Circuit for reducing output voltage undershoots during switching of LDOs

The invention discloses a circuit for reducing output voltage undershoots during switching of LDOs. The circuit comprises a first LDO, a second LDO and a first voltage adjusting module. The output end of the first LDO and the output end of the second LDO are electrically connected and are taken as the output end of the circuit; the first end of the first voltage adjusting module is electrically connected with the output end of the first LDO, and the second end of the first voltage adjusting module is electrically connected with the feedback end of the first LDO; stable output voltages of the first LDO are first work voltages, stable output voltages of the second LDO are second work voltages; and when output voltages of the circuit need to be converted from the larger first work voltages into the smaller second work voltages, after the first voltage adjusting module reduces the output voltages of the first LDO to first preparation voltages, the second LDO starts working, and when the output voltages of the circuit are greater than the first preparation voltages, the first LDO is closed. According to the circuit provided by the invention, when the LDOs are switched, the amplitude of output voltage undershoots of the circuit is greatly reduced.