* SPICE netlist
R1 N006 N005 1K
C4 OUT- N006 15n
R5 N005 N008 10
C2 N005 N004 470f
M1 OUT- N008 N004 N004 IRF530
R6 N004 0 20m
R3 N001 N003 6.49K
R4 OUT+ N001 549K
C1 N001 0 0.1
R7 N003 0 10K
C3 OUT+ OUT- 100 Rser=25m
V3 N007 OUT- PWL(0 0 360m 0 360.001m 1)
S2 OUT- OUT+ N007 OUT- SoftShort
Sload OUT- OUT+ N002 OUT- Load
V1 0 OUT+ PWL(0 0 10m -48 220m -48 220.1m -70)
XU1 N002 N003 N001 0 N004 N005 OUT- OUT+ MAX5921B ;pnba PWRGD)OV)UV)VEE)SENSE)GATE)DRAIN)VDD
R2 OUT+ N002 20k
.tran 400m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 2128 720
WIRE -360 -360 -1064 -360
WIRE 8 -360 -360 -360
WIRE 408 -360 8 -360
WIRE 824 -360 408 -360
WIRE -360 -328 -360 -360
WIRE 8 -296 8 -360
WIRE 408 -280 408 -360
WIRE -360 -232 -360 -248
WIRE -360 -232 -472 -232
WIRE -248 -232 -360 -232
WIRE -360 -200 -360 -232
WIRE 408 -152 408 -200
WIRE 408 -152 296 -152
WIRE 1064 -152 408 -152
WIRE -1064 -72 -1064 -360
WIRE -360 -72 -360 -120
WIRE -248 -72 -360 -72
WIRE 232 40 232 8
WIRE 296 40 232 40
WIRE -56 104 -56 8
WIRE -24 104 -56 104
WIRE 88 104 88 8
WIRE 88 104 40 104
WIRE 120 104 88 104
WIRE 216 104 200 104
WIRE 296 104 296 40
WIRE 296 104 280 104
WIRE 824 104 824 -360
WIRE 824 104 632 104
WIRE 920 104 824 104
WIRE 1016 104 920 104
WIRE -472 120 -472 -232
WIRE -360 120 -360 -72
WIRE 1016 136 1016 104
WIRE 88 152 88 104
WIRE 632 152 632 104
WIRE 824 152 824 104
WIRE 1064 152 1064 -152
WIRE 584 168 376 168
WIRE 376 216 376 168
WIRE 584 264 584 216
WIRE 632 264 632 232
WIRE 632 264 584 264
WIRE 824 264 824 216
WIRE 824 264 632 264
WIRE 920 264 824 264
WIRE 1016 264 1016 216
WIRE 1016 264 920 264
WIRE 1064 264 1064 200
WIRE 1064 264 1016 264
WIRE 88 280 88 232
WIRE -1064 328 -1064 8
WIRE -472 328 -472 184
WIRE -472 328 -1064 328
WIRE -360 328 -360 200
WIRE -360 328 -472 328
WIRE -200 328 -200 8
WIRE -200 328 -360 328
WIRE -152 328 -200 328
WIRE -56 328 -56 104
WIRE -56 328 -72 328
WIRE 72 328 -56 328
WIRE 296 328 296 104
WIRE 296 328 168 328
WIRE 376 328 376 296
WIRE 376 328 296 328
WIRE 824 328 824 264
WIRE 824 328 376 328
WIRE -200 360 -200 328
FLAG -200 360 0
FLAG -1064 -360 IN
FLAG 920 104 OUT+
FLAG 920 264 OUT-
SYMBOL res 216 88 R90
SYMATTR InstName R1
SYMATTR Value 1K
SYMBOL cap 280 88 R90
SYMATTR InstName C4
SYMATTR Value 15n
SYMBOL res 72 136 R0
SYMATTR InstName R5
SYMATTR Value 10
SYMBOL cap 40 88 R90
SYMATTR InstName C2
SYMATTR Value 470f
SYMBOL nmos 168 280 R90
SYMATTR InstName M1
SYMATTR Value IRF530
SYMBOL res -56 312 R90
SYMATTR InstName R6
SYMATTR Value 20m
SYMBOL res -376 -216 R0
SYMATTR InstName R3
SYMATTR Value 6.49K
SYMBOL res -376 -344 R0
SYMATTR InstName R4
SYMATTR Value 549K
SYMBOL cap -488 120 R0
SYMATTR InstName C1
SYMATTR Value 0.1
SYMBOL res -376 104 R0
SYMATTR InstName R7
SYMATTR Value 10K
SYMBOL cap 808 152 R0
SYMATTR InstName C3
SYMATTR Value 100
SYMATTR SpiceLine Rser=25m
SYMBOL voltage 376 200 R0
SYMATTR InstName V3
SYMATTR Value PWL(0 0 360m 0 360.001m 1)
SYMBOL sw 632 248 M180
SYMATTR InstName S2
SYMATTR Value SoftShort
SYMBOL sw 1016 232 R180
SYMATTR InstName Sload
SYMATTR Value Load
SYMBOL voltage -1064 24 M180
SYMATTR Value PWL(0 0 10m -48 220m -48 220.1m -70)
SYMATTR InstName V1
SYMBOL MAX5921B 8 -152 R0
SYMATTR InstName U1
SYMBOL res 392 -296 R0
SYMATTR InstName R2
SYMATTR Value 20k