Version 4
SHEET 1 1676 1112
WIRE 192 -16 80 -16
WIRE 432 -16 192 -16
WIRE 592 -16 432 -16
WIRE 912 -16 592 -16
WIRE 80 0 80 -16
WIRE 432 0 432 -16
WIRE 192 32 192 -16
WIRE 912 80 912 -16
WIRE 80 96 80 80
WIRE 432 96 432 80
WIRE 592 96 592 -16
WIRE 192 160 192 112
WIRE 320 160 192 160
WIRE 864 160 704 160
WIRE 304 224 288 224
WIRE 768 224 704 224
WIRE 912 224 912 176
WIRE 912 224 768 224
WIRE 976 224 912 224
WIRE 1040 224 976 224
WIRE 1152 224 1120 224
WIRE 1200 224 1152 224
WIRE 1296 224 1200 224
WIRE 1200 240 1200 224
WIRE 1296 240 1296 224
WIRE 976 256 976 224
WIRE 320 288 304 288
WIRE 768 288 768 224
WIRE 768 288 704 288
WIRE 1200 336 1200 304
WIRE 1296 336 1296 320
WIRE 240 352 208 352
WIRE 320 352 304 352
WIRE 768 352 704 352
WIRE 976 352 976 320
WIRE 912 400 912 224
WIRE 320 416 304 416
WIRE 768 416 704 416
WIRE 224 480 208 480
WIRE 320 480 304 480
WIRE 864 480 704 480
WIRE 768 496 768 416
WIRE 320 544 304 544
WIRE 736 544 704 544
WIRE 320 608 304 608
WIRE 736 608 736 544
WIRE 736 608 704 608
WIRE 1152 608 1152 224
WIRE 1152 608 736 608
WIRE 320 672 304 672
WIRE 720 672 704 672
WIRE 320 736 304 736
WIRE 912 736 912 496
WIRE 912 736 704 736
WIRE 320 800 304 800
WIRE 912 800 912 736
WIRE 912 800 704 800
WIRE 912 832 912 800
WIRE 512 880 512 864
FLAG 512 880 0
FLAG 912 832 0
FLAG 768 560 0
FLAG 976 352 0
FLAG 1296 336 0
FLAG 1200 336 0
FLAG 144 480 0
FLAG 80 96 0
FLAG 208 352 0
FLAG 1296 224 OUT
FLAG 304 800 0
FLAG 304 736 0
FLAG 304 672 0
FLAG 304 608 0
FLAG 304 544 0
FLAG 80 -16 IN
SYMBOL NMOS 864 400 R0
SYMATTR InstName Q1
SYMATTR Value Si4420DY
SYMBOL RES 416 -16 R0
SYMATTR InstName R1
SYMATTR Value 1.5Meg
SYMBOL schottky 752 416 M180
WINDOW 0 45 46 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value 1N5818
SYMBOL cap 752 496 R0
WINDOW 3 38 47 Left 2
SYMATTR Value 4.7µ
SYMATTR InstName C1
SYMBOL schottky 960 320 M180
WINDOW 0 24 72 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
SYMATTR Value 1N5818
SYMBOL nmos 864 80 R0
SYMATTR InstName Q2
SYMATTR Value Si4420DY
SYMBOL ind 1024 240 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value 3.8µ
SYMBOL polcap 1184 240 R0
SYMATTR SpiceLine Rser=50m
SYMATTR InstName C2
SYMATTR Value 470µ
SYMBOL res 320 464 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 2K
SYMBOL cap 208 464 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value .005µ
SYMBOL res 176 16 R0
SYMATTR InstName R3
SYMATTR Value 3.3K
SYMBOL VOLTAGE 80 -16 R0
SYMATTR InstName V1
SYMATTR Value 6
SYMBOL cap 304 336 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C4
SYMATTR Value .001µ
SYMBOL cap 752 288 R0
WINDOW 3 32 49 Left 2
SYMATTR Value .22µ
SYMATTR InstName C5
SYMBOL PowerProducts\\LTC3720 512 448 R0
SYMATTR InstName U1
SYMBOL res 1280 224 R0
SYMATTR InstName Rload
SYMATTR Value .25
TEXT 1016 688 Left 2 !.tran 2m startup