• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 793 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

bq2002T reference design and power path charging

Poh Leong Ng
Intellectual 745 points
Other Parts Discussed in Thread: BQ2002T

Is there a reference design for a 1-cell NiMH charging circuit using bq2002T?

Can bq2002T implements power path charging like LTC4060?

http://cds.linear.com/docs/Datasheet/4060f.pdf

The load will be connected when the battery is being charged.

Is there a more detailed application notes on how to use bq2002T?

  • 0
    TI__Guru**** 150830 points

    You can use the EVM design to power a 1-cell pack.  Just change the voltage divider to account for the lower pack voltage.  For a 1-cell pack, this would be simply removing R14 (getting rid of the divider altogether) and simply having the RC filter to the BAT input.

    There is nothing special about what the LTC4060 does to implement a 'power-path'.  This same thing can be done with the bq2002T.  Just add a diode/FET after the battery pack and add a diode in between Vin and the load.  This sort of 'power-path' is all that is possible with nickel cells as the charge current going into the cell must remain constant over the charging cycle in order to reliably detect termination.  These diodes accomplish this--the load is powered directly from the input source and the battery is isolated from the load when it is charging.  This app note discusses this is more detail: http://focus.ti.com/lit/an/slva166a/slva166a.pdf