An RGB-LED driver with a pulse-skipping-modulation boost converter is proposed to fix the reference voltage for lowering down the circuit complexity. A high-voltage LDO and a bandgap reference circuit are built into the chip. The proposed converter outputs a different voltage in response to a different color of LEDs. The output voltages for driving six red, six green, and six blue LEDs in series are 13.5V, 20V, and 21.5V, respectively. The proposed LDO and bandgap reference circuit work with supply voltages from 8V to 12V. The settling time for changing colors is lower than 300µs, better than the unfixed-reference-voltage methods. The proposed circuit was fabricated by using 0.25-µm BCD 60V technology, and the chip area was 1.9 × 1.7mm2.