A driver device and a corresponding method for driving a load, in particular an LED unit comprising one or more LEDs. The proposed driver device comprises power input terminals for receiving a rectified supply voltage from an external power supply, power output terminals for providing a drive voltage and/or current for driving a load, a half bridge unit comprising a first and second switching element coupled in series between a high voltage node and a low voltage node and having a switch node between the first and second switching elements, a buck-boost input filter unit comprising a first inductor and a series diode coupled between a power input terminal and the half bridge unit, a buck output filter unit comprising a second inductor coupled between the half bridge unit and a power output terminal, an energy storage unit, and a control unit for controlling the switching elements.