Using bq2000 with USB source

Cuong Vu

Prodigy 20 points

Other Parts Discussed in Thread: BQ2000

Hi,

Can I use bq2000 /T with USB source input to charge 3 cells Nicd, NiMH, or 1 cell Li-Ion 3.7V.

Cuongdka

over 13 years ago

0 Charles Mauney over 13 years ago

TI__Mastermind 31120 points

if the cell capacity is less than 1500mA hours, otherwise the charge current will not be high enough to cause a detectable temperature rise.

0 Cuong Vu over 13 years ago in reply to Charles Mauney

Prodigy 20 points

Hi Charles,

Thank you for replying.

There is a example design in the bq2000 datasheet for 1-cell li-ion and 3 cells NiMH charger; so if I apply that circuit to my design, the source should not be USB??? Please confirm.

Is there any charger IC for multi-type battery that use the USB source that you recommend.

Cuongdka

0 Charles Mauney over 13 years ago in reply to Cuong Vu

TI__Mastermind 31120 points

The source does not matter...the point is that one has to have enough charge current to get a good termination and I recommend at least C/3 to get a good termination circuit.......so yes, USB is good for 500mA so the USB should not be used if the capacity of the cell is over 1500mAHr.

Power management

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Using bq2000 with USB source