Version 4
SHEET 1 880 680
WIRE 288 -48 240 -48
WIRE 400 -48 352 -48
WIRE 240 16 240 -48
WIRE 80 64 -16 64
WIRE 112 64 80 64
WIRE 400 64 400 -48
WIRE 400 64 368 64
WIRE 496 64 400 64
WIRE 592 64 560 64
WIRE -16 80 -16 64
WIRE 400 80 400 64
WIRE -16 176 -16 160
WIRE 80 176 80 64
WIRE 112 176 80 176
WIRE 400 176 400 160
WIRE 400 176 368 176
WIRE 400 272 368 272
WIRE 464 272 400 272
WIRE 560 272 464 272
WIRE 464 288 464 272
WIRE 560 288 560 272
WIRE 16 384 0 384
WIRE 112 384 96 384
WIRE 400 384 400 272
WIRE 400 384 368 384
WIRE 464 384 464 352
WIRE 560 384 560 368
WIRE 240 448 240 432
FLAG 240 448 0
FLAG 592 64 0
FLAG 464 384 0
FLAG -16 176 0
FLAG 0 384 0
FLAG 560 384 0
FLAG -16 64 IN
FLAG 560 272 OUT
SYMBOL ind 384 64 R0
SYMATTR InstName L1
SYMATTR Value 6.8µ
SYMBOL schottky 560 48 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName D1
SYMATTR Value MBRS140
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 352 -64 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value .1µ
SYMBOL cap 448 288 R0
SYMATTR InstName C2
SYMATTR Value 22µ
SYMBOL voltage -16 64 R0
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL res 112 368 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 28.7K
SYMBOL res 544 272 R0
SYMATTR InstName R4
SYMATTR Value 5
SYMBOL PowerProducts\\LT3663-3.3 240 224 R0
SYMATTR InstName U1
TEXT 464 448 Left 2 !.tran 500u startup