1 Cell LiPo / Li-ion Battery Charger CC&CV




Hi there. I would like to show you guys the smallest and simplest single cell Li-Ion & LiPo battery charger pack with all the necessary functions. Detail as follow. Description from its spec. The XC6802 series is a constant-current/constant-voltage linear charger IC for single cell lithium-ion batteries. The XC6802 includes a reference voltage source, battery voltage monitor, driver transistor, constant-current/constant-voltage charge circuit, over heat protection circuit, phase compensation circuit. The battery charge termination voltage is internally set to 4.2V ±0.7% and the trickle charge voltage and accuracy is 2.9V ±3%. In trickle charge mode, a safe charge to a battery is possible because approximately 1/10 out of setting charge current is supplied to the battery. With an external RSEN resistor, the charge current can be set freely up to 800mA (MAX.), therefore, the series is ideal for various battery charge applications. The series charge status output pin, /CHG pin, is capable of checking the IC’s charging state while connecting with an external LED. Data sheets can be downloaded from this URL http://www.torex.co.jp/english/search/index.php. Enjoy.......


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    10 Discussions


    3 years ago

    @SAGUTRIC Nice one, but can I put 3x in paralell on it to charge or only 1x cell?


    8 years ago on Introduction

    what will happen when input voltage increase above 6v. i have read all about this ic i am very interested to use this ic in my product but i want to know this. this is not in datasheet. i hope ic will shutdown when Voltage increase above 6V. Pls let me know.

    1 reply

    Reply 3 years ago

    The datasheet states that 6.0V is the upper limit of the operating voltage. As is with any IC, operating above the upper limit can, and probably will, result in damage to the IC. This is scary because the damage could go unnoticed and result in a Li cell exploding. You can build a voltage regulator circuit fairly easily using a 7805 voltage regulator, or even a simple zener diode. Furthermore, you could arrange a comparator circuit to sense the supplied voltage and pull the ISEN pin high when it exceeds 6V as to activate the chip's shutdown condition.



    7 years ago on Introduction

    Nice chip, I have 6 li-ion in serial (~24V) in a box. I'm wondering if I can use those kind of chip to charge each individual cell without any issue.


    7 years ago on Introduction

    do they make a version of this for a higher charge rate, like mybe 10 amps or so?


    8 years ago on Introduction

    * Could you please list the parts you used ?
    * you didn't include temperature control .. do you depend on Protection pcb ?

    Charging it from USB, aren't you risking overdrawing the current from the port? If the thing can deliver 800mA at 2.9V, is it efficient enough to do so without exceeding 500mA at 5V?

    2 replies

    Hi there. Thanks for your interest in this charger. If you review the spec carefully, you can set the charging current by setting the resistor (Rsen) value. Base on the spec, pg 8. Rsen=1.25K will give you 800mA of charging current. Rsen=10K will give you 100mA of charging current. I am using Rsen=5.6K which is about 180mA of charging current. I am limiting the current drawn from USB to ~ 180mA. This is pretty safe for USB. Hope it answer your question. Cheers.