POWER LOSS (W) LT8331 Low I Boost/SEPIC/ Q Flyback/Inverting Converter with 0.5A, 140V Switch FEATURES DESCRIPTION n Wide Input Voltage Range: 4.5V to 100V The LT 8331 is a current mode DC/DC converter with a n Ultralow Quiescent Current and Low Ripple 140V, 0.5A switch operating from a 4.5V to 100V input. BurstMode Operation: I = 6A With a unique single feedback pin architecture, it is ca- Q n 0.5A, 140V Power Switch pable of boost, SEPIC, flyback or inverting configurations. n Positive or Negative Output Voltage Programming BurstMode operation consumes as low as 6A quiescent with a Single Feedback Pin current to maintain high efficiency at very low output cur- n Programmable Frequency (100kHz to 500kHz) rents, while keeping typical output ripple below 20mV. n Synchronizable to an External Clock The internally-compensated current mode architecture n BIAS Pin for Higher Efficiency results in stable operation over a wide range of input and n Programmable Undervoltage Lockout (UVLO) output voltages and programmable switching frequencies n Thermally-Enhanced High Voltage MSOP Package between 100kHz to 500kHz. A SYNC/MODE pin allows synchronization to an external clock. It can also be used to APPLICATIONS select between burst or pulse-skipping modes of operation. For increased efficiency, a BIAS pin can accept a second n Industrial and Automotive input to supply the INTV regulator. Additional features CC n Telecom include frequency foldback and programmable soft-start n Medical Diagnostic Equipment for controlling inductor current during start-up. n Portable Electronics The LT8331 is available in a thermally-enhanced MSOP package with four pins removed for high voltage spacings. L, LT, LTC, LTM, Linear Technology, the Linear logo, and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 48V Output SEPIC Converter Efficiency and Power Loss 2.2F 220H 100 2.0 V V = 48V IN OUT 90 36V TO 150mA AT V = 36V IN 1F 4.7F 80 72V 165mA AT V = 48V IN 220H 2 EFFICIENCY 1.5 4 V SW1-2 190mA AT V = 72V 1M IN IN 70 LT8331 60 EN/UVLO POWER LOSS 1M 50 1.0 SYNC/MODE FBX 40 30 GND BIAS V OUT 0.5 20 59k V = 36V 34.8k IN INTV V = 48V RT SS CC IN 10 V = 72V IN 1F 63.4k 0.1F 0 0 0 50 100 150 200 8331 TA01a LOAD CURRENT (mA) 450kHz 8331 TA01b 8331fa 1 For more information www.linear.com/LT8331 EFFICIENCY (%)LT8331 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW SW ..........................................................................140V 1 EN/UVLO 16 SW1 V , EN/UVLO ..........................................................100V IN 3 V 14 SW2 IN 17 BIAS ..........................................................................60V PGND, 5 INTV 12 SYNC/MODE CC GND NC 6 11 SS EN/UVLO Pin Above V Pin, SYNC.............................6V IN 7 BIAS 10 RT NC 8 9 FBX INTV (Note 2) ..........................................................4V CC MSE PACKAGE FBX ...........................................................................4V VARIATION: MSE16 (12) Operating Junction Temperature (Note 3) 16-LEAD PLASTIC MSOP = 45C/W, = 10C/W JA JC LT8331E, LT8331I .............................. 40C to 125C EXPOSED PAD (PIN 17) IS PGND AND GND, MUST BE SOLDERED TO PCB Storage Temperature Range .................. 65C to 150C Lead Temperature (Soldering, 10 sec) ...................300C ORDER INFORMATION