LT8302/LT8302-3 42V Micropower No-Opto IN Isolated Flyback Converter with 65V/3.6A Switch FEATURES DESCRIPTION n 3V to 42V Input Voltage Range The LT 8302/LT8302-3 is a monolithic micropower iso- n 3.6A, 65V Internal DMOS Power Switch lated flyback converter. By sampling the isolated output n Low Quiescent Current: voltage directly from the primary-side flyback waveform, n 106A in Sleep Mode the part requires no third winding or opto-isolator for n 380A in Active Mode regulation. The output voltage is programmed with two n Quasi-Resonant Boundary Mode Operation at external resistors and a third optional temperature com- Heavy Load pensation resistor. 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 No Transformer Third Winding or Opto-Isolator at light load while minimizing the output voltage ripple. A Required for Output Voltage Regulation 3.6A, 65V DMOS power switch is integrated along with all n Accurate EN/UVLO Threshold and Hysteresis the high voltage circuitry and control logic into a thermally n Internal Compensation and Soft-Start enhanced 8-lead SO package. n Temperature Compensation for Output Diode The LT8302/LT8302-3 operates from an input voltage n Output Short-Circuit Protection range of 3V to 42V and delivers up to 18W of isolated n Thermally Enhanced 8-Lead SO Package output power. The high level of integration and the use of n AEC-Q100 Qualified for Automotive Applications boundary and low ripple burst modes result in a simple to use, low component count, and high efficiency application APPLICATIONS solution for isolated power delivery. n All registered trademarks and trademarks are the property of their respective owners. Protected Isolated Automotive, Industrial, Medical by U.S. patents, including 5438499, 7463497, 7471522. PowerSupplies n Isolated Auxiliary/Housekeeping Power Supplies TYPICAL APPLICATION 3V to 32V /5V Isolated Flyback Converter Efficiency vs Load Current IN OUT 90 + V V IN OUT 3V TO 32V 3:1 5V 470pF 85 220F 9H 1H 39 V IN 80 10F EN/UVLO SW V OUT LT8302/LT8302-3 154k 75 GND R 10mA TO 1.1A (V = 5V) FB IN 10mA TO 2.0A (V = 12V) IN R 70 INTV CC REF 10mA TO 2.9A (V = 24V) IN 1F 115k 10k V = 5V IN 65 TC V = 12V 8302 TA01a IN V = 24V IN 60 0 1.5 2.0 2.5 3.0 0.5 1.0 LOAD CURRENT (A) 8302 TA01b Rev. G 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LT8302/LT8302-3 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) SW (Note 2) ..............................................................65V TOP VIEW V ............................................................................42V IN EN/UVLO ....................................................................V EN/UVLO 1 8 TC IN R ........................................................V 0.5V to V INTV 2 7 R FB IN IN CC REF 9 GND Current Into R ....................................................200A V 3 6 R FB IN FB INTV , R , TC .........................................................4V GND 4 5 SW CC REF Operating Junction Temperature Range (Notes 3, 4) S8E PACKAGE 8-LEAD PLASTIC SO LT8302E, LT8302E-3 ......................... 40C to 125C = 33C/W JA LT8302I, LT8302I-3 ........................... 40C to 125C EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB LT8302J, LT8302J-3 .......................... 40C to 150C LT8302H, LT8302H-3 ........................ 40C to 150C LT8302MP ......................................... 55C to 150C Storage Temperature Range .................. 65C to 150C Lead Temperature (Soldering, 10 sec) ...................300C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT8302ES8E PBF LT8302ES8E TRPBF 8302 8-Lead Plastic SO 40C to 125C LT8302IS8E PBF LT8302IS8E TRPBF 8302 8-Lead Plastic SO 40C to 125C LT8302JS8E PBF LT8302JS8E TRPBF 8302 8-Lead Plastic SO 40C to 150C LT8302HS8E PBF LT8302HS8E TRPBF 8302 8-Lead Plastic SO 40C to 150C LT8302MPS8E PBF LT8302MPS8E TRPBF 8302 8-Lead Plastic SO 55C to 150C LT8302ES8E-3 PBF LT8302ES8E-3 TRPBF 83023 8-Lead Plastic SO 40C to 125C LT8302IS8E-3 PBF LT8302IS8E-3 TRPBF 83023 8-Lead Plastic SO 40C to 125C LT8302JS8E-3 PBF LT8302JS8E-3 TRPBF 83023 8-Lead Plastic SO 40C to 150C LT8302HS8E-3 PBF LT8302HS8E-3 TRPBF 83023 8-Lead Plastic SO 40C to 150C AUTOMOTIVE PRODUCTS** LT8302ES8E WPBF LT8302ES8E WTRPBF 8302 8-Lead Plastic SO 40C to 125C LT8302IS8E WPBF LT8302IS8E WTRPBF 8302 8-Lead Plastic SO 40C to 125C LT8302JS8E WPBF LT8302JS8E WTRPBF 8302 8-Lead Plastic SO 40C to 150C LT8302HS8E WPBF LT8302HS8E WTRPBF 8302 8-Lead Plastic SO 40C to 150C LT8302ES8E-3 WPBF LT8302ES8E-3 WTRPBF 83023 8-Lead Plastic SO 40C to 125C LT8302IS8E-3 WPBF LT8302IS8E-3 WTRPBF 83023 8-Lead Plastic SO 40C to 125C LT8302JS8E-3 WPBF LT8302JS8E-3 WTRPBF 83023 8-Lead Plastic SO 40C to 150C LT8302HS8E-3 WPBF LT8302HS8E-3 WTRPBF 83023 8-Lead Plastic SO 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. **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. Rev. G 2 For more information www.analog.com