Microchip Technology Incorporated
Multi-phase parallelable constant on time buck controller with phase interleaving ensured by ripple injection

Abstract:

A multiple-phase parallelable constant on time (COT) buck controller, a first phase containing a first memory bit and a second phase containing a second memory bit. The COT buck controller includes a first converter comprising a first constant T.sub.ON generator configured to sense and deliver a first T.sub.ON request when the first memory bit is in a logic one state, and a second converter connected in parallel with the first converter, the second converter comprising a second constant T.sub.ON generator configured to sense and deliver a second T.sub.ON request when the second memory bit is in the logic one state, only one of the first memory bit and the second memory bit being in the logic one state thus generating activity in a daisy chain ring where each of the first converter and the second converter senses and delivers a corresponding T.sub.ON request in a sequential manner.