* SPICE netlist
C1 SS 0 10n
C2 N008 0 2.2n
V1 IN 0 PWL(0 0 100u 48 6m 48); 6.1m 11 7m 11 7.1m 12 8m 12 8.1m 13 9m 13 9.1m 24 10m 24)
R1 SW1 N001 5m
C3 N002 SW1 .1
MQ1 IN TG1 SW1 SW1 BSC014N04LSI m=2
MQ2 SW1 BG1 0 0 BSC010N04LSI
L1 N001 SW2 6.8 Rser=3m
MQ3 OUT TG2 SW2 SW2 BSC009NE2LS5I
MQ4 SW2 BG2 0 0 BSC015NE2LS5I m=2
C4 SW2 N003 .1
R3 N007 0 100k
R4 OUT FB 110K
C5 INTVcc 0 4.7
C6 N005 0 .47
R5 FB 0 10K
R6 _PGOOD INTVcc 100K
R7 N004 0 165k
R8 IN N004 383K
R9 VC N008 30K
C8 IN 0 180 x2
Rload OUT 0 2.4
C9 OUT 0 220 x2 Rser=15m
XU1 BG1 N002 SW1 TG1 SW1 N001 IN INTVcc N004 MP_01 N006 N005 MP_02 MP_03 MP_04 MP_05 _PGOOD SS FB VC N007 0 MP_06 OUT TG2 SW2 N003 BG2 0 LT8253 ;pnba BG1)BST1)SW1)TG1)LSP)LSN)Vin)INTVcc)EN/UVLO))VOUTEN)Vref)))))_PGood)SS)FB)Vc)RT)Sync/SPRD))Vout)TG2)SW2)BST2)BG2)GND
V2 N006 0 PWL(0 0 1m 0 1.001m 5 2m 5)
.tran 100m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 2048 1536
WIRE -912 -768 -1024 -768
WIRE -816 -768 -912 -768
WIRE -672 -768 -816 -768
WIRE 656 -768 368 -768
WIRE 752 -768 656 -768
WIRE 864 -768 752 -768
WIRE 1024 -768 864 -768
WIRE -1024 -752 -1024 -768
WIRE -912 -752 -912 -768
WIRE -672 -752 -672 -768
WIRE 368 -752 368 -768
WIRE 656 -752 656 -768
WIRE 1024 -752 1024 -768
WIRE -720 -672 -784 -672
WIRE 608 -672 416 -672
WIRE -912 -656 -912 -688
WIRE 656 -656 656 -688
WIRE 1024 -656 1024 -672
WIRE -672 -640 -672 -656
WIRE -480 -640 -672 -640
WIRE -384 -640 -480 -640
WIRE -272 -640 -384 -640
WIRE -144 -640 -272 -640
WIRE -128 -640 -144 -640
WIRE -16 -640 -48 -640
WIRE 0 -640 -16 -640
WIRE 112 -640 80 -640
WIRE 224 -640 112 -640
WIRE 320 -640 224 -640
WIRE 368 -640 368 -656
WIRE 368 -640 320 -640
WIRE -1024 -624 -1024 -672
WIRE -672 -624 -672 -640
WIRE 368 -624 368 -640
WIRE -272 -560 -272 -640
WIRE -144 -560 -144 -640
WIRE -16 -560 -16 -640
WIRE 112 -560 112 -640
WIRE -720 -544 -752 -544
WIRE 448 -544 416 -544
WIRE -672 -512 -672 -528
WIRE 368 -512 368 -528
WIRE -480 -480 -480 -640
WIRE -464 -480 -480 -480
WIRE -384 -480 -400 -480
WIRE 240 -480 224 -480
WIRE 320 -480 320 -640
WIRE 320 -480 304 -480
WIRE -752 -384 -752 -544
WIRE -480 -384 -752 -384
WIRE -384 -384 -480 -384
WIRE 320 -384 224 -384
WIRE 448 -384 448 -544
WIRE 448 -384 320 -384
WIRE -784 -304 -784 -672
WIRE -480 -304 -784 -304
WIRE -384 -304 -480 -304
WIRE 320 -304 224 -304
WIRE 608 -304 608 -672
WIRE 608 -304 320 -304
WIRE -816 -224 -816 -768
WIRE -384 -224 -816 -224
WIRE 752 -224 752 -768
WIRE 752 -224 224 -224
WIRE -816 -208 -816 -224
WIRE -384 -128 -816 -128
WIRE -816 -112 -816 -128
WIRE -672 -32 -688 -32
WIRE -592 -32 -608 -32
WIRE -448 -32 -592 -32
WIRE -384 -32 -448 -32
WIRE 864 -32 864 -768
WIRE -816 -16 -816 -32
WIRE -592 64 -592 -32
WIRE -576 64 -592 64
WIRE -448 64 -496 64
WIRE -384 64 -448 64
WIRE 560 64 224 64
WIRE 864 64 864 48
WIRE 864 64 560 64
WIRE 864 80 864 64
WIRE -592 160 -608 160
WIRE -384 160 -528 160
WIRE 864 176 864 160
WIRE -384 256 -736 256
WIRE -736 304 -736 256
WIRE -384 432 -400 432
WIRE 240 432 224 432
WIRE -736 464 -736 384
WIRE -272 560 -272 528
WIRE -80 560 -80 528
WIRE -272 592 -272 560
WIRE -80 592 -80 560
WIRE 112 592 112 528
WIRE -272 688 -272 656
WIRE -80 688 -80 672
WIRE 112 688 112 672
WIRE -80 768 -80 752
FLAG 240 432 0
FLAG -272 688 0
FLAG 112 688 0
FLAG -80 768 0
FLAG -1024 -624 0
FLAG -816 -16 0
FLAG 1024 -656 0
FLAG -1024 -768 IN
FLAG -672 -512 0
FLAG 368 -512 0
FLAG 864 176 0
FLAG -688 -32 0
FLAG -608 160 0
FLAG 1024 -768 OUT
FLAG -400 432 0
FLAG -912 -656 0
FLAG 656 -656 0
FLAG -80 560 VC
FLAG 560 64 FB
FLAG -480 -384 BG1
FLAG -480 -304 TG1
FLAG 320 -384 BG2
FLAG 320 -304 TG2
FLAG -384 -640 SW1
FLAG 224 -640 SW2
FLAG -448 64 _PGOOD
FLAG -448 -32 INTVcc
FLAG -272 560 SS
FLAG -736 464 0
SYMBOL cap -288 592 R0
SYMATTR InstName C1
SYMATTR Value 10n
SYMBOL cap -96 688 R0
SYMATTR Value 2.2n
SYMATTR InstName C2
SYMBOL voltage -1024 -768 M0
SYMATTR InstName V1
SYMATTR Value PWL(0 0 100u 48 6m 48); 6.1m 11 7m 11 7.1m 12 8m 12 8.1m 13 9m 13 9.1m 24 10m 24)
SYMBOL res -144 -624 R270
SYMATTR InstName R1
SYMATTR Value 5m
SYMBOL cap -400 -496 R90
SYMATTR InstName C3
SYMATTR Value .1
SYMBOL nmos -720 -752 R0
SYMATTR InstName Q1
SYMATTR Value BSC014N04LSI
SYMATTR Value2 m=2
SYMBOL nmos -720 -624 R0
SYMATTR InstName Q2
SYMATTR Value BSC010N04LSI
SYMBOL ind -16 -624 R270
SYMATTR InstName L1
SYMATTR Value 6.8
SYMATTR SpiceLine Rser=3m
SYMBOL nmos 416 -752 M0
SYMATTR InstName Q3
SYMATTR Value BSC009NE2LS5I
SYMBOL nmos 416 -624 M0
SYMATTR InstName Q4
SYMATTR Value BSC015NE2LS5I
SYMATTR Value2 m=2
SYMBOL cap 304 -496 R90
SYMATTR InstName C4
SYMATTR Value .1
SYMBOL res 96 576 R0
SYMATTR InstName R3
SYMATTR Value 100k
SYMBOL res 848 -48 R0
SYMATTR InstName R4
SYMATTR Value 110K
SYMBOL cap -608 -48 R90
SYMATTR InstName C5
SYMATTR Value 4.7
SYMBOL cap -528 144 R90
SYMATTR InstName C6
SYMATTR Value .47
SYMBOL res 848 64 R0
SYMATTR InstName R5
SYMATTR Value 10K
SYMBOL res -480 48 R90
SYMATTR InstName R6
SYMATTR Value 100K
SYMBOL res -832 -128 R0
SYMATTR InstName R7
SYMATTR Value 165k
SYMBOL res -832 -224 R0
SYMATTR InstName R8
SYMATTR Value 383K
SYMBOL res -96 576 R0
SYMATTR InstName R9
SYMATTR Value 30K
SYMBOL cap -928 -752 R0
SYMATTR Value 180
SYMATTR Value2 x2
SYMATTR InstName C8
SYMBOL res 1008 -768 R0
SYMATTR InstName Rload
SYMATTR Value 2.4
SYMBOL cap 640 -752 R0
SYMATTR Value 220
SYMATTR Value2 x2
SYMATTR InstName C9
SYMATTR SpiceLine Rser=15m
SYMBOL LT8253 -80 -16 R0
SYMATTR InstName U1
SYMBOL voltage -736 288 M0
SYMATTR InstName V2
SYMATTR Value PWL(0 0 1m 0 1.001m 5 2m 5)