A driver circuit for driving an electrical motor coil (40, 60) comprising: switched inductance boost voltage converter circuitry comprising a storage capacitor (38, 52), an input node, a boost diode (30, 54) and a boost switch (32, 50) connected in series between the terminals of the storage capacitor, wherein the boost diode is arranged to connect in a forward direction the boost switch and a first electrode of the storage capacitor, and the boost switch is arranged to connect a connection node between the boost diode and the boost switch to a second electrode of the storage capacitor in dependence on a boost signal (BOOST); and switched inductance buck voltage converter circuitry comprising the input node, the storage capacitor (38, 52), a buck diode (34, 66) connecting in a forward direction the second electrode of the storage capacitor to the input node, and a buck switch (36, 64) that is arranged to connect the input node to the first electrode of the storage capacitor in dependence on a buck signal (BUCK), wherein inductance of the switched inductance boost voltage converter circuitry and of the switched inductance buck voltage converter circuitry is provided by the electrical motor coil when the input node is coupled to the electrical motor coil, and an output of the switched inductance boost voltage converter circuitry is a voltage developed across the storage capacitor and an input of the switched inductance buck voltage converter circuitry is the voltage developed across the storage capacitor, and wherein the switched inductance boost voltage converter circuitry further comprises a first boost circuit diode arranged to connect in a forward direction the input node to the connection node between the boost switch and the boost diode. switched inductance boost voltage converter circuitry comprising a storage capacitor (38, 52), an input node, a boost diode (30, 54) and a boost switch (32, 50) connected in series between the terminals of the storage capacitor, wherein the boost diode is arranged to connect in a forward direction the boost switch and a first electrode of the storage capacitor, and the boost switch is arranged to connect a connection node between the boost diode and the boost switch to a second electrode of the storage capacitor in dependence on a boost signal (BOOST); and switched inductance buck voltage converter circuitry comprising the input node, the storage capacitor (38, 52), a buck diode (34, 66) connecting in a forward direction the second electrode of the storage capacitor to the input node, and a buck switch (36, 64) that is arranged to connect the input node to the first electrode of the storage capacitor in dependence on a buck signal (BUCK), wherein inductance of the switched inductance boost voltage converter circuitry and of the switched inductance buck voltage converter circuitry is provided by the electrical motor coil when the input node is coupled to the electrical motor coil, and an output of the switched inductance boost voltage converter circuitry is a voltage developed across the storage capacitor and an input of the switched inductance buck voltage converter circuitry is the voltage developed across the storage capacitor, and wherein the switched inductance boost voltage converter circuitry further comprises a first boost circuit diode arranged to connect in a forward direction the input node to the connection node between the boost switch and the boost diode.