Quiescent current of Battery charger IC

Thread Starter

Mahantesh Teli

Joined Apr 2, 2016
21
Hi,
I want to understand how quiescent current is measured Ex Dc Dc battery charger IC, if Iq is 1.5mA during charge mode; Does this mean 1.5mA, device will consume per hour? Or how. ?

Plz educate me.

Thanks
 

Ylli

Joined Nov 13, 2015
771
1.5 mA is not a quantity, it is a rate. The IC draws 1.5 mA to power it's internal circuits.
 

Thread Starter

Mahantesh Teli

Joined Apr 2, 2016
21

#12

Joined Nov 30, 2010
18,076
to be clear on this. You meant IC draws 1.5mA of current per hour.
No, it draws 1.5 milliamp hours per hour.
1.5 ma x 1 hour = 1.5 ma-hours

What if battery contains 1000 MaHr?
Then 1000 MaHr/1.5 MaHr = 666.66 hours.
 

#12

Joined Nov 30, 2010
18,076
Thank you... can you please educate me how does Iq matters to battery charger IC.
Iq doesn't relate to anything important unless you are charging one battery with another battery.
The Iq comes from the wall outlet and the battery never knows about it.
 

Ylli

Joined Nov 13, 2015
771
Hi Ylli,

Thank you , to be clear on this. You meant IC draws 1.5mA of current per hour.
NO. It draws 1.5 mA of power. If it is turned on and allowed to draw that 1.5 mA for a hour, then it has used 1.5 mA-hr of energy. If it is on for 100 hours, then it will have used 150 mA-hr of energy.

That 1.5 mA is a rate, not a quantity. 1.5 mA is equivalent to about 9.3 x 10^15 electrons/second.
 

Thread Starter

Mahantesh Teli

Joined Apr 2, 2016
21
Iq doesn't relate to anything important unless you are charging one battery with another battery.
The Iq comes from the wall outlet and the battery never knows about it.
But when the application is small power bank applications then ?
 

Thread Starter

Mahantesh Teli

Joined Apr 2, 2016
21
NO. It draws 1.5 mA of power. If it is turned on and allowed to draw that 1.5 mA for a hour, then it has used 1.5 mA-hr of energy. If it is on for 100 hours, then it will have used 150 mA-hr of energy.

That 1.5 mA is a rate, not a quantity. 1.5 mA is equivalent to about 9.3 x 10^15 electrons/second.
Thank you Ylli: )
 
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