XL1410E1

Datasheet 2A 380KHz 18V Buck DC to DC Converter XL1410 Features General Description „ „ Wide 3.6V to 18V Input Voltage Range Output Adjustable from 1.222V to 16V „ „ Maximum Duty Cycle 100% Minimum Drop Out 0.6V „ „ „ Fixed 380KHz Switching Frequency 2A Constant Output Current Capability Internal Optimize Power MOSFET High efficiency 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. „ „ „ „ „ „ „ „ Excellent line and load regulation TTL shutdown capability EN pin with hysteresis function 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. 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 Figure1. Package Type of XL1410 Rev 1.0 www.xlsemi.com 1 Datasheet 2A 380KHz 18V Buck DC to DC Converter XL1410 Pin Configurations NC 1 VIN 2 8 NC 7 EN XL1410 SW 3 6 NC GND 4 5 FB Figure2. Pin Configuration of XL1410 (Top View) Pin Number 1,6,8 Pin Name NC 2 VIN 3 SW 4 GND 5 FB 7 EN 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. Function Block Figure3. Function Block Diagram of XL1410 Rev 1.0 www.xlsemi.com 2 Datasheet 2A 380KHz 18V Buck DC to DC Converter XL1410 Typical Application Circuit Figure4. XL1410 Typical Application Circuit System Efficiency Curve Rev 1.0 www.xlsemi.com 3 Datasheet 2A 380KHz 18V Buck DC to DC Converter XL1410 Ordering Information Package Temperature Range Part Number Lead Free XL1410E1 XL1410TRE1 Marking ID Lead Free XL1410E1 XL1410E1 Packing Type Tube 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 VEN VOutput PD Value -0.3 to 20 -0.3 to Vin -0.3 to Vin -0.3 to Vin Internally limited Unit V V V V mW 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) 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 2A 380KHz 18V Buck DC to DC Converter XL1410 XL1410 Electrical Characteristics Ta = 25℃;unless otherwise specified. Symbol Parameter Test Condition Min. Typ. Max. Unit System parameters test circuit figure4 Feedback Voltage VFB Efficiency ŋ 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 Symbol Test Condition Min. Typ. 3.6 Max. Unit 18 V Input operation voltage Vin Shutdown Supply Current ISTBY VEN=0V 60 200 uA Quiescent Supply Current Iq VEN =2V, VFB =Vin 3 5 mA 380 437 Khz Oscillator Frequency Fosc Switch Current Limit IL VFB =0 4 A VEN High (Regulator ON) Low (Regulator OFF) 1.4 0.8 V IH VEN =2V (ON) 1 15 uA IL VEN =0V (OFF) 1 15 uA DMAX VFB=0V 100 EN Pin Threshold EN Pin Input Leakage Current Max. Duty Cycle 323 Rev 1.0 % www.xlsemi.com 5 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.) Rev 1.0 www.xlsemi.com 6 Datasheet 2A 380KHz 18V Buck DC to DC Converter XL1410 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 1.0 SK35 SR306 www.xlsemi.com 7 Datasheet 2A 380KHz 18V Buck DC to DC Converter XL1410 Typical System Application for 12V ~ 5V/2A Version 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) Rev 1.0 www.xlsemi.com 8 Datasheet 2A 380KHz 18V Buck DC to DC Converter XL1410 Package Information SOP8 Package Mechanical Dimensions Rev 1.0 www.xlsemi.com 9