| 主权项 |
1. A step up/down switching regulator comprising:
an input terminal configured to input an input voltage; an output terminal configured to output a predetermined setting voltage, which is converted from the input voltage; a step up/down output unit configured to include
a step down switch connected between the input terminal and an input terminal of an inductor,a step down regulation switch connected between the input terminal of the inductor and a ground terminal,a step up switch connected between an output terminal of the inductor and the ground terminal, anda step up regulation switch connected between the output terminal of the inductor and the output terminal; a step up/down control unit configured to control step up/down switching; and a mode select terminal configured to receive a mode select signal to selectively set 1) a step up/down switching mode in which step up/down switching is performed and 2) a bypass mode in which the input voltage is directly bypassed to the output terminal without being subjected to step up/down switching, wherein (A) when the step up/down switching mode is set based on the mode select signal, the step up/down control unit performs step up/down switching to make the output voltage become the setting voltage so as to generate a control signal to turn on/off the step up/down output unit, and the step up/down output unit operates based on the control signal. and (B) when the bypass mode is set based on the mode select signal, the step up/down control unit generates a control signal to forcibly turn on the step down switch and the step up regulation switch so as to forcibly turn off the step down regulation switch and the step up switch which are connected to the ground terminal, so that the input voltage is bypassed out to the output terminal through the step down switch, the inductor, and the step up regulation switch from the input terminal. |
