oli Glaser wrote: > On 07/12/2010 01:52, M.L. wrote: > > On Mon, Dec 6, 2010 at 7:45 PM, Tamas Rudnai > wrote: > >> I thought that graph was *not* from an iPhone, but some Android one? > What > >> also Olin said is that solarwind would need to measure his iPhone and > draw > >> that graphs to go any further from this point. > >> > > > > And Russell said that the iPhone 3 has a linear regulator charge > controller. > > It's hard to believe the iPhone 4 would be drastically different, > > considering the convenient 5v supply for charging the 4.2v lithium > > battery. > > Is this an iPhone4? > I was sure I'd seen a teardown of it somewhere online recently, thought > maybe that would be an idea to get info on the charging circuit if the > wish is to avoid testing with a bench supply (popular product, sure > there has to be someone that pulled it apart. > (I found out below someone has and it doesn't help much anyway...) > I have access to an iPhone 1 here I would be willing to test, but they > may have changed things since then. > I believe they have from what I discovered - I think the iPhone 1 uses > an LTC 4066 IC - info here: > http://tzywen.com/modules.php?name=3DNews&file=3Darticle&sid=3D696 > > > This page might be of interest from Lady Ada: > http://www.ladyada.net/make/mintyboost/icharge.html > Seems the Apple stuff can get very picky about the datalines (similar to > my Omnia - had to hack a charger for that, would not simply charge from > any USB source) needing voltage dividers etc. > I also found the iPhone4 uses this power management IC: > Dialog D1815A 338S0867 > Info from this page: > > http://www.isuppli.com/Teardowns-Manufacturing-and-Pricing/News/Pages/iPh= one-4-Carries-Bill-of-Materials-of-187-51-According-to-iSuppli.aspx > And this page: > http://www.tgdaily.com/hardware-features/50344-the-real-iphone-4-teardown > > Could not find a datasheet for it though, so no idea about how it works..= .. > > Looks like the bench supply test may be the only way to find out the > desired information... > > > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .