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LM2664: Selection of Charge Pump Capacitor

Part Number: LM2664

I am designing a circuit for Vin = +3.3V i.e. to get -3.3V.

  1. Please tell how to calculate the value of the charge pump capacitor C1 and the corresponding value for storage capacitor C2.
  2. Is there any importance of Duty cycle in this circuit. If yes, what should be the duty cycle? Is it 50% ?