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| Datasheet 2A 380KHz 18V Buck DC to DC Converter Features Wide 3.6V to 18V Input Voltage Range Output Adjustable from 1.222V to 16V Maximum Duty Cycle 100% Minimum Drop Out 0.6V XL1410 General Description The XL1410 is a 380KHz fixed frequency PWM buck (step-down) DC/DC converter, capable of driving a 2A 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. 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. When short protection function happens, the operation frequency will be reduced from 380KHz to 80KHz. An internal compensation block is built in to minimize external component count. Fixed 380KHz Switching Frequency 2A Constant Output Current Capability Internal Optimize Power MOSFET High efficiency Excellent line and load regulation TTL shutdown capability EN pin with hysteresis function Built in thermal shutdown function Built in current limit function Built in output short protection function Available in SOP8 package Applications LCD Monitor and LCD TV Digital Photo Frame Set-up Box ADSL Modem Telecom / Networking Equipment www..com Figure1. Package Type of XL1410 Rev 1.0 1 www.xlsemi.com Datasheet 2A 380KHz 18V Buck DC to DC Converter Pin Configurations XL1410 XL1410 Figure2. Pin Configuration of XL1410 (Top View) Pin Number 1,6,8 2 3 4 Pin Name NC VIN SW GND Description No Connected. Supply Voltage Input Pin. XL1410 operates from a 3.6V to 18V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input. Power Switch Output Pin (SW). Output 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 XL1410. Feedback Pin (FB). Through an external resistor divider network, Feedback senses the output voltage and regulates it. The feedback threshold voltage is 1.222V. Enable Pin. Drive EN pin low to turn off the device, drive it high to turn it on. Floating is default high. 5 7 FB EN Function Block www..com Figure3. Function Block Diagram of XL1410 Rev 1.0 2 www.xlsemi.com Datasheet 2A 380KHz 18V Buck DC to DC Converter Typical Application Circuit XL1410 Figure4. XL1410 Typical Application Circuit System Efficiency Curve www..com Rev 1.0 3 www.xlsemi.com Datasheet 2A 380KHz 18V Buck DC to DC Converter Ordering Information Part Number Lead Free XL1410E1 XL1410TRE1 Marking ID Lead Free XL1410E1 XL1410E1 Packing Type Tube Tape & Reel XL1410 Package Temperature Range XLSEMI Pb-free products, as designated with "E1" suffix in the par number, are RoHS compliant. Absolute Maximum Ratings Parameter Note1 Symbol Vin VFB VEN VOutput PD RJA TJ TSTG TLEAD Value -0.3 to 20 -0.3 to Vin -0.3 to Vin -0.3 to Vin Internally limited 100 -40 to 125 -65 to 150 260 2000 Unit V V V V mW C/W C C C V Input Voltage Feedback Pin Voltage EN Pin Voltage Output Switch Pin Voltage Power Dissipation Thermal Resistance (SOP8) (Junction to Ambient, No Heatsink, Free Air) Operating Junction Temperature Storage Temperature Lead Temperature (Soldering, 10 sec) ESD (HBM) 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. www..com Rev 1.0 4 www.xlsemi.com Datasheet 2A 380KHz 18V Buck DC to DC Converter XL1410 Electrical Characteristics Ta = 25 ;unless otherwise specified. Parameter Test Condition Min. Typ. Max. Unit Symbol XL1410 System parameters test circuit figure4 VFB Efficiency Feedback Voltage Vin = 7V to 18V, Vout=5V Iload=0.2A to 2A Vin=12V ,Vout=5V Iout=2A 1.186 1.222 1.258 89 V % Electrical Characteristics (DC Parameters) Vin = 12V, GND=0V, Vin & GND parallel connect a 220uf/50V capacitor; Iout=500mA, Ta = 25 ; the others floating unless otherwise specified. Parameters Input operation voltage Shutdown Supply Current Quiescent Supply Current Oscillator Frequency Switch Current Limit EN Pin Threshold EN Pin Input Leakage Current Max. Duty Cycle Symbol Vin ISTBY Iq Fosc IL VEN IH IL DMAX VFB =0 High (Regulator ON) Low (Regulator OFF) VEN =2V (ON) VEN =0V (OFF) VFB=0V VEN=0V VEN =2V, VFB =Vin 323 Test Condition Min. 3.6 60 3 380 4 1.4 0.8 1 1 100 15 15 Typ. Max. 18 200 5 437 Unit V uA mA Khz A V uA uA % www..com Rev 1.0 5 www.xlsemi.com Datasheet 2A 380KHz 18V Buck DC to DC Converter XL1410 Test Circuit and Layout guidelines Figure5. Standard Test Circuits and Layout Guides Select R1 to be approximately 2K, use a 1% resistor for best stability. C1 and CFF are optional; in order to increase stability and reduce the input power line noise, CIN and C1 must be placed near to VIN and GND; For output voltages greater than approximately 10V, an additional capacitor CFF is required. The compensation capacitor is typically between 100 pf and 33 nf, and is wired in parallel with the output voltage setting resistor, R2. It provides additional stability for high output voltage, low input-output voltages, and/or very low ESR output capacitors, such as solid tantalum capacitors. CFF=1/(31*1000*R2); This capacitor type can be ceramic, plastic, silver mica, etc. (Because of the unstable characteristics of ceramic capacitors made with Z5U material, they are not recommended.) www..com Rev 1.0 6 www.xlsemi.com Datasheet 2A 380KHz 18V Buck DC to DC Converter Schottky Diode Selection Table Current Surface Through VR (The same as system maximum input voltage) Mount Hole 20V 30V 40V 50V 1N5817 1N5818 1N5819 1N5820 MBR320 3A SK32 1N5821 MBR330 SK33 30WQ03 31DQ03 SR302 SR303 1N5822 MBR340 MBR350 SK34 31DQ04 SR304 SK35 31DQ05 SR305 SR306 30WQ04 30WQ05 MBR360 SK36 XL1410 60V 1A www..com Rev 1.0 7 www.xlsemi.com Datasheet 2A 380KHz 18V Buck DC to DC Converter Typical System Application for 12V ~ 5V/2A Version XL1410 Figure6. XL1410 System Parameters Test Circuit (12V ~ 5V/2A) Typical System Application for 12V ~ 3.3V/2A Figure7. XL1410 System Parameters Test Circuit (12V ~ 3.3V/2A) www..com Rev 1.0 8 www.xlsemi.com Datasheet 2A 380KHz 18V Buck DC to DC Converter Package Information SOP8 Package Mechanical Dimensions XL1410 www..com Rev 1.0 9 www.xlsemi.com |
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