Help. Li-Ion battery voltage monitor

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Hi all,
I need a circuit or a cheap IC to monitor Li-Ion battery voltage(2.9~4.25V) continuously without additional power supply, and it would be best that its power consumption is less than 10mA. I think two methods, but there exits faulty.
1) A/D sampling. There is not precision reference, as no additional power supply.
2) Comparator. It can only complete segment montoring, but not continuous monitoring.
Can anyone give me some advices?
Thanks in advance.
 

Hi,

You do need a reference, but you can get low dropout ones (say) LT1461 2.5V version. Then you could use a resistive divider to (say) half your sample
imput voltage to 1.45v-2.125V, for the ADC or whatever you choose to use.
Maybe there are already pre-existing dedicated devices for Li-Ion (e.g. ICs which charge them, if that is what you are trying to do).
 

Thanks sky_123. It's a choice. For IC, e.g. BQ27010, it's too expensive only as voltage monitor.
Can anyone give me some suggestions about cheap ICs as voltage monitor?
 

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