XL2012

Datasheet 5V/2.4A 150KHz 40V Buck DC to DC Converter For USB Interface XL2012 Features General Description „ „ „ „ „ „ „ „ „ „ „ The XL2012 is a 150 KHz fixed frequency PWM buck (step-down) DC/DC converter, capable of driving a 2.4A 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. Wide 8V to 40V input voltage range. Fixed 5V output voltage. Maximum 2.4A output current. Fixed 150KHz switching frequency. Internal optimize power MOSFET. High efficiency up to 92%. Built in output short shutdown function. Excellent line and load regulation. Built in thermal shutdown function. Built in current limit function. Available in SOP8L package. The XL2012 built in output short protection function. When short protection function happens, the chip will be shutdown. An internal compensation block is built in to minimize external component count. Applications „ „ „ Car Charger. Battery Charger. USB Power Supply. Figure1. Package Type of XL2012 Rev 1.0 www.xlsemi.com 1 Datasheet 5V/2.4A 150KHz 40V Buck DC to DC Converter For USB Interface XL2012 Pin Configurations Figure2. Pin Configuration of XL2012 (Top View) Table 1 Pin Description Pin Number 1 2 Pin Name FB NC 3 VC 4 VIN 5,6 SW 7,8 GND Description Feedback Pin (FB). The feedback threshold voltage is 5V. No Connected. Internal Voltage Regulator Bypass Capacity. In typical system application, The VC pin connect a 1uf capacity to VIN. Supply Voltage Input Pin. XL2012 operates from 8V to 40V 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 XL2012. Rev 1.0 www.xlsemi.com 2 Datasheet 5V/2.4A 150KHz 40V Buck DC to DC Converter For USB Interface XL2012 Function Block Figure3. Function Block Diagram of XL2012 Typical Application Circuit Figure4. XL2012 Typical Application Circuit (VIN=8V~40V, VOUT=5V/2.4A) Rev 1.0 www.xlsemi.com 3 Datasheet 5V/2.4A 150KHz 40V Buck DC to DC Converter For USB Interface XL2012 Ordering Information Order Information XL2012E1 Marking ID XL2012E1 Package Type SOP8L 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 Vin VFB VOutput PD Value -0.3 to 45 -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 1.0 www.xlsemi.com 4 Datasheet 5V/2.4A 150KHz 40V Buck DC to DC Converter For USB Interface XL2012 XL2012 Electrical Characteristics Ta = 25℃;unless otherwise specified. Symbol Parameter Test Condition Min. Typ. Max. Unit 4.9 5 5.1 V - 89 - % System parameters test circuit figure4 Feedback Voltage VFB Efficiency ŋ Vin = 8V to 40V, Vout=5V Iload=0.5A to 2.4A Vin=12V ,Vout=5V Iout=2.4A Electrical Characteristics (DC Parameters) Vin = 12V, GND=0V, Vin & GND parallel connect a 47uF/50V capacitor; Iout=500mA, Ta = 25℃; the others floating unless otherwise specified. Parameters Input operation voltage Quiescent Supply Current Symbol Test Condition Vin Min. Typ. 8 Iq VFB =Vin 4.7 Output Short Supply Current Iosp Oscillator Frequency Fosc Switch Current Limit IL VFB =0 2.6 Output Power PMOS Rdson VFB=0V, Vin=12V, ISW=2.4A 60 128 Rev 1.0 150 Max. Unit 40 V 10 mA 5 mA 173 KHz A 80 mohm www.xlsemi.com 5 Datasheet 5V/2.4A 150KHz 40V Buck DC to DC Converter For USB Interface XL2012 Typical System Application (VOUT=5V/2.4A) Figure5. XL2012 System Parameters Test Circuit (VIN=8V~40V, VOUT=5V/2.4A) Output voltage VS Output current 5.5 5.0 4.5 Output voltage(V) 4.0 3.5 3.0 VIN=12V,VOUT=5V 2.5 2.0 1.5 1.0 0.5 0.0 0 500 1000 1500 2000 2500 3000 Output current(mA) Figure6. XL2012 System Output Constant Current Curve Rev 1.0 www.xlsemi.com 6 Datasheet 5V/2.4A 150KHz 40V Buck DC to DC Converter For USB Interface XL2012 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. XL2012 System Efficiency Curve Rev 1.0 www.xlsemi.com 7 Datasheet 5V/2.4A 150KHz 40V Buck DC to DC Converter For USB Interface XL2012 Output short shutdown function description The output short shutdown function is built in XL2012. The short protection circuit monitors the output voltage, whenever FB pin voltage is below 1.5V, the short circuit protection circuit is triggered, the converter will be shutdown, input current less than 5mA. When the short fault is removed，if output load is floating, then converter will restart up, the output voltage will return to normal; if output load isn’t floating, then converter must be power reset , the output voltage will comeback. VOUT Swithing Figure8. The converter will be shutdown when output short happen. Input current VS Input voltage 2.0 1.9 1.8 Input current(mA) 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 Input voltage(V) Figure9. The input current curve when output short happen. Rev 1.0 www.xlsemi.com 8 Datasheet 5V/2.4A 150KHz 40V Buck DC to DC Converter For USB Interface XL2012 Package Information SOP8 Package Mechanical Dimensions Rev 1.0 www.xlsemi.com 9