Yes, but Olin is talking about _inside_ the phone. In other words, he
suspects that the phone does not attempt to directly charge the
battery from the 5V USB power but rather has a switcher in-between
which may be able to handle 4.4V or some similar lower limit.

Sean


On Mon, Dec 6, 2010 at 11:13 AM, Tamas Rudnai <tamas.rudnai@gmail.com> wrot=
e:
>>
>> I think the characteristics of LiIon have nothing to do with this proble=
m,
>> since there very likely is a switching power supply and charge controlle=
r
>> between the raw USB power input and the internal batteries of the phone.
>> =A0So
>> as long as you can produce a voltage within the normal USB range, the ph=
one
>> should take care of the rest.
>>
>
> As far as I understood solarwind does not want to put a dc-dc in his
> application, and that's where all the problems occur. In other words he
> cannot guarantee stable USB voltage level, otherwise it was too easy with=
 a
> similar way as MintyBoost.
>
> Tamas
>
>
>
>
>>
>>
>> ********************************************************************
>> Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products
>> (978) 742-9014. =A0Gold level PIC consultants since 2000.
>> --
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>>
>
>
>
> --
> int main() { char *a,*s,*q; printf(s=3D"int main() { char *a,*s,*q;
> printf(s=3D%s%s%s, q=3D%s%s%s%s,s,q,q,a=3D%s%s%s%s,q,q,q,a,a,q); }",
> q=3D"\"",s,q,q,a=3D"\\",q,q,q,a,a,q); }
> --
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