AL3050

Document number: DS38578 Rev. 2 - 2

1 of 16

www.diodes.com

July 2016

© Diodes Incorporated

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.

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



200mV Reference with ±3% Accuracy



750kHz Switching Frequency



Flexible Digital and PWM Brightness Control



Single Wire Control Interface



PWM Dimming Control Interface



Up to 100:1 PWM Dimming Ratio



Integrated Loop Compensation



Built-in Soft-Start



Built-in OTP



Built-in OCP



Tiny Package with U-DFN2020-6 (Type S) Package



Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)



Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

(Top View)

3

2

1

6

5

4

CTRL

VIN

VOUT

FB

GND

SW

Thermal

Pad

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

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

3. Halogen- and Antimony-

free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.