* SPICE netlist
MQ1 IN N003 N005 N005 FDS6680A
MQ2 N005 N011 0 0 FDS6680A
C1 N006 N005 .1
C2 N001 0 4.7
D1 0 N005 MBRS140
L1 N005 N009 8 Rpar=2K
C3 N009 OUT1 1000p
R1 N013 0 20K
R2 N013 OUT1 105K
C4 OUT1 0 56 Rser=0.05
C5 N016 N015 220p
C6 N019 0 .0001
R3 N015 0 15K
V1 IN 0 18
MQ3 IN N004 N008 N008 FDS6680A
MQ4 N008 N012 0 0 FDS6680A
C7 N007 N008 .1
R4 N010 OUT2 .015
C8 N010 OUT2 1000p
R5 N014 0 20K
R6 N014 OUT2 280K
C9 OUT2 0 56 Rser=0.065
C10 N017 N018 220p
C11 N020 0 .0001
R7 N018 0 15K
L2 N008 N010 15 Rpar=2K
R8 N009 OUT1 .015
R9 IN N022 10K
XU1 N019 N009 OUT1 N013 N023 N025 N001 N016 0 N021 N017 N014 OUT2 N010 N020 N004 N008 N007 N012 0 N001 N002 N011 IN N006 N005 N003 N022 LTC3727 ;pnba Run/SS1)Sense1+)Sense1-)Vosense1)PLLFLTR)PLLIN)FCB)Ith1)SGND)3.3Vout)Ith2)Vosense2)Sense2-)Sense2+)Run/SS2)TG2)SW2)Boost2)BG2)PGND)INTVcc)EXTVcc)BG1)Vin)Boost1)SW1)TG1)Pgood
D2 0 N008 MBRS140
D3 N001 N006 MBRS140
D4 N001 N007 MBRS140
C12 N024 N023 .01
R10 0 N024 10K
V2 N025 0 SINE(.8 .8 300K)
Rload2 OUT2 0 2.4
Rload1 OUT1 0 1
.tran 800u startup

* LTspice schematic (.asc)
Version 4
SHEET 1 2032 1408
WIRE -728 -704 -1000 -704
WIRE -456 -704 -728 -704
WIRE -56 -704 -456 -704
WIRE 552 -704 -56 -704
WIRE -728 -688 -728 -704
WIRE -168 -688 -312 -688
WIRE 88 -688 -168 -688
WIRE 184 -688 88 -688
WIRE 360 -688 184 -688
WIRE 184 -672 184 -688
WIRE -728 -592 -728 -608
WIRE 184 -592 184 -608
WIRE -312 -576 -312 -688
WIRE 360 -576 360 -688
WIRE -456 -560 -456 -704
WIRE -56 -560 -56 -704
WIRE 88 -560 88 -688
WIRE 232 -560 232 -576
WIRE 552 -560 552 -704
WIRE -136 -480 -408 -480
WIRE 504 -480 312 -480
WIRE -1000 -400 -1000 -704
WIRE -456 -384 -456 -464
WIRE -392 -384 -456 -384
WIRE -312 -384 -312 -512
WIRE -312 -384 -328 -384
WIRE -136 -384 -312 -384
WIRE 360 -384 360 -512
WIRE 360 -384 312 -384
WIRE 440 -384 360 -384
WIRE 552 -384 552 -464
WIRE 552 -384 504 -384
WIRE -728 -288 -808 -288
WIRE -600 -288 -648 -288
WIRE -456 -288 -456 -384
WIRE -456 -288 -600 -288
WIRE -136 -288 -456 -288
WIRE 552 -288 552 -384
WIRE 552 -288 312 -288
WIRE 696 -288 552 -288
WIRE 760 -288 696 -288
WIRE 888 -288 840 -288
WIRE -456 -272 -456 -288
WIRE 552 -272 552 -288
WIRE -600 -240 -600 -288
WIRE 696 -240 696 -288
WIRE -136 -192 -408 -192
WIRE 504 -192 312 -192
WIRE 552 -160 552 -176
WIRE 696 -160 696 -176
WIRE -600 -144 -600 -176
WIRE -456 -144 -456 -176
WIRE -808 -96 -808 -288
WIRE -312 -96 -808 -96
WIRE -136 -96 -312 -96
WIRE 360 -96 312 -96
WIRE 888 -96 888 -288
WIRE 888 -96 360 -96
WIRE -312 -80 -312 -96
WIRE 360 -80 360 -96
WIRE -808 0 -808 -16
WIRE -312 0 -312 -16
WIRE -312 0 -808 0
WIRE -136 0 -312 0
WIRE 360 0 360 -16
WIRE 360 0 312 0
WIRE 888 0 888 -16
WIRE 888 0 360 0
WIRE -808 96 -808 0
WIRE -808 96 -936 96
WIRE -712 96 -808 96
WIRE -552 96 -632 96
WIRE -136 96 -552 96
WIRE 648 96 312 96
WIRE 728 96 648 96
WIRE 888 96 888 0
WIRE 888 96 808 96
WIRE 1016 96 888 96
WIRE -936 112 -936 96
WIRE -808 112 -808 96
WIRE -552 112 -552 96
WIRE 648 112 648 96
WIRE 888 112 888 96
WIRE 1016 112 1016 96
WIRE -376 192 -408 192
WIRE -264 192 -296 192
WIRE -136 192 -200 192
WIRE 344 192 312 192
WIRE 440 192 408 192
WIRE 536 192 520 192
WIRE -936 208 -936 192
WIRE -808 208 -808 176
WIRE -552 208 -552 192
WIRE 648 208 648 192
WIRE 888 208 888 176
WIRE 1016 208 1016 192
WIRE -312 288 -408 288
WIRE -136 288 -248 288
WIRE 408 288 312 288
WIRE 536 288 472 288
WIRE -168 384 -168 -688
WIRE -136 384 -168 384
WIRE 344 384 312 384
WIRE -1000 496 -1000 -320
WIRE -136 496 -1000 496
WIRE 344 496 312 496
WIRE 424 496 408 496
WIRE 536 496 504 496
WIRE -56 608 -56 576
WIRE 88 608 88 576
WIRE 232 608 232 576
WIRE 88 704 88 688
FLAG -56 608 0
FLAG 232 608 0
FLAG 184 -592 0
FLAG -456 -144 0
FLAG -600 -144 0
FLAG -408 288 0
FLAG -408 192 0
FLAG -808 208 0
FLAG -552 208 0
FLAG -936 96 OUT1
FLAG -728 -592 0
FLAG 552 -160 0
FLAG 696 -160 0
FLAG 536 288 0
FLAG 536 192 0
FLAG 888 208 0
FLAG 648 208 0
FLAG 1016 96 OUT2
FLAG -936 208 0
FLAG 1016 208 0
FLAG 536 496 0
FLAG 88 704 0
FLAG -728 -704 IN
SYMBOL NMOS -408 -560 M0
SYMATTR InstName Q1
SYMATTR Value FDS6680A
SYMBOL nmos -408 -272 M0
SYMATTR InstName Q2
SYMATTR Value FDS6680A
SYMBOL cap -328 -400 R90
SYMATTR InstName C1
SYMATTR Value .1
SYMBOL cap 168 -672 R0
SYMATTR InstName C2
SYMATTR Value 4.7
SYMBOL schottky -616 -176 M180
SYMATTR InstName D1
SYMATTR Value MBRS140
SYMBOL ind -632 -272 M270
SYMATTR InstName L1
SYMATTR Value 8
SYMATTR SpiceLine Rpar=2K
SYMBOL cap -328 -80 R0
SYMATTR InstName C3
SYMATTR Value 1000p
SYMBOL res -568 96 R0
SYMATTR InstName R1
SYMATTR Value 20K
SYMBOL res -616 80 R90
SYMATTR InstName R2
SYMATTR Value 105K
SYMBOL polcap -824 112 R0
SYMATTR SpiceLine Rser=0.05
SYMATTR InstName C4
SYMATTR Value 56
SYMBOL cap -200 176 R90
SYMATTR InstName C5
SYMATTR Value 220p
SYMBOL cap -248 272 R90
SYMATTR InstName C6
SYMATTR Value .0001
SYMBOL res -280 176 R90
SYMATTR InstName R3
SYMATTR Value 15K
SYMBOL VOLTAGE -728 -704 R0
SYMATTR InstName V1
SYMATTR Value 18
SYMBOL nmos 504 -560 R0
SYMATTR InstName Q3
SYMATTR Value FDS6680A
SYMBOL nmos 504 -272 R0
SYMATTR InstName Q4
SYMATTR Value FDS6680A
SYMBOL cap 440 -400 M90
SYMATTR InstName C7
SYMATTR Value .1
SYMBOL res 872 -112 R0
SYMATTR InstName R4
SYMATTR Value .015
SYMBOL cap 344 -80 R0
SYMATTR InstName C8
SYMATTR Value 1000p
SYMBOL res 632 96 R0
SYMATTR InstName R5
SYMATTR Value 20K
SYMBOL res 712 80 M90
SYMATTR InstName R6
SYMATTR Value 280K
SYMBOL polcap 872 112 R0
SYMATTR SpiceLine Rser=0.065
SYMATTR InstName C9
SYMATTR Value 56
SYMBOL cap 344 208 R270
SYMATTR InstName C10
SYMATTR Value 220p
SYMBOL cap 408 304 R270
SYMATTR InstName C11
SYMATTR Value .0001
SYMBOL res 424 208 R270
SYMATTR InstName R7
SYMATTR Value 15K
SYMBOL ind 744 -272 R270
SYMATTR InstName L2
SYMATTR Value 15
SYMATTR SpiceLine Rpar=2K
SYMBOL res -824 -112 R0
SYMATTR InstName R8
SYMATTR Value .015
SYMBOL RES -1016 -416 R0
SYMATTR InstName R9
SYMATTR Value 10K
SYMBOL POWERPRODUCTS\\LTC3727 88 -96 R0
SYMATTR InstName U1
SYMBOL schottky 680 -176 M180
SYMATTR InstName D2
SYMATTR Value MBRS140
SYMBOL schottky -328 -576 R0
SYMATTR InstName D3
SYMATTR Value MBRS140
SYMBOL schottky 344 -576 R0
SYMATTR InstName D4
SYMATTR Value MBRS140
SYMBOL cap 408 480 R90
SYMATTR InstName C12
SYMATTR Value .01
SYMBOL res 520 480 R90
SYMATTR InstName R10
SYMATTR Value 10K
SYMBOL voltage 88 592 R0
SYMATTR InstName V2
SYMATTR Value SINE(.8 .8 300K)
SYMBOL res 1000 96 R0
SYMATTR InstName Rload2
SYMATTR Value 2.4
SYMBOL RES -952 96 R0
SYMATTR InstName Rload1
SYMATTR Value 1