* SPICE netlist
R1 VCC ENABLE 10
C4 PSET 0 10n
R2 ENABLE D .5m
R4 G1 GATE 10
R22 D S- 10
R21 ENABLE S+ 10
C5 TIMER 0 10n
R9 VCAP PSET 100k
R10 PSET 0 11.5k
R24 vOUT PWGIN 51k
R16 ENABLE PWRGD 10K
R7 ENABLE OV 51k
R8 OV 0 3k
R13 VCAP ISET 100k
R14 ISET 0 51k
R11 VCAP ISTART 100k
R12 ISTART 0 5k
C7 0 GATE 22n
C2 OV 0 10n
V4 ENABLE 0 PWL(0 0.01 50M 12 180M 12 250M 0)
R26 S+ MO+ 100
R27 S- MO- 100
C9 MO- MO+ 100n
C8 MO+ 0 100n
C10 0 MO- 100n
R15 _FAULT ENABLE 100K
Rload vOUT 0 {RLOAD}
M3 D N001 vOUT vOUT PSMN0R925YLC 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
R18 N002 GATE 10
R19 N001 GATE 10
R20 ENABLE S+ 10
R23 D S- 10
R6 UV 0 6k
R5 ENABLE UV 51k
C1 UV 0 100n
C6 VCC 0 1
C3 VCAP 0 1
R17 vOUT N003 1k
Cload vOUT 0 {CLOAD}
R25 PWGIN 0 5k
R3 ENABLE D .5m
M1 D G1 vOUT vOUT PSMN0R925YLC 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
M2 D N002 vOUT vOUT PSMN0R925YLC 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
XU2 _RETRY ENABLE S+ S- ISET ISTART MO+ MO- OV PSET PWGIN UV VCC _FAULT CSOUT GATE 0 0 PWRGD TIMER VCAP N003 ADM1278 oc_filt_select=1 oc_trip_select=1 fhdis=0 oc_retry_dis=0 ;pnba _RETRY)EN)HS+)HS-)Iset)Istart)MO+)MO-)OV)Pset)PWGin)UV)Vcc)_FAULT)CSout)GATE)GND)PGND)PWRGD)TIMER)Vcap)Vout
.tran 250m startup
.param RLOAD=1K CLOAD=1000u

* LTspice schematic (.asc)
Version 4
SHEET 1 2640 1648
WIRE 328 -808 280 -808
WIRE 728 -808 424 -808
WIRE -104 -792 -104 -824
WIRE 56 -792 56 -824
WIRE 408 -712 408 -760
WIRE -216 -664 -248 -664
WIRE -104 -664 -104 -712
WIRE -104 -664 -152 -664
WIRE -56 -664 -104 -664
WIRE 56 -664 56 -712
WIRE 56 -664 8 -664
WIRE 104 -664 56 -664
WIRE 200 -664 168 -664
WIRE -248 -632 -248 -664
WIRE 200 -632 200 -664
WIRE -104 -616 -104 -664
WIRE 56 -616 56 -664
WIRE 280 -568 280 -808
WIRE 472 -568 280 -568
WIRE 728 -568 728 -808
WIRE 728 -568 568 -568
WIRE 552 -472 552 -520
WIRE -56 -424 -168 -424
WIRE 120 -424 24 -424
WIRE 280 -392 280 -568
WIRE -1208 -328 -1304 -328
WIRE -984 -328 -1208 -328
WIRE -360 -328 -984 -328
WIRE -168 -328 -168 -424
WIRE -168 -328 -360 -328
WIRE -88 -328 -168 -328
WIRE -56 -328 -88 -328
WIRE 40 -328 24 -328
WIRE 120 -328 120 -424
WIRE 120 -328 40 -328
WIRE 280 -328 280 -392
WIRE 280 -328 120 -328
WIRE 616 -328 280 -328
WIRE 728 -328 728 -568
WIRE 728 -328 712 -328
WIRE 824 -328 728 -328
WIRE 936 -328 824 -328
WIRE 1112 -328 936 -328
WIRE 1320 -328 1112 -328
WIRE -1304 -280 -1304 -328
WIRE 1112 -248 1112 -328
WIRE 1320 -248 1320 -328
WIRE -168 -216 -168 -328
WIRE -88 -216 -88 -328
WIRE 40 -216 40 -328
WIRE 120 -216 120 -328
WIRE 696 -152 696 -280
WIRE -1304 -136 -1304 -200
WIRE -168 -120 -168 -136
WIRE -88 -120 -88 -136
WIRE 40 -120 40 -136
WIRE 120 -120 120 -136
WIRE 1112 -104 1112 -168
WIRE 1320 -104 1320 -184
WIRE -56 -88 -88 -120
WIRE 8 -88 40 -120
WIRE -360 -56 -360 -328
WIRE 696 -56 696 -152
WIRE -56 -40 -168 -120
WIRE -56 -40 -56 -88
WIRE 8 -40 120 -120
WIRE 8 -40 8 -88
WIRE -56 -8 -56 -40
WIRE 8 -8 8 -40
WIRE 408 56 408 -632
WIRE 408 56 280 56
WIRE 552 56 552 -392
WIRE 552 56 408 56
WIRE 696 56 696 24
WIRE 696 56 552 56
WIRE -1208 152 -1208 -328
WIRE -984 152 -984 -328
WIRE -120 152 -120 120
WIRE -56 152 -56 -8
WIRE 8 152 8 -8
WIRE 72 152 72 120
WIRE 936 168 936 -328
WIRE -440 216 -472 216
WIRE -360 216 -360 24
WIRE -360 216 -376 216
WIRE -280 216 -360 216
WIRE -232 216 -280 216
WIRE 232 216 184 216
WIRE 280 216 280 56
WIRE 280 216 232 216
WIRE 312 216 280 216
WIRE 392 216 376 216
WIRE 392 248 392 216
WIRE -1208 280 -1208 232
WIRE -1208 280 -1304 280
WIRE -280 280 -1208 280
WIRE -232 280 -280 280
WIRE 488 280 184 280
WIRE 824 280 824 -328
WIRE 824 280 568 280
WIRE -1208 328 -1208 280
WIRE -1304 344 -1304 280
WIRE -984 344 -984 232
WIRE -984 344 -1080 344
WIRE -280 344 -984 344
WIRE -232 344 -280 344
WIRE 232 344 184 344
WIRE 936 344 936 248
WIRE 936 344 232 344
WIRE -1080 376 -1080 344
WIRE -984 392 -984 344
WIRE -728 408 -888 408
WIRE -600 408 -728 408
WIRE -472 408 -600 408
WIRE -296 408 -472 408
WIRE -232 408 -296 408
WIRE 232 408 184 408
WIRE 312 408 232 408
WIRE 536 408 392 408
WIRE 552 408 536 408
WIRE -728 424 -728 408
WIRE -600 424 -600 408
WIRE -472 424 -472 408
WIRE 936 424 936 344
WIRE -888 440 -888 408
WIRE -296 472 -376 472
WIRE -232 472 -296 472
WIRE 232 472 184 472
WIRE 536 472 536 408
WIRE 536 472 232 472
WIRE -1304 504 -1304 408
WIRE -1208 504 -1208 408
WIRE -1080 504 -1080 440
WIRE -984 504 -984 472
WIRE -472 520 -472 504
WIRE -376 520 -376 472
WIRE -376 520 -472 520
WIRE -296 536 -328 536
WIRE -232 536 -296 536
WIRE 312 536 184 536
WIRE -600 552 -600 504
WIRE -328 552 -328 536
WIRE -328 552 -600 552
WIRE -728 600 -728 504
WIRE -728 600 -808 600
WIRE -296 600 -728 600
WIRE -232 600 -296 600
WIRE 232 600 184 600
WIRE 376 600 232 600
WIRE 488 600 456 600
WIRE 936 600 936 504
WIRE -728 648 -728 600
WIRE -600 648 -600 552
WIRE -472 648 -472 520
WIRE -808 664 -808 600
WIRE -280 664 -296 664
WIRE -232 664 -280 664
WIRE 312 664 184 664
WIRE -296 712 -296 664
WIRE -888 760 -888 504
WIRE -808 760 -808 728
WIRE -728 760 -728 728
WIRE -600 760 -600 728
WIRE -472 760 -472 728
WIRE -88 792 -88 728
WIRE 24 792 24 728
WIRE 24 792 -88 792
WIRE -296 808 -296 776
WIRE -88 824 -88 792
FLAG -808 760 0
FLAG -1304 -328 vIN
FLAG -472 760 0
FLAG -296 808 0
FLAG -728 760 0
FLAG -296 408 VCAP
FLAG -296 472 ISET
FLAG -296 536 ISTART
FLAG -296 600 PSET
FLAG -280 664 TIMER
FLAG 232 216 GATE
FLAG 696 -152 G1
FLAG 280 -392 D
FLAG -56 -8 S+
FLAG 8 -8 S-
FLAG -280 216 VCC
FLAG 232 408 PWRGD
FLAG -984 504 0
FLAG -600 760 0
FLAG -280 280 UV
FLAG -280 344 OV
FLAG 232 600 _FAULT
FLAG 232 344 PWGIN
FLAG 392 248 0
FLAG -1080 504 0
FLAG -1304 -136 0
FLAG -104 -824 S+
FLAG 56 -824 S-
FLAG -248 -632 0
FLAG 200 -632 0
FLAG -104 -616 MO+
FLAG 56 -616 MO-
FLAG -120 120 MO+
FLAG 72 120 MO-
FLAG 312 664 CSOUT
FLAG 232 472 ENABLE
FLAG 1320 -328 vOUT
FLAG 488 600 VIN
FLAG 552 408 VIN
FLAG 1112 -104 0
FLAG -1304 504 0
FLAG -1208 504 0
FLAG -472 216 0
FLAG -888 760 0
FLAG 1320 -104 0
FLAG 936 600 0
FLAG 312 536 _RETRY
FLAG -88 824 0
SYMBOL res -344 40 R180
SYMATTR InstName R1
SYMATTR Value 10
SYMBOL cap -824 664 R0
SYMATTR InstName C4
SYMATTR Value 10n
SYMBOL res -72 -312 R270
SYMATTR InstName R2
SYMATTR Value .5m
SYMBOL res 680 -72 R0
SYMATTR InstName R4
SYMATTR Value 10
SYMBOL res 24 -232 R0
SYMATTR InstName R22
SYMATTR Value 10
SYMBOL res -104 -232 R0
SYMATTR InstName R21
SYMATTR Value 10
SYMBOL cap -312 712 R0
SYMATTR InstName C5
SYMATTR Value 10n
SYMBOL res -744 408 R0
SYMATTR InstName R9
SYMATTR Value 100k
SYMBOL res -744 632 R0
SYMATTR InstName R10
SYMATTR Value 11.5k
SYMBOL res 920 152 R0
SYMATTR InstName R24
SYMATTR Value 51k
SYMBOL res 408 392 R90
SYMATTR InstName R16
SYMATTR Value 10K
SYMBOL res -1000 136 R0
SYMATTR InstName R7
SYMATTR Value 51k
SYMBOL res -1000 376 R0
SYMATTR InstName R8
SYMATTR Value 3k
SYMBOL res -488 408 R0
SYMATTR InstName R13
SYMATTR Value 100k
SYMBOL res -488 632 R0
SYMATTR InstName R14
SYMATTR Value 51k
SYMBOL res -616 408 R0
SYMATTR InstName R11
SYMATTR Value 100k
SYMBOL res -616 632 R0
SYMATTR InstName R12
SYMATTR Value 5k
SYMBOL cap 376 200 R90
SYMATTR InstName C7
SYMATTR Value 22n
SYMBOL cap -1096 376 R0
SYMATTR InstName C2
SYMATTR Value 10n
SYMBOL voltage -1304 -296 R0
SYMATTR InstName V4
SYMATTR Value PWL(0 0.01 50M 12 180M 12 250M 0)
SYMBOL res -120 -808 R0
SYMATTR InstName R26
SYMATTR Value 100
SYMBOL res 40 -808 R0
SYMATTR InstName R27
SYMATTR Value 100
SYMBOL cap 8 -680 R90
SYMATTR InstName C9
SYMATTR Value 100n
SYMBOL cap -152 -680 R90
SYMATTR InstName C8
SYMATTR Value 100n
SYMBOL cap 168 -680 R90
SYMATTR InstName C10
SYMATTR Value 100n
SYMBOL res 360 616 R270
SYMATTR InstName R15
SYMATTR Value 100K
SYMBOL res 1096 -264 R0
SYMATTR InstName Rload
SYMATTR Value {RLOAD}
SYMBOL nmos 328 -760 R270
SYMATTR InstName M3
SYMATTR Value PSMN0R925YLC
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 536 -488 R0
SYMATTR InstName R18
SYMATTR Value 10
SYMBOL res 392 -728 R0
SYMATTR InstName R19
SYMATTR Value 10
SYMBOL res -184 -232 R0
SYMATTR InstName R20
SYMATTR Value 10
SYMBOL res 104 -232 R0
SYMATTR InstName R23
SYMATTR Value 10
SYMBOL res -1224 312 R0
SYMATTR InstName R6
SYMATTR Value 6k
SYMBOL res -1224 136 R0
SYMATTR InstName R5
SYMATTR Value 51k
SYMBOL cap -1320 344 R0
SYMATTR InstName C1
SYMATTR Value 100n
SYMBOL cap -376 200 R90
SYMATTR InstName C6
SYMATTR Value 1
SYMBOL cap -904 440 R0
SYMATTR InstName C3
SYMATTR Value 1
SYMBOL res 584 264 R90
SYMATTR InstName R17
SYMATTR Value 1k
SYMBOL cap 1304 -248 R0
SYMATTR InstName Cload
SYMATTR Value {CLOAD}
SYMBOL res 920 408 R0
SYMATTR InstName R25
SYMATTR Value 5k
SYMBOL res -72 -408 R270
SYMATTR InstName R3
SYMATTR Value .5m
SYMBOL nmos 616 -280 R270
SYMATTR InstName M1
SYMATTR Value PSMN0R925YLC
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 nmos 472 -520 R270
SYMATTR InstName M2
SYMATTR Value PSMN0R925YLC
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 ADM1278 -24 424 R0
SYMATTR InstName U2