Datasheet LT8645S, LT8646S (Analog Devices) - 2
| Manufacturer | Analog Devices |
| Description | 65V, 8A Synchronous Step-Down Silent Switcher 2 with 2.5μA Quiescent Current |
| Pages / Page | 30 / 2 — (Note 1). LT8645S. LT8646S. TOP VIEW. … |
| File Format / Size | PDF / 457 Kb |
| Document Language | English |
(Note 1). LT8645S. LT8646S. TOP VIEW. http://www.linear.com/product/LT8645S#orderinfo. MSL. PART NUMBER. PART MARKING*. FINISH CODE
Text Version of Document
LT8645S/LT8646S ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN, EN/UV ..65V Operating Junction Temperature Range (Note 2) PG ...42V LT8645SE/LT8646SE ... –40°C to 125°C BIAS ..25V LT8645SI/LT8646SI... –40°C to 125°C FB, TR/SS . ...4V Storage Temperature Range .. –65°C to 150°C SYNC/MODE Voltage . ..6V Maximum Reflow (Package Body) Temperature ...260°C PIN CONFIGURATION
LT8645S LT8646S TOP VIEW TOP VIEW
FB PG GND TR/SS SYNC/MODE CLKOUT FB PG V C TR/SS SYNC/MODE CLKOUT 32 31 30 29 28 27 32 31 30 29 28 27 BIAS 1 26 RT BIAS 1 26 RT INTV 2 25 CC EN/UV INTV 2 25 CC EN/UV 33 34 33 34 NC 3 GND GND 24 NC NC 3 GND GND 24 NC V 4 23 IN VIN V 4 23 IN VIN V 5 22 IN VIN V 5 22 IN VIN 35 36 35 36 V 6 GND GND 21 GND GND IN VIN V 6 21 IN VIN NC 7 20 NC NC 7 20 NC GND 8 19 GND GND 8 19 GND 37 38 37 38 GND 9 GND GND 18 GND GND 9 GND GND 18 GND GND 10 17 GND GND 10 17 GND 11 12 13 14 15 16 11 12 13 14 15 16 BST SW SW SW SW SW BST SW SW SW SW SW LQFN PACKAGE LQFN PACKAGE 32-LEAD (6mm × 4mm × 0.94mm) 32-LEAD (6mm × 4mm × 0.94mm) JEDEC BOARD: θJA = 31°C/W, θJC(PAD) = 6°C/W (NOTE 3) JEDEC BOARD: θJA = 31°C/W, θJC(PAD) = 6°C/W (NOTE 3) DEMO BOARD: θJA = 21°C/W DEMO BOARD: θJA = 21°C/W EXPOSED PADS (PINS 33-38) ARE GND, SHOULD BE SOLDERED TO PCB EXPOSED PADS (PINS 33-38) ARE GND, SHOULD BE SOLDERED TO PCB ORDER INFORMATION
http://www.linear.com/product/LT8645S#orderinfo MSL PART NUMBER PART MARKING* FINISH CODE PAD FINISH PACKAGE TYPE** RATING TEMPERATURE RANGE
LT8645SEV#PBF 8645SV LT8645SIV#PBF e4 Au (RoHS) LQFN (Laminate Package with QFN Footprint) 3 –40°C to 125°C LT8646SEV#PBF 8646SV LT8646SIV#PBF • Consult Marketing for parts specified with wider operating temperature • Terminal Finish Part Marking: www.linear.com/leadfree ranges. *Device temperature grade is indicated by a label on the shipping • Recommended PCB Assembly and Manufacturing Procedures: container. www.linear.com/umodule/pcbassembly • Pad finish code is per IPC/JEDEC J-STD-609. • Package and Tray Drawings: www.linear.com/packaging Parts ending with PBF are RoHS and WEEE compliant. **The LT8645S/LT8646S package has the same footprint as a standard 6mm × 4mm QFN Package. 8645Sfa 2 For more information www.linear.com/LT8645S
(Note 1)
VIN, EN/UV ..65V Operating Junction Temperature Range (Note 2) PG ...42V LT8645SE/LT8646SE ... –40°C to 125°C BIAS ..25V LT8645SI/LT8646SI... –40°C to 125°C FB, TR/SS . ...4V Storage Temperature Range .. –65°C to 150°C SYNC/MODE Voltage . ..6V Maximum Reflow (Package Body) Temperature ...260°C PIN CONFIGURATION
LT8645S LT8646S TOP VIEW TOP VIEW
FB PG GND TR/SS SYNC/MODE CLKOUT FB PG V C TR/SS SYNC/MODE CLKOUT 32 31 30 29 28 27 32 31 30 29 28 27 BIAS 1 26 RT BIAS 1 26 RT INTV 2 25 CC EN/UV INTV 2 25 CC EN/UV 33 34 33 34 NC 3 GND GND 24 NC NC 3 GND GND 24 NC V 4 23 IN VIN V 4 23 IN VIN V 5 22 IN VIN V 5 22 IN VIN 35 36 35 36 V 6 GND GND 21 GND GND IN VIN V 6 21 IN VIN NC 7 20 NC NC 7 20 NC GND 8 19 GND GND 8 19 GND 37 38 37 38 GND 9 GND GND 18 GND GND 9 GND GND 18 GND GND 10 17 GND GND 10 17 GND 11 12 13 14 15 16 11 12 13 14 15 16 BST SW SW SW SW SW BST SW SW SW SW SW LQFN PACKAGE LQFN PACKAGE 32-LEAD (6mm × 4mm × 0.94mm) 32-LEAD (6mm × 4mm × 0.94mm) JEDEC BOARD: θJA = 31°C/W, θJC(PAD) = 6°C/W (NOTE 3) JEDEC BOARD: θJA = 31°C/W, θJC(PAD) = 6°C/W (NOTE 3) DEMO BOARD: θJA = 21°C/W DEMO BOARD: θJA = 21°C/W EXPOSED PADS (PINS 33-38) ARE GND, SHOULD BE SOLDERED TO PCB EXPOSED PADS (PINS 33-38) ARE GND, SHOULD BE SOLDERED TO PCB ORDER INFORMATION
http://www.linear.com/product/LT8645S#orderinfo MSL PART NUMBER PART MARKING* FINISH CODE PAD FINISH PACKAGE TYPE** RATING TEMPERATURE RANGE
LT8645SEV#PBF 8645SV LT8645SIV#PBF e4 Au (RoHS) LQFN (Laminate Package with QFN Footprint) 3 –40°C to 125°C LT8646SEV#PBF 8646SV LT8646SIV#PBF • Consult Marketing for parts specified with wider operating temperature • Terminal Finish Part Marking: www.linear.com/leadfree ranges. *Device temperature grade is indicated by a label on the shipping • Recommended PCB Assembly and Manufacturing Procedures: container. www.linear.com/umodule/pcbassembly • Pad finish code is per IPC/JEDEC J-STD-609. • Package and Tray Drawings: www.linear.com/packaging Parts ending with PBF are RoHS and WEEE compliant. **The LT8645S/LT8646S package has the same footprint as a standard 6mm × 4mm QFN Package. 8645Sfa 2 For more information www.linear.com/LT8645S
