* SPICE netlist
R2 N009 0 10K
R3 OUT N011 20K
R4 N011 0 10K
R1 N008 OUT .006
C4 VC N009 330p
C2 N012 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 N012 S/S VC N004 0 N013 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 N011 N013 SINE(0 50m 100)
G1 0 X N011 0 1m
R5 X 0 1K
C7 X 0 .05
G2 0 IN N013 0 1m
R7 IN 0 1K
C8 IN 0 .05
.tran 0 22.5m 2.5m
.ic V(out)=2.4
.options maxstep=25n
.save V(in) V(x)

* LTspice schematic (.asc)
Version 3
SHEET 1 488 228
WIRE -148 66 -148 58
WIRE -92 66 -92 58
WIRE -176 -74 -184 -74
WIRE -236 -10 -244 -10
WIRE 160 38 160 30
WIRE 244 38 244 14
WIRE 192 38 192 14
WIRE -224 -70 -224 -82
WIRE 8 -2 8 -6
WIRE -200 22 -212 22
WIRE -184 -42 -196 -42
WIRE -176 -42 -184 -42
WIRE 136 26 -64 26
WIRE 136 -34 136 26
WIRE 132 -34 136 -34
WIRE 160 -34 136 -34
WIRE 160 -18 160 -34
WIRE 192 -34 160 -34
WIRE 192 -2 192 -34
WIRE 244 -6 244 -34
WIRE 8 -78 8 -114
WIRE -224 -114 -156 -114
WIRE -224 -102 -224 -114
WIRE -184 -10 -196 -10
WIRE -176 -10 -184 -10
WIRE -16 -106 -52 -106
WIRE -176 22 -184 22
WIRE 108 10 -64 10
WIRE 108 -34 108 10
WIRE 96 -34 108 -34
WIRE 112 -34 108 -34
WIRE 148 42 60 42
WIRE 148 6 148 42
WIRE 160 6 148 6
WIRE 160 10 160 6
WIRE 160 2 160 6
WIRE 8 -30 8 -34
WIRE 8 -54 8 -34
WIRE -4 -10 -64 -10
WIRE -4 -58 -64 -58
WIRE -16 -106 -16 -102
WIRE -16 -86 -16 -82
WIRE 56 -34 56 -26
WIRE 56 -10 56 -2
WIRE -156 -94 -156 -114
WIRE -64 -34 -52 -34
WIRE 76 -34 56 -34
WIRE 56 -34 8 -34
WIRE -64 -74 -52 -74
WIRE -52 -74 -52 -54
WIRE -52 -38 -52 -34
WIRE -52 -34 8 -34
WIRE -84 -94 -84 -106
WIRE -84 -106 -52 -106
WIRE -52 -106 -52 -94
WIRE -52 -78 -52 -74
WIRE -120 -94 -120 -102
WIRE -212 -42 -244 -42
WIRE -212 -10 -216 -10
WIRE -156 -114 8 -114
WIRE -20 42 -48 42
WIRE 192 -34 244 -34
WIRE 60 42 60 86
WIRE 60 98 60 114
WIRE 72 114 72 102
WIRE 72 82 72 74
WIRE 72 74 96 74
WIRE 96 74 96 82
WIRE 96 102 96 114
WIRE 96 74 124 74
WIRE 124 74 124 86
WIRE 124 102 124 114
WIRE -48 42 -48 86
WIRE -48 98 -48 114
WIRE -36 114 -36 102
WIRE -36 82 -36 74
WIRE -36 74 -12 74
WIRE -12 74 -12 82
WIRE -12 102 -12 114
WIRE -12 74 16 74
WIRE 16 74 16 86
WIRE 16 102 16 114
WIRE -48 42 -64 42
WIRE 60 42 0 42
FLAG -148 66 GND
FLAG -92 66 GND
FLAG -244 -10 GND
FLAG -244 -42 GND
FLAG 160 38 GND
FLAG 244 38 GND
FLAG 192 38 GND
FLAG -224 -70 GND
FLAG 8 -2 GND
FLAG -212 22 GND
FLAG -184 -42 S/S
FLAG 192 -34 OUT
FLAG -184 -10 VC
FLAG -16 -82 GND
FLAG 56 -2 GND
FLAG 96 114 GND
FLAG 72 114 GND
FLAG 60 114 GND
FLAG 124 114 GND
FLAG -12 114 GND
FLAG -36 114 GND
FLAG -48 114 GND
FLAG 16 114 GND
FLAG 16 74 IN
FLAG 124 74 X
SYMBOL RES -212 -14 R90
SYMATTR InstName R2
SYMATTR Value 10K
SYMBOL res 156 -22 R0
SYMATTR InstName R3
SYMATTR Value 20K
SYMBOL res 156 6 R0
SYMATTR InstName R4
SYMATTR Value 10K
SYMBOL res 108 -38 M90
SYMATTR InstName R1
SYMATTR Value .006
SYMBOL cap -196 -14 R90
SYMATTR InstName C4
SYMATTR Value 330p
SYMBOL cap -184 18 R90
SYMATTR InstName C2
SYMATTR Value 43p
SYMBOL cap -196 -46 R90
SYMATTR InstName C3
SYMATTR Value .001U
SYMBOL polcap 188 -2 R0
SYMATTR InstName C6
SYMATTR Value 180U
SYMATTR Value2 x4
SYMATTR SpiceLine Rser=.05
SYMBOL VOLTAGE -224 -106 R0
SYMATTR InstName V1
SYMATTR Value 6
SYMBOL ind 72 -30 R270
SYMATTR InstName L1
SYMATTR Value 1.5U
SYMBOL NMOS -4 -78 R0
SYMATTR InstName M1
SYMATTR Value Si4410DY
SYMBOL nmos -4 -30 R0
SYMATTR InstName M2
SYMATTR Value Si4410DY
SYMBOL cap -20 -102 R0
SYMATTR InstName C1
SYMATTR Value 4.7U
SYMBOL cap -56 -54 R0
SYMATTR InstName C5
SYMATTR Value .22U
SYMBOL schottky -56 -94 R0
SYMATTR InstName D1
SYMATTR Value 1N5818
SYMBOL schottky 52 -10 M180
SYMATTR InstName D2
SYMATTR Value 1N5818
SYMBOL POWERPRODUCTS\LTC1735 -120 -26 R0
SYMATTR InstName U1
SYMATTR Value LTC1735
SYMBOL res 240 -10 R0
SYMATTR InstName R6
SYMATTR Value .5
SYMBOL voltage 4 42 R90
SYMATTR InstName V2
SYMATTR Value SINE(0 50m 100)
SYMBOL g 72 78 R0
SYMATTR InstName G1
SYMATTR Value 1m
SYMBOL res 92 78 R0
SYMATTR InstName R5
SYMATTR Value 1K
SYMBOL cap 120 86 R0
SYMATTR InstName C7
SYMATTR Value .05U
SYMBOL g -36 78 R0
SYMATTR InstName G2
SYMATTR Value 1m
SYMBOL res -16 78 R0
SYMATTR InstName R7
SYMATTR Value 1K
SYMBOL cap 12 86 R0
SYMATTR InstName C8
SYMATTR Value .05U
text 544 230 Left 0 !.ic V(out)=2.4
text 514 208 Left 0 !.options maxstep=25n
text 642 232 Left 0 ;50db 167deg
text 494 186 Left 0 !.save V(in) V(x)