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bq2407x
Related Posts

  • Forum Post: Re: BQ24075 and battery protection

    Chris Glaser
    No, there is no low battery comparator inside of the charger IC to disable the BAT to OUT FET. The bq24075 is designed to always provide power to the system if it can. Typically, inside battery packs is a pack protector that monitors the voltage and current of the pack. These typically cutoff at 2...
    on Aug 18, 2010

  • Forum Post: bq24072 charge current problem

    Steve Lyon
    Hi, I am using the bq24072 linear battery charger IC and seem to be experiencing an issue relating to charge current. I wanted to charge at 450ma so I set Riset=2k, and an overall current limit of 1A so set Rilim=1.5k, but I am only seeing 180ma going into the battery as measured with a DMM. This...
    on Aug 31, 2010

  • Forum Post: Re: bq24072 - Setting Current Limit

    Chris Glaser
    I believe table 1 in the datasheet answers your question. The EN pins control a mux that selects from 1 of 4 input current limit settings: fixed USB suspend operation, fixed 500 mA current limit, fixed 100 mA current limit, or current limit adjustable by the ILIM resistor. The block diagram on page 8...
    on Sep 21, 2010

  • Forum Post: Re: bq2403x or bq2407x

    Chris Glaser
    The IC has 2 means to maintain the output voltage. The first is by reducing the charging current, if the output voltage drops below the DPPM setpoint. The battery is still being charged, but with a reduced current. The output voltage is maintained at the DPPM setpoint. If the output voltage drops...
    on Oct 24, 2010

  • Forum Post: Re: BQ24079 Out

    Chris Glaser
    You are correct in your thinking. Since your 5V input is less than the regulation voltage of 5.5V, the voltage on the OUT pin will not be 5.5V, but will be less than 5V. How much less will depend on your load. The IC will try to regulate the OUT pin to 5.5V by turning Q1 on all the way--passing the input...
    on Dec 12, 2010

  • Forum Post: BQ24079 Out

    MarcosCba
    Normal 0 21 false false false ES X-NONE X-NONE MicrosoftInternetExplorer4 ...
    on Dec 12, 2010

  • Forum Post: Re: bq24079 OUT pin creating +/-5V supplies

    MarcosCba
    Normal 0 21 false false false ES X-NONE X-NONE ...
    on Dec 13, 2010

  • Forum Post: Re: Suspend mode - bq2407x

    Chris Glaser
    I believe your question is answered on page 18 and 19 of the datasheet: Sleep and Standby Modes The bq24070/1 charger circuitry enters the low-power sleep mode if the input is removed from the circuit. This feature prevents draining the battery into the bq24070/1 during the absence...
    on Dec 14, 2010

  • Forum Post: bq24079 OUT pin creating +/-5V supplies

    MarcosCba
    Chris: Hi, Thanks for your fast answer! Here is the thing… I’m implementing a circuit feed by a Li -Ion battery (3.7V / 850mAh). This battery should power a circuit that needs -5/+5 [V] source and consume less than 200mA. I use BQ24079 for charging the battery form USB port. As BQ24079...
    on Dec 12, 2010

  • Forum Post: how low can the bq2407XT series constant current go?

    stanc
    I am interested in charging a small li-ion battery at 100mA constant current phase. From the data sheet using typical Kiset of 890, the Riset I need is 8.9K. The problem is that the data sheet also says that Riset must be in the range 590 to 3k. If I use 8.9k for example, will this work? What...
    on Jul 13, 2011

  • Forum Post: Re: BQ24072 USB Input Problem

    Charles Mauney
    It should probably be done dynamically. The part does come up in 100mA mode to check for shorts and runs some routines but changes to the EN2/1 setting soon after it is finished with the power up. If you want it to stay in 100ma mode, then you need to set EN2/1 to 0/0.
    on Aug 15, 2011

  • Forum Post: bq24075 system connection

    Ivan Pivovarov
    We're looking for using bq24075 in our application, but it has 6.5 mcA sleep current (I BAT(POWN) ) that is comparable to system power consumption in sleep mode. Is this value for SYSOFF pin low and what current will be with SYSOFF high? Is it possible to connect system load or just part of it...
    on Aug 29, 2011

  • Forum Post: bq2407x & bq2407xT: differences?

    Anonymous Anonymous
    Hi, I would like to ask a question on bq2407x and bq2407xT series. What is the chief difference between these two series? According to their respective datasheets: bq2407(2, 3, 4, 5, 9) SLUS810G bq2407(2, 5, 9)T SLUS937A Besides...
    on Nov 6, 2011

  • Forum Post: bq2407x: CAD files?

    Anonymous Anonymous
    Hi, A quick question is with the bq2407(2,3,4,5,9) family devices: is there any supporting footprint and/or schematic source for downloading? I looked at the respective webpages but didn't find any. Are they available or not? Zheng
    on Nov 21, 2011

  • Forum Post: bq24075 Vout drops to 4.0V at 1.5A load

    Naji Naufel
    I have a 5.14V @ 2.5A wall wart connected to the bq24075EVM and a 2600mAh Li-Ion battery. I need to be able to drive a 2A load. I see that the AC path (Iin) can only provide 1.5A and that the battery can supplements the rest (up to a theoretical 4.5A). At 0A load, Vout = 5.10 At 2.47A load (1 Ohm...
    on May 15, 2012

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