Design of a low power LED driver with adjustable LDO

The issue of high power consumption in the standby state of the driver chip for conventional LED is addressed by proposing an adjustable LDO. This LDO optimizes the static power consumption current of the LED driver chip through a power management circuit. In standby mode, a portion of the LDO circuit and the driver chip display circuit are deactivated, effectively reducing the static power consumption current of the driver chip. The standby mode static power consumption current of the LED driver chip equipped with adjustable LDO is measured to be 46.82 mu A, while the static power consumption current of the LED driver chip without adjustable LDO amounts to 151.83 mu A. In standby mode, compared to the non-adjustable option, there is a reduction of 105 mu A in adjustable power consumption current, with a corresponding static power consumption of only 0.23 mW for the LED driver chip. The LED driver chip designed in this paper is realized using a 180 nm BCD process.