Version 4
SHEET 1 1532 712
WIRE 208 64 112 64
WIRE 576 64 208 64
WIRE 640 64 576 64
WIRE 864 64 640 64
WIRE 112 80 112 64
WIRE 864 96 864 64
WIRE 208 128 208 64
WIRE 240 128 208 128
WIRE 640 128 528 128
WIRE 672 128 640 128
WIRE 752 128 736 128
WIRE 112 176 112 160
WIRE 240 176 224 176
WIRE 816 176 528 176
WIRE 240 224 224 224
WIRE 752 224 752 128
WIRE 752 224 528 224
WIRE 864 224 864 192
WIRE 864 224 752 224
WIRE 1008 224 912 224
WIRE 1120 224 1072 224
WIRE 1184 224 1120 224
WIRE 1296 224 1264 224
WIRE 1328 224 1296 224
WIRE 1440 224 1328 224
WIRE 864 240 864 224
WIRE 912 240 912 224
WIRE 1328 240 1328 224
WIRE 1440 240 1440 224
WIRE 1120 256 1120 224
WIRE 240 272 224 272
WIRE 128 320 96 320
WIRE 240 320 208 320
WIRE 864 336 864 320
WIRE 912 336 912 320
WIRE 1120 336 1120 320
WIRE 1328 336 1328 304
WIRE 1440 336 1440 320
WIRE 0 368 -32 368
WIRE 96 368 96 320
WIRE 96 368 64 368
WIRE 240 368 96 368
WIRE 720 368 528 368
WIRE 544 416 528 416
WIRE 720 416 720 368
WIRE 816 416 720 416
WIRE 144 464 128 464
WIRE 240 464 208 464
WIRE 576 464 576 64
WIRE 576 464 528 464
WIRE 864 464 864 432
WIRE 864 464 800 464
WIRE 864 480 864 464
WIRE 1296 496 1296 224
WIRE -64 512 -80 512
WIRE 32 512 16 512
WIRE 240 512 32 512
WIRE 544 512 528 512
WIRE 32 560 32 512
WIRE 48 560 32 560
WIRE 160 560 128 560
WIRE 240 560 224 560
WIRE 800 560 800 464
WIRE 800 560 528 560
WIRE 864 576 864 560
WIRE 32 624 32 560
WIRE 1296 624 1296 576
WIRE 1296 624 32 624
FLAG 544 416 0
FLAG 864 576 0
FLAG 224 272 0
FLAG 224 176 0
FLAG 128 464 0
FLAG -32 368 0
FLAG 112 176 0
FLAG 1328 336 0
FLAG -80 512 0
FLAG 1440 336 0
FLAG 912 336 0
FLAG 1120 336 0
FLAG 1440 224 OUT
FLAG 224 224 0
FLAG 112 64 IN
SYMBOL nmos 816 96 R0
WINDOW 0 -2 23 Right 2
WINDOW 3 40 102 Right 2
SYMATTR InstName Q1
SYMATTR Value IRF7303
SYMBOL nmos 816 336 R0
WINDOW 0 -1 24 Right 2
WINDOW 3 42 103 Right 2
SYMATTR InstName Q2
SYMATTR Value IRF7303
SYMBOL voltage 112 64 R0
SYMATTR InstName V1
SYMATTR Value 16
SYMBOL res 848 464 R0
SYMATTR InstName R1
SYMATTR Value 25m
SYMBOL cap 208 448 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value .001µ
SYMBOL cap 224 544 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value .001µ
SYMBOL res 144 544 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 100
SYMBOL res 32 496 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 1K
SYMBOL res 1280 592 M180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R4
SYMATTR Value 1K
SYMBOL cap 64 352 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value 150p
SYMBOL res 224 304 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 52.3K
SYMBOL ind2 848 224 R0
WINDOW 0 -4 31 Right 2
WINDOW 3 -6 71 Right 2
SYMATTR InstName L1
SYMATTR Value 300µ
SYMATTR Type ind
SYMBOL ind2 928 224 M0
WINDOW 0 3 35 Right 2
WINDOW 3 1 71 Right 2
SYMATTR InstName L2
SYMATTR Value 300µ
SYMATTR Type ind
SYMBOL schottky 1104 320 M180
WINDOW 0 24 72 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value MBRS360
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL ind 1168 240 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L3
SYMATTR Value 10µ
SYMBOL cap 1312 240 R0
SYMATTR InstName C4
SYMATTR Value 100µ
SYMATTR SpiceLine Rser=50m
SYMBOL cap 736 112 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C5
SYMATTR Value .5µ
SYMBOL diode 656 64 M0
WINDOW 0 15 -6 Bottom 2
WINDOW 3 19 70 Top 2
SYMATTR InstName D2
SYMATTR Value 1N5817
SYMBOL schottky 1008 240 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D3
SYMATTR Value MBRS360
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL PowerProducts\\LT3781 384 336 R0
SYMATTR InstName U1
SYMBOL res 1424 336 M180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName Rload
SYMATTR Value 5
TEXT 864 40 Bottom 2 !K1 L1 L2 1.
TEXT 992 672 Left 2 !.tran .5m startup