* Z:\home\khalils\Downloads\files\data\raw_asc\LT3999.asc
* Generated by LTspice 26.0.1 for Windows.
* Library below included based on ModelFile attribute of instance XU1 (C:\users\khalils\AppData\Local\LTspice\lib\sym\PowerProducts\LT3999.asy)
K1 L1 L2 L3 L4 1
R1 IN N004 255K
R2 N004 0 10K
L2 IN N006 82.5 Rser=50m
R5 N008 0 15.8K
V1 IN 0 12
Rout OUT 0 30
L1 N001 IN 82.5 Rser=50m
R3 N005 0 28K
XU1 N001 N010 IN IN N004 N008 N005 0 N009 N006 0 LT3999 ;pnba SWA)Rbias)Vin)UVLO)OVLO/DC)Rdc)Rt)SYNC)Ilim/SS)SWB)GND
R4 N010 0 49.9K
D2 N007 N003 MBRS1100
C2 OUT 0 10 Rser=10m
C1 N009 0 .01
L5 N003 OUT 15.3 Rser=20m
L4 0 N007 165 Rser=72m
L3 N002 0 165 Rser=72m
D1 N002 N003 MBRS1100
.model D D
.lib C:\users\khalils\AppData\Local\LTspice\lib\cmp\standard.dio
.tran 1.5m startup
.lib LT3999.sub
.backanno
.end

* LTspice schematic (.asc):
Version 4
SHEET 1 1224 680
WIRE -64 -112 -160 -112
WIRE 224 -112 -64 -112
WIRE 384 -112 224 -112
WIRE -160 -96 -160 -112
WIRE 224 -80 224 -112
WIRE -64 -16 -64 -112
WIRE 80 -16 -64 -16
WIRE 496 -16 368 -16
WIRE 656 -16 544 -16
WIRE 768 -16 720 -16
WIRE 800 -16 768 -16
WIRE 912 -16 880 -16
WIRE 1008 -16 912 -16
WIRE -160 0 -160 -16
WIRE 912 0 912 -16
WIRE 1008 0 1008 -16
WIRE -64 80 -64 64
WIRE 80 80 -64 80
WIRE 384 80 384 -112
WIRE 496 80 496 64
WIRE 496 80 384 80
WIRE 544 80 544 64
WIRE 560 80 544 80
WIRE 496 96 496 80
WIRE 544 96 544 80
WIRE 912 96 912 64
WIRE 1008 96 1008 80
WIRE -64 176 -64 160
WIRE 80 176 -16 176
WIRE 496 176 368 176
WIRE 656 176 544 176
WIRE 768 176 768 -16
WIRE 768 176 720 176
WIRE -16 192 -16 176
WIRE 80 272 64 272
WIRE 400 272 368 272
WIRE 496 272 480 272
WIRE -16 288 -16 272
WIRE 0 368 -16 368
WIRE 80 368 64 368
WIRE 384 368 368 368
WIRE 480 368 464 368
WIRE 224 448 224 432
SYMBOL res 384 288 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R5
SYMATTR Value 15.8K
SYMBOL res 368 384 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R4
SYMATTR Value 49.9K
SYMBOL ind 784 0 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L5
SYMATTR Value 15.3
SYMATTR SpiceLine Rser=20m
SYMBOL ind2 480 80 R0
WINDOW 0 -3 36 Right 2
WINDOW 3 -2 69 Right 2
SYMATTR InstName L2
SYMATTR Value 82.5
SYMATTR Type ind
SYMATTR SpiceLine Rser=50m
SYMBOL ind2 560 80 M0
WINDOW 0 -3 41 Right 2
WINDOW 3 -1 73 Right 2
SYMATTR InstName L4
SYMATTR Value 165
SYMATTR Type ind
SYMATTR SpiceLine Rser=72m
SYMBOL PowerProducts\\LT3999 224 176 R0
SYMATTR InstName U1
SYMBOL cap 896 0 R0
SYMATTR InstName C2
SYMATTR Value 10
SYMATTR SpiceLine Rser=10m
SYMBOL ind2 480 -32 R0
WINDOW 0 0 42 Right 2
WINDOW 3 -1 79 Right 2
SYMATTR InstName L1
SYMATTR Value 82.5
SYMATTR Type ind
SYMATTR SpiceLine Rser=50m
SYMBOL voltage -160 -112 R0
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL schottky 656 0 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value MBRS1100
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 64 352 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value .01
SYMBOL schottky 656 192 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D2
SYMATTR Value MBRS1100
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 992 -16 R0
SYMATTR InstName Rout
SYMATTR Value 30
SYMBOL res -80 -32 R0
SYMATTR InstName R1
SYMATTR Value 255K
SYMBOL ind2 560 -32 M0
WINDOW 0 0 43 Right 2
WINDOW 3 -1 76 Right 2
SYMATTR InstName L3
SYMATTR Value 165
SYMATTR Type ind
SYMATTR SpiceLine Rser=72m
SYMBOL res -80 64 R0
SYMATTR InstName R2
SYMATTR Value 10K
SYMBOL res -32 176 R0
SYMATTR InstName R3
SYMATTR Value 28K
FLAG 224 448 0
FLAG -64 176 0
FLAG 64 272 0
FLAG -16 368 0
FLAG -160 0 0
FLAG -16 288 0
FLAG 480 368 0
FLAG 496 272 0
FLAG 560 80 0
FLAG 912 96 0
FLAG 1008 96 0
FLAG -160 -112 IN
FLAG 1008 -16 OUT
TEXT 512 -24 Bottom 2 !K1 L1 L2 L3 L4 1
TEXT 608 368 Left 2 !.tran 1.5m startup