Version 4
SHEET 1 1228 1028
WIRE 240 128 112 128
WIRE 336 128 240 128
WIRE 432 128 336 128
WIRE 528 128 432 128
WIRE 624 128 528 128
WIRE 112 144 112 128
WIRE 336 160 336 128
WIRE 432 160 432 128
WIRE 528 160 528 128
WIRE 112 240 112 224
WIRE 240 320 240 128
WIRE 256 320 240 320
WIRE 624 320 624 128
WIRE 624 320 608 320
WIRE 256 416 144 416
WIRE 640 416 608 416
WIRE 736 416 720 416
WIRE 848 416 736 416
WIRE 928 416 848 416
WIRE 144 432 144 416
WIRE 736 432 736 416
WIRE 848 432 848 416
WIRE 928 432 928 416
WIRE 256 512 144 512
WIRE 736 512 608 512
WIRE 736 528 736 512
WIRE 848 528 848 496
WIRE 928 528 928 512
WIRE 48 608 -80 608
WIRE 144 608 48 608
WIRE 256 608 144 608
WIRE -80 624 -80 608
WIRE 48 624 48 608
WIRE 144 624 144 608
WIRE 736 624 736 608
WIRE 256 704 144 704
WIRE 624 704 624 320
WIRE 624 704 608 704
WIRE -80 720 -80 704
WIRE 48 720 48 688
WIRE 144 720 144 704
WIRE 240 800 240 320
WIRE 256 800 240 800
WIRE 624 800 608 800
WIRE 736 800 704 800
WIRE 864 800 736 800
WIRE 992 800 864 800
WIRE 144 816 144 800
WIRE 736 816 736 800
WIRE 864 816 864 800
WIRE 992 816 992 800
WIRE 256 896 240 896
WIRE 736 896 608 896
WIRE 736 912 736 896
WIRE 864 912 864 880
WIRE 992 912 992 896
WIRE 320 976 320 960
WIRE 432 976 432 960
WIRE 544 976 544 960
WIRE 736 1008 736 992
FLAG 112 240 0
FLAG -80 720 0
FLAG 144 816 0
FLAG 48 720 0
FLAG 736 624 0
FLAG 848 528 0
FLAG 928 528 0
FLAG 320 976 0
FLAG 432 976 0
FLAG 544 976 0
FLAG 928 416 OUT2
FLAG -80 608 OUT1
FLAG 240 896 0
FLAG 736 1008 0
FLAG 864 912 0
FLAG 992 912 0
FLAG 992 800 OUT3
FLAG 112 128 IN
SYMBOL voltage 112 128 R0
WINDOW 3 26 96 Left 2
SYMATTR Value 3
SYMATTR InstName V1
SYMBOL res 128 608 R0
SYMATTR InstName R1
SYMATTR Value 1Meg
SYMBOL res 128 704 R0
SYMATTR InstName R2
SYMATTR Value 221K
SYMBOL cap 32 624 R0
SYMATTR InstName C2
SYMATTR Value 22µ
SYMBOL ind 624 432 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value 4.7µ
SYMBOL res 720 416 R0
SYMATTR InstName R3
SYMATTR Value 137K
SYMBOL res 720 512 R0
SYMATTR InstName R4
SYMATTR Value 68.1K
SYMBOL cap 832 432 R0
SYMATTR InstName C3
SYMATTR Value 10µ
SYMBOL ind 160 416 M0
WINDOW 0 1 18 Right 2
WINDOW 3 3 78 Right 2
SYMATTR InstName L2
SYMATTR Value 4.7µ
SYMBOL res 912 416 R0
SYMATTR InstName Rload2
SYMATTR Value 3
SYMBOL res -96 608 R0
SYMATTR InstName Rload1
SYMATTR Value 4
SYMBOL PowerProducts\\LTC3521 432 560 R0
SYMATTR InstName U1
SYMBOL ind 608 816 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L3
SYMATTR Value 4.7µ
SYMBOL res 720 800 R0
SYMATTR InstName R5
SYMATTR Value 100K
SYMBOL res 720 896 R0
SYMATTR InstName R6
SYMATTR Value 100K
SYMBOL cap 848 816 R0
SYMATTR InstName C1
SYMATTR Value 10µ
SYMBOL res 976 800 R0
SYMATTR InstName Rload3
SYMATTR Value 2
TEXT 912 992 Left 2 !.tran 750u startup