Patent ID: 6785180
Filing Date: 2004-08-31
Classification: G11C,H02M

Abstract:
A programmable soft-start control for a charge pump configured to provide a voltage output, a charge-off signal output when the voltage output is below a target voltage, a programable clock input to provide PFM control of the charge and discharge phase, and charge-strength selector inputs which set a voltage ramp-up rate of the voltage output, said soft-start control comprising:a charging-series circuit coupled to the charge-off signal output and the charge-strength selector inputs of the charge pump, said charging-series circuit is configured to provide turn-on outputs to the charge-strength selector inputs; and at least one frequency selector circuit configured to provide a clock pulse output that is used by said charging-series circuit for a specific soft-start condition of the charge pump, said at least one frequency selector circuit is programmed to select a frequency of said clock pulse output.