DC-DC converter device comprising: - a resonant circuit comprising DC input terminals (Tin1, Tin2) and first and second resonant circuit switches (Sdcl, Sdc2) each having a gate (Gsdc1, Gsdc2); - a synchronous rectifier connected to the resonant circuit, where the synchronous rectifier comprises DC output terminals (Tout1, Tout2) and first and second rectifier switches (Sr1, Sr2) each having a gate (Gsr1, Gsr2); - a digital signal processor comprising rectifier switch gate control terminals (GCsr1, GCsr2) for controlling the first and second rectifier switches (Sr1, Sr2) respectively, and resonant circuit switch gate control terminals (GCsdc1, GCsdc2) for controlling the first and second resonant circuit switches (Sdcl, Sdc2) respectively; - a gate driver connected between each rectifier switch gate control terminal (GCsr1, GCsr2) and the respective gate (Gsr1, Gsr2) of the first and second rectifier switches (Sr1, Sr2); where the DC-DC converter device further comprises: - a shutdown device connected between each rectifier switch gate control terminal (GCsr1, GCsr2) and either an enable terminal of the corresponding gate driver or the gate (Gsr1, Gsr2) of the corresponding rectifier switch (Sr1, Sr2); - a shutdown signal conductor connected between the digital signal processor and the shutdown device for transferring a shutdown signal from the digital signal processor to the shutdown device; where the shutdown device is configured to: - control the gates (Gsr1, Gsr2) of the first and second rectifier switches (Sr1, Sr2) to stay low if the corresponding rectifier switch gate control terminal (GCsr1, GCsr2) was turned low when receiving the shutdown signal; characterized in that the shutdown device is configured to: - control the gates (Gsr1, Gsr2) of the first and second rectifier switches (Sr1, Sr2) to stay high if the corresponding rectifier switch gate control terminal (GCsr1, GCsr2) was turned high when receiving the shutdown signal, and, when the first and/or second rectifier switch gate control terminal (GCsr1, GCsr2) is turned low by the digital signal processor, control the gate (Gsr1, Gsr2) of the corresponding rectifier switch (Sr1, Sr2) to stay low. - a resonant circuit comprising DC input terminals (Tin1, Tin2) and first and second resonant circuit switches (Sdcl, Sdc2) each having a gate (Gsdc1, Gsdc2); - a synchronous rectifier connected to the resonant circuit, where the synchronous rectifier comprises DC output terminals (Tout1, Tout2) and first and second rectifier switches (Sr1, Sr2) each having a gate (Gsr1, Gsr2); - a digital signal processor comprising rectifier switch gate control terminals (GCsr1, GCsr2) for controlling the first and second rectifier switches (Sr1, Sr2) respectively, and resonant circuit switch gate control terminals (GCsdc1, GCsdc2) for controlling the first and second resonant circuit switches (Sdcl, Sdc2) respectively; - a gate driver connected between each rectifier switch gate control terminal (GCsr1, GCsr2) and the respective gate (Gsr1, Gsr2) of the first and second rectifier switches (Sr1, Sr2); - a shutdown device connected between each rectifier switch gate control terminal (GCsr1, GCsr2) and either an enable terminal of the corresponding gate driver or the gate (Gsr1, Gsr2) of the corresponding rectifier switch (Sr1, Sr2); - a shutdown signal conductor connected between the digital signal processor and the shutdown device for transferring a shutdown signal from the digital signal processor to the shutdown device; - control the gates (Gsr1, Gsr2) of the first and second rectifier switches (Sr1, Sr2) to stay low if the corresponding rectifier switch gate control terminal (GCsr1, GCsr2) was turned low when receiving the shutdown signal; - control the gates (Gsr1, Gsr2) of the first and second rectifier switches (Sr1, Sr2) to stay high if the corresponding rectifier switch gate control terminal (GCsr1, GCsr2) was turned high when receiving the shutdown signal, and, when the first and/or second rectifier switch gate control terminal (GCsr1, GCsr2) is turned low by the digital signal processor, control the gate (Gsr1, Gsr2) of the corresponding rectifier switch (Sr1, Sr2) to stay low.