Advanced Analogic Technologies has released the AAT2868 and AAT2869 LED backlight drivers. They are 1x/1,5x dual-mode, high-efficiency charge pump-based white LED backlight drivers that drive four constant current LED channels and offer content adaptive brightness control (CABC) or dynamic backlight control (DBC) to reduce power consumption by up to 50%. To form a complete lighting solution, both devices include two linear low drop-out (LDO) voltage regulators.
For CABC and dimming functions, the AAT2868 provides the user with a pulse-width modulation (PWM) dimming input for external brightness and fading control that functions in parallel to the fully scaled 32-step LED current that is programmed though the AS2C wire interface. The AAT2869 replaces the manual PWM input with an AS2C based auto-dimming and fade capability that reduces requirements on system resources. The AAT2869 automated fade-in and fade-out feature makes backlight turn-on and turn-off more visually pleasing. Both backlight drivers deliver improved power savings by allowing the system to continuously adjust the backlight current level in relation to the displayed image.
The devices are capable of driving four white LEDs at a total 124 mA from a 2,7 V to 5,5 V input. The integrated dual linear LDO regulators are independently programmable from 1,2 V to 3,0 V at a total load of 150 mA each. These LDO voltage regulators can be used to power an additional display controller, CMOS image sensor, vibration motor or other accessories.
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