* SPICE netlist
L1 N017 N022 300 Rser=.38
L2 N016 N023 1200 Rser=.91
C1 N020 N022 1
XU1 N014 N024 N013 N016 N023 0 N007 N019 0 N009 0 LTC3725 ;pnba UVLO)SSFLT)Ndrv)FB/IN+)FS/IN-)PGND)Gate)Vcc)VSLMT)IS)GND
C6 N024 0 .001
R1 N023 0 162K
R2 IN N013 100K
R3 IN N014 365K
R4 N014 0 15K
C7 N019 0 1
MQ1 IN N013 N019 N019 FDC2512
XU2 N010 N008 0 N015 N018 N021 0 0 0 N012 0 N003 0 N020 N017 N011 LTC3726 ;pnba SG)FG)Mode)FB)Ith)Run/SS)SLP)GND)FS/Sync)Is-)Is+)SW)PGND)PT-)PT+)Vcc
C8 N021 0 .001
C9 N018 0 680p Rser=20K
R5 OUT N015 110K
R6 N015 0 24.9K
V1 IN 0 36
L3 IN N005 194 Rpar=10K
MQ2 N005 N007 N009 N009 Si7540DP_N
R8 N009 0 25m
L4 N003 N006 9.58 Rpar=10K
MQ3 N003 N010 0 0 IRF6623
MQ4 N006 N008 N012 N012 IRF6623
C14 OUT 0 1000
L5 N001 0 100 Rser=2 Rpar=10K
D1 N001 N002 CMDSH2-3
C15 N002 0 10
R10 N002 N004 500
D2 0 N004 BZX84C8V2L
Q5 N002 N004 N011 0 FZT849
C16 N011 0 34
L6 N003 OUT 1.5 Rpar=1K
Rload OUT 0 .165
R9 N012 0 2m
K1 L3 L4 L5 1
K2 L1 L2 1
.tran .75m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1728 944
WIRE -112 -472 -240 -472
WIRE 48 -472 -48 -472
WIRE 544 -472 48 -472
WIRE 640 -472 544 -472
WIRE -240 -456 -240 -472
WIRE 48 -456 48 -472
WIRE 640 -424 640 -472
WIRE 48 -376 48 -392
WIRE -240 -360 -240 -376
WIRE -160 -360 -240 -360
WIRE -160 -344 -160 -360
WIRE -752 -312 -832 -312
WIRE -288 -312 -752 -312
WIRE 288 -312 -240 -312
WIRE 336 -312 288 -312
WIRE 352 -312 336 -312
WIRE 448 -312 432 -312
WIRE 816 -312 448 -312
WIRE 864 -312 816 -312
WIRE -832 -296 -832 -312
WIRE -288 -296 -288 -312
WIRE -240 -296 -240 -312
WIRE 448 -296 448 -312
WIRE 864 -296 864 -312
WIRE 544 -264 544 -472
WIRE 448 -216 448 -232
WIRE 640 -216 640 -344
WIRE 640 -216 608 -216
WIRE -832 -200 -832 -216
WIRE -288 -200 -288 -216
WIRE -288 -200 -368 -200
WIRE -240 -200 -240 -216
WIRE -160 -200 -240 -200
WIRE 640 -200 640 -216
WIRE 864 -200 864 -216
WIRE -160 -184 -160 -200
WIRE 336 -152 336 -312
WIRE -416 -120 -432 -120
WIRE 640 -120 640 -136
WIRE -752 -104 -752 -312
WIRE -752 -104 -848 -104
WIRE -576 -104 -752 -104
WIRE 160 -104 -112 -104
WIRE -576 -88 -576 -104
WIRE -368 -88 -368 -104
WIRE -288 -88 -368 -88
WIRE -752 -72 -752 -104
WIRE -368 -72 -368 -88
WIRE 416 -72 384 -72
WIRE 544 -72 544 -168
WIRE 656 -72 544 -72
WIRE -848 -56 -848 -104
WIRE -160 -56 -160 -88
WIRE 48 -56 -160 -56
WIRE 656 -56 656 -72
WIRE -160 -40 -160 -56
WIRE 160 -8 160 -104
WIRE 288 -8 288 -312
WIRE 416 -8 416 -72
WIRE 544 -8 544 -72
WIRE -576 8 -576 -8
WIRE -576 8 -704 8
WIRE -368 24 -368 8
WIRE 656 24 656 8
WIRE 816 40 816 -312
WIRE -576 56 -576 8
WIRE -432 56 -432 -120
WIRE -288 56 -288 -88
WIRE -160 56 -160 40
WIRE 16 56 -160 56
WIRE -160 72 -160 56
WIRE 48 72 48 -56
WIRE 80 72 48 72
WIRE 656 72 624 72
WIRE -848 136 -848 24
WIRE -688 136 -848 136
WIRE 16 136 16 56
WIRE 80 136 16 136
WIRE 816 136 816 120
WIRE 816 136 624 136
WIRE -848 152 -848 136
WIRE 816 152 816 136
WIRE -96 168 -192 168
WIRE 64 168 -48 168
WIRE -96 200 -96 168
WIRE -48 200 -48 168
WIRE 64 200 64 168
WIRE 80 200 64 200
WIRE 672 200 624 200
WIRE 768 200 736 200
WIRE -848 248 -848 232
WIRE -752 248 -752 24
WIRE -688 248 -752 248
WIRE 816 248 816 232
WIRE 80 264 64 264
WIRE 672 264 624 264
WIRE 672 280 672 264
WIRE -48 312 -48 280
WIRE 0 312 -48 312
WIRE 64 312 64 264
WIRE -752 328 -752 312
WIRE -96 328 -96 280
WIRE -96 328 -192 328
WIRE -96 344 -96 328
WIRE -688 360 -768 360
WIRE 672 360 672 344
WIRE -768 376 -768 360
WIRE 160 376 160 344
WIRE 288 376 288 344
WIRE 416 376 416 344
WIRE 544 376 544 344
WIRE -96 440 -96 424
WIRE -768 472 -768 440
WIRE -576 472 -576 440
WIRE -432 472 -432 440
WIRE -288 472 -288 440
FLAG -832 -200 0
FLAG -576 472 0
FLAG -432 472 0
FLAG -288 472 0
FLAG -768 472 0
FLAG -96 440 0
FLAG -848 248 0
FLAG -752 328 0
FLAG 160 376 0
FLAG 288 376 0
FLAG 544 376 0
FLAG 672 360 0
FLAG 768 200 0
FLAG 816 248 0
FLAG 656 72 0
FLAG 416 376 0
FLAG -368 24 0
FLAG -160 72 0
FLAG 336 -56 0
FLAG 448 -216 0
FLAG 864 -200 0
FLAG -160 -344 0
FLAG 48 -376 0
FLAG 640 -120 0
FLAG 656 24 0
FLAG -832 -312 IN
FLAG 864 -312 OUT
SYMBOL ind2 -32 184 M0
SYMATTR InstName L1
SYMATTR Value 300
SYMATTR Type ind
SYMATTR SpiceLine Rser=.38
SYMBOL ind2 -112 184 R0
SYMATTR InstName L2
SYMATTR Value 1200
SYMATTR Type ind
SYMATTR SpiceLine Rser=.91
SYMBOL cap 64 296 R90
SYMATTR InstName C1
SYMATTR Value 1
SYMBOL PowerProducts\\LTC3725 -432 248 R0
SYMATTR InstName U1
SYMBOL cap -784 376 R0
SYMATTR InstName C6
SYMATTR Value .001
SYMBOL res -112 328 R0
SYMATTR InstName R1
SYMATTR Value 162K
SYMBOL res -592 -104 R0
SYMATTR InstName R2
SYMATTR Value 100K
SYMBOL res -864 -72 R0
SYMATTR InstName R3
SYMATTR Value 365K
SYMBOL res -864 136 R0
SYMATTR Value 15K
SYMATTR InstName R4
SYMBOL cap -768 248 R0
SYMATTR InstName C7
SYMATTR Value 1
SYMBOL nmos -704 -72 M0
SYMATTR InstName Q1
SYMATTR Value FDC2512
SYMBOL PowerProducts\\LTC3726 352 168 R0
SYMATTR InstName U2
SYMBOL cap 656 280 R0
SYMATTR InstName C8
SYMATTR Value .001
SYMBOL cap 672 184 M90
SYMATTR InstName C9
SYMATTR Value 680p
SYMATTR SpiceLine Rser=20K
SYMBOL res 800 24 R0
SYMATTR InstName R5
SYMATTR Value 110K
SYMBOL res 800 136 R0
SYMATTR InstName R6
SYMATTR Value 24.9K
SYMBOL voltage -832 -312 R0
SYMATTR InstName V1
SYMATTR Value 36
SYMBOL ind2 -304 -312 R0
SYMATTR InstName L3
SYMATTR Value 194
SYMATTR Type ind
SYMATTR SpiceLine Rpar=10K
SYMBOL nmos -416 -200 R0
SYMATTR InstName Q2
SYMATTR Value Si7540DP_N
SYMBOL res -384 -88 R0
SYMATTR InstName R8
SYMATTR Value 25m
SYMBOL ind2 -224 -312 M0
SYMATTR InstName L4
SYMATTR Value 9.58
SYMATTR Type ind
SYMATTR SpiceLine Rpar=10K
SYMBOL nmos 384 -152 M0
SYMATTR InstName Q3
SYMATTR Value IRF6623
SYMBOL nmos -112 -184 M0
SYMATTR InstName Q4
SYMATTR Value IRF6623
SYMBOL cap 432 -296 R0
SYMATTR InstName C14
SYMATTR Value 1000
SYMBOL ind2 -224 -472 M0
SYMATTR InstName L5
SYMATTR Value 100
SYMATTR Type ind
SYMATTR SpiceLine Rser=2 Rpar=10K
SYMBOL schottky -112 -456 R270
SYMATTR InstName D1
SYMATTR Value CMDSH2-3
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 32 -456 R0
SYMATTR InstName C15
SYMATTR Value 10
SYMBOL res 624 -440 R0
SYMATTR InstName R10
SYMATTR Value 500
SYMBOL zener 624 -136 M180
SYMATTR InstName D2
SYMATTR Value BZX84C8V2L
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL npn 608 -264 M0
SYMATTR InstName Q5
SYMATTR Value FZT849
SYMBOL cap 640 -56 R0
SYMATTR InstName C16
SYMATTR Value 34
SYMBOL ind2 336 -296 R270
SYMATTR InstName L6
SYMATTR Value 1.5
SYMATTR Type ind
SYMATTR SpiceLine Rpar=1K
SYMBOL res 848 -312 R0
SYMATTR InstName Rload
SYMATTR Value .165
SYMBOL res -176 -56 R0
SYMATTR InstName R9
SYMATTR Value 2m