AL5802LPL (Diodes)
LED DRIVER

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AL5802LPL
LED DRIVER, 30V, LINEAR, ADJUSTABLE, CURRENT SINK
Description
The AL5802LPL combines a high-gain NPN transistor with a pre-
biased NPN transistor to make a simple, small footprint LED driver.
Pin Assignments
The LED current is set by an external resistor connected from the
REXT Pin (4) to the GND Pin (6), and the internal high gain transistor
develops approximately 0.6V across the external resistor.
The AL5802LPL’s open-collector output can operate from 0.8V to 30V
making it suitable for industry standard 5V to 24V power supplies
without additional components.
PWM dimming of the LED current can be achieved by either driving
the BIAS Pin (1) with a low impedance voltage source, or driving the
EN Pin (5) with an external open-collector NPN transistor or
open-drain N-Channel MOSFET.
The AL5802LPL is available in a U-DFN3030-6 (Type B) package and
is ideal for driving 10mA to 120mA LED currents.
123
7
Internal Schematic
(Top View)
6 54
(Bottom View)
Package: U-DFN3030-6 (Type B)
The Collector of Q2 is Connected to Pin 2 and Pad 7 which is on
the Underside of the Package
Pin 3 is Not Connected to Anything
Features
Reference Voltage VREXT = 0.65V
-40 to +125°C Operating Temperature Range
0.8V to 30V Open-Collector Output
Negative Temperature Coefficient Automatically Reduces the
LED Current at High Temperatures
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Mechanical Data
Case: U-DFN3030-6 (Type B)
Case Material: Molded Plastic, “Green” Molding Compound.
UL Flammability Classification Rating 94-V-0.
Moisture Sensitivity: Level 1 per J-STD-020
Terminals: Finish NiPdAu over Copper Leadframe.
Solderable per MIL-STD-202, Method 208 e4
Weight: 0.0156 grams
Ordering Information (Note 4)
Device
AL5802LPL
Qualification
Commercial
Packaging
U-DFN3030-6 (Type B)
Tape and Reel
Quantity
Part Number Suffix
3,000/Tape & Reel
-7
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.
4. For packaging details, go to our website at http://www.diodes.com/products/packages.html.
AL5802LPL
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LED DRIVER

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AL5802LPL
Marking Information
5802 = Product Type Marking Code
YM = Date Code Marking
Y = Year (ex: D = 2016)
M = Month (ex: 9 = September)
Date Code Key
Year
Code
2016
D
Month
Code
Jan
1
2017
E
Feb Mar
23
2018
F
Apr
4
2019
G
May
5
2020
H
Jun Jul
67
2021
I
Aug
8
2022
J
Sep
9
2023
K
Oct Nov
ON
2024
L
Dec
D
Typical Application Circuit
Pin Descriptions
Pin Number
1
2
3
4
5
6
Name
BIAS
OUT
N/C
REXT
EN
GND
Function
Biases the Open Collector Output Transistor
Open-Collector LED Driver Output
No Connection
Current Sense Pin
LED current sensing resistor should be connected from here to GND
Enable Pin for PWM Dimming
Provides access to the base of Q2 and the collector of Q1
Ground Reference Point for Setting LED Current
AL5802LPL
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LED DRIVER

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Functional Block Diagram
AL5802LPL
Figure 1 Block Diagram
Absolute Maximum Ratings (Note 5)
Note:
Symbol
VOUT
VBIAS
VFB
VEN
VREXT
IOUT
TOP
TSTG
Characteristics
Output Voltage Relative to GND
BIAS Voltage Relative to GND
LED Voltage Relative to GND
EN Voltage Relative to GND
REXT Voltage Relative to GND
Output Current
Operating Temperature
Storage Temperature
Values
30
30
6
6
6
150
-40 to +150
-55 to +150
Unit
V
V
V
V
V
mA
°C
°C
5. These are stress ratings only. Operation outside the absolute maximum ratings may cause device failure. Operation at the absolute maximum rating for
extended periods of time may reduce device reliability.
Package Thermal Data
Characteristic
Power Dissipation (Note 6) (@TA = +25°C)
Thermal Resistance, Junction to Ambient Air (Note 6) (@TA = +25°C)
Symbol
PD
RθJA
Value
0.88
145
Unit
W
°C/W
Recommended Operating Conditions
Symbol
VBIAS
VOUT
ILED
TA
Parameter
Supply Voltage Range
OUT Voltage Range
LED Pin Current (Note 7)
Operating Ambient Temperature Range
Min
4.5
0.8
10
-40
Notes:
6. Device mounted on FR-4 PCB, single-sided, 2oz copper trace weight with minimum recommended pad layout.
7. Subject to ambient temperature, power dissipation and PCB substrate material selection.
Max
30
30
120
+125
AL5802LPL
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Unit
V
mA
°C
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LED DRIVER

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AL5802LPL
Electrical Characteristics NPN Transistor Q1 (@TA = +25°C, unless otherwise specified.)
Symbol
V(BR)CEO
V(BR)EBO
ICEX
IBL
hFE
VCE(SAT)
VBE(SAT)
VBE(ON)
Characteristic
Collector-Emitter Breakdown Voltage (Notes 8 & 9)
Emitter-Base Breakdown Voltage
Collector Cutoff Current (Note 9)
Base Cutoff Current (Note 9)
DC Current Gain
Collector-Emitter Saturation Voltage (Note 8)
Base-Emitter Saturation Voltage
Base-Emitter Turn-On Voltage
Test Condition
IC = 1.0mA, IB = 0
IE = 10µA, IC = 0
VCE = 30V, VEB(OFF) = 3.0V
VCE = 30V, VEB(OFF) = 3.0V
IC = 1.0mA, VCE = 1.0V
IC = 10mA, VCE = 1.0V
IC = 10mA, IB = 1.0mA
IC = 10mA, IB = 1.0mA
VCE = 1.50V, IC = 2.0mA
Min
40
6.0
70
100
0.65
0.30
Typ
Max
50
50
300
0.20
0.85
1.10
Unit
V
V
nA
nA
V
V
V
Electrical Characteristics NPN Pre-Biased Transistor Q2 (@TA = +25°C, unless otherwise specified.)
Symbol
V(BR)CBO
V(BR)CEO
V(BR)EBO
ICBO
IEBO
VCE(SAT)
VBE(ON)
hFE
R1
Characteristic
Collector-Base Breakdown Voltage
Collector-Emitter Breakdown Voltage (Note 8)
Emitter-Base Breakdown Voltage (Note 9)
Collector Cutoff Current
Emitter Cutoff Current (Note 9)
Collector-Emitter Saturation Voltage (Note 8)
Base-Emitter Turn-On Voltage
DC Current Gain (Note 8)
Input Resistance
Test Condition
IC = 50μA, IE = 0
IC = 1mA, IB = 0
IE = 50μA, IC = 0
VCB = 30V, IE = 0
VEB = 4V, IC = 0
IC = 10mA, IB = 1mA
VCE = 5.0V, IC = 2.0mA
VCE = 5V, IC = 150mA
Min Typ Max
30 — —
30 — —
5.0 — —
— — 0.5
— — 0.5
— — 0.3
0.30 1.10
100
7 10 13
Notes:
8. Short duration pulse test used to minimize self-heating effect.
9. Guaranteed by design and tested only at the wafer level for single die. These parameters cannot be tested at the finished goods level due to
the testability of the device changed after packaging multiple dies to form an application circuit.
Unit
V
V
V
µA
µA
V
V
kΩ
AL5802LPL
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LED DRIVER

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Thermal Characteristics
AL5802LPL
VOUT (V)
Figure 3 Output Current vs. VOUT
100
50
Vbias = 24V
Vout = 1.4V
Vout = 5.4V
0
1 10 100
Figure 4 Output Current vs. Rext
Rext ( Ω)
VOUT (V)
Figure 5 Output Current vs. VOUT
VOUT (V)
Figure 6 Output Current vs. VOUT
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Typical Performance Characteristics
AL5802LPL
VOUT (V)
Figure 7 Output Current vs. VOUT
VBIAS (V)
Figure 8 Output Current vs. VBIAS
VBIAS (V)
Figure 9 Output Current vs. VBIAS
VBIAS (V)
Figure 10 Output Current vs. VBIAS
VBIAS (V)
Figure 11 Output Current vs. VBIAS
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AL5802LPL
Application Information
The AL5802LPL is designed for driving low current LEDs with a typical LED current of 10mA to 100mA. It provides a cost-effective means for
driving low current LEDs compared with more complex switching regulator solutions. Furthermore, it reduces the PCB board area of the solution as
there is no need for external components like inductors, capacitors and switching diodes.
Figure 12 shows a typical application circuit diagram for driving an LED or string of LEDs. The NPN transistor Q1 measures the LED current by
sensing the voltage across an external resistor REXT. Q1 uses its VBE as a reference to set the voltage across REXT and controls the base current
into Q2. Q2 operates in linear mode to regulate the LED current. The LED current is expressed as follows:
ILED = VBE(Q1) / REXT
From this, for any required LED current, the necessary external resistor REXT can be calculated as follows:
REXT = VBE(Q1) / ILED
Two or more AL5802LPL devices can be connected in parallel to construct higher current LED strings as shown in Figure 13.
Consideration of the expected linear mode power dissipation must be factored into the design, with respect to the AL5802LPL's thermal resistance.
The maximum voltage across the device can be calculated by taking the maximum supply voltage minus the voltage across the LED string.
VCE(Q2) = VCC VLED VBE(Q1)
PD = VCE(Q2) * ILED + ( VCC VBE(Q2) VBE(Q1))2 / R1
As the output current of AL5802LPL increases, it is necessary to provide appropriate thermal relief to the device. The power dissipation supported
by the device is dependent upon the properties of the PCB board material, the copper pad areas and the ambient temperature. The maximum
dissipation the device can handle is given as follows:
PD = ( TJ(MAX) - TA) /RθJA
Figure 12 Typical Application Circuit for
Linear Mode Current Sink LED Driver
Figure 13 Application Circuit for Increasing LED Current
AL5802LPL
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LED DRIVER

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AL5802LPL
Application Information (Continued)
PWM dimming can be achieved by driving the EN Pin. An external open-collector NPN transistor or open-drain N-Channel MOSFET can be used
to drive the EN Pin as shown in Figure 14. Dimming is achieved by turning the LEDs ON and OFF for a portion of a single cycle. The PWM signal
can be provided by a micro-controller or analog circuitry. Figure 15 is a typical response of LED current vs. PWM duty cycle on the EN Pin.
-or-
Figure 14 Application Circuits for LED Driver with PWM Dimming Functionality
60
50
40
30
20
10
0
0 20 40 60 80 100
PWM DUTY CYCLE (%)
Figure 15 Typical LED Current Response vs. PWM Duty Cycle for
REXT = 13Ω at 400Hz PWM Frequency
To remove the potential of incorrect connection of the power supply damaging the lamp’s LEDs, many systems use some form of reverse polarity
protection.
One solution for reverse input polarity protection is to simply use a diode with a low VF in-line with the driver/LED combination. The low VF of the
series-connected diode increases the available voltage to the LED stack and dissipates less power. A circuit example is presented in Figure 16
using Diodes Inc. SBR® (Super Barrier Rectifier) technology. An SDM10U45LP (0.1A/45V) is shown, providing exceptionally low VF for its package
size of 1mm x 0.6mm, equivalent to an 0402 chip style package. Other reverse voltage ratings are also available on Diodes’ website such as the
SBR02U100LP (0.2A/100V) or SBR0220LP (0.2A/20V).
Automotive applications commonly use this method for reverse battery protection.
SBR is a registered trademark of Diodes Incorporated
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LED DRIVER

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AL5802LPL
Application Information (Cont.)
A second approach, shown in Figure 17, improves upon the method shown in Figure 16. Whereas the method in Figure 16 protects the light
engine, it will not function until the problem is diagnosed and corrected.
The method shown in Figure 17 not only provides reverse polarity protection, it also corrects the reversed polarity, allowing the light engine to
function.
The BAS40BRW incorporates four low VF, Schottky diodes into a single package and allows more voltage available for the LED stack and
dissipates less power than standard rectifier bridges.
BAS40BRW
VS
Figure 16 Application Circuit for LED Driver
with Reverse Polarity Protection
AL5802LPL
RS
Figure 17 Application Circuit for LED Driver with
Assured Operation Regardless of Polarity
AL5802LPL
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AL5802LPL
Package Outline Dimensions
Please see http://www.diodes.com/package-outlines.html for the latest version.
U-DFN3030-6 (Type B)
A
C0.35
PIN1#ID
E E2
z1
A1
Seating Plane
D
D2
k
L
z
eb
U-DFN3030-6 (Type B)
Dim Min Max Typ
A 0.57 0.63 0.60
A1 0.00 0.05 0.02
b 0.45 0.55 0.50
D 2.95 3.05 3.00
D2 2.30 2.50 2.40
e – – 0.95
E 2.95 3.05 3.00
E2 0.90 1.10 1.00
L 0.55 0.65
k––
z ––
z1
0.60
0.35
0.30
0.05
All Dimensions in mm
Suggested Pad Layout
Please see http://www.diodes.com/package-outlines.html for the latest version.
U-DFN3030-6 (Type B)
X2
X1
Y2 Y1
C
G
Y
X
Dimensions
C
G
X
X1
X2
Y
Y1
Y2
Value
(in mm)
0.950
0.200
0.600
2.500
2.600
0.800
1.200
3.200
AL5802LPL
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AL5802LPL
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales
channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and
hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or
indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.
This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or
systems.
Copyright © 2016, Diodes Incorporated
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