* SPICE netlist
V1 IN 0 PWL(0 0 1m 24)
R1 OUT N003 806K
MQ1 IN N001 N002 N002 IRF1310
R2 IN N001 100K
D1 N002 N005 1N4148
C1 N005 N007 .1
C2 N002 0 1
L1 IN N007 10 Rser=10m
D2 N007 OUT MBRS1100
R3 OUT N014 30.9K
R4 N014 0 499
C3 OUT 0 500 Rser=10m
C4 N012 N014 330p Rser=300K Cpar=150p
C5 N010 0 1000p
MQ2 N007 N013 0 0 Si7850DP m=2
XU1 N003 MP_01 MP_02 N004 N002 NC_03 N008 N012 N014 N011 N010 0 N009 N002 N001 0 N002 N002 N013 0 0 MP_04 MP_05 MP_06 N007 N007 N006 N005 LTC3813 ;pnba Ioff)))Voff)Vrng)Pgood)SYNC)Ith)FB)PLL/LPF)SS)SGND)_SHDN)UVIN)NDRV)EXTVcc)INTVcc)DRVcc)BG)BGRTN)Sense-))))Sense+)SW)TG)Boost
MQ3 OUT N006 N007 N007 Si7850DP
V2 N009 0 PWL(1m 0 1.01m 2)
R5 IN N004 143K
R6 N004 0 10K
V3 N008 0 SINE(1 1 250K)
C7 N011 0 .01 Rser=10K
Rload OUT 0 10
.tran 5m

* LTspice schematic (.asc)
Version 4
SHEET 1 1472 1120
WIRE 576 -560 -288 -560
WIRE -496 -544 -736 -544
WIRE -64 -544 -496 -544
WIRE 208 -544 -64 -544
WIRE 320 -544 208 -544
WIRE -736 -528 -736 -544
WIRE -64 -528 -64 -544
WIRE -496 -512 -496 -544
WIRE -288 -512 -288 -560
WIRE 208 -512 208 -544
WIRE -736 -432 -736 -448
WIRE -64 -432 -64 -448
WIRE 160 -432 -64 -432
WIRE -176 -400 -416 -400
WIRE 208 -400 208 -416
WIRE 208 -400 -176 -400
WIRE -288 -384 -288 -432
WIRE -176 -384 -176 -400
WIRE -64 -384 -64 -432
WIRE 320 -352 320 -544
WIRE -496 -320 -496 -432
WIRE -400 -320 -496 -320
WIRE 80 -320 48 -320
WIRE 112 -320 80 -320
WIRE 208 -320 208 -400
WIRE 208 -320 176 -320
WIRE -496 -304 -496 -320
WIRE 384 -224 48 -224
WIRE -496 -208 -496 -224
WIRE 80 -208 80 -320
WIRE 384 -176 384 -224
WIRE -416 -128 -416 -400
WIRE -400 -128 -416 -128
WIRE 80 -128 80 -144
WIRE 80 -128 48 -128
WIRE 320 -128 320 -272
WIRE 320 -128 80 -128
WIRE 336 -128 320 -128
WIRE 368 -128 336 -128
WIRE 496 -128 464 -128
WIRE 528 -128 496 -128
WIRE 576 -128 576 -560
WIRE 576 -128 528 -128
WIRE 736 -128 576 -128
WIRE 576 -112 576 -128
WIRE 736 -112 736 -128
WIRE -528 -32 -544 -32
WIRE -400 -32 -448 -32
WIRE 80 -32 48 -32
WIRE 208 -32 208 -320
WIRE 208 -32 80 -32
WIRE 336 -32 336 -128
WIRE 384 -32 336 -32
WIRE 496 -32 496 -128
WIRE 496 -32 448 -32
WIRE 208 -16 208 -32
WIRE 576 -16 576 -48
WIRE 736 -16 736 -32
WIRE -528 64 -544 64
WIRE -400 64 -448 64
WIRE 80 64 80 -32
WIRE 80 64 48 64
WIRE 208 64 208 48
WIRE -496 160 -528 160
WIRE -400 160 -432 160
WIRE 80 160 48 160
WIRE -512 256 -544 256
WIRE -400 256 -448 256
WIRE 320 256 320 -128
WIRE 320 256 48 256
WIRE 320 272 320 256
WIRE 528 288 528 -128
WIRE -400 352 -432 352
WIRE 272 352 48 352
WIRE -432 368 -432 352
WIRE 528 400 528 368
WIRE 528 400 432 400
WIRE 528 416 528 400
WIRE -432 448 -432 432
WIRE -400 448 -432 448
WIRE 320 448 320 368
WIRE 320 448 48 448
WIRE 320 464 320 448
WIRE -288 528 -288 512
WIRE -64 528 -64 512
WIRE 528 528 528 496
WIRE -432 560 -432 448
WIRE 432 560 432 400
WIRE 432 560 -432 560
FLAG 320 464 0
FLAG 208 64 0
FLAG -64 528 0
FLAG -288 528 0
FLAG 528 528 0
FLAG 576 -16 0
FLAG 736 -16 0
FLAG -528 160 0
FLAG -736 -432 0
FLAG 736 -128 OUT
FLAG -736 -544 IN
FLAG -544 64 0
FLAG 80 160 0
FLAG -496 -208 0
FLAG -544 -32 0
FLAG -544 256 0
SYMBOL voltage -736 -544 R0
SYMATTR InstName V1
SYMATTR Value PWL(0 0 1m 24)
SYMBOL res -304 -528 R0
SYMATTR InstName R1
SYMATTR Value 806K
SYMBOL nmos 160 -512 R0
SYMATTR InstName Q1
SYMATTR Value IRF1310
SYMBOL res -80 -544 R0
SYMATTR InstName R2
SYMATTR Value 100K
SYMBOL diode 176 -336 R90
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL cap 64 -208 R0
SYMATTR InstName C1
SYMATTR Value .1
SYMBOL cap 192 -16 R0
SYMATTR InstName C2
SYMATTR Value 1
SYMBOL ind 304 -368 R0
SYMATTR InstName L1
SYMATTR Value 10
SYMATTR SpiceLine Rser=10m
SYMBOL schottky 384 -48 M90
SYMATTR InstName D2
SYMATTR Value MBRS1100
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 512 272 R0
SYMATTR InstName R3
SYMATTR Value 30.9K
SYMBOL res 512 400 R0
SYMATTR InstName R4
SYMATTR Value 499
SYMBOL cap 560 -112 R0
SYMATTR SpiceLine Rser=10m
SYMATTR Value 500
SYMATTR InstName C3
SYMBOL cap -416 368 M0
SYMATTR SpiceLine Rser=300K
SYMATTR SpiceLine2 Cpar=150p
SYMATTR InstName C4
SYMATTR Value 330p
SYMBOL cap -432 144 R90
SYMATTR InstName C5
SYMATTR Value 1000p
SYMBOL nmos 272 272 R0
SYMATTR Value Si7850DP
SYMATTR InstName Q2
SYMATTR Value2 m=2
SYMBOL PowerProducts\\LTC3813 -176 64 R0
SYMATTR InstName U1
SYMBOL nmos 464 -176 R90
SYMATTR InstName Q3
SYMATTR Value Si7850DP
SYMBOL voltage -432 64 R90
SYMATTR InstName V2
SYMATTR Value PWL(1m 0 1.01m 2)
SYMBOL res -512 -528 R0
SYMATTR InstName R5
SYMATTR Value 143K
SYMBOL res -512 -320 R0
SYMATTR InstName R6
SYMATTR Value 10K
SYMBOL voltage -432 -32 R90
SYMATTR InstName V3
SYMATTR Value SINE(1 1 250K)
SYMBOL cap -448 240 R90
SYMATTR InstName C7
SYMATTR Value .01
SYMATTR SpiceLine Rser=10K
SYMBOL res 720 -128 R0
SYMATTR InstName Rload
SYMATTR Value 10