POWER LOSS (W) LT8333 Low I Boost/SEPIC/Inverting Q Converter with 3A, 40V Switch FEATURES DESCRIPTION n Wide Input Voltage Range: 2.8V to 40V The LT 8333 is a current mode DC/DC converter with a n Ultralow Quiescent Current and Low Ripple 40V, 3A switch operating from a 2.8V to 40V input. With n Burst Mode Operation: I = 9A a unique single feedback pin architecture, it is capable Q n 3A, 40V Power Switch of boost, SEPIC or inverting configurations. Burst Mode n Positive or Negative Output Voltage Programming operation consumes as low as 9A quiescent current to with a Single Feedback Pin maintain high efficiency at very low output currents, while n Programmable Frequency (300kHz to 2MHz) keeping typical output ripple below 15mV. n Synchronizable to an External Clock An external compensation pin allows optimization of loop n Spread Spectrum Frequency Modulation for Low EMI bandwidth over a wide range of input and output volt- n Bias Pin for Higher Efficiency ages and programmable switching frequencies between n Programmable Undervoltage Lockout (UVLO) 300kHz and 2MHz. A SYNC/MODE pin allows synchroni- n Overcurrent and Overtemperature Protection zation to an external clock. It can also be used to select n Thermally Enhanced 10-Lead 3mm 3mm between BURST or PULSE SKIP modes of operation with DFNPackage spread spectrum frequency modulation for low EMI. For increased efficiency, a BIAS pin can accept a second input to supply the INTV regulator. Additional features include CC APPLICATIONS frequency foldback and programmable soft-start to con- n Industrial and Automotive trol inductor current during start-up. n Telecom The LT8333 is available in a thermally enhanced 10-lead n Medical Diagnostic Equipment 3mm 3mmDFN package. n Portable Electronics All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION 2MHz, 4V to 19V Input, 24V Output Boost Converter Efficiency and Power Loss 100 3.0 3.3H EFFICIENCY V V OUT IN 95 2.7 24V 4V TO 19V C1 10F 500mA AT V = 5V IN 90 2.4 10F 4.7pF 1M 750mA AT V = 8V IN V SW 2.1 IN 85 1.1A AT V = 12V IN FBX 1.8A AT V = 19V IN 80 1.8 LT8333 EN/UVLO 75 1.5 BIAS 70 1.2 SYNC/MODE INTV CC POWER LOSS 65 0.9 R SS GND V T C V = 5V IN 60 0.6 1F V = 8V IN 71.5k V = 12V 55 IN 0.3 68k V = 19V 20k IN 50 0 0 0.4 0.8 1.2 1.6 2 10nF 330pF LOAD CURRENT (A) 8333 TA01a 8333 TA01b Rev. 0 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LT8333 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW SW ............................................................................40V EN/UVLO 1 10 SW V , EN/UVLO ............................................................40V IN V 2 9 SYNC/MODE IN BIAS ..........................................................................40V 11 INTV 3 8 SS CC GND SYNC ..........................................................................6V BIAS 4 7 RT V 5 6 FBX INTV ............................................................... (Note 2) C CC VC.............................................................................4V DD PACKAGE FBX ...........................................................................4V 10-LEAD (3mm 3mm) PLASTIC DFN = 43C/W JA Operating Junction Temperature Range (Notes 3) EXPOSED PAD (PIN 11) IS PGND AND GND, MUST BE SOLDERED TO PCB LT8333R ........................................... 40C to 150C Storage Temperature Range .................. 65C to 150C Maximum Junction Temperature .........................+150C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT8333RDD PBF LT8333RDD TRPBF LHQJ 10-Lead (3mm 3mm) Plastic DFN 40C to 150C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25C. V = 12V, EN/UVLO = 12V unless otherwise noted. A IN PARAMETER CONDITIONS MIN TYP MAX UNITS V Operating Voltage Range l 2.8 40 V IN V Quiescent Current at Shutdown V = 0.2V 1 2 A IN EN/UVLO l 1 15 A V = 1.5V 2 5 A EN/UVLO l 2 25 A V Quiescent Current IN Sleep Mode (Not Switching) SYNC = 0V 9 15 A l 9 30 A Active Mode (Not Switching) SYNC = 0V or INTV , BIAS = 0V 1200 1600 A CC l 1200 1850 A SYNC = 0V or INTV , BIAS = 5V 22 40 A CC l 22 65 A BIAS Threshold Rising, BIAS Can Supply INTV 4.4 4.65 V CC Falling, BIAS Cannot Supply INTV 4 4.25 V CC V Falling Threshold to Supply INTV BIAS = 12V BIAS 2V V IN CC BIAS Falling Threshold to Supply INTV V = 12V V V CC IN IN FBX Regulation FBX Regulation Voltage FBX > 0V l 1.568 1.6 1.636 V FBX < 0V l 0.822 0.80 0.780 V FBX Line Regulation FBX > 0V, 2.8V < V < 40V 0.005 0.015 %/V IN FBX < 0V, 2.8V < V < 40V 0.005 0.015 %/V IN FBX Pin Current FBX = 1.6V, 0.8V l 10 10 nA Rev. 0 2 For more information www.analog.com