Techniques are described that can solve the problem of being low power while running a device on battery and alternatively running on the output of a switching regulator. In a low power mode, a voltage regulator circuit can be powered down and a switch can connect an input voltage of the regulator, e.g., a battery, to the CPU. In addition, internal and/or external loads, such as voltage feedback resistors, can be disconnected in order to further reduce the power consumption. If the device is going into operation, the CPU can be disconnected from the input voltage of the regulator, e.g., the battery, and switched to the output of the regulator. This can ensure that the circuit consumes very little power consumption in standby mode.