* 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=10000
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
R8 N009 OUT1 .015
R9 IN N022 10K
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)
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
Rload2 OUT2 0 2.4
Rload1 OUT1 0 1
.tran 800u startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1872 1408
WIRE -744 -704 -920 -704
WIRE -472 -704 -744 -704
WIRE -72 -704 -472 -704
WIRE 536 -704 -72 -704
WIRE -744 -688 -744 -704
WIRE -184 -688 -328 -688
WIRE 72 -688 -184 -688
WIRE 168 -688 72 -688
WIRE 344 -688 168 -688
WIRE 168 -672 168 -688
WIRE -744 -592 -744 -608
WIRE 168 -592 168 -608
WIRE -328 -576 -328 -688
WIRE 344 -576 344 -688
WIRE -472 -560 -472 -704
WIRE -72 -560 -72 -704
WIRE 72 -560 72 -688
WIRE 216 -560 216 -576
WIRE 536 -560 536 -704
WIRE -152 -480 -424 -480
WIRE 488 -480 296 -480
WIRE -920 -400 -920 -704
WIRE -472 -384 -472 -464
WIRE -408 -384 -472 -384
WIRE -328 -384 -328 -512
WIRE -328 -384 -344 -384
WIRE -152 -384 -328 -384
WIRE 344 -384 344 -512
WIRE 344 -384 296 -384
WIRE 424 -384 344 -384
WIRE 536 -384 536 -464
WIRE 536 -384 488 -384
WIRE -712 -288 -728 -288
WIRE -600 -288 -632 -288
WIRE -472 -288 -472 -384
WIRE -472 -288 -600 -288
WIRE -152 -288 -472 -288
WIRE 536 -288 536 -384
WIRE 536 -288 296 -288
WIRE 680 -288 536 -288
WIRE 728 -288 680 -288
WIRE 840 -288 808 -288
WIRE -472 -272 -472 -288
WIRE 536 -272 536 -288
WIRE -600 -256 -600 -288
WIRE 680 -240 680 -288
WIRE -152 -192 -424 -192
WIRE 488 -192 296 -192
WIRE -600 -176 -600 -192
WIRE 536 -160 536 -176
WIRE 680 -160 680 -176
WIRE -472 -144 -472 -176
WIRE -728 -96 -728 -288
WIRE -280 -96 -728 -96
WIRE -152 -96 -280 -96
WIRE 344 -96 296 -96
WIRE 840 -96 840 -288
WIRE 840 -96 344 -96
WIRE -280 -80 -280 -96
WIRE 344 -80 344 -96
WIRE -728 0 -728 -16
WIRE -280 0 -280 -16
WIRE -280 0 -728 0
WIRE -152 0 -280 0
WIRE 344 0 344 -16
WIRE 344 0 296 0
WIRE 840 0 840 -16
WIRE 840 0 344 0
WIRE -728 96 -728 0
WIRE -728 96 -872 96
WIRE -680 96 -728 96
WIRE -568 96 -600 96
WIRE -152 96 -568 96
WIRE 632 96 296 96
WIRE 712 96 632 96
WIRE 840 96 840 0
WIRE 840 96 792 96
WIRE 936 96 840 96
WIRE -872 112 -872 96
WIRE -728 112 -728 96
WIRE -568 112 -568 96
WIRE 632 112 632 96
WIRE 840 112 840 96
WIRE 936 112 936 96
WIRE -392 192 -424 192
WIRE -280 192 -312 192
WIRE -152 192 -216 192
WIRE 328 192 296 192
WIRE 424 192 392 192
WIRE 520 192 504 192
WIRE -872 208 -872 192
WIRE -728 208 -728 176
WIRE -568 208 -568 192
WIRE 632 208 632 192
WIRE 840 208 840 176
WIRE 936 208 936 192
WIRE -328 288 -424 288
WIRE -152 288 -264 288
WIRE 392 288 296 288
WIRE 520 288 456 288
WIRE -184 384 -184 -688
WIRE -152 384 -184 384
WIRE 328 384 296 384
WIRE -920 496 -920 -320
WIRE -152 496 -920 496
WIRE 328 496 296 496
WIRE 408 496 392 496
WIRE 520 496 488 496
WIRE -72 608 -72 576
WIRE 72 608 72 576
WIRE 216 608 216 576
WIRE 72 704 72 688
FLAG -72 608 0
FLAG 216 608 0
FLAG 168 -592 0
FLAG -472 -144 0
FLAG -600 -176 0
FLAG -424 288 0
FLAG -424 192 0
FLAG -728 208 0
FLAG -568 208 0
FLAG -872 96 OUT1
FLAG -744 -592 0
FLAG 536 -160 0
FLAG 680 -160 0
FLAG 520 288 0
FLAG 520 192 0
FLAG 840 208 0
FLAG 632 208 0
FLAG 936 96 OUT2
FLAG -872 208 0
FLAG 936 208 0
FLAG 520 496 0
FLAG 72 704 0
FLAG -744 -704 IN
SYMBOL NMOS -424 -560 M0
SYMATTR InstName Q1
SYMATTR Value FDS6680A
SYMBOL nmos -424 -272 M0
SYMATTR InstName Q2
SYMATTR Value FDS6680A
SYMBOL cap -344 -400 R90
SYMATTR InstName C1
SYMATTR Value .1
SYMBOL cap 152 -672 R0
SYMATTR InstName C2
SYMATTR Value 4.7
SYMBOL schottky -616 -192 M180
SYMATTR InstName D1
SYMATTR Value MBRS140
SYMBOL ind -616 -272 M270
SYMATTR InstName L1
SYMATTR Value 8
SYMATTR SpiceLine Rpar=10000
SYMBOL cap -296 -80 R0
SYMATTR InstName C3
SYMATTR Value 1000p
SYMBOL res -584 96 R0
SYMATTR InstName R1
SYMATTR Value 20K
SYMBOL res -584 80 R90
SYMATTR InstName R2
SYMATTR Value 105K
SYMBOL polcap -744 112 R0
SYMATTR SpiceLine Rser=0.05
SYMATTR InstName C4
SYMATTR Value 56
SYMBOL cap -216 176 R90
SYMATTR InstName C5
SYMATTR Value 220p
SYMBOL cap -264 272 R90
SYMATTR InstName C6
SYMATTR Value .0001
SYMBOL res -296 176 R90
SYMATTR InstName R3
SYMATTR Value 15K
SYMBOL VOLTAGE -744 -704 R0
SYMATTR InstName V1
SYMATTR Value 18
SYMBOL nmos 488 -560 R0
SYMATTR InstName Q3
SYMATTR Value FDS6680A
SYMBOL nmos 488 -272 R0
SYMATTR InstName Q4
SYMATTR Value FDS6680A
SYMBOL cap 424 -400 M90
SYMATTR InstName C7
SYMATTR Value .1
SYMBOL res 824 -112 R0
SYMATTR InstName R4
SYMATTR Value .015
SYMBOL cap 328 -80 R0
SYMATTR InstName C8
SYMATTR Value 1000p
SYMBOL res 616 96 R0
SYMATTR InstName R5
SYMATTR Value 20K
SYMBOL res 696 80 M90
SYMATTR InstName R6
SYMATTR Value 280K
SYMBOL polcap 824 112 R0
SYMATTR SpiceLine Rser=0.065
SYMATTR InstName C9
SYMATTR Value 56
SYMBOL cap 328 208 R270
SYMATTR InstName C10
SYMATTR Value 220p
SYMBOL cap 392 304 R270
SYMATTR InstName C11
SYMATTR Value .0001
SYMBOL res 408 208 R270
SYMATTR InstName R7
SYMATTR Value 15K
SYMBOL ind 712 -272 R270
SYMATTR InstName L2
SYMATTR Value 15
SYMBOL res -744 -112 R0
SYMATTR InstName R8
SYMATTR Value .015
SYMBOL RES -936 -416 R0
SYMATTR InstName R9
SYMATTR Value 10K
SYMBOL schottky 664 -176 M180
SYMATTR InstName D2
SYMATTR Value MBRS140
SYMBOL schottky -344 -576 R0
SYMATTR InstName D3
SYMATTR Value MBRS140
SYMBOL schottky 328 -576 R0
SYMATTR InstName D4
SYMATTR Value MBRS140
SYMBOL cap 392 480 R90
SYMATTR InstName C12
SYMATTR Value .01
SYMBOL res 504 480 R90
SYMATTR InstName R10
SYMATTR Value 10K
SYMBOL voltage 72 592 R0
SYMATTR InstName V2
SYMATTR Value SINE(.8 .8 300K)
SYMBOL PowerProducts\\LTC3727-1 72 -96 R0
SYMATTR InstName U1
SYMBOL res 920 96 R0
SYMATTR InstName Rload2
SYMATTR Value 2.4
SYMBOL RES -888 96 R0
SYMATTR InstName Rload1
SYMATTR Value 1