联系人：曹中立 电话：１３４２８７０６２２３ ＱＱ：１１５７００８１１５ 3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop Datasheet XL2009 Features General Description n n Wide 8V to 36V Input Voltage Range Output Adjustable from 1.25V to 32V n n Maximum Duty Cycle 100% Minimum Drop Out 0.3V n n n Fixed 180KHz Switching Frequency Maximum 3A Switching Current Internal Optimize Power MOSFET High efficiency 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 is simple to use and include internal frequency compensation and a fixed-frequency oscillator. n n n n n n n 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 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. Applications n n n n n Car Charger Battery Charger LCD Monitor and LCD TV Portable instrument power supply Telecom / Networking Equipment Figure1. Package Type of XL2009 Rev 1.1 www.xlsemi.com 1 Datasheet 3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop XL2009 Pin Configurations Figure2. Pin Configuration of XL2009 (Top View) Table 1 Pin Description Pin Number Pin Name 1 FB 2 OCSET 3 VC 4 VIN 5,6 SW 7,8 GND Description Feedback Pin (FB). Through an external resistor divider network, FB senses the output voltage and regulates it. The feedback threshold voltage is 1.25V. Output Constant Current Set Pin; Internal Voltage Regulator Bypass Capacity. In typical system application, The VC pin connect a 1uf capacity to 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. Power Switch Output Pin (SW). SW is the switch node that supplies power to the output. Ground 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. Rev 1.1 www.xlsemi.com 2 Datasheet 3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop XL2009 Function Block Figure3. Function Block Diagram of XL2009 Typical Application Circuit Figure4. XL2009 Typical Application Circuit (VIN=8V~36V, VOUT=5V/2.1A) Rev 1.1 www.xlsemi.com 3 Datasheet 3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop XL2009 Ordering Information Package Temperature Range Part Number Lead Free XL2009E1 Marking ID Lead Free XL2009E1 Packing Type 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 Vin VFB VOutput PD Value -0.3 to 40 -0.3 to Vin -0.3 to Vin Internally limited Unit V V V mW Input Voltage Feedback Pin Voltage Output Switch Pin Voltage Power Dissipation Thermal Resistance (SOP8L) (Junction to Ambient, No Heatsink, Free Air) Operating Junction Temperature Storage Temperature Lead Temperature (Soldering, 10 sec) ESD (HBM) RJA 100 ºC/W TJ TSTG TLEAD -40 to 125 -65 to 150 260 >2000 ºC ºC ºC 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. Rev 1.1 www.xlsemi.com 4 Datasheet 3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop XL2009 XL2009 Electrical Characteristics Ta = 25℃;unless otherwise specified. Symbol Parameter Test Condition Min. Typ. Max. Unit 1.225 1.25 1.275 V - 89 - % System parameters test circuit figure4 Feedback Voltage VFB Efficiency ŋ Vin = 8V to 36V, Vout=5V Iload=0.5A to 2.5A Vin=12V ,Vout=5V Iout=2.1A 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 Input operation voltage Quiescent Supply Current Symbol Vin Fosc Output Short Frequency Fosp Min. Typ. Max. Unit 36 V 2.1 5 mA 180 216 KHz 8 Iq Oscillator Frequency Switch Current Limit Test Condition VFB =Vin 144 48 KHz IL VFB =0 4 A Max. Duty Cycle DMAX VFB=0V 100 % Output Power PMOS Rdson VFB=0V, Vin=12V, ISW=3A 60 Rev 1.1 80 mohm www.xlsemi.com 5 Datasheet 3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop XL2009 Typical System Application (VOUT=5V/2.1A) Figure5. XL2009 System Parameters Test Circuit (VIN=8V~36V, VOUT=5V/2.1A) Output voltage VS Output current 5.5 5.0 4.5 Output voltage(V) 4.0 3.5 3.0 VIN=12V,VOUT=5V,RCS=14K VIN=24V,VOUT=5V,RCS=14K 2.5 2.0 1.5 1.0 0.5 0.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Output current(A) Figure6. XL2009 System Output Constant Current Curve Rev 1.1 www.xlsemi.com 6 Datasheet 3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop XL2009 Efficiency VS Load current 100 95 90 85 Efficiency(%) 80 75 Vin=8V,Vout=5V Vin=12V,Vout=5V Vin=24V,Vout=5V Vin=36V,Vout=5V 70 65 60 55 50 45 40 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 Load current(A) Figure7. XL2009 System Efficiency Curve Output current VS RCS 3.0 2.8 2.6 2.4 Output current(A) 2.2 2.0 1.8 1.6 1.4 VIN=12V,VOUT=5V VIN=24V,VOUT=5V IOUT=1.0A,RCS=5K IOUT=1.5A,RCS=8K IOUT=1.8A,RCS=11K IOUT=2.1A,RCS=14K IOUT=2.5A,RCS=16K 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0 2 4 6 8 10 12 14 16 RCS(Kohm) Figure8. RCS VS Output Current Select Curve Rev 1.1 www.xlsemi.com 7 Datasheet 3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop XL2009 Schottky Diode Selection Table Current 1A 3A Surface Through VR (The same as system maximum input voltage) Mount Hole 20V 30V 40V 50V 1N5817 1N5818 1N5819 √ 60V √ 1N5820 1N5821 1N5822 √ MBR320 MBR330 MBR340 MBR350 MBR360 SK32 SK33 SK34 SK36 30WQ03 30WQ04 30WQ05 31DQ03 31DQ04 31DQ05 SR303 SR304 SR305 √ √ √ √ SR302 Rev 1.1 SK35 SR306 www.xlsemi.com 8 Datasheet 3A 180KHz 36V Buck DC to DC Converter With CV/CC Loop XL2009 Package Information SOP8 Package Mechanical Dimensions Rev 1.1 www.xlsemi.com 9