* SPICE netlist
V1 IN 0 5
L1 IN N002 2.2 Rser=1.5m
D1 N002 N003 1N5818
C1 N003 0 10 Rser=5m
R1 N003 N004 130K
R2 N003 N001 6.3K
MQ1 OUT N001 N003 N003 Si4427DY
R3 N008 0 86.6K
C2 N009 0 .02
R4 IN N006 100K
R5 N005 0 10K
R6 IN N005 18.7K
C3 N007 0 2200p Rser=8K Cpar=47p
C4 OUT 0 10 Rser=5m
D2 IN N001 MBR0520L
Rload OUT 0 7
XU1 N004 N007 N001 N006 IN N002 MP_01 MP_02 N002 MP_03 MP_04 MP_05 N005 N008 N009 MP_06 0 LT3579 ;pnba FB)Vc)Gate)_Fault)Vin)SW1)))SW2))))_SHDN)Rt)SS))GND
.tran 2m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1200 592
WIRE 88 -296 -376 -296
WIRE 312 -296 152 -296
WIRE -504 -232 -600 -232
WIRE -376 -232 -376 -296
WIRE -376 -232 -504 -232
WIRE -328 -232 -376 -232
WIRE -200 -232 -248 -232
WIRE -104 -232 -200 -232
WIRE -72 -232 -104 -232
WIRE 40 -232 -8 -232
WIRE 120 -232 40 -232
WIRE 216 -232 120 -232
WIRE 344 -232 216 -232
WIRE 504 -232 440 -232
WIRE 600 -232 504 -232
WIRE -600 -216 -600 -232
WIRE 40 -216 40 -232
WIRE 120 -216 120 -232
WIRE 216 -216 216 -232
WIRE 504 -216 504 -232
WIRE 600 -216 600 -232
WIRE -200 -168 -200 -232
WIRE -104 -168 -104 -232
WIRE 40 -136 40 -152
WIRE -600 -120 -600 -136
WIRE 504 -120 504 -152
WIRE 600 -120 600 -136
WIRE -504 -104 -504 -232
WIRE -376 -104 -376 -232
WIRE -296 -104 -376 -104
WIRE 120 -104 120 -136
WIRE 120 -104 -8 -104
WIRE 216 -88 216 -136
WIRE 312 -88 312 -296
WIRE 312 -88 216 -88
WIRE -504 -8 -504 -24
WIRE -296 -8 -504 -8
WIRE 312 -8 312 -88
WIRE 312 -8 -8 -8
WIRE 360 -8 360 -184
WIRE 360 -8 312 -8
WIRE -504 8 -504 -8
WIRE -376 8 -376 -104
WIRE -296 88 -376 88
WIRE 88 88 -8 88
WIRE 184 88 152 88
WIRE -504 104 -504 88
WIRE -296 184 -376 184
WIRE 40 184 -8 184
WIRE -376 200 -376 184
WIRE 40 200 40 184
WIRE -152 264 -152 248
WIRE -376 296 -376 280
WIRE 40 296 40 264
FLAG 40 -136 0
FLAG -600 -120 0
FLAG -600 -232 IN
FLAG -152 264 0
FLAG -376 296 0
FLAG 40 296 0
FLAG -504 104 0
FLAG 184 88 0
FLAG 504 -120 0
FLAG 600 -120 0
FLAG 600 -232 OUT
SYMBOL voltage -600 -232 R0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL ind -344 -216 R270
SYMATTR InstName L1
SYMATTR Value 2.2
SYMATTR SpiceLine Rser=1.5m
SYMBOL schottky -72 -216 R270
SYMATTR InstName D1
SYMATTR Value 1N5818
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 24 -216 R0
SYMATTR InstName C1
SYMATTR Value 10
SYMATTR SpiceLine Rser=5m
SYMBOL res 104 -232 R0
SYMATTR InstName R1
SYMATTR Value 130K
SYMBOL res 200 -232 R0
SYMATTR Value 6.3K
SYMATTR InstName R2
SYMBOL pmos 440 -184 M270
SYMATTR InstName Q1
SYMATTR Value Si4427DY
SYMBOL res -392 184 R0
SYMATTR InstName R3
SYMATTR Value 86.6K
SYMBOL cap 24 200 R0
SYMATTR InstName C2
SYMATTR Value .02
SYMBOL res -392 -8 R0
SYMATTR InstName R4
SYMATTR Value 100K
SYMBOL res -520 -8 R0
SYMATTR InstName R5
SYMATTR Value 10K
SYMBOL res -520 -120 R0
SYMATTR InstName R6
SYMATTR Value 18.7K
SYMBOL cap 88 104 R270
SYMATTR InstName C3
SYMATTR Value 2200p
SYMATTR SpiceLine Rser=8K Cpar=47p
SYMBOL cap 488 -216 R0
SYMATTR InstName C4
SYMATTR Value 10
SYMATTR SpiceLine Rser=5m
SYMBOL schottky 88 -280 R270
SYMATTR InstName D2
SYMATTR Value MBR0520L
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 584 -232 R0
SYMATTR InstName Rload
SYMATTR Value 7
SYMBOL PowerProducts\\LT3579-1 -152 40 R0
SYMATTR InstName U1