LT8361 Low IQ Boost/SEPIC/ Inverting Converter with 2A, 100V Switch FEATURESDESCRIPTION n Wide Input Voltage Range: 2.8V to 60V The LT®8361 is a current mode DC/DC converter with a n Ultralow Quiescent Current and Low Ripple 100V, 2A switch operating from a 2.8V to 60V input. With Burst Mode ® Operation: IQ = 9µA a unique single feedback pin architecture it is capable of n 2A, 100V Power Switch boost, SEPIC or inverting configurations. Burst Mode n Positive or Negative Output Voltage Programming operation consumes as low as 9µA 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 voltages n BIAS Pin for Higher Efficiency and programmable switching frequencies between 300kHz n Programmable Undervoltage Lockout (UVLO) and 2MHz. A SYNC/MODE pin allows synchronization to n Thermally Enhanced 16-lead MSOP packages an external clock. It can also be used to select between burst or pulse-skip modes of operation with or without APPLICATIONS Spread Spectrum Frequency Modulation for low EMI. n For increased efficiency, a BIAS pin can accept a second Industrial and Automotive n input to supply the INTVCC regulator. Additional features Telecom n include frequency foldback and programmable soft-start Medical Diagnostic Equipment n to control inductor current during startup. Portable Electronics All registered trademarks and trademarks are the property of their respective owners. The LT8361 is available in a thermally enhanced 16-lead MSOP package with four pins removed for high voltage pin spacings. TYPICAL APPLICATION400kHz, 24V Output SEPIC ConverterEfficiency and Power Loss 22µH 1µF 100 2.50 VIN VOUT 90 2.25 4V TO 48V 24V 200mA AT V 80 2.00 4.7µF IN = 5V 22µH EFFICIENCY 10µF 450mA AT VIN = 12V 70 1.75 POWER LOSS (W) VIN SW 550mA AT VIN = 24V 1M 600mA AT VIN = 48V 60 1.50 EN/UVLO FBX 50 1.25 LT8361 BIAS 40 1.00 SYNC/MODE EFFICIENCY (%) INTVCC 30 0.75 POWER LOSS RT SS GND VC 1µF 71.5k 20 0.50 VIN = 12V 10 0.25 121k 16.2k VIN = 48V 0 0 0.22µF 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 6.8nF LOAD CURRENT (A) 8361 TA01b 8361 TA01a D1: DIODES INC. DFLS2100 L1: WURTH ELEKTRONIK WE-DD 7345 744877220 C5: MURATA GRM32ER71H106KA12L Rev 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
