Version 4 SHEET 1 2020 1012 WIRE -208 16 -320 16 WIRE -128 16 -208 16 WIRE -96 16 -128 16 WIRE 96 16 -96 16 WIRE -320 32 -320 16 WIRE -208 32 -208 16 WIRE 96 32 96 16 WIRE -96 80 -96 16 WIRE -64 80 -96 80 WIRE 320 80 256 80 WIRE 560 80 400 80 WIRE -320 128 -320 112 WIRE -208 128 -208 96 WIRE -128 176 -128 16 WIRE -64 176 -128 176 WIRE 560 176 560 80 WIRE 560 176 256 176 WIRE -144 272 -176 272 WIRE -64 272 -80 272 WIRE 288 272 256 272 WIRE -160 368 -176 368 WIRE -64 368 -80 368 WIRE 288 368 288 336 WIRE 288 368 256 368 WIRE 352 368 288 368 WIRE 448 368 432 368 WIRE 560 368 560 176 WIRE 560 368 448 368 WIRE 656 368 560 368 WIRE 448 384 448 368 WIRE 560 384 560 368 WIRE 656 384 656 368 WIRE 448 464 256 464 WIRE 448 480 448 464 WIRE 560 480 560 448 WIRE 656 480 656 464 WIRE -240 560 -256 560 WIRE -160 560 -176 560 WIRE -64 560 -80 560 WIRE 272 560 256 560 WIRE 352 560 336 560 WIRE 448 576 448 560 WIRE 96 624 96 608 FLAG 96 624 0 FLAG -176 368 0 FLAG 448 576 0 FLAG 560 480 0 FLAG 656 480 0 FLAG -320 128 0 FLAG -320 16 IN FLAG 656 368 OUT FLAG -208 128 0 FLAG -176 272 0 FLAG -256 560 0 FLAG 352 560 0 SYMBOL ind 336 384 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L2 SYMATTR Value 3.3µ SYMBOL res 432 368 R0 SYMATTR InstName R4 SYMATTR Value 316K SYMBOL res 432 464 R0 SYMATTR InstName R5 SYMATTR Value 102K SYMBOL res -64 352 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 45.3K SYMBOL cap 544 384 R0 WINDOW 3 24 60 Left 2 SYMATTR Value 47µ SYMATTR InstName C4 SYMBOL res 640 368 R0 SYMATTR InstName Rload SYMATTR Value 3.3 SYMBOL cap 272 272 R0 SYMATTR InstName C5 SYMATTR Value 0.68µ SYMBOL voltage -320 16 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 36 SYMBOL cap -224 32 R0 SYMATTR InstName C1 SYMATTR Value 10µ SYMBOL PowerProducts\\LT3690 96 272 R0 SYMATTR InstName U1 SYMBOL cap -80 256 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value 0.47µ SYMBOL res -64 544 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 21.5K SYMBOL cap -176 544 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C6 SYMATTR Value 680p SYMBOL res 416 64 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 100K SYMBOL cap 272 576 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName C3 SYMATTR Value 1000p TEXT -448 632 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 © 2011 Linear Technology Inc. All rights reserved. TEXT 168 0 Bottom 2 ;LT3690 - 36V, 4A. 1.5MHz Synchronous Step-Down Switching Regulator with 70µA Quiescent Current\nInput: 12V Output: 3.3V @ 4A TEXT 568 600 Left 2 !.tran 800u startup