Hey Alan, thanks for the tip!


LT has some nice PMICs that almost fit the requirements, but (as
expected) they are very expensive (US$8.22 @ 1, US$4.53 @ 100).
While I don't find something less expensive I will keep trying a
discrete solution.


Best regards,

Isaac



On 23/01/2015 13:58, alan.b.pearce@stfc.ac.uk wrote:
> I would check the Linear Technology web site. They make charger ICs, and =
also have an IC for controlling MOSFETs in an 'ideal diode' configuration, =
although I am not sure the latter is appropriate for this. But the charger =
ICs should be able to do exactly what you want, as it is a not uncommon req=
uirement (cell phones etc).
>
>> I need to design a mobile equipment operated by an 1-cell Li-Ion battery=
..
>> I want the equipment to be able to charge and operate simultaneously whe=
n
>> connected to a power supply and operate on battery power when not
>> connected.
>>
>> Some restrictions:
>> 1) I cannot afford the Vf drop of a diode from the battery to the circui=
t;
>> 2) When the circuit is charging and power is suddenly removed, it must
>> continue operating without any interruption;
>>
>> I devised the attached circuit (PDF). I hope it performs as expected.
> ...
>
>
>
>



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