* SPICE netlist
MQ1 N001 N007 N008 N008 BSC123N08NS3
MQ2 N008 N011 0 0 BSC123N08NS3
D1 N002 N004 MBRS140
C1 N004 N008 0.1
C2 N012 N013 47n Rser=14.7K
D2 0 N008 MBRS1100
L1 N008 N009 10 Rpar=2K
R1 N009 N003 3m
R2 N010 0 49.9K
C3 N006 0 0.002
C4 N003 0 100
D3 N003 N002 1N4148
R3 FB N003 150K
R4 0 FB 16.2K
C5 N002 0 1
XU1 N001 N005 N006 FB FB N012 0 N010 N003 N009 0 N011 N002 N008 N007 N004 0 LT3845A ;pnba Vin)_SHDN)Css)Burst_EN)FB)Vc)SYNC)Fset)Sense-)Sense+)PGND)BG)Vcc)SW)TG)Boost)SGND
R5 N031 N005 1Meg
R6 IN N019 1.1Meg
R7 N019 0 100K
C6 IN 0 1
C7 N025 0 10n
C8 N027 0 10n
R8 N031 N024 100K
R9 N031 N022 100K
MQ3 N003 N014 OUT OUT Si4427DY
MQ4 N017 N016 N015 N015 Si4427DY
R10 OUT N018 1.15Meg
R11 N018 N020 127K
R12 N020 N023 133K
R13 N017 N023 1.13Meg
C9 N031 0 1
R14 N031 N026 10K
R15 0 N026 10K
R16 0 N030 22.1K
R17 0 N029 24.9K
C10 N028 0 .01
R18 OUT N015 5m
C11 N012 0 2200p Rser=20K Cpar=100p
C12 N017 0 500
D4 0 N019 2V
XU2 N019 N005 N025 N032 N021 N027 N030 N029 N028 0 N022 N024 N031 N026 N020 N023 N017 N016 N015 OUT N018 N014 N003 N012 N013 N001 IN LTC4000 period=2 ;pnba VM)_RST)IIMON)IL)ENC)IBMON)CX)CL)TMR)GND)_FLT)_CHRG)BIAS)NTC)FBG)BFB)BAT)Bgate)CSN)CSP)OFB)Igate)IID)Ith)CC)CLN)IN
V1 IN 0 36
R19 IN N001 5m
C13 N001 0 100
Rload OUT 0 10
.tran 5m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 2128 1616
WIRE -984 -808 -1064 -808
WIRE -968 -808 -984 -808
WIRE -872 -808 -888 -808
WIRE -728 -808 -872 -808
WIRE -440 -808 -728 -808
WIRE 40 -808 -440 -808
WIRE -1064 -792 -1064 -808
WIRE -984 -792 -984 -808
WIRE -872 -792 -872 -808
WIRE -728 -792 -728 -808
WIRE -952 -760 -984 -792
WIRE -904 -760 -872 -792
WIRE -72 -760 -312 -760
WIRE 328 -760 -8 -760
WIRE -728 -712 -728 -728
WIRE -392 -712 -408 -712
WIRE -312 -712 -312 -760
WIRE -312 -712 -328 -712
WIRE -232 -712 -312 -712
WIRE -72 -712 -168 -712
WIRE -1064 -696 -1064 -712
WIRE -440 -664 -440 -808
WIRE -312 -664 -312 -712
WIRE -616 -616 -872 -616
WIRE -72 -616 -72 -712
WIRE -72 -616 -120 -616
WIRE 40 -616 40 -808
WIRE -696 -536 -728 -536
WIRE -616 -536 -632 -536
WIRE -8 -536 -120 -536
WIRE -616 -456 -664 -456
WIRE -72 -456 -72 -552
WIRE -72 -456 -120 -456
WIRE 40 -456 40 -520
WIRE 40 -456 -72 -456
WIRE 88 -456 40 -456
WIRE 136 -456 88 -456
WIRE 232 -456 216 -456
WIRE 248 -456 232 -456
WIRE 328 -456 328 -760
WIRE 376 -456 328 -456
WIRE 472 -456 376 -456
WIRE 792 -456 568 -456
WIRE 984 -456 792 -456
WIRE 1064 -456 984 -456
WIRE 376 -440 376 -456
WIRE 1064 -440 1064 -456
WIRE 88 -424 88 -456
WIRE -760 -376 -776 -376
WIRE -616 -376 -680 -376
WIRE -8 -376 -120 -376
WIRE 40 -344 40 -360
WIRE 88 -344 88 -360
WIRE 376 -344 376 -376
WIRE 1064 -344 1064 -360
WIRE -616 -296 -808 -296
WIRE 232 -296 232 -456
WIRE 232 -296 -120 -296
WIRE 792 -280 792 -456
WIRE -616 -216 -648 -216
WIRE 328 -216 328 -456
WIRE 328 -216 -120 -216
WIRE -504 -152 -504 -168
WIRE -376 -152 -376 -168
WIRE -248 -152 -248 -168
WIRE -760 -120 -776 -120
WIRE -648 -120 -648 -216
WIRE -648 -120 -680 -120
WIRE -72 -120 -648 -120
WIRE 328 -120 328 -216
WIRE 328 -120 8 -120
WIRE -808 -56 -808 -296
WIRE 152 -56 -808 -56
WIRE 216 -56 152 -56
WIRE 328 -56 280 -56
WIRE 984 -40 984 -456
WIRE 984 -40 968 -40
WIRE 936 -8 968 -40
WIRE 936 -8 632 -8
WIRE 984 -8 984 -40
WIRE 152 8 152 -56
WIRE 328 8 328 -56
WIRE 472 8 472 -456
WIRE 552 8 552 -408
WIRE 632 8 632 -8
WIRE -808 24 -808 8
WIRE 936 56 728 56
WIRE -872 72 -872 -616
WIRE -312 72 -872 72
WIRE 104 72 -312 72
WIRE 968 88 936 56
WIRE 984 88 984 72
WIRE 984 88 968 88
WIRE 984 104 984 88
WIRE -904 120 -904 -760
WIRE 104 120 -904 120
WIRE 936 120 728 120
WIRE -952 152 -952 -760
WIRE -88 152 -952 152
WIRE 40 152 -88 152
WIRE 104 152 40 152
WIRE -88 168 -88 152
WIRE 40 168 40 152
WIRE -312 200 -312 72
WIRE 984 200 728 200
WIRE 40 248 40 232
WIRE 792 248 792 -200
WIRE 792 248 728 248
WIRE -88 280 -88 248
WIRE -88 280 -184 280
WIRE 104 280 -88 280
WIRE -184 296 -184 280
WIRE -88 296 -88 280
WIRE 792 344 792 328
WIRE 792 344 728 344
WIRE 792 360 792 344
WIRE -184 392 -184 360
WIRE -88 392 -88 376
WIRE 104 392 72 392
WIRE 104 440 -200 440
WIRE 792 440 728 440
WIRE 888 440 792 440
WIRE 984 440 984 200
WIRE 984 440 968 440
WIRE 104 488 -104 488
WIRE 984 488 984 440
WIRE -200 520 -200 440
WIRE 104 536 40 536
WIRE 776 552 728 552
WIRE 872 552 776 552
WIRE 776 568 776 552
WIRE 872 568 872 552
WIRE 24 584 -24 584
WIRE 104 584 88 584
WIRE 984 584 984 552
WIRE -104 632 -104 488
WIRE 872 664 872 648
WIRE 184 680 184 664
WIRE 408 680 408 664
WIRE 472 680 472 664
WIRE 552 680 552 664
WIRE 632 680 632 664
WIRE 776 680 776 648
WIRE 776 680 632 680
WIRE 296 696 296 664
WIRE 632 696 632 680
WIRE 184 776 184 744
WIRE 408 776 408 760
WIRE 472 776 472 760
WIRE 632 776 632 760
WIRE -312 808 -312 280
WIRE -200 808 -200 600
WIRE -200 808 -312 808
WIRE -104 808 -104 712
WIRE -104 808 -200 808
WIRE 776 808 776 680
WIRE 776 808 -104 808
FLAG 40 -344 0
FLAG -376 -152 0
FLAG 376 -344 0
FLAG 1064 -344 0
FLAG 1064 -456 OUT
FLAG 88 -344 0
FLAG -504 -152 0
FLAG -728 -536 0
FLAG -776 -376 0
FLAG -776 -120 0
FLAG -408 -712 0
FLAG -88 392 0
FLAG 40 248 0
FLAG -24 536 0
FLAG -24 584 0
FLAG 984 584 0
FLAG 632 776 0
FLAG 872 664 0
FLAG -808 24 0
FLAG -1064 -696 0
FLAG -1064 -808 IN
FLAG -728 -712 0
FLAG 184 776 0
FLAG 408 776 0
FLAG 472 776 0
FLAG 552 680 0
FLAG -184 392 0
FLAG -648 -216 FB
FLAG -664 -456 FB
FLAG -248 -152 0
SYMBOL nmos -8 -616 R0
SYMATTR InstName Q1
SYMATTR Value BSC123N08NS3
SYMBOL nmos -8 -456 R0
SYMATTR InstName Q2
SYMATTR Value BSC123N08NS3
SYMBOL schottky -232 -696 R270
SYMATTR InstName D1
SYMATTR Value MBRS140
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap -88 -616 R0
SYMATTR InstName C1
SYMATTR Value 0.1
SYMBOL cap 216 -72 M90
SYMATTR InstName C2
SYMATTR Value 47n
SYMATTR SpiceLine Rser=14.7K
SYMBOL schottky 72 -360 M180
SYMATTR InstName D2
SYMATTR Value MBRS1100
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL ind 120 -440 R270
SYMATTR InstName L1
SYMATTR Value 10
SYMATTR SpiceLine Rpar=2K
SYMBOL res 232 -440 R270
SYMATTR InstName R1
SYMATTR Value 3m
SYMBOL res -664 -392 R90
SYMATTR InstName R2
SYMATTR Value 49.9K
SYMBOL cap -632 -552 R90
SYMATTR InstName C3
SYMATTR Value 0.002
SYMBOL cap 360 -440 R0
SYMATTR InstName C4
SYMATTR Value 100
SYMBOL diode -8 -776 R90
SYMATTR InstName D3
SYMATTR Value 1N4148
SYMBOL res -88 -104 R270
SYMATTR InstName R3
SYMATTR Value 150K
SYMBOL res -776 -104 R270
SYMATTR InstName R4
SYMATTR Value 16.2K
SYMBOL cap -328 -728 R90
SYMATTR InstName C5
SYMATTR Value 1
SYMBOL PowerProducts\\LT3845A -376 -424 R0
SYMATTR InstName U1
SYMBOL res -328 296 M180
SYMATTR InstName R5
SYMATTR Value 1Meg
SYMBOL res -104 152 R0
SYMATTR InstName R6
SYMATTR Value 1.1Meg
SYMBOL res -104 280 R0
SYMATTR InstName R7
SYMATTR Value 100K
SYMBOL cap 24 168 R0
SYMATTR InstName C6
SYMATTR Value 1
SYMBOL cap 40 520 R90
SYMATTR InstName C7
SYMATTR Value 10n
SYMBOL cap 88 568 R90
SYMATTR InstName C8
SYMATTR Value 10n
SYMBOL res -120 728 M180
SYMATTR InstName R8
SYMATTR Value 100K
SYMBOL res -216 616 M180
SYMATTR InstName R9
SYMATTR Value 100K
SYMBOL pmos 472 -408 R270
SYMATTR InstName Q3
SYMATTR Value Si4427DY
SYMBOL pmos 936 200 M180
SYMATTR InstName Q4
SYMATTR Value Si4427DY
SYMBOL res 776 -296 R0
SYMATTR InstName R10
SYMATTR Value 1.15Meg
SYMBOL res 776 232 R0
SYMATTR InstName R11
SYMATTR Value 127K
SYMBOL res 776 344 R0
SYMATTR InstName R12
SYMATTR Value 133K
SYMBOL res 984 424 R90
SYMATTR InstName R13
SYMATTR Value 1.13Meg
SYMBOL cap 616 696 R0
SYMATTR InstName C9
SYMATTR Value 1
SYMBOL res 760 664 M180
SYMATTR InstName R14
SYMATTR Value 10K
SYMBOL res 856 664 M180
SYMATTR InstName R15
SYMATTR Value 10K
SYMBOL res 456 776 M180
SYMATTR InstName R16
SYMATTR Value 22.1K
SYMBOL res 424 776 R180
SYMATTR InstName R17
SYMATTR Value 24.9K
SYMBOL cap 168 680 R0
SYMATTR InstName C10
SYMATTR Value .01
SYMBOL res 968 -24 R0
SYMATTR InstName R18
SYMATTR Value 5m
SYMBOL cap -824 -56 R0
SYMATTR InstName C11
SYMATTR Value 2200p
SYMATTR SpiceLine Rser=20K Cpar=100p
SYMBOL cap 968 488 R0
SYMATTR Value 500
SYMATTR InstName C12
SYMBOL diode -200 360 M180
SYMATTR InstName D4
SYMATTR Value 2V
SYMBOL LTC4000 152 312 R0
SYMATTR InstName U2
SYMATTR SpiceLine period=2
SYMBOL voltage -1064 -808 R0
SYMATTR Value 36
SYMATTR InstName V1
SYMBOL res -984 -792 R270
SYMATTR InstName R19
SYMATTR Value 5m
SYMBOL cap -744 -792 R0
SYMATTR InstName C13
SYMATTR Value 100
SYMBOL res 1048 -456 R0
SYMATTR InstName Rload
SYMATTR Value 10