* SPICE netlist
XU1 N016 N014 N015 MP_01 MP_02 MP_03 MP_04 MP_05 MP_06 N012 N007 0 N010 N008 N011 0 0 0 MP_07 N009 N004 N002 MP_08 N001 LT4180 ;pnba INTVcc)Drain)Comp)))))))Chold4)FB)GND)Cosc)Rosc)OSC)DIV2)DIV1)DIV0))OV)Run)Sense))Vin
R1 N008 0 125.1k
C1 N010 0 .001
C2 0 N016 1
C3 N013 N015 220p Rser=4K Cpar=10p
R2 N001 N002 250m
R3 N001 N004 64.9K
R4 N004 N007 3.74K
R5 N007 N009 2.2K
R6 N009 0 5.36K
R7 N003 N002 4
R8 N005 0 4
C4 N003 N005 100
Q1 N013 N016 N014 0 2N2222
MQ2 IN N006 N001 N001 Si4886DY
V1 IN 0 20
R9 N006 N013 10K
R10 IN N006 27K
C5 N001 0 1
E1 OUT 0 N003 N005 1
C6 N012 0 .1
ILoadCurrent N003 N005 PULSE(40m 400m 40m 2m 2m 18m 40m) load
.tran 80m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1776 800
WIRE 888 -400 872 -400
WIRE -776 -368 -888 -368
WIRE -712 -368 -776 -368
WIRE -584 -368 -616 -368
WIRE -504 -368 -584 -368
WIRE -232 -368 -504 -368
WIRE -168 -368 -232 -368
WIRE -40 -368 -88 -368
WIRE 72 -368 -40 -368
WIRE 232 -368 152 -368
WIRE 344 -368 232 -368
WIRE 824 -368 344 -368
WIRE -888 -352 -888 -368
WIRE -584 -352 -584 -368
WIRE -504 -352 -504 -368
WIRE 232 -352 232 -368
WIRE 344 -352 344 -368
WIRE 872 -352 872 -400
WIRE 824 -336 824 -368
WIRE -232 -288 -232 -368
WIRE -584 -272 -584 -288
WIRE -888 -256 -888 -272
WIRE -504 -256 -504 -272
WIRE -392 -256 -504 -256
WIRE -40 -256 -40 -368
WIRE -40 -256 -72 -256
WIRE 72 -256 24 -256
WIRE 232 -256 232 -288
WIRE 232 -256 152 -256
WIRE 344 -256 344 -272
WIRE 344 -256 232 -256
WIRE 824 -256 824 -288
WIRE 824 -256 344 -256
WIRE 872 -256 872 -272
WIRE -776 -224 -776 -368
WIRE -744 -224 -776 -224
WIRE -632 -224 -632 -320
WIRE -632 -224 -664 -224
WIRE -504 -160 -504 -176
WIRE -392 -160 -504 -160
WIRE -40 -160 -72 -160
WIRE 56 -160 40 -160
WIRE -504 -64 -504 -80
WIRE -392 -64 -504 -64
WIRE -40 -64 -72 -64
WIRE 40 -64 24 -64
WIRE -632 -48 -632 -224
WIRE -504 32 -504 16
WIRE -392 32 -408 32
WIRE -56 32 -72 32
WIRE -472 128 -488 128
WIRE -392 128 -408 128
WIRE -56 128 -72 128
WIRE -632 224 -632 32
WIRE -552 224 -632 224
WIRE -392 224 -456 224
WIRE -56 224 -72 224
WIRE -632 240 -632 224
WIRE -632 320 -632 304
WIRE -392 320 -632 320
WIRE -56 320 -72 320
WIRE -40 320 -56 320
WIRE 40 320 24 320
WIRE -232 368 -232 352
WIRE -504 400 -504 288
WIRE -56 400 -56 320
WIRE -56 400 -504 400
FLAG -232 368 0
FLAG -56 32 0
FLAG 56 -160 0
FLAG 40 -64 0
FLAG 40 320 0
FLAG -504 32 0
FLAG 24 -256 0
FLAG -888 -256 0
FLAG -584 -272 0
FLAG 872 -256 0
FLAG 888 -400 OUT
FLAG -56 128 0
FLAG -888 -368 IN
FLAG -56 224 0
FLAG -488 128 0
SYMBOL PowerProducts\\LT4180 -232 32 R0
SYMATTR InstName U1
SYMBOL res -56 -144 R270
SYMATTR InstName R1
SYMATTR Value 125.1k
SYMBOL cap -40 -80 M90
SYMATTR InstName C1
SYMATTR Value .001
SYMBOL cap 24 336 M270
SYMATTR InstName C2
SYMATTR Value 1
SYMBOL cap -648 240 R0
SYMATTR Value 220p
SYMATTR SpiceLine Rser=4K
SYMATTR SpiceLine2 Cpar=10p
SYMATTR InstName C3
SYMBOL res -184 -352 R270
SYMATTR InstName R2
SYMATTR Value 250m
SYMBOL res -520 -368 R0
SYMATTR InstName R3
SYMATTR Value 64.9K
SYMBOL res -520 -272 R0
SYMATTR InstName R4
SYMATTR Value 3.74K
SYMBOL res -520 -176 R0
SYMATTR InstName R5
SYMATTR Value 2.2K
SYMBOL res -520 -80 R0
SYMATTR InstName R6
SYMATTR Value 5.36K
SYMBOL res 168 -384 R90
SYMATTR InstName R7
SYMATTR Value 4
SYMBOL res 168 -272 R90
SYMATTR InstName R8
SYMATTR Value 4
SYMBOL cap 216 -352 R0
SYMATTR InstName C4
SYMATTR Value 100
SYMBOL npn -552 288 R270
SYMATTR InstName Q1
SYMATTR Value 2N2222
SYMBOL nmos -712 -320 R270
SYMATTR InstName Q2
SYMATTR Value Si4886DY
SYMBOL voltage -888 -368 R0
SYMATTR InstName V1
SYMATTR Value 20
SYMBOL res -648 -64 R0
SYMATTR InstName R9
SYMATTR Value 10K
SYMBOL res -760 -208 R270
SYMATTR InstName R10
SYMATTR Value 27K
SYMBOL cap -600 -352 R0
SYMATTR Value 1
SYMATTR InstName C5
SYMBOL e 872 -368 R0
SYMATTR InstName E1
SYMATTR Value 1
SYMBOL cap -408 112 R90
SYMATTR InstName C6
SYMATTR Value .1
SYMBOL current 344 -352 R0
SYMATTR Value PULSE(40m 400m 40m 2m 2m 18m 40m)
SYMATTR SpiceLine load
SYMATTR InstName LoadCurrent