* SPICE netlist
MQ1 IN N003 N006 N006 FDS6680A
C1 N005 N006 .47
MQ2 N006 N011 0 0 FDS6680A
D1 N001 N005 1N5818
L1 N006 N007 1
R1 N007 OUT 2m
D2 0 N006 1N5818
MQ3 IN N015 N018 N018 FDS6680A
C2 N017 N018 .47
MQ4 N018 N021 0 0 FDS6680A
L2 N018 N019 1
D3 0 N018 1N5818
C3 OUT 0 1000 x2 Rser=10m
C4 N013 N012 .01
R2 N012 0 2K
C5 N010 0 250p
D4 N001 N017 1N5818
V1 IN 0 6
R3 N019 OUT 2m
R4 N008 0 10K
C6 N009 N008 .01
C7 N001 0 1
V2 N004 0 SINE(.5 .5 200K)
XU1 N010 N007 OUT N014 N009 N004 MP_01 N013 0 N016 0 OUT OUT N019 N014 N016 N020 N022 N023 N024 N025 N001 0 N015 N018 N017 N021 0 N001 N002 N011 IN N005 N006 N003 LTC1709-85 ;pnba Run/SS)Sense1+)Sense1-)EAIN)PLLFLT)PLLIN))Ith)SGND)DiffOut)OS-)OS+)Sense2-)Sense2+)AttenOut)AttenIn)VID25mV)VID0)VID1)VID2)VID3)Vbias)Pgood)TG2)SW2)Boost2)BG2)PGND)INTVcc)EXTVcc)BG1)Vin)Boost1)SW1)TG1
Rload OUT 0 .5
.tran 1m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1888 1136
WIRE -448 -568 -656 -568
WIRE 368 -568 -448 -568
WIRE 448 -568 368 -568
WIRE -656 -552 -656 -568
WIRE -128 -552 -288 -552
WIRE 0 -552 -128 -552
WIRE 96 -552 0 -552
WIRE 208 -552 96 -552
WIRE 0 -520 0 -552
WIRE 96 -520 96 -552
WIRE 208 -520 208 -552
WIRE 448 -488 448 -568
WIRE -448 -472 -448 -568
WIRE -288 -472 -288 -552
WIRE -128 -472 -128 -552
WIRE -656 -456 -656 -472
WIRE 0 -440 0 -456
WIRE -544 -408 -560 -408
WIRE 400 -408 -32 -408
WIRE -912 -344 -944 -344
WIRE -544 -344 -832 -344
WIRE 96 -344 96 -456
WIRE 96 -344 -32 -344
WIRE 448 -344 448 -392
WIRE 448 -344 288 -344
WIRE 528 -344 448 -344
WIRE 624 -344 528 -344
WIRE 720 -344 704 -344
WIRE 736 -344 720 -344
WIRE 832 -344 816 -344
WIRE 896 -344 832 -344
WIRE 944 -344 896 -344
WIRE 528 -328 528 -344
WIRE 944 -328 944 -344
WIRE 448 -296 448 -344
WIRE -752 -280 -768 -280
WIRE -624 -280 -672 -280
WIRE -544 -280 -560 -280
WIRE 96 -280 -32 -280
WIRE 288 -280 288 -344
WIRE 288 -280 96 -280
WIRE 528 -248 528 -264
WIRE 944 -232 944 -248
WIRE -688 -216 -768 -216
WIRE -544 -216 -624 -216
WIRE 400 -216 -32 -216
WIRE 448 -184 448 -200
WIRE -752 -152 -768 -152
WIRE -640 -152 -672 -152
WIRE -544 -152 -576 -152
WIRE 720 -152 720 -344
WIRE 720 -152 -32 -152
WIRE -544 -88 -560 -88
WIRE 832 -88 832 -344
WIRE 832 -88 -32 -88
WIRE 368 -40 368 -568
WIRE -544 -24 -560 -24
WIRE -560 40 -560 -24
WIRE -544 40 -560 40
WIRE 320 40 -32 40
WIRE -544 104 -560 104
WIRE 208 104 208 -456
WIRE 208 104 -32 104
WIRE 368 104 368 56
WIRE 368 104 304 104
WIRE 448 104 368 104
WIRE 560 104 448 104
WIRE 656 104 640 104
WIRE 672 104 656 104
WIRE 768 104 752 104
WIRE 896 104 896 -344
WIRE 896 104 768 104
WIRE 448 120 448 104
WIRE 896 136 896 104
WIRE 896 136 832 136
WIRE 368 152 368 104
WIRE 896 152 896 136
WIRE -560 168 -560 104
WIRE -544 168 -560 168
WIRE 208 168 -32 168
WIRE 304 168 304 104
WIRE 304 168 208 168
WIRE 448 200 448 184
WIRE -544 232 -560 232
WIRE 320 232 -32 232
WIRE 896 232 896 216
WIRE 896 232 864 232
WIRE 368 264 368 248
WIRE 896 264 896 232
WIRE -544 296 -560 296
WIRE 656 296 656 104
WIRE 656 296 -32 296
WIRE -544 360 -560 360
WIRE 768 360 768 104
WIRE 768 360 -32 360
WIRE -544 424 -560 424
WIRE 832 424 832 136
WIRE 832 424 -32 424
WIRE -544 488 -560 488
WIRE 864 488 864 232
WIRE 864 488 -32 488
WIRE -400 568 -400 552
WIRE -176 568 -176 552
FLAG 448 -184 0
FLAG 528 -248 0
FLAG 368 264 0
FLAG 448 200 0
FLAG -176 568 0
FLAG -400 568 0
FLAG 896 264 0
FLAG -768 -152 0
FLAG -768 -216 0
FLAG -656 -456 0
FLAG 944 -232 0
FLAG -944 -344 0
FLAG -768 -280 0
FLAG 0 -440 0
FLAG -560 -88 0
FLAG 944 -344 OUT
FLAG -656 -568 IN
SYMBOL NMOS 400 -488 R0
SYMATTR InstName Q1
SYMATTR Value FDS6680A
SYMBOL polcap 80 -344 R0
SYMATTR InstName C1
SYMATTR Value .47
SYMBOL nmos 400 -296 R0
SYMATTR InstName Q2
SYMATTR Value FDS6680A
SYMBOL schottky 80 -520 R0
SYMATTR InstName D1
SYMATTR Value 1N5818
SYMBOL ind 608 -328 R270
SYMATTR InstName L1
SYMATTR Value 1
SYMBOL RES 720 -360 M90
SYMATTR InstName R1
SYMATTR Value 2m
SYMBOL schottky 512 -264 M180
SYMATTR InstName D2
SYMATTR Value 1N5818
SYMBOL nmos 320 -40 R0
SYMATTR InstName Q3
SYMATTR Value FDS6680A
SYMBOL polcap 192 104 R0
SYMATTR InstName C2
SYMATTR Value .47
SYMBOL nmos 320 152 R0
SYMATTR InstName Q4
SYMATTR Value FDS6680A
SYMBOL ind 544 120 R270
SYMATTR InstName L2
SYMATTR Value 1
SYMBOL schottky 432 184 M180
SYMATTR InstName D3
SYMATTR Value 1N5818
SYMBOL polcap 880 152 R0
SYMATTR Value2 x2
SYMATTR SpiceLine Rser=10m
SYMATTR InstName C3
SYMATTR Value 1000
SYMBOL cap -576 -168 R90
SYMATTR InstName C4
SYMATTR Value .01
SYMBOL res -656 -168 R90
SYMATTR InstName R2
SYMATTR Value 2K
SYMBOL cap -624 -232 R90
SYMATTR InstName C5
SYMATTR Value 250p
SYMBOL schottky 192 -520 R0
SYMATTR InstName D4
SYMATTR Value 1N5818
SYMBOL VOLTAGE -656 -568 R0
SYMATTR InstName V1
SYMATTR Value 6
SYMBOL RES 656 88 M90
SYMATTR InstName R3
SYMATTR Value 2m
SYMBOL res -656 -296 R90
SYMATTR InstName R4
SYMATTR Value 10K
SYMBOL cap -560 -296 R90
SYMATTR InstName C6
SYMATTR Value .01
SYMBOL polcap -16 -520 R0
SYMATTR InstName C7
SYMATTR Value 1
SYMBOL voltage -816 -344 R90
SYMATTR Value SINE(.5 .5 200K)
SYMATTR InstName V2
SYMBOL PowerProducts\\LTC1709-85 -288 40 R0
SYMATTR InstName U1
SYMBOL res 928 -344 R0
SYMATTR InstName Rload
SYMATTR Value .5