* SPICE netlist
XU1 N005 N002 0 N015 N006 N014 IN N013 N010 N001 N012 N008 N007 N004 N001 N009 LTC1649 ;pnba G1)PVcc1)GND)FB)_SHDN)SS)Vin)C-)C+)CPout)Comp)Imax)Ifb)Vcc)PVcc2)G2
MQ1 IN N005 N003 N003 Si4420DY
MQ2 N003 N009 0 0 Si4410DY
D1 N001 N002 1N5818
R1 N004 N001 22
R2 IN N008 22K
C1 N004 0 10
C2 N010 N013 1
L1 N003 OUT 1.2
C3 OUT 0 4700 Rser=0.06
R3 N003 N007 1K
R4 OUT N015 12.4K
R5 N015 0 12.7K
C4 N014 0 .001
C5 N012 0 220p
C6 N011 0 .01
R6 N012 N011 7.6K
V1 IN 0 3.3
C7 N003 N002 1
C8 N001 0 10
Rload OUT 0 .5
.tran 2m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1328 640
WIRE -568 -320 -664 -320
WIRE 312 -320 -568 -320
WIRE -664 -304 -664 -320
WIRE -376 -272 -472 -272
WIRE -232 -272 -376 -272
WIRE -104 -272 -232 -272
WIRE -72 -272 -104 -272
WIRE 24 -272 -8 -272
WIRE 88 -272 24 -272
WIRE 216 -272 152 -272
WIRE -472 -256 -472 -272
WIRE -376 -240 -376 -272
WIRE -664 -208 -664 -224
WIRE 312 -192 312 -320
WIRE -472 -176 -472 -192
WIRE -232 -176 -232 -272
WIRE -104 -176 -104 -272
WIRE 24 -176 24 -272
WIRE -456 -112 -488 -112
WIRE -376 -112 -376 -160
WIRE -376 -112 -392 -112
WIRE -312 -112 -376 -112
WIRE 264 -112 104 -112
WIRE -312 -48 -328 -48
WIRE 120 -48 104 -48
WIRE 216 -48 216 -272
WIRE 216 -48 200 -48
WIRE 312 -48 312 -96
WIRE 312 -48 216 -48
WIRE 360 -48 312 -48
WIRE 472 -48 440 -48
WIRE 552 -48 472 -48
WIRE 664 -48 552 -48
WIRE 312 -32 312 -48
WIRE 552 -32 552 -48
WIRE 664 -32 664 -48
WIRE -568 16 -568 -320
WIRE -488 16 -568 16
WIRE -312 16 -408 16
WIRE 200 16 104 16
WIRE 200 48 200 16
WIRE 264 48 200 48
WIRE 552 64 552 32
WIRE 664 64 664 48
WIRE -568 80 -568 16
WIRE -312 80 -568 80
WIRE 152 80 104 80
WIRE 312 80 312 64
WIRE 472 112 472 -48
WIRE -584 144 -632 144
WIRE -472 144 -504 144
WIRE -312 144 -472 144
WIRE 152 144 104 144
WIRE -632 160 -632 144
WIRE -472 160 -472 144
WIRE -312 208 -392 208
WIRE 472 208 472 192
WIRE 472 208 104 208
WIRE -392 224 -392 208
WIRE 472 224 472 208
WIRE -632 240 -632 224
WIRE -472 240 -472 224
WIRE -104 272 -104 256
WIRE -392 304 -392 288
WIRE 472 320 472 304
FLAG -104 272 0
FLAG -488 -112 0
FLAG -392 304 0
FLAG 312 80 0
FLAG 552 64 0
FLAG 472 320 0
FLAG -632 240 0
FLAG -472 240 0
FLAG -664 -208 0
FLAG -472 -176 0
FLAG 664 64 0
FLAG 664 -48 OUT
FLAG -664 -320 IN
SYMBOL POWERPRODUCTS\\LTC1649 -104 48 R0
SYMATTR InstName U1
SYMBOL NMOS 264 -192 R0
SYMATTR InstName Q1
SYMATTR Value Si4420DY
SYMBOL nmos 264 -32 R0
SYMATTR InstName Q2
SYMATTR Value Si4410DY
SYMBOL schottky -72 -256 R270
SYMATTR InstName D1
SYMATTR Value 1N5818
SYMBOL RES -392 -144 M180
SYMATTR InstName R1
SYMATTR Value 22
SYMBOL res -504 32 R270
SYMATTR InstName R2
SYMATTR Value 22K
SYMBOL polcap -392 -128 R90
SYMATTR InstName C1
SYMATTR Value 10
SYMBOL cap 136 80 R0
SYMATTR InstName C2
SYMATTR Value 1
SYMBOL ind 344 -32 R270
SYMATTR InstName L1
SYMATTR Value 1.2
SYMBOL polcap 536 -32 R0
SYMATTR SpiceLine Rser=0.06
SYMATTR InstName C3
SYMATTR Value 4700
SYMBOL res 216 -64 R90
SYMATTR InstName R3
SYMATTR Value 1K
SYMBOL res 456 96 R0
SYMATTR InstName R4
SYMATTR Value 12.4K
SYMBOL res 456 208 R0
SYMATTR InstName R5
SYMATTR Value 12.7K
SYMBOL cap -408 224 R0
SYMATTR InstName C4
SYMATTR Value .001
SYMBOL cap -488 160 R0
SYMATTR InstName C5
SYMATTR Value 220p
SYMBOL cap -648 160 R0
SYMATTR InstName C6
SYMATTR Value .01
SYMBOL res -488 128 R90
SYMATTR InstName R6
SYMATTR Value 7.6K
SYMBOL VOLTAGE -664 -320 R0
SYMATTR InstName V1
SYMATTR Value 3.3
SYMBOL cap 152 -288 R90
SYMATTR InstName C7
SYMATTR Value 1
SYMBOL polcap -488 -256 R0
SYMATTR InstName C8
SYMATTR Value 10
SYMBOL res 648 -48 R0
SYMATTR InstName Rload
SYMATTR Value .5