• LTC4121 is not charging


    I am currently working on a LTC4121 for the 3-Cell Li-Po solar charging. I have made my printed circuit board to test this solar charging, and I found out that it's very hard to make this chip working.

    I have tried to make my first PCB without…

  • LTC4121-4.2 model


    Is not there a simulation model for the LT4121-4.2?



  • LTC4121 as a solar charger for supercaps?

    Hi there,

    I was just wondering if it is possible to use the LTC4121 as a solar charger for supercaps?

    In my application I like to support both Li-Ion XOR supercap charging. (Little circuit modfications are ok)



  • LTC4121 Not Charging at Lower Panel Voltages

    Hi All,

    I am having an issue with a design using the LTC4121. The panels I am using have the following specs:

    • Typical voltage: 5.5V
    • Typical current: 170mA
    • Open-circuit voltage: 8.2 V
    • Maximum load voltage: 6.4V

    The LTC4121 is being used to charge a LiFePO4…

  • RE: Difference between DC1977A-A and DC1977A-B

    The DC1977A-A uses the LTC4121-4.2, and the DC1977A-B uses the LTC4121.  The LTC4121-4.2 has a fixed voltage output.  The LTC4121 has an adjustable voltage output.

  • RE: LTC4121EUD charge when Vin<12V

    Unlike the LTC4121 chip, the 4.2V fixed voltage IC (LTC4121-4.2) works well at low voltage. Only the FB resistor divider for the new chip was removed, BATSNS connected to BAT.

  • LTC 4121 not charg

    Hello ,
    I did a small board from an application example with the LTC4121 but after to many test , the LTC4121 still not charge .
    I dont understand what .. Please can give me some sugestion.

    Many thanks

  • RE: LTC4020 temperature compensation

    I have not evaluated temperature-compensation schemes for charging the lead-acid battery, but I found an article with a temperature-compensation circuit for the LTC4121 for sealed-lead-acid batteries.  You can find it at https://www.analog.com/en/design…

  • RE: LTC4121can't work if the input voltage under 15V

    We have seen strong sensitivity of the operation of the LTC4121 to the physical placement of the capacitor at IN, capacitor at INTVcc and at BOOST.  Improper placement can lead to the INTVcc voltage being pumped down by chip operation, leading to a UV…