Patent ID: 9660533
Date: 2017-05-23
CPC Classifications: H02M

Claim:
1. A buck-boost converter for producing a DC output voltage from a DC input voltage, comprising: a first high side driver switch coupled between a node for receiving an input voltage and a first node for coupling to an inductor; a first low side driver switch coupled between the first node and a ground voltage; a second high side driver switch coupled between a node for outputting an output voltage and a second node for coupling to the inductor; a second low side driver switch coupled between the second node and a ground voltage, wherein each of the first and second high side driver switches and each of the first and second low side driver switches further comprise a transistor having a gate control signal as an input; a control circuit for controlling the first high side switch, the second high side switch, the first low side switch, and the second low side switch and configured to operate as a buck-boost converter, and further comprising: wherein the state machine in the control circuit transitions from the buck state to the transition boost state in response to the minimum timer output, wherein the state machine in the control circuit transitions from the boost state to the transition buck state in response to the minimum timer output, wherein the state machine in the control circuit transitions from the transition boost state to the transition buck state when the hysteresis timer output is false.