* SPICE netlist
XU1 N004 N007 N001 N006 IN N002 MP_01 MP_02 N002 MP_03 MP_04 MP_05 N005 N008 N009 MP_06 0 LT3581 ;pnba FB)Vc)Gate)_Fault)Vin)SW1)))SW2))))_SHDN)Rt)SS))GND
V1 IN 0 5
L1 IN N002 1.5 Rser=1.5m
D1 N002 N003 1N5818
C1 N003 0 4.7 Rser=5m
R1 N003 N004 130K
R2 N003 N001 130K
MQ1 OUT N001 N003 N003 Si4427DY
R3 N008 0 43.2K
C2 N009 0 .02
R4 IN N006 100K
R5 N005 0 10K
R6 IN N005 18.7K
C3 N007 0 1000p Rser=10.5K Cpar=56p
C4 OUT 0 4.7 Rser=5m
D2 IN N001 MBR0520L
Rload OUT 0 14
.tran 2m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1184 592
WIRE 64 -296 -400 -296
WIRE 208 -296 128 -296
WIRE -496 -232 -592 -232
WIRE -400 -232 -400 -296
WIRE -400 -232 -496 -232
WIRE -320 -232 -400 -232
WIRE -208 -232 -240 -232
WIRE -112 -232 -208 -232
WIRE -80 -232 -112 -232
WIRE 32 -232 -16 -232
WIRE 112 -232 32 -232
WIRE 240 -232 112 -232
WIRE 336 -232 240 -232
WIRE 480 -232 432 -232
WIRE 592 -232 480 -232
WIRE -592 -216 -592 -232
WIRE 32 -216 32 -232
WIRE 112 -216 112 -232
WIRE 240 -216 240 -232
WIRE 480 -216 480 -232
WIRE 592 -216 592 -232
WIRE -208 -168 -208 -232
WIRE -112 -168 -112 -232
WIRE 32 -136 32 -152
WIRE -592 -120 -592 -136
WIRE 480 -120 480 -152
WIRE 592 -120 592 -136
WIRE -496 -104 -496 -232
WIRE -400 -104 -400 -232
WIRE -304 -104 -400 -104
WIRE 112 -104 112 -136
WIRE 112 -104 -16 -104
WIRE 240 -104 240 -136
WIRE 352 -104 352 -184
WIRE 352 -104 240 -104
WIRE -496 -8 -496 -24
WIRE -304 -8 -496 -8
WIRE 208 -8 208 -296
WIRE 208 -8 -16 -8
WIRE 352 -8 352 -104
WIRE 352 -8 208 -8
WIRE -496 8 -496 -8
WIRE -400 8 -400 -104
WIRE -304 88 -400 88
WIRE 112 88 -16 88
WIRE 208 88 176 88
WIRE -496 104 -496 88
WIRE -304 184 -384 184
WIRE 32 184 -16 184
WIRE -384 200 -384 184
WIRE 32 200 32 184
WIRE -160 264 -160 248
WIRE -384 296 -384 280
WIRE 32 296 32 264
FLAG 32 -136 0
FLAG -592 -120 0
FLAG -592 -232 IN
FLAG -160 264 0
FLAG -384 296 0
FLAG 32 296 0
FLAG -496 104 0
FLAG 208 88 0
FLAG 480 -120 0
FLAG 592 -120 0
FLAG 592 -232 OUT
SYMBOL PowerProducts\\LT3581 -160 40 R0
SYMATTR InstName U1
SYMBOL voltage -592 -232 R0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL ind -336 -216 R270
SYMATTR InstName L1
SYMATTR Value 1.5
SYMATTR SpiceLine Rser=1.5m
SYMBOL schottky -80 -216 R270
SYMATTR InstName D1
SYMATTR Value 1N5818
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 16 -216 R0
SYMATTR InstName C1
SYMATTR Value 4.7
SYMATTR SpiceLine Rser=5m
SYMBOL res 96 -232 R0
SYMATTR InstName R1
SYMATTR Value 130K
SYMBOL res 224 -232 R0
SYMATTR InstName R2
SYMATTR Value 130K
SYMBOL pmos 432 -184 M270
SYMATTR InstName Q1
SYMATTR Value Si4427DY
SYMBOL res -400 184 R0
SYMATTR InstName R3
SYMATTR Value 43.2K
SYMBOL cap 16 200 R0
SYMATTR InstName C2
SYMATTR Value .02
SYMBOL res -416 -8 R0
SYMATTR InstName R4
SYMATTR Value 100K
SYMBOL res -512 -8 R0
SYMATTR InstName R5
SYMATTR Value 10K
SYMBOL res -512 -120 R0
SYMATTR InstName R6
SYMATTR Value 18.7K
SYMBOL cap 112 104 R270
SYMATTR InstName C3
SYMATTR Value 1000p
SYMATTR SpiceLine Rser=10.5K Cpar=56p
SYMBOL cap 464 -216 R0
SYMATTR InstName C4
SYMATTR Value 4.7
SYMATTR SpiceLine Rser=5m
SYMBOL schottky 64 -280 R270
SYMATTR InstName D2
SYMATTR Value MBR0520L
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 576 -232 R0
SYMATTR InstName Rload
SYMATTR Value 14