Datasheet LT8228 (Analog Devices) - 3

LT8228
ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1)
DS1, DS2 .. −60V to 100V TOP VIEW DG1 (Note 2) ... DS1 –0.3V to DS1 + 15V SNS1P 1 38 DG1 DG2 (Note 3) ... DS2 –0.3V to DS2 + 15V SNS1N 2 37 DS1 ENABLE, V1D, BIAS ...100V UV1 3 36 V1D SNS1P, SNS2P, SNS1N, SNS2N ..100V FB1 4 35 DG2 IMON1 5 34 DS2 SNS1P – SNS1N, SNS2P – SNS2N ..±0.3V ISET1N 6 33 ENABLE SW (Note 4) .. –5V to 100V ISET2N 7 32 BST DRVCC (Note 5), BST – SW ..15V VC1 8 31 TG TG, BG ... (Note 6) SS 9 30 SW INTVCC (Note 7) ..4V VC2 10 39 29 BIAS ISET1P, ISET1N, ISHARE .. INTV GND CC ISET1P 11 28 DRVCC ISET2P, ISET2N .. INTVCC ISET2P 12 27 BG VC1, VC2, RT, SS, IMON1, IMON2 .. INTVCC IMON2 13 26 TMR FB1, UV1, FB2, UV2 ..5.5V FB2 14 25 REPORT DRXN, SYNC, IGND, FAULT, REPORT ...5.5V UV2 15 24 FAULT Operating Junction Temperature Range RT 16 23 SYNC LT8228E, I (Notes 8, 9) .. –40°C to 125°C ISHARE 17 22 DRXN LT8228H J (Notes 8, 9) .. –40°C to 150°C SNS2P 18 21 INTVCC SNS2N 19 20 IGND Storage Temperature Range .. –65°C to 175°C FE PACKAGE 38-LEAD PLASTIC TSSOP TJMAX = 150°C, θJA = 25°C/W EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT8228EFE#PBF LT8228EFE#TRPBF LT8228FE 38-Lead Plastic TSSOP –40°C to 125°C LT8228IFE#PBF LT8228IFE#TRPBF LT8228FE 38-Lead Plastic TSSOP –40°C to 125°C LT8228HFE#PBF LT8228HFE#TRPBF LT8228FE 38-Lead Plastic TSSOP –40°C to 150°C 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. Rev. 0 For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Buck Efficiency and Operation Typical Performance Characteristics Boost Efficiency and Operation ENABLE, Supply Current and VCC SS Current, Frequency, Thresholds and Driver Protection MOSFET Controller Pin Functions Block Diagram Operation Overview Buck Mode Operation Boost Mode Operation V1 Protection MOSFET Controller Operation V2 Protection MOSFET Controller Operation Mode of Operation (DRXN) Enable and Soft-Start (Enable and SS) Paralleling Multiple Controllers (ISHARE AND IGND) BIAS Supply and VCC Regulators Strong Gate Drivers Frequency Selection, Spread Spectrum and Phase-Locked Loop (RT and SYNC) FAULT Monitoring and REPORT Feature Applications Information Introduction Programming the Switching Frequency Inductor Selection RSNS2 and RIN2 Selection for Peak Inductor Current RSET2P Selection for V2 Output Current Limit (Buck Mode) RSET2N Selection for V2 Input Current Limit (Boost Mode) RMON2 Selection for V2 Current Monitoring RSNS1 and RIN1 Selection RSET1P Selection for V1 Input Current Limit (Buck Mode) RSET1N Selection for V1 Output Current Limit (Boost Mode) RMON1 Selection for V1 Current Monitoring Output Voltage, Input Undervoltage and Output Overvoltage Programming Power MOSFET Selection and Efficiency Considerations Optional Schottky Diode (D2 and D3) Selection Top MOSFET Driver Supply (CBST, DBST) Power Path Capacitor Selection Loop Compensation Inrush Current Control Boost Output Short Protection and Timer FAULT Conditions Soft-Start REPORT Feature Paralleling Multiple LT8228s BIAS, DRVCC, INTVCC and Power Dissipation Thermal Shutdown Pin Clearance/Creepage Consideration Efficiency Considerations PC Board Layout Checklist Design Example Package Description Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Typical Application Related Parts