* SPICE netlist
R1 N001 N002 5.7m
R2 N001 N007 49.9K
R3 N008 N007 1.74K
R4 N008 0 2.67K
R5 OUT N006 43.5K
R6 0 N006 3.57K
R7 OUT N009 24K
C2 N012 0 .1
C3 N013 0 68n
C4 OUT 0 220
R8 0 OUT {Rload}
R9 N003 N005 10
V4 N011 0 PWL(0 3.1 1 3.1 1.0001 0 1.2 0 1.20001 0)
R11 N004 N005 100K
C1 N004 0 10n
C5 N007 0 0.1
XU1 N002 N001 MP_01 N007 N008 0 N010 MP_02 MP_03 MP_04 MP_05 N013 MP_06 N011 MP_07 MP_08 MP_09 N006 N012 N009 MP_10 MP_11 OUT N005 LTC4260 uvautoretry=1 ovautoretry=1 ocautoretry=1 ;pnba Sense)Vdd))UV)OV)GND)ON)))))Timer))_BD_PRST))))FB)INTVcc)GPIO)))Source)Gate
V9 N010 0 PWL(0 0 1u 3.1 1 3.1 1.0001 3.1)
V1 N001 0 PWL(0 0 10u 0 100u 60 1.8 60 +0.1m 60)
M1 N002 N003 OUT OUT PSMN4R8100BSE
.tran 0 2.5 0
.step param Rload list 1 10 50 100

* LTspice schematic (.asc)
Version 4
SHEET 1 1408 672
WIRE -592 -336 -688 -336
WIRE -304 -336 -592 -336
WIRE -288 -336 -304 -336
WIRE -192 -336 -208 -336
WIRE -48 -336 -192 -336
WIRE 144 -336 48 -336
WIRE 384 -336 144 -336
WIRE 496 -336 384 -336
WIRE 592 -336 496 -336
WIRE 704 -336 592 -336
WIRE -688 -320 -688 -336
WIRE 592 -320 592 -336
WIRE 704 -320 704 -336
WIRE 32 -256 32 -288
WIRE -688 -224 -688 -240
WIRE 592 -224 592 -256
WIRE 704 -224 704 -240
WIRE -592 -192 -592 -336
WIRE 384 -192 384 -336
WIRE -80 -160 -112 -160
WIRE 32 -160 32 -176
WIRE 32 -160 0 -160
WIRE -112 -144 -112 -160
WIRE 496 -144 496 -336
WIRE 384 -96 384 -112
WIRE 384 -96 304 -96
WIRE 384 -80 384 -96
WIRE -592 -64 -592 -112
WIRE -592 -64 -688 -64
WIRE -480 -64 -592 -64
WIRE -112 -64 -112 -80
WIRE -592 -32 -592 -64
WIRE -304 -32 -304 -336
WIRE -192 -32 -192 -336
WIRE 32 -32 32 -160
WIRE 144 -32 144 -336
WIRE -688 -16 -688 -64
WIRE -480 16 -480 -64
WIRE -400 16 -480 16
WIRE 304 16 304 -96
WIRE 304 16 256 16
WIRE 384 16 384 0
WIRE -688 64 -688 48
WIRE -592 80 -592 48
WIRE -400 80 -592 80
WIRE 496 80 496 -64
WIRE 496 80 256 80
WIRE -592 112 -592 80
WIRE -400 144 -480 144
WIRE 336 144 256 144
WIRE -592 208 -592 192
WIRE 336 224 336 144
WIRE -480 240 -480 144
WIRE -64 256 -64 240
WIRE 96 256 96 240
WIRE -224 272 -224 240
WIRE 336 320 336 304
WIRE -480 336 -480 320
WIRE -64 336 -64 320
WIRE 96 336 96 320
FLAG -592 208 0
FLAG -224 272 0
FLAG 384 16 0
FLAG -64 336 0
FLAG 96 336 0
FLAG -480 336 0
FLAG -688 -224 0
FLAG 592 -224 0
FLAG 704 -224 0
FLAG 336 320 0
FLAG -112 -64 0
FLAG -688 64 0
FLAG 592 -336 OUT
SYMBOL res -304 -320 R270
SYMATTR InstName R1
SYMATTR Value 5.7m
SYMBOL res -608 -208 R0
SYMATTR InstName R2
SYMATTR Value 49.9K
SYMBOL res -608 64 M180
SYMATTR InstName R3
SYMATTR Value 1.74K
SYMBOL res -608 96 R0
SYMATTR InstName R4
SYMATTR Value 2.67K
SYMBOL res 368 -208 R0
SYMATTR InstName R5
SYMATTR Value 43.5K
SYMBOL res 368 16 M180
SYMATTR InstName R6
SYMATTR Value 3.57K
SYMBOL res 480 -160 R0
SYMATTR InstName R7
SYMATTR Value 24K
SYMBOL cap -80 256 R0
SYMATTR InstName C2
SYMATTR Value .1
SYMBOL cap 80 256 R0
SYMATTR InstName C3
SYMATTR Value 68n
SYMBOL cap 576 -320 R0
SYMATTR InstName C4
SYMATTR Value 220
SYMBOL res 688 -224 M180
SYMATTR InstName R8
SYMATTR Value {Rload}
SYMBOL res 16 -272 R0
SYMATTR InstName R9
SYMATTR Value 10
SYMBOL voltage 336 208 R0
SYMATTR InstName V4
SYMATTR Value PWL(0 3.1 1 3.1 1.0001 0 1.2 0 1.20001 0)
SYMBOL res -96 -144 R270
SYMATTR InstName R11
SYMATTR Value 100K
SYMBOL cap -128 -144 R0
SYMATTR InstName C1
SYMATTR Value 10n
SYMBOL cap -704 -16 R0
SYMATTR InstName C5
SYMATTR Value 0.1
SYMBOL PowerProducts\\LTC4260 -80 96 R0
SYMATTR InstName U1
SYMATTR SpiceLine uvautoretry=1 ovautoretry=1 ocautoretry=1
SYMBOL voltage -480 224 R0
SYMATTR InstName V9
SYMATTR Value PWL(0 0 1u 3.1 1 3.1 1.0001 3.1)
SYMBOL voltage -688 -336 M0
SYMATTR InstName V1
SYMATTR Value PWL(0 0 10u 0 100u 60 1.8 60 +0.1m 60)
SYMBOL nmos -48 -288 R270
SYMATTR InstName M1
SYMATTR Value PSMN4R8100BSE