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1、 3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop XL2009 Rev 1.1 1 Features?Wide 8V to 36V Input Voltage Range?Output Adjustable from 1.25V to 32V?Maximum Duty Cycle 100%?Minimum Drop Out 0.3V?Fixed 180KHz Switching Frequency?Maximum 3A Switching Current?Internal Optimize Power MOSFET?High effi
2、ciency?Excellent line and load regulation?With output constant current loop?Built in thermal shutdown function?Built in current limit function?Built in output short protection function?Available in SOP8L package Applications?Car Charger?Battery Charger?LCD Monitor and LCD TV?Portable instrument powe
3、r supply?Telecom/Networking Equipment General Description The XL2009 is a 180 KHz fixed frequency PWM buck(step-down)DC/DC converter,capable of driving a 2.5A load with high efficiency,low ripple and excellent line and load regulation.Requiring a minimum number of external components,the regulator i
4、s simple to use and include internal frequency compensation and a fixed-frequency oscillator.The PWM control circuit is able to adjust the duty ratio linearly from 0 to 100%.An over current protection function is built inside.When short protection function happens,the operation frequency will be red
5、uced from 180KHz to 48KHz.An internal compensation block is built in to minimize external component count.Figure1.Package Type of XL2009 3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop XL2009 Rev 1.1 2 Pin Configurations Figure2.Pin Configuration of XL2009(Top View)Table 1 Pin Description Pin
6、Number Pin Name Description 1 FB Feedback Pin(FB).Through an external resistor divider network,FB senses the output voltage and regulates it.The feedback threshold voltage is 1.25V.2 OCSET Output Constant Current Set Pin;3 VC Internal Voltage Regulator Bypass Capacity.In typical system application,T
7、he VC pin connect a 1uf capacity to VIN.4 VIN Supply Voltage Input Pin.XL2009 operates from a 8V to 36V DC voltage.Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input.5,6 SW Power Switch Output Pin(SW).SW is the switch node that supplies power to the output.7,8 GND Grou
8、nd Pin.Care must be taken in layout.This pin should be placed outside of the Schottky Diode to output capacitor ground path to prevent switching current spikes from inducing voltage noise into XL2009.3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop XL2009 Rev 1.1 3 Function Block Figure3.Functi
9、on Block Diagram of XL2009 Typical Application Circuit Figure4.XL2009 Typical Application Circuit(VIN=8V36V,VOUT=5V/2.1A)3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop XL2009 Rev 1.1 4 Ordering Information Part Number Marking ID Lead Free Lead Free Packing Type Package Temperature Range XL200
10、9E1 XL2009E1 2500 Units on 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 40 V Feedback Pin Voltage VFB-0.3 to Vin V Output Switch Pin Voltage VOutput-0.3 to Vin V
11、 Power Dissipation PD Internally limited mW Thermal Resistance(SOP8L)(Junction to Ambient,No Heatsink,Free Air)RJA 100 C/W Operating Junction Temperature TJ-40 to 125 C Storage Temperature TSTG-65 to 150 C Lead Temperature(Soldering,10 sec)TLEAD 260 C ESD(HBM)2000 V Note1:Stresses greater than those
12、 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 af
13、fect reliability.3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop XL2009 Rev 1.1 5 XL2009 Electrical Characteristics Ta=25;unless otherwise specified.Symbol Parameter Test Condition Min.Typ.Max.Unit System parameters test circuit figure4 VFB Feedback Voltage Vin=8V to 36V,Vout=5V Iload=0.5A to
14、2.5A 1.225 1.25 1.275 V Efficiency Vin=12V,Vout=5V Iout=2.1A-89-%Electrical Characteristics(DC Parameters)Vin=12V,GND=0V,Vin&GND parallel connect a 100uf/50V capacitor;Iout=500mA,Ta=25;the others floating unless otherwise specified.Parameters Symbol Test Condition Min.Typ.Max.Unit Input operation vo
15、ltage Vin 8 36 V Quiescent Supply Current Iq VFB=Vin 2.1 5 mA Oscillator Frequency Fosc 144 180 216 KHz Output Short Frequency Fosp 48 KHz Switch Current Limit IL VFB=0 4 A Max.Duty Cycle DMAX VFB=0V 100%Output Power PMOS Rdson VFB=0V,Vin=12V,ISW=3A 60 80 mohm 3A 180KHz 36V Buck DC to DC Converter W
16、ith CV/CC Loop Rev 1.1 6 Typical System Application(VOUT=5V/2.1A)Figure5.XL2009 System Parameters Test Circuit(VIN=8V36V,VOUT=5V/2.1A)0.00.51.01.52.02.53.00.00.51.01.52.02.53.03.54.04.55.05.5 Output voltage VS Output currentOutput voltage(V)Output current(A)VIN=12V,VOUT=5V,RCS=14K VIN=24V,VOUT=5V,RC
17、S=14K Figure6.XL2009 System Output Constant Current Curve 3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop XL2009 Rev 1.1 7 0.00.20.40.60.81.01.21.41.61.82.02.22.4404550556065707580859095100 Efficiency VS Load currentEfficiency(%)Load current(A)Vin=8V,Vout=5V Vin=12V,Vout=5V Vin=24V,Vout=5V Vin
18、=36V,Vout=5V Figure7.XL2009 System Efficiency Curve 02468101214160.00.20.40.60.81.01.21.41.61.82.02.22.42.62.83.0 Output current VS RCSOutput current(A)RCS(Kohm)VIN=12V,VOUT=5V VIN=24V,VOUT=5VIOUT=1.0A,RCS=5KIOUT=1.5A,RCS=8KIOUT=1.8A,RCS=11KIOUT=2.1A,RCS=14KIOUT=2.5A,RCS=16K Figure8.RCS VS Output Cu
19、rrent Select Curve 3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop XL2009 Rev 1.1 8 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
20、SK32 SK33 SK34 SK35 SK36 30WQ03 30WQ04 30WQ05 31DQ03 31DQ04 31DQ05 3A SR302 SR303 SR304 SR305 SR306 3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop XL2009 Rev 1.1 9 Package Information SOP8 Package Mechanical Dimensions 3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop XL2009 Features?Wide
21、 8V to 36V Input Voltage Range?Output Adjustable from 1.25V to 32V?Maximum Duty Cycle 100%?Minimum Drop Out 0.3V?Fixed 180KHz Switching Frequency?Maximum 3A Switching Current?Internal Optimize Power MOSFET?High efficiency?Excellent line and load regulation?With output constant current loop?Built in
22、thermal shutdown function?Built in current limit function?Built in output short protection function?Available in SOP8L package Applications?Car Charger?Battery Charger?LCD Monitor and LCD TV?Portable instrument power supply?Telecom/Networking Equipment General Description The XL2009 is a 180 KHz fix
23、ed frequency PWM buck(step-down)DC/DC converter,capable of driving a 2.5A load with high efficiency,low ripple and excellent line and load regulation.Requiring a minimum number of external components,the regulator is simple to use and include internal frequency compensation and a fixed-frequency osc
24、illator.The PWM control circuit is able to adjust the duty ratio linearly from 0 to 100%.An over current protection function is built inside.When short protection function happens,the operation frequency will be reduced from 180KHz to 48KHz.An internal compensation block is built in to minimize external component count.