Balancing charge pump circuits

A circuit for controlling a switched capacitor converter, comprising:

• a first comparator circuit coupled to a first current source;
• and
• a voltage divider configured to sample an input voltage and provide a reference voltage to the first comparator circuit, wherein the first comparator circuit is configured to control the first current source such that:
• the first current source draws a first current from a first terminal of an output capacitor of the switched capacitor converter upon determining that a voltage across the output capacitor is above a first threshold from the reference voltage;
• the first current source provides the first current to the first terminal of the output capacitor upon determining that the voltage across the output capacitor is below a second threshold from the reference voltage;
• and
• the first current source is turned OFF upon determining that the voltage across the output capacitor is below the first threshold and above the second threshold from the reference voltage.

A method of controlling a switched capacitor converter having a flying capacitor and an output capacitor, with a comparator coupled to a first and a second current source, the method comprising:

• upon determining that a voltage across the flying capacitor is above a first threshold from a reference voltage:
• drawing a first current from a first terminal of the flying capacitor by the first current source;
• and
• providing a second current to a second terminal of the flying capacitor by the second current source;
• upon determining that the voltage across the flying capacitor is below a second threshold from the reference voltage:
• providing the first current to the first terminal of the flying capacitor by the first current source;
• and
• drawing the second current from the second terminal of the flying capacitor by the second current source;
• and
• upon determining that the voltage across the flying capacitor is above the second threshold and below the first threshold from the reference voltage, turning OFF the first and second current sources.