Charge pumps with current sources for regulation

A charge pump circuit configured for regulating an output voltage, said charge pump circuit comprising:

• an input supply voltage;
• a charging capacitor configured for providing a stored voltage charge;
• a reservoir capacitor configured for receiving the stored charge from said charging capacitor to provide said output voltage;
• and
• a first current source comprising a first current limited switch connected between said input supply voltage and a first plate of said charging capacitor, said first current source being configured to control a discharging current in said charging capacitor to reduce voltage ripple occurring in the output voltage;
• and
• a second current source comprising a second current limited switch connected between said input supply voltage and a second plate of said charging capacitor, said second current source being configured to control a charging current in said charging capacitor to reduce inrush current occurring within said charge pump circuit.

An integrated circuit having an output terminal, said integrated circuit having a charge pump circuit configured for regulating an output voltage at the output terminal, said charge pump circuit comprising:

• an input supply voltage;
• a charging capacitor configured for providing a stored voltage charge;
• a reservoir capacitor configured for receiving the stored charge from said charging capacitor to provide a regulated output voltage;
• and
• a first switched current source connected between said input supply voltage and a first plate of said charging capacitor, said switched current source being configured to control a discharging current in said charging capacitor through switching frequency regulation in said charge pump circuit, and thus facilitating reduction of voltage ripple occurring at said regulated voltage reference;
• and
• a second switched current source connected between said input supply voltage and a second plate of said charging capacitor, said second current source being configured to control said charging current in said charging capacitor to reduce inrush current occurring within said charge pump circuit.

A charge pump circuit configured for providing an output voltage, said charge pump circuit comprising:

• an input terminal for receiving a supply voltage;
• a charging capacitor configured for providing a stored voltage charge, said charging capacitor having a first plate and a second plate;
• a reservoir capacitor configured for receiving the stored charge from said charging capacitor to provide said output voltage;
• said reservoir capacitor being coupled to said second plate of said charging capacitor through a switch device;
• and
• at least one current source coupled between said input terminal and at least one of said first plate and said second plate of said charging capacitor, said at least one current source being configured for controlling a charging current flowing into said charging capacitor and for controlling a discharging current flowing from said charging capacitor to said reservoir capacitor to reduce voltage ripple and inrush current occurring at said output voltage.