Version 4 SHEET 1 2020 904 WIRE 176 160 80 160 WIRE 272 160 176 160 WIRE 560 160 272 160 WIRE 832 160 560 160 WIRE 832 176 832 160 WIRE 80 192 80 160 WIRE 176 192 176 160 WIRE 560 208 560 160 WIRE 320 272 304 272 WIRE 400 272 384 272 WIRE 832 272 832 256 WIRE 832 272 720 272 WIRE 960 272 832 272 WIRE 1104 272 1024 272 WIRE 1152 272 1104 272 WIRE 1248 272 1152 272 WIRE 1344 272 1248 272 WIRE 1344 288 1344 272 WIRE 80 304 80 272 WIRE 176 304 176 256 WIRE 1152 304 1152 272 WIRE 1248 304 1248 272 WIRE 272 352 272 160 WIRE 400 352 272 352 WIRE 784 352 720 352 WIRE 832 400 832 368 WIRE 1152 400 1152 368 WIRE 1248 400 1248 368 WIRE 1344 400 1344 368 WIRE 208 448 160 448 WIRE 336 448 288 448 WIRE 400 448 336 448 WIRE 784 448 720 448 WIRE 912 448 784 448 WIRE 1104 448 1104 272 WIRE 1104 448 992 448 WIRE 336 464 336 448 WIRE 784 464 784 448 WIRE 160 480 160 448 WIRE 560 528 560 512 WIRE 160 560 160 544 WIRE 336 560 336 528 WIRE 784 560 784 544 FLAG 80 160 IN FLAG 304 272 0 FLAG 832 400 0 FLAG 1344 272 OUT FLAG 176 304 0 FLAG 80 304 0 FLAG 160 560 0 FLAG 336 560 0 FLAG 784 560 0 FLAG 560 528 0 FLAG 1152 400 0 FLAG 1248 400 0 FLAG 1344 400 0 SYMBOL voltage 80 176 R0 WINDOW 123 0 0 Left 2 WINDOW 39 12 125 Left 2 SYMATTR InstName V1 SYMATTR Value 3.3 SYMBOL cap 160 192 R0 SYMATTR InstName C1 SYMATTR Value 10u SYMBOL cap 1136 304 R0 SYMATTR InstName C2 SYMATTR Value 47u SYMATTR SpiceLine Rser=5m SYMBOL cap 1232 304 R0 SYMATTR InstName C3 SYMATTR Value 47u SYMATTR SpiceLine Rser=5m SYMBOL PowerProducts\\LTC3872 560 352 R0 SYMATTR InstName U1 SYMBOL cap 144 480 R0 SYMATTR InstName C4 SYMATTR Value 1800p SYMBOL res 304 464 M270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R1 SYMATTR Value 17.4K SYMBOL cap 320 464 R0 SYMATTR InstName C5 SYMATTR Value 47p SYMBOL cap 384 256 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C6 SYMATTR Value 0.0022u SYMBOL ind 816 160 R0 SYMATTR InstName L1 SYMATTR Value 1u SYMATTR SpiceLine Rser=20m SYMBOL nmos 784 272 R0 SYMATTR InstName Q1 SYMATTR Value FDC637AN SYMBOL res 768 448 R0 SYMATTR InstName R2 SYMATTR Value 11K SYMBOL res 1008 432 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 34.8K SYMBOL schottky 960 288 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D1 SYMATTR Value PMEG2020AEA SYMATTR Description Diode SYMATTR Type diode SYMBOL res 1328 272 R0 SYMATTR InstName Rload SYMATTR Value 2.5 TEXT 1048 552 Left 2 !.tran 4.75m startup TEXT 696 144 Bottom 2 ;LTC3872 - No Rsense Current Mode Boost DC/DC Controller\n Input: 3V to 4.5V Output: 5V @ 2A TEXT 8 592 Left 2 ;Note:\n If the simulation model is not found please update with the "Sync Release" command from the "Tools" menu.\n It remains the customer's responsibility to verify proper and reliable operation in the actual application.\n Component substitution and printed circuit board layout may significantly affect circuit performance or reliability\n Contact your local sales representative for assistance. This circuit is distributed to customers only for use with LTC parts\n Copyright © 2006 Linear Technology Inc. All rights reserved.