* SPICE netlist
R2 N009 0 10K
R3 OUT X 20K
R4 X 0 10K
R1 N008 OUT .006
C4 VC N009 330p
C2 N011 0 43p
C3 S/S 0 .001
C6 OUT 0 180 x4 Rser=.05
V1 N001 0 6
L1 N007 N008 1.5
M1 N001 N006 N007 N007 Si4410DY
M2 N007 N010 0 0 Si4410DY
C1 N002 0 4.7
C5 N005 N007 .22
D1 N002 N005 1N5818
D2 0 N007 1N5818
XU1 N011 S/S VC N004 0 IN OUT N008 N003 0 N010 N002 N001 N007 N005 N006 LTC1735 ;pnba Cosc)Run/SS)Ith)FCB)SGND)Vosense)Sense-)Sense+)EXTVcc)PGND)BG)INTVcc)Vin)SW)Boost)TG
R6 OUT 0 .5
V2 X IN SINE(0 10m 5K)
.tran 0 1.5m .5m
.ic V(out)=2.4
;.options maxstep=20n

* LTspice schematic (.asc)
Version 3
SHEET 1 488 200
WIRE -148 90 -148 82
WIRE -92 90 -92 82
WIRE -176 -50 -184 -50
WIRE -236 14 -244 14
WIRE 160 62 160 54
WIRE 244 62 244 38
WIRE 192 62 192 38
WIRE -224 -46 -224 -58
WIRE 8 22 8 18
WIRE -200 46 -212 46
WIRE -184 -18 -196 -18
WIRE -176 -18 -184 -18
WIRE 136 50 -64 50
WIRE 136 -10 136 50
WIRE 132 -10 136 -10
WIRE 160 -10 136 -10
WIRE 160 6 160 -10
WIRE 192 -10 160 -10
WIRE 192 22 192 -10
WIRE 244 -10 192 -10
WIRE 244 18 244 -10
WIRE 8 -54 8 -90
WIRE -224 -90 -156 -90
WIRE -224 -78 -224 -90
WIRE -184 14 -196 14
WIRE -176 14 -184 14
WIRE -16 -82 -52 -82
WIRE -176 46 -184 46
WIRE 108 34 -64 34
WIRE 108 -10 108 34
WIRE 96 -10 108 -10
WIRE 112 -10 108 -10
WIRE 148 66 16 66
WIRE 148 30 148 66
WIRE 160 30 148 30
WIRE 160 34 160 30
WIRE 160 26 160 30
WIRE 8 -6 8 -10
WIRE 8 -30 8 -10
WIRE -4 14 -64 14
WIRE -4 -34 -64 -34
WIRE -16 -82 -16 -78
WIRE -16 -62 -16 -58
WIRE 56 -10 56 -2
WIRE 56 14 56 22
WIRE -156 -70 -156 -90
WIRE -64 -10 -52 -10
WIRE 76 -10 56 -10
WIRE 56 -10 8 -10
WIRE -64 -50 -52 -50
WIRE -52 -50 -52 -30
WIRE -52 -14 -52 -10
WIRE -52 -10 8 -10
WIRE -84 -70 -84 -82
WIRE -84 -82 -52 -82
WIRE -52 -82 -52 -70
WIRE -52 -54 -52 -50
WIRE -120 -70 -120 -78
WIRE -212 -18 -244 -18
WIRE -212 14 -216 14
WIRE -156 -90 8 -90
WIRE -20 66 -40 66
WIRE -40 66 -64 66
WIRE 16 66 0 66
FLAG -148 90 GND
FLAG -92 90 GND
FLAG -244 14 GND
FLAG -244 -18 GND
FLAG 160 62 GND
FLAG 244 62 GND
FLAG 192 62 GND
FLAG -224 -46 GND
FLAG 8 22 GND
FLAG -212 46 GND
FLAG -184 -18 S/S
FLAG 192 -10 OUT
FLAG -184 14 VC
FLAG -16 -58 GND
FLAG 56 22 GND
FLAG -40 66 IN
FLAG 16 66 X
SYMBOL RES -212 10 R90
SYMATTR InstName R2
SYMATTR Value 10K
SYMBOL res 156 2 R0
SYMATTR InstName R3
SYMATTR Value 20K
SYMBOL res 156 30 R0
SYMATTR InstName R4
SYMATTR Value 10K
SYMBOL res 108 -14 M90
SYMATTR InstName R1
SYMATTR Value .006
SYMBOL cap -196 10 R90
SYMATTR InstName C4
SYMATTR Value 330p
SYMBOL cap -184 42 R90
SYMATTR InstName C2
SYMATTR Value 43p
SYMBOL cap -196 -22 R90
SYMATTR InstName C3
SYMATTR Value .001U
SYMBOL polcap 188 22 R0
SYMATTR InstName C6
SYMATTR Value 180U
SYMATTR Value2 x4
SYMATTR SpiceLine Rser=.05
SYMBOL VOLTAGE -224 -82 R0
SYMATTR InstName V1
SYMATTR Value 6
SYMBOL ind 72 -6 R270
SYMATTR InstName L1
SYMATTR Value 1.5U
SYMBOL NMOS -4 -54 R0
SYMATTR InstName M1
SYMATTR Value Si4410DY
SYMBOL nmos -4 -6 R0
SYMATTR InstName M2
SYMATTR Value Si4410DY
SYMBOL cap -20 -78 R0
SYMATTR InstName C1
SYMATTR Value 4.7U
SYMBOL cap -56 -30 R0
SYMATTR InstName C5
SYMATTR Value .22U
SYMBOL schottky -56 -70 R0
SYMATTR InstName D1
SYMATTR Value 1N5818
SYMBOL schottky 52 14 M180
SYMATTR InstName D2
SYMATTR Value 1N5818
SYMBOL POWERPRODUCTS\LTC1735 -120 -2 R0
SYMATTR InstName U1
SYMATTR Value LTC1735
SYMBOL res 240 14 R0
SYMATTR InstName R6
SYMATTR Value .5
SYMBOL voltage 4 66 R90
SYMATTR InstName V2
SYMATTR Value SINE(0 10m 5K)
text 544 230 Left 0 !.ic V(out)=2.4
text 514 208 Left 0 !;.options maxstep=20n
text 642 232 Left 0 ;20.5db 40.8deg
text 398 368 Left 0 ;plot V(x)/V(in)