* SPICE netlist
R1 N006 0 110K
V1 IN 0 12
C2 INTVCC 0 1
L1 N002 OUT 120 Rser=.2
C3 N001 N002 47n
C4 N005 0 22 Rser=10m
R2 N003 FB 1.62Meg
R3 FB 0 301K
XU1 INTVCC N002 OUT N001 N006 FB TRSS N007 IN IN 0 LT8604C LT8604=0 DFN=1 VOUT33=0 ;pnba INTVCC)SW)Bias)BST)Rt)FB)TR/SS)PG)EN/UV)Vin)GND
R4 OUT N007 100K
@1 OUT N003 delay=7.5m fstart=800 fend=100k oct=2 fcoarse=2k nmax=4 pp0=40m pp1=10m f0=781.25 f1=3.125K tavgmin=250 tsettle=125 enabled=0
R5 N004 N005 5m
L2 OUT N004 1n
C1 OUT 0 100p
@z1 OUT 0 zm delay=1m fstart=800 fend=10Meg oct=2 fcoarse=2k nmax=4 pp0=40m pp1=10m f0=781.25 f1=3.125K tavgmin=100 tsettle=125
I1 OUT 0 PULSE(0 50m 300u 100u 100u 1)
.ic V(OUT)=4.95 V(TRSS)=3.5 V(INTVCC)=3.5
.fra

* LTspice schematic (.asc)
Version 4
SHEET 1 1120 544
WIRE -432 -272 -560 -272
WIRE -416 -272 -432 -272
WIRE -96 -272 -128 -272
WIRE -560 -256 -560 -272
WIRE -96 -256 -96 -272
WIRE -432 -176 -432 -272
WIRE -416 -176 -432 -176
WIRE -96 -176 -96 -192
WIRE -96 -176 -128 -176
WIRE -32 -176 -96 -176
WIRE 80 -176 48 -176
WIRE 128 -176 80 -176
WIRE 256 -176 128 -176
WIRE 320 -176 256 -176
WIRE 368 -176 320 -176
WIRE 464 -176 368 -176
WIRE 560 -176 464 -176
WIRE -560 -160 -560 -176
WIRE 128 -160 128 -176
WIRE 256 -160 256 -176
WIRE 368 -160 368 -176
WIRE -464 -80 -496 -80
WIRE -416 -80 -464 -80
WIRE 80 -80 80 -176
WIRE 80 -80 -128 -80
WIRE 128 -80 128 -96
WIRE 256 -80 256 -96
WIRE 368 -64 368 -80
WIRE -64 16 -128 16
WIRE 128 16 128 0
WIRE 128 16 -64 16
WIRE 560 16 560 -176
WIRE 368 32 368 16
WIRE 464 32 464 -176
WIRE 128 48 128 16
WIRE -448 112 -480 112
WIRE -416 112 -448 112
WIRE 368 112 368 96
WIRE 464 112 464 96
WIRE 560 112 560 96
WIRE 128 144 128 128
WIRE -512 208 -528 208
WIRE -416 208 -432 208
WIRE -64 208 -128 208
WIRE 80 208 80 -80
WIRE 80 208 16 208
WIRE -272 272 -272 256
FLAG -272 272 0
FLAG -528 208 0
FLAG -560 -160 0
FLAG -560 -80 0
FLAG 368 112 0
FLAG 128 144 0
FLAG 560 112 0
FLAG 320 -176 OUT
FLAG -560 -272 IN
FLAG -64 16 FB
FLAG 464 112 0
FLAG 256 -80 0
FLAG -448 112 TRSS
FLAG -464 -80 INTVCC
SYMBOL res -416 192 R90
SYMATTR InstName R1
SYMATTR Value 110K
SYMBOL voltage -560 -272 R0
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL cap -496 -64 M270
SYMATTR InstName C2
SYMATTR Value 1
SYMBOL ind -48 -160 R270
SYMATTR InstName L1
SYMATTR Value 120
SYMATTR SpiceLine Rser=.2
SYMBOL cap -112 -256 R0
SYMATTR InstName C3
SYMATTR Value 47n
SYMBOL cap 352 32 R0
SYMATTR InstName C4
SYMATTR Value 22
SYMATTR SpiceLine Rser=10m
SYMBOL res 112 -96 R0
SYMATTR InstName R2
SYMATTR Value 1.62Meg
SYMBOL res 112 32 R0
SYMATTR InstName R3
SYMATTR Value 301K
SYMBOL LT8618 -272 -80 R0
SYMATTR InstName U1
SYMBOL res 32 192 R90
SYMATTR InstName R4
SYMATTR Value 100K
SYMBOL fra 128 -96 R0
SYMATTR InstName @1
SYMATTR SpiceLine delay=7.5m fstart=800 fend=100k oct=2 fcoarse=2k nmax=4 pp0=40m pp1=10m f0=781.25 f1=3.125K tavgmin=250 tsettle=125 enabled=0
SYMBOL res 352 -80 R0
SYMATTR InstName R5
SYMATTR Value 5m
SYMBOL ind 352 -176 R0
SYMATTR InstName L2
SYMATTR Value 1n
SYMBOL cap 448 32 R0
SYMATTR InstName C1
SYMATTR Value 100p
SYMBOL fra 256 -96 R0
SYMATTR InstName @z1
SYMATTR SpiceLine zm delay=1m fstart=800 fend=10Meg oct=2 fcoarse=2k nmax=4 pp0=40m pp1=10m f0=781.25 f1=3.125K tavgmin=100 tsettle=125
SYMBOL current 560 16 R0
SYMATTR InstName I1
SYMATTR Value PULSE(0 50m 300u 100u 100u 1)