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AL3050 Datasheet

SMALL PANEL BACKLIGHT LED DRIVER

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AL3050 pdf
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



Diodes Semiconductor Electronic Components Datasheet

AL3050 Datasheet

SMALL PANEL BACKLIGHT LED DRIVER

No Preview Available !

AL3050 pdf
Typical Applications Circuit
2.7V to 5.5V
VBAT
CIN
2.2µF
PWM or single wire
Dimming Control
L
22µH
VIN SW
CTRL VOUT
GND
FB
Up to 8 LEDs
COUT
1µF
RFB
10W
AL3050
Pin Descriptions
Pin Number
1
2
3
4
5
6
-
Pin Name
CTRL
VIN
VOUT
FB
GND
SW
Thermal Pad
Function
Control pin of the boost converter. It is a multi-functional pin which can be used for enable control, PWM and
digital dimming.
Supply input pin. A capacitor should be connected between the VIN pin and GND pin to keep the DC input
voltage constant.
Output of the boost converter.
Feedback pin for current. Connect a resistor between this pin and GND to set the current.
Ground.
This is the switching node of the IC. Connect the inductor between the VIN and SW pin.
The thermal pad should be soldered to the analog ground plane. If possible, use thermal via to connect to
ground plane for ideal power dissipation.
Functional Block Diagram
VIN
SW
UVLO
CTRL
OSC
Soft
Start-up
Gate Driver
Control
Ramp
Generator
+
Comp
-
-+
Curren+t
Sensor
-
Error
Amp
+
VREF
PWM & EasyScale
Reference Control
OVP
Detection
VOUT
FB
GND
AL3050
Document number: DS38578 Rev. 2 - 2
2 of 16
www.diodes.com
July 2016
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AL3050 Datasheet

SMALL PANEL BACKLIGHT LED DRIVER

No Preview Available !

AL3050 pdf
AL3050
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) (Note 4)
Symbol
VIN
VVOUT, VSW
VFB, VCTRL
θJA
TJ
TSTG
ESD
Parameter
Input Pin Voltage
VOUT and SW Pin Voltage
FB and CTRL Pin Voltage
Thermal Resistance (Junction to Ambient)
Operating Junction Temperature
Storage Temperature
ESD (Human Body Model)
ESD (Machine Model)
Rating
-0.3 to 6
-0.3 to 32
-0.3 to 6
U-DFN2020-6
(Type S)
+150
-65 to +150
2000
200
70.4
Unit
V
V
V
oC/W
oC
oC
V
V
Note:
4. Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol
VIN
VO
IO
fPWM
TA
TJ
Parameter
Input Voltage
Output Voltage
Output Current
PWM Dimming Frequency
Operating Ambient Temperature
Operating Junction Temperature
Min
2.7
VIN
-
20
-40
-40
Max
5.5
30
40
100
+85
+125
Unit
V
V
mA
kHz
ºC
ºC
AL3050
Document number: DS38578 Rev. 2 - 2
3 of 16
www.diodes.com
July 2016
© Diodes Incorporated




Part Number AL3050
Description SMALL PANEL BACKLIGHT LED DRIVER
Maker Diodes
Total Page 16 Pages
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