Datasheet                                                                                                           
400KHz 60V 2A Switching Current Boost LED Constant Current Driver            XL6003
Rev 1.6                                                                                                        

1
Features
n Wide 3.6V to 24V Input Voltage Range
n 0.22V FB adjustable LED drive current
n Directly drive 6 Series 1W LED at
VIN>=12V
n Fixed 400KHz Switching Frequency
n Max. 2A Switching Current Capability
n Up to 92% efficiency
n Excellent line and load regulation
n EN PIN TTL shutdown capability &
With PWM Dimming Function  
n Internal Optimize Power MOSFET
n Built in Soft-Start Function
n Built in Frequency Compensation
n Built in Thermal Shutdown Function
n Built in Current Limit Function
n Available in SOP8 package
Applications
n LED Lighting
n Boost constant current driver
n Monitor LED Backlighting
n 7’ to 15’ LCD Panels  
General Description
The XL6003 regulator is fixed frequency PWM
Boost (step-up) LED constant current driver,
capable of driving Series 1W LED units with
excellent line and load regulation. The regulator is
simple to use because it includes internal frequency
compensation and a fixed-frequency oscillator so
that it requires a minimum number of external
components to work.
The XL6003 could directly drive 6 Series 1W LED
units at VIN>12V .
The PWM control circuit is able to adjust the
duty ratio linearly from 0 to 95%. An enable
function, an over current protection function  
is built inside. An internal compensation
block is built in to minimize external
component count.
Figure1. Package Type of XL6003           Datasheet                                                                                                           
400KHz 60V 2A Switching Current Boost LED Constant Current Driver            XL6003
Rev 1.6                                                                                                          

2
Pin Configurations
XL6003
1
3
5
2
4 SW
EN
FB
VIN
NC
6
7
8
SW
GND
GND
Figure2. Pin Configuration of XL6003 (Top View)
Table 1 Pin Description
Pin Number Pin Name Description
1  EN
Enable Pin. Drive EN pin low to turn off the device, drive it
high to turn it on. Floating is default high.
2  VIN
Supply Voltage Input Pin. XL6003 operates from a 3.6V to 24V
DC voltage. Bypass Vin to GND with a suitably large capacitor
to eliminate noise on the input.
3  FB  Feedback Pin (FB). The feedback threshold voltage is 0.22V.
4  NC  No Connected.
5,6  SW
Power Switch Output Pin (SW). Output is the switch node that
supplies power to the output.
7,8  GND  Ground Pin.             Datasheet                                                                                                           
400KHz 60V 2A Switching Current Boost LED Constant Current Driver            XL6003
Rev 1.6                                                                                                          

3
Function Block
Figure3. Function Block Diagram of XL6003
Typical Application Circuit
Figure4. XL6003 Typical Application Circuit             Datasheet                                                                                                           
400KHz 60V 2A Switching Current Boost LED Constant Current Driver            XL6003
Rev 1.6                                                                                                         

4
Ordering Information  
Part Number  Marking ID
Lead Free  Lead Free
Packing Type
XL6003E1  XL6003E1  Tube
Package
Temperature
Range
XL6003TRE1  XL6003E1  Tape & Reel
XLSEMI Pb-free products, as designated with “E1” suffix in the par number, are RoHS compliant.
Absolute Maximum Ratings（Note1）
Parameter  Symbol  Value  Unit
Input Voltage  Vin  -0.3 to 26  V
Feedback Pin Voltage  VFB
-0.3 to Vin  V
EN Pin Voltage  VEN
-0.3 to Vin  V
Output Switch Pin Voltage  VOutput
-0.3 to 60  V
Power Dissipation  PD
Internally limited  mW
Thermal Resistance (SOP8)
(Junction to Ambient, No Heatsink, Free Air)
RJA 100  ºC/W
Operating Junction Temperature  TJ
-40 to 125  ºC
Storage Temperature  TSTG
-65 to 150  ºC
Lead Temperature (Soldering, 10 sec)  TLEAD 260  ºC
ESD (HBM)  >2000  V
Note1: Stresses greater than those listed under Maximum Ratings may cause permanent damage
to the device. This is a stress rating only and functional operation of the device at these or any
other conditions above those indicated in the operation is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect reliability.           Datasheet                                                                                                           
400KHz 60V 2A Switching Current Boost LED Constant Current Driver            XL6003
Rev 1.6                                                                                                          

5
XL6003 Electrical Characteristics
Ta = 25℃;unless otherwise specified.
Symbol  Parameter Test Condition  Min. Typ. Max. Unit
System parameters test circuit figure4
VFB
Feedback
Voltage
Vin = 5V to 12V, Vout=24V
Iload=100mA
209  220  231  mV
Efficiency  ?
Vin=12V ,Vout=24V
Iout=0.3A
-  92  -  %
Electrical Characteristics (DC Parameters)
Vin = 12V, GND=0V, Vin & GND parallel connect a 100uf/50V capacitor; Iout=100mA, Ta =
25℃; the others floating unless otherwise specified.
Parameters  Symbol Test Condition  Min. Typ. Max. Unit
Input operation voltage  Vin  3.6  24  V
Shutdown Supply Current ISTBY VEN=0V  70  100  uA
Quiescent Supply Current Iq
VEN =2V,  
VFB =Vin
2.5  5  mA
Oscillator Frequency  Fosc  320  400  480  Khz
Switch Current Limit  IL VFB =0  2  A
Output Power NMOS  Rdson
Vin=12V,
ISW=2A
110  120  mohm
EN Pin Threshold  VEN
High (Regulator ON)
Low (Regulator OFF)
1.4
0.8
V
EN P IH VEN =2V (ON)  3  10  uA
in Input Leakage
Current
IL VEN =0V (OFF)  3  10  uA
Max. Duty Cycle    DMAX VFB=0V  90  %           Datasheet                                                                                                           
400KHz 60V 2A Switching Current Boost LED Constant Current Driver            XL6003
Rev 1.6                                                                                                         

6
Schottky Diode Selection Table
Current Surface
Mount
Through
Hole
VR (The same as system maximum input voltage)
20V  30V  40V  50V  60V
1A  √ 1N5817  1N5818  1N5819
√ 1N5820  1N5821  1N5822
√ MBR320  MBR330  MBR340 MBR350  MBR360
√ SK32  SK33  SK34  SK35  SK36
√ 30WQ03  30WQ04 30WQ05
√ 31DQ03  31DQ04 31DQ05
3A
√ SR302  SR303  SR304  SR305  SR306
Typical System Application for VIN=5V to driver 3 x 1W series LED units
XL6003
 CIN
47uf /16V
D1 SK34
L 22uh/2A
+5V
2
7,8 1
3
5,6
GND
VIN
SW
FB
EN
ON
OFF
350mA
ILED=0.22/RS
Series 3 1W LED
RS
COUT
47uf/35V
Figure5. XL6003 System Parameters Test Circuit (5V ~ 3 x 1W LED)           Datasheet                                                                                                           
400KHz 60V 2A Switching Current Boost LED Constant Current Driver            XL6003
Rev 1.6                                                                                                         

7
Typical System Application for VIN>=12V to driver 6 x 1W series LED units
Figure6. XL6003 System Parameters Test Circuit (12V ~ 6 x 1W LED)
Typical System Application for VIN>=12V to driver 6 series x 28 parallel
White LED Array  
Figure7. XL6003 System Parameters Test Circuit (12V ~ 6 x 28 White LED)           Datasheet                                                                                                           
400KHz 60V 2A Switching Current Boost LED Constant Current Driver            XL6003
Rev 1.6                                                                                                          

Typical System Application for SEPIC Buck-Boost LED Driver  
Figure8. XL6003 System Parameters Test Circuit (Buck-Boost LED Driver)
Typical System Application for VIN>=12V to driver 6 x 1W series LED units
With Dimming Function
Figure9. XL6003 System Parameters Test Circuit (12V ~ 6 x 1W LED with Dimming Function)           Datasheet                                                                                                           
400KHz 60V 2A Switching Current Boost LED Constant Current Driver            XL6003
Rev 1.6                                                                                                         

9
Package Information
SOP8 Package Mechanical Dimensions