High Efficiency, Six-Channel White LED Driver with I2C Interface
The SKY81453-13 is a highly integrated, high efficiency LED backlight solution for tablets, notebook computers, monitors, and other portable devices.
An integrated boost converter provides a high voltage output for driving up to 28 V. Six precision current sinks are programmable up to 60 mA per string. The integrated boost regulator switching frequency is adjustable from 600 kHz to 2 MHz for system integration flexibility, to optimize efficiency, and to minimize external passive component requirements.
The SKY81453-13 supports filtered Pulse Width Modulation (PWM) dimming and I2C dimming. The duty cycle of PWM input signal and the I2C brightness control program can be used to control the LED current level not to exceed the maximum LED current, which is set by an external RISET resistor. The I2C brightness control and the PWM duty input signal are multiplied to control the output current level. When the PWM pin is not used, pull this pin to high or set the “ignore PWM input” bit (IGPW). The PWM input frequency range is 100 Hz to 50 kHz with a 10-bit dimming resolution for frequencies between 100 Hz and 25 kHz, and 8-bit dimming resolution for frequencies between 25 kHz and 50 kHz.
For system protection, the SKY81453-13 senses open or shorted LED conditions and over-temperature events. High voltage current sink design prevents damage resulting from short LEDs. System faults are reported through the I2C interface.
The SKY81453-13 is available in a Pb-free, 2.44 mm × 2.44 mm 25-bump Wafer Level Chip Scale Package (WLCSP).