• Another ADP2108 at +/- 1V

    Hi all,

    First of all: hobbyist here, first time using one of these switchers. I've not followed the recommended layout and possibly made some other mistakes.

    However...

    I am using an ADP2108AUJZ-3.3-R7 in a design that will be powered of a Li-ion…

  • ADP2108 Quiescent Current Question

    Dear All:

    I tested ADP2108-3.3-EVALZ and ADP2108UJ-3.3-EVALZ Evaluation Board to found if Vin=3.43V/Vout:Non-load now quiescent current is 3.4mA,but Vin=3.65V/Vout:Non-load quiescent current is 41uA, Why is there such as situation? It's the IC's …

  • ADP2108 5-Ball Contact Spacing

    The ADP2108 5-ball Wafer Level Chip Scale Package..... is the center solder ball of the device actually offset from the center of the package? Figure 36 of the data sheet shows row A-B spacing of 0.36mm and row B-C spacing of 0.5mm? What is the "REF"…

  • ADP2108-3.0 output at 1V

    Hi,

    I have the same situation as several other posters with an ADP2108-3.0 whose output sits at about 1V.  With the output at 1V, my circuit is drawing about 45 mA.

    I have added a 4.7 uF X5R 0603 input capacitor across Vin and ground, still doesn't work…

  • ADP2108-3.3 Cannot deliver more than 200mA

    I have two different boards designed for the ADP2108. After assembly, both boards seemed to be stuck at 1.0V output. The input voltage is supplied by 5V USB (measures 4.8V) with 1.0A output capability. With 2xAA batteries connected (roughly 3.2V), I would…

  • ADP2108模式切换问题

    我在使用ADP2108时发现该芯片PWM模式和连续模式的切换电流和手册上的不一样,手册上是80mA,但我实测在40mA至50mA就会发生切换,且不同芯片的切换电流不一样,一致性很差,请问这是什么原因,电路设计上需要注意什么吗,还是有批次的芯片就有问题。PS:已经过大批量测试,均如此。

    电路如下:

    除输入电容为47uF外其余均一致。

  • ADP2108 layout considerations (high frequency switching regulator layout considerations)

    Improper layout can cause some IC's not to operate correctly, as an example let’s use the ADP2108.

    The part has a 3Mhz fixed operating frequency. You will want to place the input cap, output cap and inductor as close as physically possible to the…

  • ADP2108, ADP5300, ADP5302 100% duty operation input voltage

    Hi All,

     

    One of my customer is considering to use DC-DC regulator on his prototype board.

    I recommended ADP2108, ADP530, or ADP5302 for his purpose.

    He sent me the following question.

    What is the input voltage at which the device reaches 100 duty…

  • ADP2108-3.0V outputting 1.0V (instead of fixed 3.0V)

    ADP2108AUJZ-3.0-R7

    Compact, 600 mA, 3 MHz, Step-Down DC-to-DC Converter

    Fixed Output Voltage - 3.0V


    Hello,


    I have an ADP2108 that should output a fixed voltage of 3.0V. But for some reason, it's only outputting 1.0V. I've tried using three different…

  • ADP2108 layout considerations (high frequency switching regulator layout considerations)

    Improper layout can cause some IC's not to operate correctly, as an example let’s use the ADP2108.

    The part has a 3Mhz fixed operating frequency. You will want to place the input cap, output cap and inductor as close as physically possible to the…