Balancing Techniques and Circuits for Charge Pumps

A circuit for pre-balancing a switched capacitor converter, comprising:

• a first comparator comprising:
• a positive input configured to receive a voltage across an output capacitor;
• a negative input configured to receive a first hysteresis voltage;
• an enable input operative to receive an enable signal;
• and
• an output coupled to a first current source;
• a second comparator comprising:
• a positive input configured to receive a voltage across an input capacitor of the switched capacitor converter;
• a negative input configured to receive a second hysteresis voltage;
• an enable input operative to receive the enable signal;
• and
• an output coupled to a second current source, wherein:
• the first current source is coupled between the output capacitor and GND and is configured to discharge the output capacitor upon determining that the voltage across the output capacitor is above a tolerance provided by the first hysteresis voltage, and
• the second current source is coupled between the input capacitor and GND and is configured to discharge the input capacitor upon determining that the voltage across the input capacitor is above a tolerance provided by the second hysteresis voltage.