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TL7660: TL7660 cascading connection for help

Part Number: TL7660

Hi team,

My customer is trying to use TL7660 to generating -3.6V from input 1.8V.

They try the solution using 2 units of TL7660 as datasheet Page 11, figure 6.

do you think the pin8 is connecting to Ground, or it needs to connect to Vin to achieve the voltage doubler ?

  • Hi Curry,

    For -2Vin, pin8 of the 2nd device should be grounded.  The flying capacitor voltage is reversed and superimposed on to the Pin3 voltage.  If you tie pin8 to Vin, then you will get Vout=-3Vin.

    Their Vin=1.8V, lower than 3V, then pin6 needs to be connected to pin3 for each device.  

    Hope this clarifies.

    Thanks,

    Youhao Xi, Applications Engineering