* SPICE netlist
R1 IN N003 274K
MQ1 IN N001 N002 N002 BSH114
R2 IN N001 100K
D1 N002 N004 1N4148
C1 N004 N007 .1
MQ2 IN N006 N007 N007 Si7850DP
MQ3 N007 N012 0 0 Si7850DP
C2 N002 0 1
L1 N007 OUT 10
D2 0 N007 MBRS1100
R3 OUT N013 14K
R4 N013 0 1K
C3 OUT 0 270 Rser=18m
C4 N011 N013 5p
C5 N008 0 1000p
XU1 MP_01 N002 N002 N005 0 N011 N013 N010 N008 MP_02 MP_03 N002 N002 N001 OUT N002 N002 N012 0 0 MP_04 MP_05 MP_06 N007 N007 N006 N004 MP_07 MP_08 MP_09 N003 MP_10 0 LTC3810-5 ;pnba )Von)Vrng)Pgood)MODE/SYNC)Ith)FB)PLL/LPF)SS/TRACK)))_SHDN)UVIN)NDRV)EXTVcc)INTVcc)DRVcc)BG)BGRTN)Sense-))))Sense+)SW)TG)Boost))))Ion))SGND
R5 N005 N002 100K
C6 N010 N009 .01
R6 N009 0 10K
C7 N011 N014 47p
R7 N013 N014 200K
V1 IN 0 42
Rload OUT 0 2
.tran 1m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1344 1104
WIRE -144 -552 -368 -552
WIRE 128 -552 -144 -552
WIRE 240 -552 128 -552
WIRE 320 -552 240 -552
WIRE -368 -536 -368 -552
WIRE -144 -536 -144 -552
WIRE 320 -536 320 -552
WIRE 128 -520 128 -552
WIRE -144 -440 -144 -456
WIRE 80 -440 -144 -440
WIRE 320 -440 320 -456
WIRE -256 -424 -592 -424
WIRE 128 -424 -256 -424
WIRE -368 -392 -368 -456
WIRE -256 -392 -256 -424
WIRE -144 -392 -144 -440
WIRE -592 -328 -592 -424
WIRE -480 -328 -592 -328
WIRE 0 -328 -32 -328
WIRE 32 -328 0 -328
WIRE 128 -328 128 -424
WIRE 128 -328 96 -328
WIRE 240 -312 240 -552
WIRE -592 -232 -592 -328
WIRE -576 -232 -592 -232
WIRE -480 -232 -496 -232
WIRE 192 -232 -32 -232
WIRE 0 -216 0 -328
WIRE -592 -136 -592 -232
WIRE -480 -136 -592 -136
WIRE 0 -136 0 -152
WIRE 0 -136 -32 -136
WIRE 240 -136 240 -216
WIRE 240 -136 0 -136
WIRE 288 -136 240 -136
WIRE 336 -136 288 -136
WIRE 448 -136 416 -136
WIRE 512 -136 448 -136
WIRE 672 -136 512 -136
WIRE 512 -120 512 -136
WIRE 672 -120 672 -136
WIRE 288 -104 288 -136
WIRE -480 -40 -496 -40
WIRE 0 -40 -32 -40
WIRE 128 -40 128 -328
WIRE 128 -40 0 -40
WIRE 128 -24 128 -40
WIRE 288 -24 288 -40
WIRE 512 -24 512 -56
WIRE 672 -24 672 -40
WIRE -592 56 -592 -136
WIRE -480 56 -592 56
WIRE 0 56 0 -40
WIRE 0 56 -32 56
WIRE 128 56 128 40
WIRE -608 152 -672 152
WIRE -480 152 -544 152
WIRE 448 152 448 -136
WIRE 448 152 -32 152
WIRE 448 232 448 152
WIRE -656 248 -672 248
WIRE -560 248 -576 248
WIRE -480 248 -496 248
WIRE 240 248 240 -136
WIRE 240 248 -32 248
WIRE 240 264 240 248
WIRE -528 344 -640 344
WIRE -480 344 -528 344
WIRE 192 344 -32 344
WIRE -640 360 -640 344
WIRE -528 360 -528 344
WIRE 448 360 448 312
WIRE 448 360 368 360
WIRE 448 408 448 360
WIRE -528 440 -528 424
WIRE -480 440 -528 440
WIRE 240 440 240 360
WIRE 240 440 -32 440
WIRE -640 456 -640 424
WIRE 240 456 240 440
WIRE 448 504 448 488
WIRE -368 520 -368 504
WIRE -144 520 -144 504
WIRE -640 552 -640 536
WIRE -528 552 -528 440
WIRE -528 552 -640 552
WIRE 368 552 368 360
WIRE 368 552 -528 552
FLAG 240 456 0
FLAG 128 56 0
FLAG 288 -24 0
FLAG -144 520 0
FLAG -368 520 0
FLAG 448 504 0
FLAG 512 -24 0
FLAG 672 -24 0
FLAG -672 152 0
FLAG 320 -440 0
FLAG 672 -136 OUT
FLAG 320 -552 IN
FLAG -672 248 0
FLAG -496 -40 0
SYMBOL res -384 -552 R0
SYMATTR InstName R1
SYMATTR Value 274K
SYMBOL nmos 80 -520 R0
SYMATTR InstName Q1
SYMATTR Value BSH114
SYMBOL res -160 -552 R0
SYMATTR InstName R2
SYMATTR Value 100K
SYMBOL diode 96 -344 R90
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL cap -16 -216 R0
SYMATTR InstName C1
SYMATTR Value .1
SYMBOL nmos 192 -312 R0
SYMATTR InstName Q2
SYMATTR Value Si7850DP
SYMBOL nmos 192 264 R0
SYMATTR InstName Q3
SYMATTR Value Si7850DP
SYMBOL cap 112 -24 R0
SYMATTR InstName C2
SYMATTR Value 1
SYMBOL ind 320 -120 R270
SYMATTR InstName L1
SYMATTR Value 10
SYMBOL schottky 272 -40 M180
SYMATTR InstName D2
SYMATTR Value MBRS1100
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 432 216 R0
SYMATTR InstName R3
SYMATTR Value 14K
SYMBOL res 432 392 R0
SYMATTR InstName R4
SYMATTR Value 1K
SYMBOL cap 496 -120 R0
SYMATTR SpiceLine Rser=18m
SYMATTR Value 270
SYMATTR InstName C3
SYMBOL cap -544 360 R0
SYMATTR InstName C4
SYMATTR Value 5p
SYMBOL cap -544 136 R90
SYMATTR InstName C5
SYMATTR Value 1000p
SYMBOL PowerProducts\\LTC3810-5 -256 56 R0
SYMATTR InstName U1
SYMBOL res -480 -248 R90
SYMATTR InstName R5
SYMATTR Value 100K
SYMBOL cap -496 232 R90
SYMATTR InstName C6
SYMATTR Value .01
SYMBOL res -560 232 R90
SYMATTR InstName R6
SYMATTR Value 10K
SYMBOL cap -656 360 R0
SYMATTR InstName C7
SYMATTR Value 47p
SYMBOL res -656 552 M180
SYMATTR InstName R7
SYMATTR Value 200K
SYMBOL voltage 320 -552 R0
SYMATTR InstName V1
SYMATTR Value 42
SYMBOL res 656 -136 R0
SYMATTR InstName Rload
SYMATTR Value 2