* SPICE netlist
MQ1 IN N002 N004 N004 BSC059N04LS6
L1 N004 N005 0.68 Rser=1.7m
C1 OUT 0 100 m=4 Rser=5m
R1 OUT N009 215K
R2 N009 0 68.1K
C2 N003 N004 0.1
C3 N001 0 4.7
C5 N007 0 0.01
V1 IN 0 12
D1 N001 N003 CMDSH-4E
MQ2 N004 N006 0 0 BSC022N04LS6
Rload OUT 0 165m
R4 N005 OUT 1.5m
C6 OUT 0 470 Rser=18m
C4 N008 0 39p
R3 N008 N010 6.19K
C7 OUT N005 1n
XU1 OUT 0 MP_01 0 0 0 IN MP_02 MP_03 MP_04 MP_05 MP_06 MP_07 MP_08 MP_09 MP_10 MP_11 MP_12 N001 OUT MP_13 IN N006 N003 N004 N002 MP_14 MP_15 N007 N008 N009 N005 LTC7803 ;pnba SENSE-)FREQ))MODE)PLLIN/SPREAD)GND)RUN))))))))))))INTVCC)EXTVCC))VIN)BG)BOOST)SW)TG)))TRACK/SS)ITH)VFB)SENSE+
C8 N010 0 4700p
.tran 1.2m startup

* LTspice schematic (.asc)
Version 4.1
SHEET 1 1504 992
WIRE 496 -496 -272 -496
WIRE -128 -464 -672 -464
WIRE -432 -432 -576 -432
WIRE 64 -432 -432 -432
WIRE 256 -432 64 -432
WIRE 304 -432 256 -432
WIRE -128 -400 -128 -464
WIRE 64 -400 64 -432
WIRE 304 -400 304 -432
WIRE -432 -384 -432 -432
WIRE -272 -384 -272 -496
WIRE -576 -320 -576 -432
WIRE -544 -320 -576 -320
WIRE 16 -320 -160 -320
WIRE 304 -304 304 -320
WIRE -672 -224 -672 -464
WIRE -544 -224 -672 -224
WIRE -128 -224 -128 -336
WIRE -128 -224 -160 -224
WIRE -128 -208 -128 -224
WIRE -672 -176 -672 -224
WIRE -544 -128 -576 -128
WIRE -128 -128 -128 -144
WIRE -128 -128 -160 -128
WIRE 64 -128 64 -304
WIRE 64 -128 -128 -128
WIRE 160 -128 64 -128
WIRE 304 -128 240 -128
WIRE 320 -128 304 -128
WIRE 416 -128 400 -128
WIRE 464 -128 416 -128
WIRE 496 -128 496 -496
WIRE 496 -128 464 -128
WIRE 528 -128 496 -128
WIRE 640 -128 528 -128
WIRE 704 -128 640 -128
WIRE 752 -128 704 -128
WIRE 64 -112 64 -128
WIRE 752 -112 752 -128
WIRE -672 -96 -672 -112
WIRE 528 -96 528 -128
WIRE 640 -96 640 -128
WIRE -544 -32 -576 -32
WIRE 16 -32 -160 -32
WIRE 528 -16 528 -32
WIRE 640 -16 640 -32
WIRE 752 -16 752 -32
WIRE 64 0 64 -16
WIRE -544 64 -576 64
WIRE -128 64 -160 64
WIRE 304 64 304 -128
WIRE 304 64 -128 64
WIRE -128 80 -128 64
WIRE -624 160 -656 160
WIRE -544 160 -560 160
WIRE -128 160 -128 144
WIRE -128 160 -160 160
WIRE 416 160 416 -128
WIRE 416 160 -128 160
WIRE 464 160 464 -128
WIRE -640 256 -736 256
WIRE -544 256 -640 256
WIRE 464 256 464 240
WIRE 464 256 -160 256
WIRE 464 272 464 256
WIRE -640 288 -640 256
WIRE -736 304 -736 256
WIRE -352 352 -352 320
WIRE 464 368 464 352
WIRE -736 400 -736 368
WIRE -640 400 -640 368
WIRE -640 496 -640 464
FLAG 64 0 0
FLAG 528 -16 0
FLAG 752 -16 0
FLAG 464 368 0
FLAG 704 -128 OUT
FLAG -672 -96 0
FLAG -656 160 0
FLAG 304 -304 0
FLAG 256 -432 IN
FLAG -352 352 0
FLAG -576 -32 0
FLAG -576 -128 0
FLAG 640 -16 0
FLAG -640 496 0
FLAG -736 400 0
FLAG -576 64 0
SYMBOL nmos 16 -400 R0
SYMATTR InstName Q1
SYMATTR Value BSC059N04LS6
SYMBOL ind 144 -112 R270
SYMATTR InstName L1
SYMATTR Value 0.68
SYMATTR SpiceLine Rser=1.7m
SYMBOL cap 512 -96 R0
SYMATTR Value 100
SYMATTR Value2 m=4
SYMATTR InstName C1
SYMATTR SpiceLine Rser=5m
SYMBOL res 448 144 R0
SYMATTR InstName R1
SYMATTR Value 215K
SYMBOL res 448 256 R0
SYMATTR InstName R2
SYMATTR Value 68.1K
SYMBOL cap -144 -208 R0
SYMATTR InstName C2
SYMATTR Value 0.1
SYMBOL cap -688 -176 R0
SYMATTR InstName C3
SYMATTR Value 4.7
SYMBOL cap -560 144 R90
SYMATTR InstName C5
SYMATTR Value 0.01
SYMBOL voltage 304 -416 R0
SYMATTR Value 12
SYMATTR InstName V1
SYMBOL schottky -144 -400 R0
SYMATTR Value CMDSH-4E
SYMATTR InstName D1
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL nmos 16 -112 R0
SYMATTR InstName Q2
SYMATTR Value BSC022N04LS6
SYMBOL res 736 -128 R0
SYMATTR InstName Rload
SYMATTR Value 165m
SYMBOL res 304 -112 R270
SYMATTR InstName R4
SYMATTR Value 1.5m
SYMBOL cap 624 -96 R0
SYMATTR Value 470
SYMATTR InstName C6
SYMATTR SpiceLine Rser=18m
SYMBOL cap -752 304 R0
SYMATTR InstName C4
SYMATTR Value 39p
SYMBOL res -656 272 R0
SYMATTR InstName R3
SYMATTR Value 6.19K
SYMBOL cap -144 144 M180
SYMATTR InstName C7
SYMATTR Value 1n
SYMBOL LTC7803 -352 -32 R0
SYMATTR InstName U1
SYMBOL cap -656 400 R0
SYMATTR InstName C8
SYMATTR Value 4700p