* SPICE netlist
MQ1 IN N003 N005 N005 FDS6680A
MQ2 N005 N011 0 0 FDS6680A
C1 N006 N005 .1
D1 N001 N006 1N5817
C2 N001 0 1
D2 0 N005 1N5817
L1 N005 N009 6.3 Rpar=10000
C3 N009 OUT1 1000p
R1 N013 0 20K
R2 N013 OUT1 105K
C4 OUT1 0 47
C5 N016 N015 220p
C6 N019 0 .002
R3 N015 0 15K
V1 IN 0 7
MQ3 IN N004 N008 N008 FDS6680A
MQ4 N008 N012 0 0 FDS6680A
C7 N007 N008 .1
D3 N001 N007 1N5817
D4 0 N008 1N5817
R4 N010 OUT2 .01
C8 N010 OUT2 1000p
R5 N014 0 20K
R6 N014 OUT2 63.4K
C9 OUT2 0 47
C10 N017 N018 220p
C11 N020 0 .002
R7 N018 0 15K
L2 N008 N010 6.3 Rpar=10000
R8 N009 OUT1 .01
R9 OUT1 N022 10K
V2 N025 0 SIN(1 1 160K)
R10 N023 N024 10K
C12 N024 0 500p
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 LTC1628-SYNC ;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 0 100
Rload1 OUT1 0 100
.tran 3.5m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1920 1360
WIRE -560 -680 -672 -680
WIRE -112 -680 -560 -680
WIRE 512 -680 -112 -680
WIRE -672 -664 -672 -680
WIRE -304 -648 -416 -648
WIRE -224 -648 -304 -648
WIRE 32 -648 -224 -648
WIRE 304 -648 32 -648
WIRE -304 -632 -304 -648
WIRE -416 -600 -416 -648
WIRE 304 -600 304 -648
WIRE -560 -584 -560 -680
WIRE -112 -584 -112 -680
WIRE 32 -584 32 -648
WIRE 176 -584 176 -600
WIRE 512 -584 512 -680
WIRE -672 -568 -672 -584
WIRE -304 -552 -304 -568
WIRE -192 -504 -512 -504
WIRE 464 -504 256 -504
WIRE -560 -408 -560 -488
WIRE -512 -408 -560 -408
WIRE -416 -408 -416 -536
WIRE -416 -408 -448 -408
WIRE -192 -408 -416 -408
WIRE 304 -408 304 -536
WIRE 304 -408 256 -408
WIRE 400 -408 304 -408
WIRE 512 -408 512 -488
WIRE 512 -408 464 -408
WIRE -784 -312 -816 -312
WIRE -672 -312 -704 -312
WIRE -560 -312 -560 -408
WIRE -560 -312 -672 -312
WIRE -192 -312 -560 -312
WIRE 512 -312 512 -408
WIRE 512 -312 256 -312
WIRE 672 -312 512 -312
WIRE 736 -312 672 -312
WIRE 864 -312 816 -312
WIRE -560 -296 -560 -312
WIRE 512 -296 512 -312
WIRE 672 -280 672 -312
WIRE -672 -264 -672 -312
WIRE -192 -216 -512 -216
WIRE 464 -216 256 -216
WIRE -560 -184 -560 -200
WIRE 512 -184 512 -200
WIRE 672 -184 672 -216
WIRE -672 -168 -672 -200
WIRE -816 -120 -816 -312
WIRE -432 -120 -816 -120
WIRE -192 -120 -432 -120
WIRE 304 -120 256 -120
WIRE 864 -120 864 -312
WIRE 864 -120 304 -120
WIRE -432 -104 -432 -120
WIRE 304 -104 304 -120
WIRE -816 -24 -816 -40
WIRE -432 -24 -432 -40
WIRE -432 -24 -816 -24
WIRE -192 -24 -432 -24
WIRE 304 -24 304 -40
WIRE 304 -24 256 -24
WIRE 864 -24 864 -40
WIRE 864 -24 304 -24
WIRE -816 72 -816 -24
WIRE -816 72 -944 72
WIRE -736 72 -816 72
WIRE -688 72 -736 72
WIRE -528 72 -608 72
WIRE -192 72 -528 72
WIRE 544 72 256 72
WIRE 704 72 544 72
WIRE 864 72 864 -24
WIRE 864 72 784 72
WIRE 960 72 864 72
WIRE -944 88 -944 72
WIRE -816 88 -816 72
WIRE -528 88 -528 72
WIRE 544 88 544 72
WIRE 960 88 960 72
WIRE 864 104 864 72
WIRE -400 168 -416 168
WIRE -304 168 -320 168
WIRE -192 168 -240 168
WIRE 288 168 256 168
WIRE 368 168 352 168
WIRE 464 168 448 168
WIRE -944 184 -944 168
WIRE -816 184 -816 152
WIRE -528 184 -528 168
WIRE 544 184 544 168
WIRE 864 184 864 168
WIRE 960 184 960 168
WIRE -736 264 -736 72
WIRE -304 264 -320 264
WIRE -192 264 -240 264
WIRE 272 264 256 264
WIRE 352 264 336 264
WIRE -224 360 -224 -648
WIRE -192 360 -224 360
WIRE 288 360 256 360
WIRE -736 472 -736 344
WIRE -192 472 -736 472
WIRE 272 472 256 472
WIRE 368 472 352 472
WIRE 448 472 432 472
WIRE 32 584 32 552
WIRE -112 600 -112 552
WIRE 176 600 176 552
WIRE 32 680 32 664
FLAG 32 680 0
FLAG 176 600 0
FLAG -304 -552 0
FLAG -560 -184 0
FLAG -672 -168 0
FLAG -320 264 0
FLAG -416 168 0
FLAG -816 184 0
FLAG -528 184 0
FLAG -944 72 OUT1
FLAG -672 -568 0
FLAG 512 -184 0
FLAG 672 -184 0
FLAG 352 264 0
FLAG 464 168 0
FLAG 864 184 0
FLAG 544 184 0
FLAG 960 72 OUT2
FLAG -944 184 0
FLAG 960 184 0
FLAG -112 600 0
FLAG 448 472 0
FLAG -672 -680 IN
SYMBOL NMOS -512 -584 M0
SYMATTR InstName Q1
SYMATTR Value FDS6680A
SYMBOL nmos -512 -296 M0
SYMATTR InstName Q2
SYMATTR Value FDS6680A
SYMBOL cap -448 -424 R90
SYMATTR InstName C1
SYMATTR Value .1
SYMBOL schottky -432 -600 R0
SYMATTR InstName D1
SYMATTR Value 1N5817
SYMBOL cap -320 -632 R0
SYMATTR InstName C2
SYMATTR Value 1
SYMBOL schottky -688 -200 M180
SYMATTR InstName D2
SYMATTR Value 1N5817
SYMBOL ind -688 -296 M270
SYMATTR InstName L1
SYMATTR Value 6.3
SYMATTR SpiceLine Rpar=10000
SYMBOL cap -448 -104 R0
SYMATTR InstName C3
SYMATTR Value 1000p
SYMBOL res -544 72 R0
SYMATTR InstName R1
SYMATTR Value 20K
SYMBOL res -592 56 R90
SYMATTR InstName R2
SYMATTR Value 105K
SYMBOL cap -832 88 R0
SYMATTR InstName C4
SYMATTR Value 47
SYMBOL cap -240 152 R90
SYMATTR InstName C5
SYMATTR Value 220p
SYMBOL cap -240 248 R90
SYMATTR InstName C6
SYMATTR Value .002
SYMBOL res -304 152 R90
SYMATTR InstName R3
SYMATTR Value 15K
SYMBOL VOLTAGE -672 -680 R0
SYMATTR InstName V1
SYMATTR Value 7
SYMBOL nmos 464 -584 R0
SYMATTR InstName Q3
SYMATTR Value FDS6680A
SYMBOL nmos 464 -296 R0
SYMATTR InstName Q4
SYMATTR Value FDS6680A
SYMBOL cap 400 -424 M90
SYMATTR InstName C7
SYMATTR Value .1
SYMBOL schottky 288 -600 R0
SYMATTR InstName D3
SYMATTR Value 1N5817
SYMBOL schottky 656 -216 M180
SYMATTR InstName D4
SYMATTR Value 1N5817
SYMBOL res 848 -136 R0
SYMATTR InstName R4
SYMATTR Value .01
SYMBOL cap 288 -104 R0
SYMATTR InstName C8
SYMATTR Value 1000p
SYMBOL res 528 72 R0
SYMATTR InstName R5
SYMATTR Value 20K
SYMBOL res 688 56 M90
SYMATTR InstName R6
SYMATTR Value 63.4K
SYMBOL cap 848 104 R0
SYMATTR InstName C9
SYMATTR Value 47
SYMBOL cap 288 184 R270
SYMATTR InstName C10
SYMATTR Value 220p
SYMBOL cap 272 280 R270
SYMATTR InstName C11
SYMATTR Value .002
SYMBOL res 352 184 R270
SYMATTR InstName R7
SYMATTR Value 15K
SYMBOL ind 720 -296 R270
SYMATTR InstName L2
SYMATTR Value 6.3
SYMATTR SpiceLine Rpar=10000
SYMBOL res -832 -136 R0
SYMATTR InstName R8
SYMATTR Value .01
SYMBOL RES -752 248 R0
SYMATTR InstName R9
SYMATTR Value 10K
SYMBOL voltage 32 568 R0
SYMATTR InstName V2
SYMATTR Value SIN(1 1 160K)
SYMBOL res 256 456 M90
SYMATTR InstName R10
SYMATTR Value 10K
SYMBOL cap 368 456 M90
SYMATTR InstName C12
SYMATTR Value 500p
SYMBOL PowerProducts\\LTC3707-SYNC 32 -120 R0
SYMATTR InstName U1
SYMBOL res 944 72 R0
SYMATTR InstName Rload2
SYMATTR Value 100
SYMBOL RES -960 72 R0
SYMATTR InstName Rload1
SYMATTR Value 100