A control circuit, comprising: an input to receive a DC input signal; a first DC to DC converter to convert the DC input signal to provide a first DC output signal; a second DC to DC converter to convert the DC input signal to provide a second DC output signal; a protection circuit, including: a switch configured when a switch control signal is in a first state to connect the input to the first and second DC to DC converters, and configured when the switch control signal is in a different second state to disconnect the input from the first and second DC to DC converters (116; 120), and a protection control circuit, including a first input to receive a first sense signal that represents a voltage of the DC input signal, a second input coupled to receive a monitor signal, and a protection control circuit output to provide the switch control signal in the first state when the first sense signal is below a first predetermined threshold value and the monitor signal is in the first state; and a monitor circuit, including a second input to receive a second sense signal that represents a voltage of the first DC output signal, a third input to receive a third sense signal (VS3.3) that represents a voltage of the second DC output signal, and an output a circuit (318; 320; 322) to provide the monitor signal in the first state when the second sense signal is below a second predetermined threshold and the third sense signal (VS3.3) is below a third predetermined threshold, wherein the output circuit (318; 320; 322) is configured to provide the monitor signal in the second state when the second sense signal is greater than or equal to the second predetermined threshold or the third sense signal (VS3.3) is greater than or equal to the third predetermined threshold, characterized in that the protection control circuit is configured to provide the switch control signal in the second state when the first sense signal is greater than or equal to the first predetermined threshold value or the monitor signal is in the second state an input to receive a DC input signal; a first DC to DC converter to convert the DC input signal to provide a first DC output signal; a second DC to DC converter to convert the DC input signal to provide a second DC output signal; a protection circuit, including: a switch configured when a switch control signal is in a first state to connect the input to the first and second DC to DC converters, and configured when the switch control signal is in a different second state to disconnect the input from the first and second DC to DC converters (116; 120), and a protection control circuit, including a first input to receive a first sense signal that represents a voltage of the DC input signal, a second input coupled to receive a monitor signal, and a protection control circuit output to provide the switch control signal in the first state when the first sense signal is below a first predetermined threshold value and the monitor signal is in the first state; and a switch configured when a switch control signal is in a first state to connect the input to the first and second DC to DC converters, and configured when the switch control signal is in a different second state to disconnect the input from the first and second DC to DC converters (116; 120), and a protection control circuit, including a first input to receive a first sense signal that represents a voltage of the DC input signal, a second input coupled to receive a monitor signal, and a protection control circuit output to provide the switch control signal in the first state when the first sense signal is below a first predetermined threshold value and the monitor signal is in the first state; and a monitor circuit, including a second input to receive a second sense signal that represents a voltage of the first DC output signal, a third input to receive a third sense signal (VS3.3) that represents a voltage of the second DC output signal, and an output a circuit (318; 320; 322) to provide the monitor signal in the first state when the second sense signal is below a second predetermined threshold and the third sense signal (VS3.3) is below a third predetermined threshold, wherein the output circuit (318; 320; 322) is configured to provide the monitor signal in the second state when the second sense signal is greater than or equal to the second predetermined threshold or the third sense signal (VS3.3) is greater than or equal to the third predetermined threshold, characterized in that the protection control circuit is configured to provide the switch control signal in the second state when the first sense signal is greater than or equal to the first predetermined threshold value or the monitor signal is in the second state