AL3050 Datasheet | Diodes Incorporated

SMALL PANEL BACKLIGHT LED DRIVER Description The AL3050 is a current mode Boost-type LED driver with programmable brightness dimming control for portable devices. With a 30V rated integrated MOSFET and power diode, the AL3050 can support up to 8 LEDs in series. The small solution size, advanced dimming Features and high efficiency are suitable for LED backlight solutions for single cell Li-ion based equipment. The boost converter runs at 750k Hz fixed switching frequency to reduce output ripple, improve conversion efficiency, and allows for the use of small external ponents. The default LED current is adjustable by an external resister at FB pin and the feedback voltage is regulated to 200m V typically. The AL3050 provides PWM dimming mode and single wire digital dimming mode for accurate LED current control from CTRL pin. In PWM dimming mode, the feedback reference voltage is changed with the PWM duty cycle proportionally and the available PWM frequency range is from 20k Hz to 100k Hz. In single wire digital dimming mode, it provides a programmable 32-step brightness dimming function with the CTRL pin setting. The AL3050 provides protection functions including Under Voltage Lockout, Over Voltage Protection, Over Current Protection and Over Temperature Protection to protect the circuit. Pin Assignments (Top View) CTRL 1 VIN 2 VOUT 3 Thermal Pad 6 SW 5 GND 4 FB U-DFN2020-6 (Type S) Applications - Feature Phones - Smart Phones - Portable Media Players - Ultra Mobile Devices - GPS Receivers - Backlight for Small and Media Form Factor LCD Display The AL3050 is available in U-DFN2020-6 (Type S) packages. Features - 2.7V to 5.5V Input Voltage Range - 28V Open LED Protection (Up to 8 LEDs) - Integrated 0.7A/30V Internal MOSFET and Power Diode - 200m V Reference with ±3% Accuracy - 750k Hz Switching Frequency - Flexible Digital and PWM Brightness Control - Single Wire Control Interface - PWM Dimming Control Interface - Up to 100:1 PWM Dimming...