An LED current control device (100) includes an array of one or more LEDs (10) electrically connected to a current-sensing element (20). A sense signal produced by the current-sensing element may be amplified by a single-ended amplifier (30) and sent to a switching controller (40 and 50). The switching controller may perform hysteretic control on the amplified sense signal by controlling a switching element (60) to turn on and off. The on and off states of the switching element respectively enables and disables an external power supply (VEXT) for the LED array. As such, hysteretic control may be performed on the current flowing through the LEDs.