Title :
Design of a white LED backlight driver IC based on a new three-mode charge pump
Author :
Wang, Y.M. ; Deng, W.L. ; Ma, X.Y. ; Huang, W.Y. ; Huang, J.K.
Author_Institution :
Dept. of Electron. Eng., Jinan Univ., Guangzhou, China
Abstract :
Using CSMC 0.5μm process model, a white LED backlight driver ASIC with constant-current output based on charge pump was designed. A new three-mode charge pump and LED driver modules with high-precision driving current matching were used to improve performance of the chip. The samples of chip were tested in the temperature from -40°C to 85°C and the voltage from 2.5V to 5.5V. The result indicated that, the standard output current of the chip is 80mA, the maximum output current is 124mA, the shutdown current is 0.36μA, the error in output current between channels is 0.5%, the error in output current between chips is 0.8%, and the maximum conversion efficiency of the chip is 92%.
Keywords :
CMOS integrated circuits; application specific integrated circuits; charge pump circuits; constant current sources; driver circuits; light emitting diodes; optical design techniques; optical testing; CSMC process model; chip conversion efficiency; chip sample testing; constant-current output; current 0.36 muA; current 124 mA; current 80 mA; high-precision driving current matching; size 0.5 mum; temperature -40 degC to 85 degC; three-mode charge pump; voltage 2.5 V to 5.5 V; white LED backlight driver ASIC; Charge pump; IC; bandgap reference; constant-current driving; layout;
Conference_Titel :
Information Science and Control Engineering 2012 (ICISCE 2012), IET International Conference on
Conference_Location :
Shenzhen
Electronic_ISBN :
978-1-84919-641-3
DOI :
10.1049/cp.2012.2441
