AL3050

AL3050 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 750kHz fixed switching frequency to reduce output ripple, improve conversion efficiency, and allows for the use of small external components. The default LED current is adjustable by an external resister at FB pin and the feedback voltage is regulated to 200mV 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 20kHz to 100kHz. 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 Mobi...