METHOD, APPARATUS AND SYSTEM FOR A CHARGE PUMP WITH A SINGLE CAPACITOR AND MULTIPLE OUTPUTS

摘要

A circuit with a single capacitor and multiple outputs. The circuit reuses the same flying capacitor to charge multiple rails by timing the charging cycle sequentially, where the one rail is charged and then the charge pump switches to deliver power to the second rail.

主权项

1. A circuit with a single capacitor and multiple outputs, comprising:
−AVDDL, AVDDH, 6 switches S1-S6, 3 capacitors C1-C3, and 2 Loads; wherein AVDDL is grounded on one side and coupled to S1 on the other; S1 is coupled to S2, S3 and C1 on one side and to AVDDH and S5 on the other; C1 is coupled to S1, S2, and S3 from one side and to S4, S5 and S6 on the other; S2 is coupled to −AVDDL and S4 on one side and S1, S3 and C1 on the other; −AVDDL is coupled to S2 and S4 on one side and grounded on the other; S3 is coupled to S1, S2 and C1 on one side and C2 and Load 1 on the other; S4 is coupled to S2 and −AVDDL and S5, S6 and C1 on the other side; S1 is coupled S1 and AVDDL and, on the other side, S4, S6 and C1; S3 is coupled to S1, S2 and C1 on one side and C2 and Load 1 on the other; S6 is coupled to S4, S5 and C1 on one side and C2 and Load 2 on the other; C2 is coupled to S6 and Load 2 on one side and on the other side to Ground; C3 is coupled to S3 and Load 1 on one side and on the other side to Ground; Load 1 is coupled to ground on one side and S3 and C3 on the other side; and Load 2 is coupled to ground on one side and S6 and C2 on the other side.