* SPICE netlist
M2 N001 N003 VOUT VOUT PSMN4R8100BSE Tambient=55 RthetaJA=35 Cheatsink=0 Imult=9.43E+1 Iexponent=1.00E-3 C6=1.64E-4 R6=4.40E-3 C5=8.20E-4 R5=2.20E-2 C4=3.30E-3 R4=1.10E-1 C3=1.00E-1 R3=2.70E-1 C2=1.55E-1 R2=0.1m C1=0 R1=0.1m
R7 N003 N009 10
V1 VIN 0 PWL(2m 0.01 20m 48 450m 48 500m 0)
R12 N001 VIN 1m
R25 VOUT N015 100K
R26 N015 0 2.55K
R27 N012 N011 20K
C3 0 N012 47n
C7 VOUT N010 1
R28 VIN N008 100K
C8 0 N013 1
C10 N014 0 1
R32 N014 N019 100K
R37 N019 0 6.34K
R39 N017 N016 1Meg
R40 N017 N018 1Meg
R41 N021 N020 1Meg
R42 VIN N004 100
C2 N008 0 100n
C1 N024 0 10n
C4 N025 0 47n
C5 N026 0 22n
R1 N017 N021 100k
R3 VIN N005 10
R4 N001 N006 10
C6 0 N004 100n
R5 N008 0 2.5K
R2 VOUT 0 15K
M1 N001 N002 VOUT VOUT PSMN4R8100BSE Tambient=55 RthetaJA=35 Cheatsink=0 Imult=9.43E+1 Iexponent=1.00E-3 C6=1.64E-4 R6=4.40E-3 C5=8.20E-4 R5=2.20E-2 C4=3.30E-3 R4=1.10E-1 C3=1.00E-1 R3=2.70E-1 C2=1.55E-1 R2=0.1m C1=0 R1=0.1m
R6 N002 N009 10
R9 N007 0 1.5K
R10 VIN N007 100K
C9 N007 0 100n
R11 N022 N025 2.32K
R13 N025 0 100K
R14 N026 0 330K
R15 N023 N026 15K
V3 N017 0 3.3
R16 N001 VIN 1m
C11 VOUT 0 12
R17 N014 0 100K
I1 VOUT 0 4 load
XU1 0 N019 N014 N022 N023 N018 N007 N024 N013 N010 N011 NC_01 N008 N008 N021 N020 N016 N015 0 N004 VOUT N009 N005 N006 ADM1273 rndstart_dis=0 fhdis=0 restart_time=100 PWRGD_sense=0 rnd_cycles=5 oc_filt_select=0 oc_trip_select=2 oc_retry_dis=0 fast_gate_dis=0 ;pnba ISET)ISTART)VCAP)ESTART)EFAULT)ENABLE)OV)RND)VREG)VCP)DVDT)MCB)UVL)UVH)_FAULT)_RESTART)PWRGD)PWGIN)GND)VCC)VOUT)GATE)SENSE+)SENSE-
.tran 0 600m 0

* LTspice schematic (.asc)
Version 4.1
SHEET 1 1616 1120
WIRE 24 -544 8 -544
WIRE 120 -544 104 -544
WIRE 248 -528 184 -528
WIRE 440 -528 344 -528
WIRE 408 -480 328 -480
WIRE -760 -448 -792 -448
WIRE -696 -448 -760 -448
WIRE -472 -448 -696 -448
WIRE -280 -448 -472 -448
WIRE 8 -448 8 -544
WIRE 8 -448 -280 -448
WIRE 24 -448 8 -448
WIRE 120 -448 120 -544
WIRE 120 -448 104 -448
WIRE 184 -448 184 -528
WIRE 184 -448 120 -448
WIRE 248 -448 184 -448
WIRE 440 -448 440 -528
WIRE 440 -448 344 -448
WIRE 552 -448 440 -448
WIRE 616 -448 552 -448
WIRE 696 -448 616 -448
WIRE 760 -448 696 -448
WIRE 808 -448 760 -448
WIRE -280 -432 -280 -448
WIRE 808 -432 808 -448
WIRE 616 -416 616 -448
WIRE 696 -416 696 -448
WIRE -792 -400 -792 -448
WIRE 8 -368 8 -448
WIRE 120 -368 120 -448
WIRE 328 -368 328 -400
WIRE 408 -368 408 -480
WIRE -280 -336 -280 -352
WIRE -104 -336 -280 -336
WIRE -696 -320 -696 -448
WIRE -472 -320 -472 -448
WIRE -280 -320 -280 -336
WIRE 616 -320 616 -352
WIRE 696 -320 696 -336
WIRE 808 -320 808 -352
WIRE -792 -288 -792 -320
WIRE -104 -272 -104 -336
WIRE 8 -272 8 -288
WIRE 120 -272 120 -288
WIRE -280 -240 -280 -256
WIRE -696 -208 -696 -240
WIRE -696 -208 -792 -208
WIRE -600 -208 -696 -208
WIRE -472 -208 -472 -240
WIRE -472 -208 -552 -208
WIRE -376 -208 -472 -208
WIRE -200 -208 -376 -208
WIRE 328 -208 328 -288
WIRE 328 -208 216 -208
WIRE 408 -208 408 -288
WIRE 408 -208 328 -208
WIRE -696 -192 -696 -208
WIRE -792 -176 -792 -208
WIRE -552 -176 -552 -208
WIRE -472 -176 -472 -208
WIRE -376 -128 -376 -208
WIRE -200 -128 -376 -128
WIRE 312 -128 216 -128
WIRE 552 -128 552 -448
WIRE 552 -128 312 -128
WIRE -792 -80 -792 -112
WIRE -696 -80 -696 -112
WIRE -552 -80 -552 -112
WIRE -472 -80 -472 -96
WIRE -600 -48 -600 -208
WIRE -200 -48 -600 -48
WIRE 232 -48 216 -48
WIRE 312 -48 312 -128
WIRE 312 -48 296 -48
WIRE 552 -32 552 -128
WIRE 296 16 216 16
WIRE 392 16 376 16
WIRE 472 16 456 16
WIRE -312 32 -344 32
WIRE -200 32 -248 32
WIRE -648 80 -792 80
WIRE -344 80 -648 80
WIRE -200 80 -344 80
WIRE 552 80 552 48
WIRE 552 80 216 80
WIRE -344 96 -344 80
WIRE 552 96 552 80
WIRE -648 144 -648 80
WIRE 232 144 216 144
WIRE 456 144 312 144
WIRE -344 192 -344 176
WIRE -200 192 -344 192
WIRE -344 208 -344 192
WIRE 344 208 216 208
WIRE 456 208 456 144
WIRE 456 208 424 208
WIRE 552 208 552 176
WIRE -792 240 -792 80
WIRE -648 240 -648 224
WIRE -200 240 -648 240
WIRE -648 256 -648 240
WIRE 232 272 216 272
WIRE 328 272 312 272
WIRE -200 288 -552 288
WIRE -200 336 -360 336
WIRE 328 336 328 272
WIRE 328 336 216 336
WIRE 344 336 328 336
WIRE 456 336 456 208
WIRE 456 336 424 336
WIRE -792 352 -792 304
WIRE -648 352 -648 336
WIRE -552 352 -552 288
WIRE -360 352 -360 336
WIRE 456 368 456 336
WIRE -200 400 -264 400
WIRE -264 416 -264 400
WIRE -552 448 -552 432
WIRE -552 448 -648 448
WIRE -360 448 -360 432
WIRE -360 448 -456 448
WIRE -552 464 -552 448
WIRE -456 464 -456 448
WIRE -360 464 -360 448
WIRE 8 464 8 448
WIRE 456 464 456 448
WIRE -648 480 -648 448
WIRE -264 496 -264 480
WIRE -648 560 -648 544
WIRE -552 560 -552 544
WIRE -456 560 -456 528
WIRE -360 560 -360 544
FLAG -792 -288 0
FLAG 8 464 0
FLAG 760 -448 VOUT
FLAG -760 -448 VIN
FLAG 552 208 0
FLAG 472 16 0
FLAG -552 -80 0
FLAG -344 32 0
FLAG -264 496 0
FLAG -280 -240 0
FLAG 696 -320 0
FLAG -696 -80 0
FLAG -792 -80 0
FLAG -472 -80 0
FLAG -552 560 0
FLAG 456 464 0
FLAG -344 208 0
FLAG 616 -320 0
FLAG 808 -320 0
FLAG -792 352 0
FLAG -648 352 0
FLAG -456 560 0
FLAG -360 560 0
FLAG -648 560 0
SYMBOL nmos 248 -400 R270
SYMATTR InstName M2
SYMATTR Value PSMN4R8100BSE
SYMATTR Value2 Tambient=55 RthetaJA=35 Cheatsink=0 Imult=9.43E+1 Iexponent=1.00E-3 C6=1.64E-4 R6=4.40E-3 C5=8.20E-4 R5=2.20E-2 C4=3.30E-3 R4=1.10E-1 C3=1.00E-1 R3=2.70E-1 C2=1.55E-1 R2=0.1m C1=0 R1=0.1m
SYMBOL res 312 -384 R0
SYMATTR InstName R7
SYMATTR Value 10
SYMBOL voltage -792 -416 M0
SYMATTR InstName V1
SYMATTR Value PWL(2m 0.01 20m 48 450m 48 500m 0)
SYMBOL res 120 -464 R90
SYMATTR InstName R12
SYMATTR Value 1m
SYMBOL res 536 -48 R0
SYMATTR InstName R25
SYMATTR Value 100K
SYMBOL res 536 80 R0
SYMATTR InstName R26
SYMATTR Value 2.55K
SYMBOL res 392 0 R90
SYMATTR InstName R27
SYMATTR Value 20K
SYMBOL cap 456 0 R90
SYMATTR InstName C3
SYMATTR Value 47n
SYMBOL cap 296 -64 R90
SYMATTR InstName C7
SYMATTR Value 1
SYMBOL res -488 -336 R0
SYMATTR InstName R28
SYMATTR Value 100K
SYMBOL cap -312 16 M90
SYMATTR InstName C8
SYMATTR Value 1
SYMBOL cap -808 240 R0
SYMATTR InstName C10
SYMATTR Value 1
SYMBOL res -664 128 R0
SYMATTR InstName R32
SYMATTR Value 100K
SYMBOL res -664 240 R0
SYMATTR InstName R37
SYMATTR Value 6.34K
SYMBOL res 328 128 R90
SYMATTR InstName R39
SYMATTR Value 1Meg
SYMBOL res 440 192 R90
SYMATTR InstName R40
SYMATTR Value 1Meg
SYMBOL res 328 256 R90
SYMATTR InstName R41
SYMATTR Value 1Meg
SYMBOL res -296 -448 R0
SYMATTR InstName R42
SYMATTR Value 100
SYMBOL cap -568 -176 R0
SYMATTR InstName C2
SYMATTR Value 100n
SYMBOL cap -280 416 R0
SYMATTR InstName C1
SYMATTR Value 10n
SYMBOL cap -664 480 R0
SYMATTR InstName C4
SYMATTR Value 47n
SYMBOL cap -472 464 R0
SYMATTR Value 22n
SYMATTR InstName C5
SYMBOL res 440 320 R90
SYMATTR InstName R1
SYMATTR Value 100k
SYMBOL res -8 -384 R0
SYMATTR InstName R3
SYMATTR Value 10
SYMBOL res 104 -384 R0
SYMATTR InstName R4
SYMATTR Value 10
SYMBOL cap -296 -256 M180
SYMATTR InstName C6
SYMATTR Value 100n
SYMBOL res -488 -192 R0
SYMATTR InstName R5
SYMATTR Value 2.5K
SYMBOL res 680 -432 R0
SYMATTR InstName R2
SYMATTR Value 15K
SYMBOL nmos 248 -480 R270
SYMATTR InstName M1
SYMATTR Value PSMN4R8100BSE
SYMATTR Value2 Tambient=55 RthetaJA=35 Cheatsink=0 Imult=9.43E+1 Iexponent=1.00E-3 C6=1.64E-4 R6=4.40E-3 C5=8.20E-4 R5=2.20E-2 C4=3.30E-3 R4=1.10E-1 C3=1.00E-1 R3=2.70E-1 C2=1.55E-1 R2=0.1m C1=0 R1=0.1m
SYMBOL res 392 -384 R0
SYMATTR InstName R6
SYMATTR Value 10
SYMBOL res -712 -208 R0
SYMATTR InstName R9
SYMATTR Value 1.5K
SYMBOL res -712 -336 R0
SYMATTR InstName R10
SYMATTR Value 100K
SYMBOL cap -808 -176 R0
SYMATTR InstName C9
SYMATTR Value 100n
SYMBOL res -568 336 R0
SYMATTR InstName R11
SYMATTR Value 2.32K
SYMBOL res -568 448 R0
SYMATTR InstName R13
SYMATTR Value 100K
SYMBOL res -376 448 R0
SYMATTR InstName R14
SYMATTR Value 330K
SYMBOL res -376 336 R0
SYMATTR InstName R15
SYMATTR Value 15K
SYMBOL voltage 456 352 R0
SYMATTR InstName V3
SYMATTR Value 3.3
SYMBOL res 120 -560 R90
SYMATTR InstName R16
SYMATTR Value 1m
SYMBOL cap 600 -416 R0
SYMATTR InstName C11
SYMATTR Value 12
SYMBOL res -360 80 R0
SYMATTR InstName R17
SYMATTR Value 100K
SYMBOL current 808 -432 R0
SYMATTR SpiceLine load
SYMATTR InstName I1
SYMATTR Value 4
SYMBOL ADM1273 8 80 R0
SYMATTR InstName U1