Austrian microelectronics push LED backlight driver chip for mobile phone display
Austriamicrosystems has announced the AS3674 and AS3490 LED backlight driver chips for smartphone LCD displays. The new product has the highest performance in the industry with a peak value of 90%, including DC-DC converters and current sources. The PCB package is only 11.5 mm2 and requires only 4 external components. The AS3674 and AS3490 are ideal for smartphones and other mobile devices that place space as a top priority.
The AS3674 backlight driver chip family complements the Austrian microelectronics lighting management unit portfolio, which combines application processing with backlights, smart lighting, and ambient light sensors (ALS). The AS3674 is a highly efficient 2 Mhz DC-DC switching boost converter that can control five sets of current sources, each driving two LEDs in series. The added flexibility is set by the external resistor when controlling the current of the LED, up to 25mA in a single channel. The AS3490 has the same functionality as the AS3674, but only contains three LED channels.
The soft-start feature makes the AS3674 easier to integrate into noise-sensitive wireless RF systems. The AS3674 is controlled by two input circuits and can also be controlled with a PWM circuit between 100 and 800 Hz to achieve a 1:2000 dimming ratio. The single-channel, two-LED configuration combined with a 2 MHz converter operating frequency enables the use of tiny external components such as 4.7μH inductors and achieves high efficiency up to 6% over competitors.
The AS3674 operates from 2.5V to 5.5V and includes a range of safety features such as low voltage blocking, overcurrent and overtemperature protection, and LED testing. Both the AS3674 and AS3490 are available in a space-saving 12-ball WL-CSP package (1.7 x 1.4 x 0.5 mm, 0.4 mm high).
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