* SPICE netlist
MQ1 IN N001 N003 N003 FDS6680A
MQ2 N003 N007 0 0 FDS6680A
C1 N003 N004 .1
D1 IntVcc N004 1N5817
C2 IntVcc 0 4.7
L1 N003 OUT1 3.2 Rser=10m Rpar=2K
C3 N009 OUT1 .1
R1 N012 0 20K
R2 N011 N012 147K
C4 OUT1 0 47
C5 Ith1 0 470p Rser=15K
C6 ss1 0 .001n
V1 IN 0 10
MQ3 IN N002 N006 N006 FDS6680A
MQ4 N006 N008 0 0 FDS6680A
C7 N006 N005 .1
D2 IntVcc N005 1N5817
C8 N010 OUT2 .1
R3 N013 0 20K
R4 P001 N013 90.9K
C9 OUT2 0 56
L2 N006 OUT2 2.2 Rser=10m Rpar=2K
R5 OUT1 N016 20K
C10 Ith2 0 470p Rser=15K
C11 ss2 0 .001n
R6 N009 N003 2.2K
R7 N006 N010 2.2K
XU1 ss1 N009 OUT1 N012 N017 NC_01 N014 Ith1 0 N015 Ith2 N013 OUT2 N010 ss2 N002 N006 N005 N008 0 IntVcc IntVcc N007 IN N004 N003 N001 N016 NC_02 LTC3869 ;pnba TK/SS1)Sense1+)Sense1-)FB1)Freq)Mode/PLLIN)Run1)Ith1)SGND)Run2)Ith2)FB2)Sense2-)Sense2+)TK/SS2)TG2)SW2)Boost2)BG2)PGND)IntVcc)Ilim)BG1)Vin)Boost1)SW1)TG1)Pgood)ExtVcc
R8 N017 0 122K
Rload1 OUT1 0 1
Rload2 OUT2 0 .66
@1 OUT1 N011 delay=250u fstart=4k fend=128k oct=3 fcoarse=8k nmax=1 2 40k 2 41k 1 pp0=200m pp1=50m f0=12k f1=48k tavgmin=100u tsettle=100u
@2 OUT2 P001 delay=250u fstart=8k fend=256k oct=3 fcoarse=16k nmax=1 2 63k 2 64k 1 pp0=200m pp1=50m f0=22k f1=88k tavgmin=100u tsettle=100u
.ic V(ith1)=1.5 V(ith2)=1.5 V(IntVcc)=5
.fra startup
.options trtol=4

* LTspice schematic (.asc)
Version 4
SHEET 1 1504 1216
WIRE -416 -608 -544 -608
WIRE -64 -608 -416 -608
WIRE 496 -608 -64 -608
WIRE -544 -576 -544 -608
WIRE -208 -576 -256 -576
WIRE 32 -576 -208 -576
WIRE 96 -576 32 -576
WIRE 224 -576 96 -576
WIRE 352 -576 224 -576
WIRE -208 -560 -208 -576
WIRE 352 -544 352 -576
WIRE -416 -528 -416 -608
WIRE -64 -528 -64 -608
WIRE 32 -528 32 -576
WIRE 224 -528 224 -576
WIRE 496 -528 496 -608
WIRE -544 -480 -544 -496
WIRE -208 -480 -208 -496
WIRE -144 -448 -368 -448
WIRE 448 -448 304 -448
WIRE -256 -432 -256 -576
WIRE -416 -352 -416 -432
WIRE -368 -352 -416 -352
WIRE -256 -352 -256 -368
WIRE -256 -352 -304 -352
WIRE -144 -352 -256 -352
WIRE 352 -352 352 -480
WIRE 352 -352 304 -352
WIRE 384 -352 352 -352
WIRE 496 -352 496 -432
WIRE 496 -352 448 -352
WIRE -560 -256 -576 -256
WIRE -448 -256 -480 -256
WIRE -416 -256 -416 -352
WIRE -416 -256 -448 -256
WIRE -144 -256 -416 -256
WIRE 496 -256 496 -352
WIRE 496 -256 304 -256
WIRE 544 -256 496 -256
WIRE 560 -256 544 -256
WIRE 656 -256 640 -256
WIRE -416 -240 -416 -256
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WIRE -144 -160 -368 -160
WIRE 448 -160 304 -160
WIRE -416 -128 -416 -144
WIRE 496 -128 496 -144
WIRE -448 -64 -448 -256
WIRE -352 -64 -448 -64
WIRE -224 -64 -272 -64
WIRE -144 -64 -224 -64
WIRE 352 -64 304 -64
WIRE 416 -64 352 -64
WIRE 544 -64 544 -256
WIRE 544 -64 496 -64
WIRE -224 -48 -224 -64
WIRE 352 -48 352 -64
WIRE -576 32 -576 -256
WIRE -224 32 -224 16
WIRE -224 32 -576 32
WIRE -144 32 -224 32
WIRE 352 32 352 16
WIRE 352 32 304 32
WIRE 656 32 656 -256
WIRE 656 32 352 32
WIRE -624 128 -736 128
WIRE -576 128 -576 32
WIRE -576 128 -624 128
WIRE -544 128 -576 128
WIRE -464 128 -480 128
WIRE -368 128 -384 128
WIRE -144 128 -368 128
WIRE 480 128 304 128
WIRE 512 128 480 128
WIRE 656 128 656 32
WIRE 752 128 656 128
WIRE -736 144 -736 128
WIRE -576 144 -576 128
WIRE 656 144 656 128
WIRE 752 144 752 128
WIRE -368 160 -368 128
WIRE 480 160 480 128
WIRE -256 224 -272 224
WIRE -176 224 -192 224
WIRE -144 224 -176 224
WIRE 336 224 304 224
WIRE 352 224 336 224
WIRE 432 224 416 224
WIRE -736 240 -736 224
WIRE -576 240 -576 208
WIRE 656 240 656 208
WIRE 752 240 752 224
WIRE -368 256 -368 240
WIRE 480 256 480 240
WIRE -336 320 -352 320
WIRE -176 320 -272 320
WIRE -144 320 -176 320
WIRE 336 320 304 320
WIRE 416 320 336 320
WIRE 496 320 480 320
WIRE -144 416 -160 416
WIRE 320 416 304 416
WIRE -624 512 -624 128
WIRE -304 512 -624 512
WIRE -144 512 -224 512
WIRE 320 512 304 512
WIRE 416 512 400 512
WIRE -64 608 -64 592
WIRE 224 608 224 592
FLAG 224 608 0
FLAG -208 -480 0
FLAG -416 -128 0
FLAG -352 320 0
FLAG -272 224 0
FLAG -576 240 0
FLAG -368 256 0
FLAG -736 128 OUT1
FLAG -544 -480 0
FLAG 496 -128 0
FLAG 656 240 0
FLAG 480 256 0
FLAG 752 128 OUT2
FLAG -736 240 0
FLAG 752 240 0
FLAG -64 608 0
FLAG 416 512 0
FLAG -544 -608 IN
FLAG 496 320 0
FLAG 432 224 0
FLAG -176 224 Ith1
FLAG 336 224 Ith2
FLAG -176 320 ss1
FLAG 336 320 ss2
FLAG 96 -576 IntVcc
SYMBOL NMOS -368 -528 M0
SYMATTR InstName Q1
SYMATTR Value FDS6680A
SYMBOL nmos -368 -240 M0
SYMATTR InstName Q2
SYMATTR Value FDS6680A
SYMBOL cap -368 -368 M90
SYMATTR InstName C1
SYMATTR Value .1
SYMBOL schottky -272 -432 R0
SYMATTR Value 1N5817
SYMATTR InstName D1
SYMBOL cap -224 -560 R0
SYMATTR InstName C2
SYMATTR Value 4.7
SYMBOL ind -464 -240 M270
SYMATTR InstName L1
SYMATTR Value 3.2
SYMATTR SpiceLine Rser=10m Rpar=2K
SYMBOL cap -240 -48 R0
SYMATTR Value .1
SYMATTR InstName C3
SYMBOL res -384 144 R0
SYMATTR InstName R1
SYMATTR Value 20K
SYMBOL res -480 144 R270
SYMATTR InstName R2
SYMATTR Value 147K
SYMBOL cap -592 144 R0
SYMATTR InstName C4
SYMATTR Value 47
SYMBOL cap -192 208 R90
SYMATTR InstName C5
SYMATTR Value 470p
SYMATTR SpiceLine Rser=15K
SYMBOL cap -272 304 R90
SYMATTR InstName C6
SYMATTR Value .001n
SYMBOL VOLTAGE -544 -592 R0
SYMATTR InstName V1
SYMATTR Value 10
SYMBOL nmos 448 -528 R0
SYMATTR InstName Q3
SYMATTR Value FDS6680A
SYMBOL nmos 448 -240 R0
SYMATTR Value FDS6680A
SYMATTR InstName Q4
SYMBOL cap 448 -368 R90
SYMATTR InstName C7
SYMATTR Value .1
SYMBOL schottky 336 -544 R0
SYMATTR InstName D2
SYMATTR Value 1N5817
SYMBOL cap 336 -48 R0
SYMATTR InstName C8
SYMATTR Value .1
SYMBOL res 464 144 R0
SYMATTR InstName R3
SYMATTR Value 20K
SYMBOL res 608 144 M270
SYMATTR InstName R4
SYMATTR Value 90.9K
SYMBOL cap 640 144 R0
SYMATTR InstName C9
SYMATTR Value 56
SYMBOL ind 544 -240 R270
SYMATTR InstName L2
SYMATTR Value 2.2
SYMATTR SpiceLine Rser=10m Rpar=2K
SYMBOL RES -320 528 R270
SYMATTR InstName R5
SYMATTR Value 20K
SYMBOL cap 352 208 M90
SYMATTR InstName C10
SYMATTR Value 470p
SYMATTR SpiceLine Rser=15K
SYMBOL cap 416 304 M90
SYMATTR InstName C11
SYMATTR Value .001n
SYMBOL res -256 -80 R90
SYMATTR InstName R6
SYMATTR Value 2.2K
SYMBOL res 512 -80 R90
SYMATTR InstName R7
SYMATTR Value 2.2K
SYMBOL PowerProducts\\LTC3869 80 32 R0
SYMATTR InstName U1
SYMBOL res 304 528 R270
SYMATTR InstName R8
SYMATTR Value 122K
SYMBOL RES -752 128 R0
SYMATTR InstName Rload1
SYMATTR Value 1
SYMBOL res 736 128 R0
SYMATTR InstName Rload2
SYMATTR Value .66
SYMBOL fra -480 128 M90
SYMATTR InstName @1
SYMATTR SpiceLine delay=250u fstart=4k fend=128k oct=3 fcoarse=8k nmax=1 2 40k 2 41k 1 pp0=200m pp1=50m f0=12k f1=48k tavgmin=100u tsettle=100u
SYMBOL fra 592 128 M270
SYMATTR InstName @2
SYMATTR SpiceLine delay=250u fstart=8k fend=256k oct=3 fcoarse=16k nmax=1 2 63k 2 64k 1 pp0=200m pp1=50m f0=22k f1=88k tavgmin=100u tsettle=100u