This study proposes the LED driver circuit with the boost output voltage controlling function for the efficient power management of the LED backlight device, which has been one of the highlighted issues recently. The proposed circuit does not need any standard voltage generation circuit or comparator, and features the embodiment of the integrated circuit that requires only a relatively small area. In addition, the lineal boost output voltage control in consideration of such factors as difference in forward voltage of LED, characteristic changes at different temperatures, and power consumption during the operation enables the voltage at both sides of the constant current source to be kept minimized, through which a high reliability LED backlight device with excellent power efficiency can be embodied.