POWER LOSS (W) LT8331 Low I Boost/SEPIC/Flyback/Inverting Q 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 capa- Q n 0.5A, 140V Power Switch ble 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 n AEC-Q100 Qualified for Automotive Applications synchronization to an external clock. It can also be used to select between burst or pulse-skipping modes of opera- APPLICATIONS tion. For increased efficiency, a BIAS pin can accept a second input to supply the INTV regulator. Additional CC n Industrial and Automotive features include frequency foldback and programmable n Telecom soft-start for controlling inductor current during start-up. n Medical Diagnostic Equipment n Portable Electronics The LT8331 is available in a thermally-enhanced MSOP package with four pins removed for high voltage spacings. All registered trademarks and 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 Rev. C 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LT8331 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) SW ..........................................................................140V TOP VIEW EN/UVLO 1 16 SW1 V , EN/UVLO ..........................................................100V IN V 3 14 SW2 BIAS ..........................................................................60V IN 17 PGND, EN/UVLO Pin Above V Pin, SYNC.............................6V INTV 5 12 SYNC/MODE CC IN GND NC 6 11 SS INTV (Note 2) ..........................................................4V BIAS 7 10 RT CC NC 8 9 FBX FBX ...........................................................................4V MSE PACKAGE Operating Junction Temperature (Note 3) VARIATION: MSE16 (12) 16-LEAD PLASTIC MSOP LT8331E, LT8331I .............................. 40C to 125C = 45C/W, = 10C/W JA JC Storage Temperature Range .................. 65C to 150C EXPOSED PAD (PIN 17) IS PGND AND GND, MUST BE SOLDERED TO PCB Lead Temperature (Soldering, 10 sec) ...................300C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT8331EMSE PBF LT8331EMSE TRPBF 8331 16-Lead Plastic MSOP with 4 Pins Removed 40C to 125C LT8331IMSE PBF LT8331IMSE TRPBF 8331 16-Lead Plastic MSOP with 4 Pins Removed 40C to 125C AUTOMOTIVE PRODUCTS** LT8331EMSE WPBF LT8331EMSE WTRPBF 8331 16-Lead Plastic MSOP with 4 Pins Removed 40C to 125C LT8331IMSE WPBF LT8331IMSE WTRPBF 8331 16-Lead Plastic MSOP with 4 Pins Removed 40C to 125C 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. **Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for thesemodels. ELECTRICAL CHARACTERISTICSThe 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 l V Operating Voltage Range 4.5 100 V IN V Quiescent Current at Shutdown V = 0.2V 1 2 A IN EN/UVLO l 2 5 A V = 1.5V 2.0 5 A EN/UVLO l 3.6 9.5 A V Quiescent Current IN Sleep Mode (Not Switching) SYNC = 0V 5.5 15 A l 8.5 25 A Active Mode (Not Switching) SYNC = 0V, BIAS = 0V 780 1420 A l 840 1720 A SYNC = 0V, BIAS = 5V 17 40 A l 24 55 A SYNC = INTV , BIAS = 0V 700 1080 A CC l 800 1170 A SYNC = INTV , BIAS = 5V 17 40 A CC l 24 55 A Rev. C 2 For more information www.analog.com