* SPICE netlist
R1 N007 0 10K
R2 N006 0 28.7K
V1 IN 0 18
C1 N010 N009 .001
C2 0 N011 4.7
R3 N003 N005 80.6K
R4 0 N008 6.04K
L1 IN N003 24 Rpar=5K
L2 0 N001 2.6 Rpar=5K
C3 OUT 0 22
D1 N001 OUT MBRS340
R5 N009 0 59K
C4 0 N012 .01
R6 IN N004 357K
R7 N004 0 51.1K
R8 IN N002 2K
C5 IN N002 .22
D2 N003 N002 1N4148
Rload OUT 0 20
XU1 0 MP_01 MP_02 N003 IN N011 N004 MP_03 MP_04 N012 N007 N010 N005 N008 N006 LT3574 ;pnba GND)))SW)Vin)Bias)_SHDN/UVLO)))SS)Rlim)Vc)Rfb)Rref)TC
K1 L1 L2 1.
.tran 2.5m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1024 608
WIRE -352 -304 -464 -304
WIRE -160 -304 -352 -304
WIRE -112 -304 -160 -304
WIRE -32 -304 -112 -304
WIRE 144 -304 -32 -304
WIRE 272 -304 192 -304
WIRE 400 -304 336 -304
WIRE 512 -304 400 -304
WIRE -464 -288 -464 -304
WIRE -112 -288 -112 -304
WIRE -32 -288 -32 -304
WIRE 144 -288 144 -304
WIRE 192 -288 192 -304
WIRE 512 -288 512 -304
WIRE -352 -272 -352 -304
WIRE 400 -272 400 -304
WIRE -464 -192 -464 -208
WIRE -112 -192 -112 -224
WIRE -32 -192 -32 -208
WIRE -32 -192 -112 -192
WIRE 32 -192 -32 -192
WIRE 144 -192 144 -208
WIRE 144 -192 96 -192
WIRE 192 -192 192 -208
WIRE 400 -192 400 -208
WIRE 512 -192 512 -208
WIRE -160 -160 -160 -304
WIRE -464 -96 -512 -96
WIRE -352 -96 -352 -192
WIRE -352 -96 -384 -96
WIRE -320 -96 -352 -96
WIRE 32 -96 0 -96
WIRE 144 -96 144 -192
WIRE 144 -96 112 -96
WIRE -416 -16 -512 -16
WIRE -320 -16 -336 -16
WIRE 144 -16 144 -96
WIRE 144 -16 0 -16
WIRE -464 64 -512 64
WIRE -320 64 -384 64
WIRE 16 64 0 64
WIRE 112 64 96 64
WIRE -496 144 -512 144
WIRE -400 144 -416 144
WIRE -320 144 -336 144
WIRE 16 144 0 144
WIRE 112 144 80 144
WIRE -224 224 -224 208
WIRE -96 224 -96 208
WIRE -224 304 -224 288
FLAG -96 224 0
FLAG -224 304 0
FLAG -512 144 0
FLAG -512 -16 0
FLAG -512 64 0
FLAG -464 -192 0
FLAG 112 144 0
FLAG 112 64 0
FLAG 400 -192 0
FLAG 192 -192 0
FLAG 512 -192 0
FLAG -464 -304 IN
FLAG 512 -304 OUT
FLAG -512 -96 0
SYMBOL res -368 48 R90
SYMATTR InstName R1
SYMATTR Value 10K
SYMBOL res -320 -32 R90
SYMATTR InstName R2
SYMATTR Value 28.7K
SYMBOL voltage -464 -304 R0
SYMATTR InstName V1
SYMATTR Value 18
SYMBOL cap -336 128 R90
SYMATTR InstName C1
SYMATTR Value .001
SYMBOL cap 80 128 R90
SYMATTR InstName C2
SYMATTR Value 4.7
SYMBOL res 128 -112 R90
SYMATTR InstName R3
SYMATTR Value 80.6K
SYMBOL res 112 48 R90
SYMATTR InstName R4
SYMATTR Value 6.04K
SYMBOL ind2 128 -304 R0
SYMATTR InstName L1
SYMATTR Value 24
SYMATTR Type ind
SYMATTR SpiceLine Rpar=5K
SYMBOL ind2 208 -192 R180
SYMATTR InstName L2
SYMATTR Value 2.6
SYMATTR Type ind
SYMATTR SpiceLine Rpar=5K
SYMBOL cap 384 -272 R0
SYMATTR InstName C3
SYMATTR Value 22
SYMBOL schottky 272 -288 R270
SYMATTR InstName D1
SYMATTR Value MBRS340
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res -400 128 R90
SYMATTR InstName R5
SYMATTR Value 59K
SYMBOL cap -240 288 M180
SYMATTR InstName C4
SYMATTR Value .01
SYMBOL res -368 -288 R0
SYMATTR InstName R6
SYMATTR Value 357K
SYMBOL res -368 -112 R90
SYMATTR InstName R7
SYMATTR Value 51.1K
SYMBOL res -48 -304 R0
SYMATTR InstName R8
SYMATTR Value 2K
SYMBOL cap -128 -288 R0
SYMATTR InstName C5
SYMATTR Value .22
SYMBOL diode 96 -176 M270
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL res 496 -304 R0
SYMATTR InstName Rload
SYMATTR Value 20
SYMBOL PowerProducts\\LT3574 -160 16 R0
SYMATTR InstName U1