XL4301

XLSEMI Datasheet 3A 180KHz 45V Buck DC/DC Converter With Constant Current Loop XL4301 Features General Description „ „ „ „ „ „ „ „ „ „ „ „ „ The XL4301 is a 180KHz 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. Operation Voltage from 8V to 40V Adjust VOUT from 1.25V to VIN-2V Minimum Drop Out 0.3V Fixed 180KHz Switching Frequency Maximum 3A Switching Current Internal Optimize Power MOSFET Excellent line and load regulation With output constant current loop Built in thermal shutdown function Built in current limit function Built in output cable compensation Recommend output power less than 13W SOP8-EP (Exposed PAD) package Applications The PWM control circuit is able to adjust the duty ratio linearly from 0 to 100%. An enable function, an over current protection function is built inside. An internal compensation block is built in to minimize external component count. „ „ „ „ „ „ The XL4301 built in a simple, user-programmable output cable voltage drop compensation function. Use the curve in Table 2 to choose the proper compensation resistance values for cable compensation. Car Charger Battery Charger LCD Monitor and LCD TV Portable instrument power supply Telecom / Networking Equipment Buck constant current driver Figure1. Package Type of XL4301 Rev1.0 www.xlsemi.com 1 XLSEMI Datasheet 3A 180KHz 45V Buck DC/DC Converter With Constant Current Loop XL4301 Pin Configurations The back exposed PAD is SW. Figure2. Pin Configuration of XL4301 (Top View) Table 1. Pin Description Pin Number 1 Pin Name NC 2 SW 3 GND 4 FB 5 6 CS LC 7 VC 8 VIN Description Not connected. Power Switch Output Pin (SW). Output is the switch node that supplies power to the output. (Note: Connected the back exposed PAD to SW.) Ground Pin. Feedback Pin (FB). Through an external resistor divider network, Feedback senses the output voltage and regulates it. The feedback threshold voltage is 1.25V. Output Current Sense Pin (Iload=0.11V/Rcs). Output cable compensation. Internal Voltage Regulator Bypass Capacity. In typical system application, The VC pin connect a 1uF capacity to VIN. Supply Voltage Input Pin. XL4301 operates from a 8V to 40V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input. Rev1.0 www.xlsemi.com 2 XLSEMI Datasheet 3A 180KHz 45V Buck DC/DC Converter With Constant Current Loop XL4301 Function Block Figure3. Function Block Diagram of XL4301 Typical Application Circuit (Car Charger) Figure4. XL4301 Typical Application Circuit Rev1.0 www.xlsemi.com 3 XLSEMI Datasheet 3A 180KHz 45V Buck DC/DC Converter With Constant Current Loop XL4301 Ordering Information Order Information XL4301E1 Marking ID XL4301E1 Package Type SOP8-EP Packing Type Supplied As 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 -0.3 to 45 -0.3 to Vin -0.3 to Vin Internally limited Unit V V V mW Input Voltage Vin FB Pin Voltage VFB SW Pin Voltage VSW Power Dissipation PD Thermal Resistance 60 ºC/W RJA (Junction to Ambient, No Heatsink, Free Air) Maximum Junction Temperature -40 to 150 ºC TJ Operating Junction Temperature -40 to 125 ºC TJ -65 to 150 ºC Storage Temperature TSTG 260 ºC Lead Temperature (Soldering, 10 sec) TLEAD 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. Rev1.0 www.xlsemi.com 4 XLSEMI Datasheet 3A 180KHz 45V Buck DC/DC Converter With Constant Current Loop XL4301 XL4301 Electrical Characteristics Ta = 25℃;unless otherwise specified. Symbol Parameter Test Condition Min. Typ. Max. Unit 1.231 1.25 1.269 V - 88 - % System parameters test circuit figure4 Feedback Voltage VFB Efficiency ŋ Vin = 8V to 40V, Vout=5V Iload=0.2A to 2A Vin=12V ,Vout=5V Iout=2.5A 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 VIN operation voltage VIN UVLO Quiescent Supply Current Symbol Test Condition Vin Min. 8 Vuvlo Iq Typ. Max. Unit 40 V 5 VFB =Vin 2 5 mA 180 225 KHz Oscillator Frequency Fosc Switch Current Limit IL VFB =0 3.5 Output Power PMOS Rdson VFB=0V, Vin=12V, ISW=3A 75 100 mohm 110 115.5 mV Constant current sense Voltage Thermal Shutdown temperature Thermal Shutdown Hysteresis 153 V VCS 104.5 OTP Rev1.0 A 165 ºC 40 ºC www.xlsemi.com 5 XLSEMI Datasheet 3A 180KHz 45V Buck DC/DC Converter With Constant Current Loop XL4301 Typical System Application (Car Charger) Figure5. XL4301 System Parameters Test Circuit (VIN=8V~40V, VOUT=5V/0.1A~2.5A) Efficiency VS Output current Output voltage VS Output current 5.5 100 5.0 95 4.5 90 85 80 3.5 Efficiency(%) Output voltage(V) 4.0 VIN=8V,VOUT=5V,IOUT=0.1A~2.8A VIN=12V,VOUT=5V,IOUT=0.1A~2.8A VIN=24V,VOUT=5V,IOUT=0.1A~2.8A VIN=36V,VOUT=5V,IOUT=0.1A~2.8A 3.0 2.5 2.0 1.5 75 70 65 VIN=8V,VOUT=5V,IOUT=0.1A~2.5A VIN=12V,VOUT=5V,IOUT=0.1A~2.5A VIN=24V,VOUT=5V,IOUT=0.1A~2.5A VIN=36V,VOUT=5V,IOUT=0.1A~2.5A 60 55 1.0 50 0.5 45 0.0 40 0.00 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 2.6 2.8 3.0 0.25 0.50 0.75 Output current(A) 1.00 1.25 1.50 1.75 2.00 2.25 2.50 Output current(A) Figure6. Output Constant Current Curve Figure7. Efficiency Curve FEEDBACK VOLTAGE CHANGE VS TEMPERATURE Output voltage VS Output current 5.3 3.0 2.5 FEEDBACK VOLTAGE CHANGE(%) 5.2 Output voltage(V) 5.1 5.0 VIN=8V,VOUT=5V,IOUT=0.1A~2.5A VIN=12V,VOUT=5V,IOUT=0.1A~2.5A VIN=24V,VOUT=5V,IOUT=0.1A~2.5A VIN=36V,VOUT=5V,IOUT=0.1A~2.5A 4.9 4.8 VIN=12V,VOUT=5V,IOUT=1.0A Normalized at TA=25℃ 2.0 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 4.7 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 -50 2.6 -25 0 25 50 75 100 125 TEMPERATURE(℃) Output current(A) Figure8. Line&Load regulation Curve Figure9. Feedback voltage Curve Rev1.0 www.xlsemi.com 6 XLSEMI Datasheet 3A 180KHz 45V Buck DC/DC Converter With Constant Current Loop XL4301 Typical System Application (Car Charger, Output cable loss compensation) Figure10. XL4301 System Parameters Test Circuit (VIN=8V~40V, VOUT=5V/0.1A~2.5A) Output voltage VS Output current 5.8 5.7 5.6 5.5 Output voltage(V) 5.4 5.3 5.2 5.1 5.0 4.9 VIN=12V,VOUT=5V,IOUT=0.1A~2.5A,R3=10K VIN=12V,VOUT=5V,IOUT=0.1A~2.5A,R3=20K VIN=12V,VOUT=5V,IOUT=0.1A~2.5A,R3=39K VIN=12V,VOUT=5V,IOUT=0.1A~2.5A,R3=∞ 4.8 4.7 4.6 4.5 4.4 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 2.6 Output current(A) Figure11. Output Cable Loss Compensation Curve Rev1.0 www.xlsemi.com 7 XLSEMI Datasheet 3A 180KHz 45V Buck DC/DC Converter With Constant Current Loop Table 2.Compensation Resistor(R3) and RCS Selection Output Cable Loss IOUT(A) R3(KΩ) Compensation Percent 0 Floating 1% 105 1 5% 17.2 10% 7 0 Floating 2.1 5% 22.1 10% 8.2 0 Floating 2.4 5% 23.7 10% 8.98 XL4301 RCS(mΩ) 91 92 95.3 100 47.8 50 52.3 42.3 43.2 45.5 Schottky Diode Selection Table Current Surface Through VR (The same as system maximum input voltage) Mount Hole 20V 30V 40V 50V 1A 3A √ 1N5817 1N5818 1N5819 √ 1N5820 1N5821 1N5822 √ MBR320 MBR330 MBR340 MBR350 MBR360 SK32 SK33 SK34 SK36 30WQ03 30WQ04 30WQ05 31DQ03 31DQ04 31DQ05 SR305 SR306 √ √ √ 5A √ √ 60V SK35 √ SR302 SR303 SR304 √ 1N5823 1N5824 1N5825 √ SR502 SR503 SR504 SR505 SR506 √ SB520 SB530 SB540 SB550 SB560 SK52 SK53 SK54 SK55 SK56 50WQ03 50WQ04 50WQ05 Rev1.0 www.xlsemi.com 8 XLSEMI Datasheet 3A 180KHz 45V Buck DC/DC Converter With Constant Current Loop XL4301 Package Information (SOP8-EP) Rev1.0 www.xlsemi.com 9 XLSEMI Datasheet 3A 180KHz 45V Buck DC/DC Converter With Constant Current Loop XL4301 Important Notice XLSEMI reserve the right to make modifications, enhancements, improvements, corrections or other changes without notice at any time. XLSEMI does not assume any liability arising out of the application or use of any product described herein; neither does it convey any license under its patent rights, nor the rights of others. XLSEMI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and applications using XLSEMI components. To minimize the risks associated with Buyers’ products and applications, Buyers should provide adequate design and operating safeguards. XLSEMI warrants performance of its products to the specifications applicable at the time of sale, in accordance with the warranty in XLSEMI’s terms and conditions of sale of semiconductor products. Testing and other quality control techniques are used to the extent XLSEMI deems necessary to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarily performed. For the latest product information, go to www.xlsemi.com. 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