AL3050 Datasheet, PDF (1/16 Pages) Diodes Incorporated – SMALL PANEL BACKLIGHT LED DRIVER

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 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
 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)
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.
AL3050
Document number: DS38578 Rev. 2 - 2
1 of 16
www.diodes.com
July 2016
© Diodes Incorporated