A switched-capacitor charge pump comprises a two-phase charging circuit, cross-coupled transistors connected to output nodes of the switched capacitors, and a pump output connected to source terminals of the cross-coupled transistors. The charge pump has side transistors for boosting charge transfer, and gating logic of the side transistors includes level shifters which control connections to the pump output or a reference voltage. Negative and positive charge pump embodiments are provided. The charging circuit utilizes non-overlapping wide and narrow clock signals to generate multiple gating signals. The pump clock circuit preferably provides independent, programmable adjustment of the widths of the wide and narrow clock signals. An override mode can be provided using clamping circuits which shunt the pump output to the second nodes of the switched capacitors.