Integrated multi-channel constant current LED driver with PWM boost converter design in 0.35µm process

Realization of an integrated LED driver with boost converter with the use of standard CMOS technology is presented in this paper. By considering Lithium-Ion battery in driving LED strings, an overall maximum efficiency of 85% and current error accuracy of 0.0046% is achieved. The boost converter operates in PWM voltage mode at 600 kHz with stable output voltage as a voltage source to LED driver. Moreover, a 10MHz dimming frequency can be achieved for high-end portable device with multimedia applications. Two or three channels that act as control for a constant current source for series connection of LED strings, a current balance circuit is applied. This design is simulated with TSMC 0.35μm process with an effective layout area of 2.279967 × 2.39105mm² and a power lower than 1W.