* 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 ;pnba Run/SS)Sense1+)Sense1-)EAIN)PLLFLT)PLLIN))Ith)SGND)DiffOut)OS-)OS+)Sense2-)Sense2+)AttenOut)AttenIn)VID0)VID1)VID2)VID3)VID4)Vbias)AmpMode)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 1904 1120
WIRE -440 -560 -648 -560
WIRE 376 -560 -440 -560
WIRE 456 -560 376 -560
WIRE -648 -544 -648 -560
WIRE -120 -544 -280 -544
WIRE 8 -544 -120 -544
WIRE 104 -544 8 -544
WIRE 216 -544 104 -544
WIRE 8 -528 8 -544
WIRE 104 -528 104 -544
WIRE 216 -528 216 -544
WIRE 456 -496 456 -560
WIRE -440 -480 -440 -560
WIRE -280 -480 -280 -544
WIRE -120 -480 -120 -544
WIRE -648 -448 -648 -464
WIRE 8 -448 8 -464
WIRE -536 -416 -552 -416
WIRE 408 -416 -24 -416
WIRE -920 -352 -952 -352
WIRE -536 -352 -840 -352
WIRE 104 -352 104 -464
WIRE 104 -352 -24 -352
WIRE 456 -352 456 -400
WIRE 456 -352 296 -352
WIRE 536 -352 456 -352
WIRE 632 -352 536 -352
WIRE 728 -352 712 -352
WIRE 744 -352 728 -352
WIRE 840 -352 824 -352
WIRE 904 -352 840 -352
WIRE 952 -352 904 -352
WIRE 536 -336 536 -352
WIRE 952 -336 952 -352
WIRE 456 -304 456 -352
WIRE -744 -288 -760 -288
WIRE -616 -288 -664 -288
WIRE -536 -288 -552 -288
WIRE 104 -288 -24 -288
WIRE 296 -288 296 -352
WIRE 296 -288 104 -288
WIRE 536 -256 536 -272
WIRE 952 -240 952 -256
WIRE -680 -224 -760 -224
WIRE -536 -224 -616 -224
WIRE 408 -224 -24 -224
WIRE 456 -192 456 -208
WIRE -744 -160 -760 -160
WIRE -632 -160 -664 -160
WIRE -536 -160 -568 -160
WIRE 728 -160 728 -352
WIRE 728 -160 -24 -160
WIRE -536 -96 -552 -96
WIRE 840 -96 840 -352
WIRE 840 -96 -24 -96
WIRE 376 -48 376 -560
WIRE -536 -32 -552 -32
WIRE -552 32 -552 -32
WIRE -536 32 -552 32
WIRE 328 32 -24 32
WIRE -536 96 -552 96
WIRE 216 96 216 -464
WIRE 216 96 -24 96
WIRE 376 96 376 48
WIRE 376 96 312 96
WIRE 456 96 376 96
WIRE 568 96 456 96
WIRE 664 96 648 96
WIRE 680 96 664 96
WIRE 776 96 760 96
WIRE 904 96 904 -352
WIRE 904 96 776 96
WIRE 456 112 456 96
WIRE 904 128 904 96
WIRE 904 128 840 128
WIRE 376 144 376 96
WIRE 904 144 904 128
WIRE -552 160 -552 96
WIRE -536 160 -552 160
WIRE 216 160 -24 160
WIRE 312 160 312 96
WIRE 312 160 216 160
WIRE 456 192 456 176
WIRE -536 224 -552 224
WIRE 328 224 -24 224
WIRE 904 224 904 208
WIRE 904 224 872 224
WIRE 376 256 376 240
WIRE 904 256 904 224
WIRE -536 288 -552 288
WIRE 664 288 664 96
WIRE 664 288 -24 288
WIRE -536 352 -552 352
WIRE 776 352 776 96
WIRE 776 352 -24 352
WIRE -536 416 -552 416
WIRE 840 416 840 128
WIRE 840 416 -24 416
WIRE -536 480 -552 480
WIRE 872 480 872 224
WIRE 872 480 -24 480
WIRE -392 560 -392 544
WIRE -168 560 -168 544
FLAG 456 -192 0
FLAG 536 -256 0
FLAG 376 256 0
FLAG 456 192 0
FLAG -168 560 0
FLAG -392 560 0
FLAG 904 256 0
FLAG -760 -160 0
FLAG -760 -224 0
FLAG -648 -448 0
FLAG 952 -240 0
FLAG -952 -352 0
FLAG -760 -288 0
FLAG 8 -448 0
FLAG -552 -96 0
FLAG 952 -352 OUT
FLAG -648 -560 IN
SYMBOL NMOS 408 -496 R0
SYMATTR InstName Q1
SYMATTR Value FDS6680A
SYMBOL polcap 88 -352 R0
SYMATTR InstName C1
SYMATTR Value .47
SYMBOL nmos 408 -304 R0
SYMATTR InstName Q2
SYMATTR Value FDS6680A
SYMBOL schottky 88 -528 R0
SYMATTR InstName D1
SYMATTR Value 1N5818
SYMBOL ind 616 -336 R270
SYMATTR InstName L1
SYMATTR Value 1
SYMBOL RES 728 -368 M90
SYMATTR InstName R1
SYMATTR Value 2m
SYMBOL schottky 520 -272 M180
SYMATTR InstName D2
SYMATTR Value 1N5818
SYMBOL nmos 328 -48 R0
SYMATTR InstName Q3
SYMATTR Value FDS6680A
SYMBOL polcap 200 96 R0
SYMATTR InstName C2
SYMATTR Value .47
SYMBOL nmos 328 144 R0
SYMATTR InstName Q4
SYMATTR Value FDS6680A
SYMBOL ind 552 112 R270
SYMATTR InstName L2
SYMATTR Value 1
SYMBOL schottky 440 176 M180
SYMATTR InstName D3
SYMATTR Value 1N5818
SYMBOL polcap 888 144 R0
SYMATTR Value2 x2
SYMATTR SpiceLine Rser=10m
SYMATTR InstName C3
SYMATTR Value 1000
SYMBOL cap -568 -176 R90
SYMATTR InstName C4
SYMATTR Value .01
SYMBOL res -648 -176 R90
SYMATTR InstName R2
SYMATTR Value 2K
SYMBOL cap -616 -240 R90
SYMATTR InstName C5
SYMATTR Value 250p
SYMBOL schottky 200 -528 R0
SYMATTR InstName D4
SYMATTR Value 1N5818
SYMBOL VOLTAGE -648 -560 R0
SYMATTR InstName V1
SYMATTR Value 6
SYMBOL RES 664 80 M90
SYMATTR InstName R3
SYMATTR Value 2m
SYMBOL res -648 -304 R90
SYMATTR InstName R4
SYMATTR Value 10K
SYMBOL cap -552 -304 R90
SYMATTR InstName C6
SYMATTR Value .01
SYMBOL polcap -8 -528 R0
SYMATTR InstName C7
SYMATTR Value 1
SYMBOL voltage -824 -352 R90
SYMATTR Value SINE(.5 .5 200K)
SYMATTR InstName V2
SYMBOL POWERPRODUCTS\\LTC1709 -280 32 R0
SYMATTR InstName U1
SYMBOL res 936 -352 R0
SYMATTR InstName Rload
SYMATTR Value .5