* SPICE netlist
R4 N014 N012 52.3K
R5 N015 0 5m
MQ1 N010 N013 N015 N015 Si4470DY
C1 N008 N009 .0047
R6 N008 N007 47K tol=1 pwr=0.1
L1 IN N010 400 Rser=1 Rpar=2K
L2 N001 0 100 Rser=.2
L3 N002 OUT 2 Rpar=1K
C2 OUT 0 50
R7 OUT N007 43.7K
R8 N007 0 4.99K
R9 N006 N003 500K
R10 0 N006 {50K*2}
C3 N012 0 {.01u/1000}
R11 N015 N017 500
Rload OUT 0 7
R12 0 N016 100K
R13 N011 0 365K
R14 N005 0 30.9
V1 IN 0 54
D3 0 N004 BZX84C15L
R1 IN N004 100K
R2 IN N003 100K
C4 N003 0 10
Q2 IN N004 N003 0 2N3019
C5 0 IN 22
D1 0 N002 1N5817
D2 N001 N002 1N5817
XU1 0 NC_01 N005 0 N006 NC_02 0 NC_03 N009 N007 N011 IN N012 N014 N006 0 0 N017 N015 N016 0 N013 N003 LTC4269-2 ;pnba SHDN)_T2PSE)Rclass)VPORTN)PWRGD)_PWRGD)Vneg)Sout)Comp)FB)Rosc)VPORTP)SS_MaxDC)Vref)SD_Vsec)GND)Blank)Isense)OC)Delay)PGND)Out)Vin
K1 L1 L2 1
.tran 4m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1696 944
WIRE -224 -472 -784 -472
WIRE 0 -472 -224 -472
WIRE 96 -472 0 -472
WIRE 192 -472 96 -472
WIRE 352 -472 192 -472
WIRE 464 -472 400 -472
WIRE 560 -472 528 -472
WIRE 592 -472 560 -472
WIRE 704 -472 672 -472
WIRE 784 -472 704 -472
WIRE 848 -472 784 -472
WIRE -784 -456 -784 -472
WIRE 0 -456 0 -472
WIRE 352 -456 352 -472
WIRE 400 -456 400 -472
WIRE 704 -456 704 -472
WIRE 848 -456 848 -472
WIRE 192 -440 192 -472
WIRE 560 -440 560 -472
WIRE -592 -408 -608 -408
WIRE -224 -408 -224 -472
WIRE -224 -408 -272 -408
WIRE -224 -392 -224 -408
WIRE 96 -392 96 -472
WIRE -784 -360 -784 -376
WIRE 0 -360 0 -376
WIRE 0 -360 -144 -360
WIRE 400 -360 400 -376
WIRE 560 -360 560 -376
WIRE 704 -360 704 -392
WIRE 848 -360 848 -376
WIRE 192 -344 192 -360
WIRE 192 -344 160 -344
WIRE -224 -312 -224 -328
WIRE 192 -312 192 -344
WIRE 0 -296 0 -360
WIRE 96 -296 0 -296
WIRE -688 -280 -704 -280
WIRE -592 -280 -608 -280
WIRE -240 -280 -272 -280
WIRE -144 -280 -240 -280
WIRE 192 -232 192 -248
WIRE -592 -216 -608 -216
WIRE -240 -216 -240 -280
WIRE -240 -216 -272 -216
WIRE -784 -152 -848 -152
WIRE -688 -152 -704 -152
WIRE -592 -152 -624 -152
WIRE -256 -152 -272 -152
WIRE -848 -88 -848 -152
WIRE -592 -88 -848 -88
WIRE 0 -88 0 -296
WIRE 0 -88 -272 -88
WIRE 0 -72 0 -88
WIRE 352 -40 352 -376
WIRE -688 -24 -704 -24
WIRE -592 -24 -608 -24
WIRE 0 8 0 -8
WIRE -592 40 -704 40
WIRE 304 40 -272 40
WIRE -784 104 -800 104
WIRE -704 104 -704 40
WIRE -704 104 -736 104
WIRE -688 104 -704 104
WIRE -592 104 -608 104
WIRE -256 104 -272 104
WIRE -592 168 -608 168
WIRE -160 168 -272 168
WIRE 352 168 352 56
WIRE 352 168 -160 168
WIRE 352 184 352 168
WIRE -688 232 -704 232
WIRE -592 232 -608 232
WIRE -256 232 -272 232
WIRE -160 232 -160 168
WIRE -160 232 -176 232
WIRE 784 248 784 -472
WIRE 352 280 352 264
WIRE -432 296 -432 280
WIRE -848 360 -848 -88
WIRE 784 360 784 328
WIRE 784 360 -848 360
WIRE 784 376 784 360
WIRE 784 472 784 456
FLAG 848 -472 OUT
FLAG -784 -360 0
FLAG -784 -472 IN
FLAG -704 -24 0
FLAG -608 168 0
FLAG -432 296 0
FLAG -256 -152 0
FLAG -704 232 0
FLAG 352 280 0
FLAG -256 104 0
FLAG 784 472 0
FLAG 848 -360 0
FLAG 704 -360 0
FLAG 560 -360 0
FLAG 400 -360 0
FLAG 192 -232 0
FLAG -608 -216 0
FLAG -608 -408 0
FLAG -704 -280 0
FLAG -224 -312 0
FLAG -800 104 0
FLAG -144 -200 0
FLAG 0 8 0
SYMBOL res -592 120 M270
SYMATTR InstName R4
SYMATTR Value 52.3K
SYMBOL res 336 168 R0
SYMATTR InstName R5
SYMATTR Value 5m
SYMBOL nmos 304 -40 R0
SYMATTR InstName Q1
SYMATTR Value Si4470DY
SYMBOL cap -688 -168 M90
SYMATTR InstName C1
SYMATTR Value .0047
SYMBOL res -688 -168 R90
SYMATTR InstName R6
SYMATTR Value 47K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL ind2 336 -472 R0
SYMATTR InstName L1
SYMATTR Value 400
SYMATTR Type ind
SYMATTR SpiceLine Rser=1 Rpar=2K
SYMBOL ind2 416 -472 M0
SYMATTR InstName L2
SYMATTR Value 100
SYMATTR Type ind
SYMATTR SpiceLine Rser=.2
SYMBOL ind 576 -456 R270
SYMATTR InstName L3
SYMATTR Value 2
SYMATTR SpiceLine Rpar=1K
SYMBOL cap 688 -456 R0
SYMATTR InstName C2
SYMATTR Value 50
SYMBOL res 768 232 R0
SYMATTR InstName R7
SYMATTR Value 43.7K
SYMBOL res 768 360 R0
SYMATTR InstName R8
SYMATTR Value 4.99K
SYMBOL res -160 -264 M180
SYMATTR InstName R9
SYMATTR Value 500K
SYMBOL res -160 -184 M180
SYMATTR InstName R10
SYMATTR Value {50K*2}
SYMBOL cap -736 88 R90
SYMATTR InstName C3
SYMATTR Value {.01u/1000}
SYMBOL res -160 248 M270
SYMATTR InstName R11
SYMATTR Value 500
SYMBOL res 832 -472 R0
SYMATTR InstName Rload
SYMATTR Value 7
SYMBOL res -704 248 R270
SYMATTR InstName R12
SYMATTR Value 100K
SYMBOL res -592 -40 R90
SYMATTR InstName R13
SYMATTR Value 365K
SYMBOL res -592 -264 M270
SYMATTR InstName R14
SYMATTR Value 30.9
SYMBOL voltage -784 -472 R0
SYMATTR InstName V1
SYMATTR Value 54
SYMBOL zener 176 -248 M180
SYMATTR InstName D3
SYMATTR Value BZX84C15L
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 176 -456 R0
SYMATTR InstName R1
SYMATTR Value 100K
SYMBOL res -16 -472 R0
SYMATTR InstName R2
SYMATTR Value 100K
SYMBOL cap -16 -72 R0
SYMATTR InstName C4
SYMATTR Value 10
SYMBOL npn 160 -392 M0
SYMATTR InstName Q2
SYMATTR Value 2N3019
SYMBOL cap -240 -328 M180
SYMATTR InstName C5
SYMATTR Value 22
SYMBOL schottky 544 -376 M180
SYMATTR InstName D1
SYMATTR Value 1N5817
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL schottky 464 -456 R270
SYMATTR InstName D2
SYMATTR Value 1N5817
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL LTC4269-2 -432 -88 R0
SYMATTR InstName U1