Version 4
SHEET 1 880 680
WIRE -48 48 -192 48
WIRE 0 48 -48 48
WIRE 112 48 64 48
WIRE 176 48 112 48
WIRE 272 48 240 48
WIRE -192 64 -192 48
WIRE 496 80 336 80
WIRE 336 96 336 80
WIRE 496 96 496 80
WIRE 112 112 112 48
WIRE -192 160 -192 144
WIRE -48 176 -48 48
WIRE -16 176 -48 176
WIRE 288 176 240 176
WIRE 496 192 496 176
WIRE -16 256 -192 256
WIRE 272 256 272 48
WIRE 272 256 240 256
WIRE 336 256 336 192
WIRE 336 256 272 256
WIRE 384 256 336 256
WIRE 496 256 464 256
WIRE 576 256 496 256
WIRE 496 272 496 256
WIRE 576 272 576 256
WIRE -16 336 -96 336
WIRE 288 336 240 336
WIRE -96 368 -96 336
WIRE 336 368 336 352
WIRE 496 368 496 336
WIRE 576 368 576 352
WIRE 112 416 112 400
WIRE -192 448 -192 256
WIRE -96 464 -96 448
WIRE -192 544 -192 528
FLAG 112 416 0
FLAG -96 464 0
FLAG -192 160 0
FLAG 336 368 0
FLAG 496 192 0
FLAG 496 368 0
FLAG 576 368 0
FLAG -192 544 0
SYMBOL voltage -192 48 R0
SYMATTR InstName V1
SYMATTR Value 10
SYMBOL voltage -96 352 R0
SYMATTR InstName V2
SYMATTR Value PULSE(0 5 0 10n 10n 1u 2u)
SYMBOL nmos 288 96 R0
SYMATTR InstName Q1
SYMATTR Value IRF7468
SYMBOL nmos 288 256 R0
SYMATTR InstName Q2
SYMATTR Value IRF7468
SYMBOL cap 240 32 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value .1µ
SYMBOL schottky 0 64 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value 1N5819
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL voltage 496 80 R0
SYMATTR InstName V3
SYMATTR Value 50
SYMBOL ind 368 272 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value 1µ
SYMBOL cap 480 272 R0
SYMATTR InstName C2
SYMATTR Value 10µ
SYMBOL res 560 256 R0
SYMATTR InstName R1
SYMATTR Value .5
SYMBOL PowerProducts\\LTC4444 112 256 R0
SYMATTR InstName U1
SYMBOL voltage -192 432 R0
SYMATTR InstName V4
SYMATTR Value PULSE(5 0 0 10n 10n 1u 2u)
TEXT 392 440 Left 2 !.tran 100u startup