LT3477 absoluTe MaxiMuM raTings (Note 1) SW Pin Voltage .. 42V Junction Temperature .. 125°C VIN, SHDN Pin Voltage ... 25V Operating Temperature Range (Note 2) FBP, FBN Pin Voltage ... 6V LT3477E ...– 40°C to 85°C VREF Pin Voltage... 6V LT3477I .. –40°C to 125°C RT, VC, SS Pin Voltage ... 6V Storage Temperature Range ...–65°C to 125°C IADJ1, IADJ2 Pin Voltage .. 25V Lead Temperature (Soldering, 10 sec) ISP1, ISP2, ISN1, ISN2 Pin Voltage ...42V TSSOP .. 300°C pin conFiguraTion TOP VIEW TOP VIEW VIN 1 20 NC NC SW SW GND I SN1 RT 2 19 NC 20 19 18 17 16 SHDN 3 18 NC NC 1 15 I SS 4 17 SW SP1 NC 2 14 ISN2 VC 5 16 SW 21 VIN 3 21 13 ISP2 FBN 6 15 GND RT 4 12 IADJ1 FBP 7 14 ISN1 SHDN 5 11 IADJ2 VREF 8 13 ISP1 IADJ2 9 12 ISN2 6 7 8 9 10 IADJ1 10 11 ISP2 SS V C FBN FBP V REF FE PACKAGE UF PACKAGE 20-LEAD PLASTIC TSSOP 20-LEAD (4mm × 4mm) PLASTIC QFN TJMAX = 125°C, θJA = 40°C/W TJMAX = 125°C, θJA = 37°C/W EXPOSED PAD (PIN 21) IS PGND (MUST BE SOLDERED TO PCB) EXPOSED PAD (PIN 21) IS PGND (MUST BE SOLDERED TO PCB) orDer inForMaTion http://www.linear.com/product/LT3477#orderinfoLEAD FREE FINISHTAPE AND REELPART MARKINGPACKAGE DESCRIPTIONTEMPERATURE RANGE LT3477EFE#PBF LT3477EFE#TRPBF 20-Lead Plastic TSSOP –40°C to 85°C LT3477IFE#PBF LT3477IFE#TRPBF 20-Lead Plastic TSSOP –40°C to 125°C LT3477EUF#PBF LT3477EUF#TRPBF 3477 20-Lead (4mm × 4mm) Plastic QFN –40°C to 85°C LT3477IUF#PBF LT3477IUF#TRPBF 3477 20-Lead (4mm × 4mm) Plastic QFN –40°C to 125°C Consult LTC Marketing for parts specified with wider operating temperature ranges. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix. 3477fd 2 For more information www.linear.com/LT3477 Document Outline Description Typical Application Absolute Maximum Ratings Electrical Characteristics Typical Performance Characteristics Pin Functions Package Description Typical Application Related Parts