9-channel LED drivers
27 October 2010
Opto-Electronics
Diodes Incorporated has announced two new 9-channel LED drivers with internal charge pumps for backlighting of small LCD screens, keypads and LED lights.
Working from 2,7 V to 5,5 V and driving 20 mA, the applications include mobile phones and other portable consumer devices. Driving three groups of three LED channels and its three independent PWM dimmable control inputs, the AL3158 provides a simple drive for RGB LEDs. The AL3159 with its versatile 3-wire logic decoding of LED current control simplifies the driving of nine LEDs for illuminating LCD screens and LED indicator control.
The inductorless solution requires only three external capacitors to complete the driver circuit. High levels of functional integration coupled with thin QFN packages mean that these devices save board space and reduce manufacturing costs. The devices offer up to 93% power efficiency and feature 1% current matching accuracy between channels to deliver an even, consistent screen image. LED open- and short-circuit protection, thermal and under-voltage lockout and over-voltage protection are provided on all channel outputs to maximise reliability. A soft start function reduces power supply inrush current to extend battery operating life.
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