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BQ2002T: Suggest Charger circuit For BQ2002T

Prodigy 60 points

Replies: 4

Views: 50

Part Number: BQ2002T

Hi All

Hope all are fine

BQ2002T how can we set chargine current or it has inbuilt fast charging means what is the charging rate ?

Either the charging current is adjustible or fixed 

My specifications 

Input : 5V 500mA  USB

Battery: 2 cells NImh 1.2V /800 mAh

Charging current expected : 0.5C 

Termination Style: Change in temperature /Cahnge in voltage 

Can you guys give me a better circuit or recommend an IC which meets above specs in TI 

4 Replies

  • Hi Anand,

    An example circuit for BQ2002T can be found here https://www.ti.com/lit/ug/sluu007b/sluu007b.pdf?ts=1594405120778

    The charge current is set by the LM317 through R7. Battery voltage is set through resistor divider on the BAT Pin. This can be made to work for 2-cell operation, see section "Battery Voltage and Temperature Measurements" of d/s

    Best,

    Nick Brylski

    Applications Engineer

    Texas Instruments

  • In reply to Nick Brylski:

    Thanks for the reply 

    My doubt in the above circuit diagram 

    What is above output voltage and output current for LM317 

    And which resistor we need to adjust for the required output voltage .

  • In reply to Anand Sands:

    And How the CC pin controls the charging current 

  • In reply to Anand Sands:

    Anand,

    R7 sets output current of LM317, Battery voltage is set by R9/R14. 

    The LM317 section of this circuit does not need to be modified to work for 2 cell. Only need to change R9 to 101k.

    Best,

    Nick Brylski

    Applications Engineer

    Texas Instruments

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