LT8303 100V Micropower Isolated IN Flyback Converter with 150V/450mA Switch Fea T Descrip T n 5.5V to 100V Input Voltage Range The LT 8303 is a micropower high voltage isolated flyback n 450mA, 150V Internal DMOS Power Switch converter. By sampling the isolated output voltage directly n Up to 5W of Output Power from the primary-side flyback waveform, the part requires n Low Quiescent Current: no third winding or opto-isolator for regulation. The output 70A in Sleep Mode voltage is programmed with a single external resistor. 280A in Active Mode Internal compensation and soft-start further reduce external n Boundary Mode Operation at Heavy Load component count. Boundary mode operation provides a n Low Ripple Burst Mode Operation at Light Load small magnetic solution with excellent load regulation. n Minimum Load <0.5% (Typ) of Full Output Low ripple Burst Mode operation maintains high efficiency n V Set with a Single External Resistor at light load while minimizing the output voltage ripple. OUT n No Transformer Third Winding or Opto-Isolator A 450mA, 150V DMOS power switch is integrated along Required for Regulation with all high voltage circuitry and control logic into a 5-lead n Accurate EN/UVLO Threshold and Hysteresis ThinSOT package. n Internal Compensation and Soft-Start The LT8303 operates from an input voltages range of 5.5V n 5-Lead TSOT-23 Package to 100V and can deliver up to 5W of isolated output power. The high level of integration and the use of boundary mode and low ripple Burst Mode operations result in a simple to a T use, low component count, and high efficiency application n Isolated Telecom, Datacom, Automotive, Industrial, solution for isolated power delivery. and Medical Power Supplies L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the n Isolated Auxiliary/Housekeeping Power Supplies property of their respective owners. Protected by U.S. Patents, including 5438499, 7463497, and 7471522. Typical a T 6V to 80V , 5V Isolated Flyback Converter Efficiency vs Load Current IN OUT 100 + T1 V V OUT IN 6:1 5V 6V TO 80V 90 4.7F 150H 4.2H V IN 100F 80 LT8303 EN/UVLO SW V OUT 70 316k 2.5mA TO 0.33A (V = 12V) 60 IN R 2.5mA TO 0.52A (V = 24V) FB IN V = 12V IN 2.5mA TO 0.73A (V = 48V) IN GND V = 24V 50 IN 2.5mA TO 0.84A (V = 72V) IN 8303 TA01a V = 48V IN V = 72V IN 40 0 100 200 300 400 500 600 700 800 900 LOAD CURRENT (mA) 8303 TA01b 8303fa For more information www.linear.com/LT8303 1 EFFICIENCY (%) ion pplica ions pplica ion uresLT8303 a Te Maxi Mu M r a T p in c F T (Note 1) TOP VIEW SW (Note 2) ........................................................... 150V EN/UVLO 1 5 V IN V ......................................................................... 100V IN GND 2 EN/UVLO ................................................................... V IN R 3 4 SW FB R ...................................................... V 0.5V to V FB IN IN S5 PACKAGE Current into R ................................................... 200A FB 5-LEAD PLASTIC TSOT-23 = 215C/W Operating Junction Temperature Range (Notes 3, 4) JA LT8303E, LT8303I ............................. 40C to 125C LT8303H ............................................ 40C to 150C Storage Temperature Range .............. 65C to 150C o r Der i n F Ma T