A high efficiency and high brightness white LED driver with adaptive current control strategy in 0.5um CMOS process is
presented in this paper. The current control mode is determined by output current level and input voltage value, switching
between normal low drop-out (LDO) regulator and 2×charge-pump mode. The presented whiter LED driver is able to
drive load current as large as 1.1A. The peak efficiency as high as 95% occurs at 220mA load current, with an output
voltage ripple lower than 95mV at 1.1A output current can be achieved.