DC-DC converter system, DC voltage supply system and printed circuit board for a DC-DC converter system

A DC-DC converter system (1, 1′), including:

• an input (In) for feeding in an input voltage (U_in);
• and
• a step-up controller section (2) for increasing the input voltage (U_in) in a controlled manner to a controlled first output voltage (U_out1) and for providing the first output voltage (U_out1) at a first supply output (Out1), wherein the step-up controller section further comprises a series circuit of a first inductor (L1) and a first diode (D1), which are electrically interconnected at a first interconnection point (P1), wherein the first diode (D1) is arranged with its forward conducting direction from the first interconnection point (P1) to the first supply output (Out1), and comprises a control device (S1) and a switching device (T1), which is controllable by the control device, for the controlled opening and closing of an electric connection between a first contact point (K1) of the switching device and a second contact point (K2) of the switching device (T1), wherein the first contact point (K1) of the switching device is electrically connected to the first interconnection point (P1), and the second contact point (K2) of the switching device is electrically connected to ground directly or via a first resistor (R1),
• wherein the DC-DC converter system (1, 1′) further comprises a voltage conversion section (3) for converting the input voltage (U_in) in a manner controlled by the control device (Si) to a second output voltage (U_out2) and for providing the second output voltage (U_out2) at a second supply output (Out2), wherein the voltage conversion section (3) comprises a series circuit of a second inductor (L2) and a second diode (D2), which are electrically interconnected at a second interconnection point (P2), wherein the second diode (D2) is arranged with its forward conducting direction from the second interconnection point (P2) to the second supply output (Out2), and comprises a coupling capacitor (C3) which electrically couples the first interconnection point (P1) and the second interconnection point (P2),
• wherein the DC-DC converter system further includes a third diode (D3), the anode of which is electrically connected to the input of the DC-DC converter system, to the end of the first inductor (L1) or both the input of the DC-DC converter system and the end of the first inductor, and the cathode of which is electrically connected to the end of the second diode (D2), to the second supply output, or both the end of the second diode and the second supply output.