* SPICE netlist
MQ1 IN N004 N007 N007 Si7852DP m=2
XU2 N001 0 A N007 N004 N002 LTC4440 ;pnba VCC)GND)INP)TS)TG)BOOST
C1 N002 N007 .22
D1 N001 N002 GSD2004W-V
MQ2 N007 N014 N016 N016 Si7852DP m=2
Q3 N001 B N014 0 2N4401
Q4 0 B N014 0 2N4403
MQ5 IN N005 N008 N008 Si7852DP m=2
XU3 N001 0 C N008 N005 N003 LTC4440 ;pnba VCC)GND)INP)TS)TG)BOOST
C2 N003 N008 .22
D2 N001 N003 GSD2004W-V
MQ6 N008 N015 N016 N016 Si7852DP m=2
Q7 N001 D N015 0 2N4401
Q8 0 D N015 0 2N4403
R1 N016 0 10m
C3 N019 0 100p
R2 N019 N016 510
L1 N008 N007 50 Rser=3.25m Rpar=5K
L2 N011 N009 32 Rser=1m Rpar=2K
MQ9 N011 N017 0 0 Si7852DP m=4
L4 N009 OUT 2.4 Rser=2m Rpar=1K
C4 OUT 0 1000 Rser=5m
Q10 N001 N013 N017 0 2N4401
Q11 0 N013 N017 0 2N4403
MQ12 N009 N023 0 0 Si7852DP m=4
Q13 N001 N021 N023 0 2N4401
Q14 0 N021 N023 0 2N4403
R3 OUT N025 3.15K
R4 N025 0 1K
C5 N027 N025 .15 Rser=5K
V1 IN 0 48
C6 N026 0 180p
C7 N028 0 .001
R5 0 N020 30K
R6 N018 N022 60K
R7 N024 0 10K
R8 N001 N010 150
C8 N010 0 1
R9 0 N012 4.99K
R13 IN N006 182K
R14 N006 0 30.1K
R15 N018 N012 80.6K
V2 N001 0 12
Rload OUT 0 .25
L3 N011 OUT 2.4 Rser=2m Rpar=1K
V3 N029 0 PULSE(0 3.3 0 10n 10n 1.25u 2.5u)
R10 SYNC N029 1K
R11 SYNC 0 5.1K
XU4 SYNC N022 N019 N027 N024 N025 N028 MP_01 N012 N018 N012 N006 N020 N018 N013 N021 C N010 D B A 0 0 N026 LTC3722-1 ;pnba SYNC)DPRG)CS)Comp)RLEB)FB)SS))PDLY)SBUS)ADLY)UVLO)SPRG)Vref)OutF)OutE)OutC)Vcc)OutD)OutB)OutA)PGND)GND)Ct
K1 L1 L2 .99
.tran 750u startup

* LTspice schematic (.asc)
Version 4
SHEET 1 2736 1424
WIRE -1048 -712 -1288 -712
WIRE -168 -712 -1048 -712
WIRE -1288 -696 -1288 -712
WIRE -808 -680 -920 -680
WIRE -712 -680 -808 -680
WIRE -408 -680 -712 -680
WIRE -120 -680 -408 -680
WIRE 56 -680 -120 -680
WIRE 392 -680 56 -680
WIRE 568 -680 392 -680
WIRE 904 -680 568 -680
WIRE -1048 -664 -1048 -712
WIRE 56 -664 56 -680
WIRE -808 -648 -808 -680
WIRE -408 -648 -408 -680
WIRE -1288 -600 -1288 -616
WIRE -168 -584 -168 -712
WIRE -168 -584 -280 -584
WIRE -72 -584 -168 -584
WIRE -808 -552 -808 -568
WIRE -712 -552 -712 -680
WIRE -696 -552 -712 -552
WIRE -408 -552 -408 -584
WIRE -408 -552 -440 -552
WIRE -280 -552 -280 -584
WIRE -72 -552 -72 -584
WIRE 56 -552 56 -600
WIRE 120 -552 56 -552
WIRE 392 -552 392 -680
WIRE 392 -552 376 -552
WIRE -744 -472 -760 -472
WIRE -696 -472 -744 -472
WIRE -328 -472 -440 -472
WIRE 120 -472 -24 -472
WIRE 424 -472 376 -472
WIRE -920 -456 -920 -680
WIRE -1160 -392 -1176 -392
WIRE -1048 -392 -1048 -584
WIRE -1048 -392 -1080 -392
WIRE -696 -392 -712 -392
WIRE -408 -392 -408 -488
WIRE -408 -392 -440 -392
WIRE -280 -392 -280 -456
WIRE -280 -392 -408 -392
WIRE -72 -392 -72 -456
WIRE 56 -392 56 -488
WIRE 56 -392 -72 -392
WIRE 120 -392 56 -392
WIRE 392 -392 376 -392
WIRE 680 -392 616 -392
WIRE 1032 -392 728 -392
WIRE 1080 -392 1032 -392
WIRE 1192 -392 1160 -392
WIRE 1240 -392 1192 -392
WIRE 1368 -392 1240 -392
WIRE 1240 -376 1240 -392
WIRE 1368 -376 1368 -392
WIRE 680 -360 680 -392
WIRE 728 -360 728 -392
WIRE -920 -344 -920 -376
WIRE -840 -344 -920 -344
WIRE -840 -328 -840 -344
WIRE -280 -328 -280 -392
WIRE 616 -328 616 -392
WIRE 616 -328 -280 -328
WIRE -72 -280 -72 -392
WIRE 616 -280 -72 -280
WIRE 1240 -280 1240 -312
WIRE 1368 -280 1368 -296
WIRE -1352 -264 -1352 -280
WIRE -840 -248 -840 -264
WIRE 616 -248 616 -280
WIRE 680 -248 680 -280
WIRE 680 -248 616 -248
WIRE 728 -248 728 -280
WIRE 760 -248 728 -248
WIRE 1080 -248 760 -248
WIRE 1192 -248 1192 -392
WIRE 1192 -248 1160 -248
WIRE -120 -232 -120 -680
WIRE -120 -232 -408 -232
WIRE 104 -232 -120 -232
WIRE -1048 -216 -1048 -392
WIRE -920 -216 -920 -344
WIRE -408 -216 -408 -232
WIRE 104 -216 104 -232
WIRE -280 -184 -280 -328
WIRE -72 -184 -72 -280
WIRE -1352 -168 -1352 -184
WIRE -1208 -168 -1352 -168
WIRE -1176 -168 -1208 -168
WIRE -760 -168 -760 -472
WIRE -760 -168 -792 -168
WIRE -472 -168 -504 -168
WIRE 184 -168 168 -168
WIRE 568 -168 568 -680
WIRE -1352 -136 -1352 -168
WIRE 760 -136 760 -248
WIRE 504 -120 488 -120
WIRE -1208 -104 -1208 -168
WIRE -1176 -104 -1208 -104
WIRE -728 -104 -792 -104
WIRE -504 -104 -504 -168
WIRE -504 -104 -728 -104
WIRE -408 -104 -408 -120
WIRE -328 -104 -408 -104
WIRE 104 -104 104 -120
WIRE 104 -104 -24 -104
WIRE 184 -104 184 -168
WIRE 200 -104 184 -104
WIRE -408 -88 -408 -104
WIRE 104 -88 104 -104
WIRE -280 -72 -280 -88
WIRE -168 -72 -280 -72
WIRE -72 -72 -72 -88
WIRE -72 -72 -168 -72
WIRE -168 -56 -168 -72
WIRE 488 -56 488 -120
WIRE 488 -56 472 -56
WIRE 568 -56 568 -72
WIRE 712 -56 568 -56
WIRE -1352 -40 -1352 -56
WIRE -1176 -40 -1352 -40
WIRE -712 -40 -792 -40
WIRE -664 -40 -712 -40
WIRE -552 -40 -584 -40
WIRE -504 -40 -504 -104
WIRE -472 -40 -504 -40
WIRE 184 -40 184 -104
WIRE 184 -40 168 -40
WIRE 568 -40 568 -56
WIRE -712 -24 -712 -40
WIRE 760 -24 760 -40
WIRE 488 8 488 -56
WIRE 504 8 488 8
WIRE -1352 24 -1352 -40
WIRE -1176 24 -1352 24
WIRE -760 24 -792 24
WIRE -408 24 -408 8
WIRE 104 24 104 8
WIRE -168 40 -168 24
WIRE 904 40 904 -680
WIRE -552 56 -552 -40
WIRE -280 56 -280 -72
WIRE -280 56 -552 56
WIRE -760 72 -760 24
WIRE 184 72 -760 72
WIRE 200 72 200 -104
WIRE 200 72 184 72
WIRE 568 72 568 56
WIRE 1032 72 1032 -392
WIRE 1192 72 1192 -248
WIRE -1272 88 -1304 88
WIRE -1176 88 -1192 88
WIRE 360 88 -792 88
WIRE 424 88 424 -472
WIRE 424 88 360 88
WIRE 840 88 824 88
WIRE -1352 152 -1352 24
WIRE -1336 152 -1352 152
WIRE -1176 152 -1256 152
WIRE 824 152 824 88
WIRE 824 152 -792 152
WIRE 904 152 904 136
WIRE 984 152 904 152
WIRE 904 168 904 152
WIRE 1032 184 1032 168
WIRE -1272 216 -1336 216
WIRE -1176 216 -1192 216
WIRE 472 216 472 -56
WIRE 472 216 -792 216
WIRE 824 216 824 152
WIRE 840 216 824 216
WIRE 1192 216 1192 152
WIRE 1192 216 1128 216
WIRE 1192 264 1192 216
WIRE -1320 280 -1336 280
WIRE -1176 280 -1256 280
WIRE -712 280 -792 280
WIRE -584 280 -648 280
WIRE 904 280 904 264
WIRE -1256 344 -1336 344
WIRE -1176 344 -1192 344
WIRE -584 344 -584 280
WIRE -584 344 -792 344
WIRE 1128 344 1128 216
WIRE 1128 344 -584 344
WIRE 1192 360 1192 344
WIRE -984 408 -984 392
WIRE -856 408 -856 392
WIRE -1256 440 -1336 440
WIRE -1144 440 -1176 440
WIRE -1112 440 -1112 392
WIRE -1112 440 -1144 440
WIRE -1112 456 -1112 440
WIRE -1112 584 -1112 536
WIRE -1112 712 -1112 664
FLAG -712 -392 0
FLAG -408 24 0
FLAG 392 -392 0
FLAG 104 24 0
FLAG -168 40 0
FLAG -712 40 0
FLAG 1240 -280 0
FLAG 1368 -280 0
FLAG 760 -24 0
FLAG 568 72 0
FLAG 1032 184 0
FLAG 904 280 0
FLAG 1368 -392 OUT
FLAG -984 408 0
FLAG -856 408 0
FLAG 1192 360 0
FLAG -1288 -600 0
FLAG -1336 280 0
FLAG -1336 344 0
FLAG -1336 216 0
FLAG -840 -248 0
FLAG -1352 -280 0
FLAG -1176 -392 0
FLAG -808 -552 0
FLAG -1288 -712 IN
FLAG -1304 88 0
FLAG -744 -472 A
FLAG -728 -104 B
FLAG 360 88 C
FLAG 184 72 D
FLAG -1112 712 0
FLAG -1336 440 0
FLAG -1144 440 SYNC
SYMBOL nmos -328 -552 R0
SYMATTR Value Si7852DP
SYMATTR InstName Q1
SYMATTR Value2 m=2
SYMBOL PowerProducts\\LTC4440 -568 -472 R0
SYMATTR InstName U2
SYMBOL cap -424 -552 R0
SYMATTR InstName C1
SYMATTR Value .22
SYMBOL diode -424 -648 R0
SYMATTR InstName D1
SYMATTR Value GSD2004W-V
SYMBOL nmos -328 -184 R0
SYMATTR Value Si7852DP
SYMATTR InstName Q2
SYMATTR Value2 m=2
SYMBOL npn -472 -216 R0
SYMATTR InstName Q3
SYMATTR Value 2N4401
SYMBOL pnp -472 8 M180
SYMATTR InstName Q4
SYMATTR Value 2N4403
SYMBOL nmos -24 -552 M0
SYMATTR Value Si7852DP
SYMATTR InstName Q5
SYMATTR Value2 m=2
SYMBOL PowerProducts\\LTC4440 248 -472 M0
SYMATTR InstName U3
SYMBOL cap 40 -552 R0
SYMATTR InstName C2
SYMATTR Value .22
SYMBOL diode 40 -664 R0
SYMATTR Value GSD2004W-V
SYMATTR InstName D2
SYMBOL nmos -24 -184 M0
SYMATTR Value Si7852DP
SYMATTR InstName Q6
SYMATTR Value2 m=2
SYMBOL npn 168 -216 M0
SYMATTR Value 2N4401
SYMATTR InstName Q7
SYMBOL pnp 168 8 R180
SYMATTR InstName Q8
SYMATTR Value 2N4403
SYMBOL res -184 -72 R0
SYMATTR InstName R1
SYMATTR Value 10m
SYMBOL cap -728 -24 R0
SYMATTR Value 100p
SYMATTR InstName C3
SYMBOL res -680 -24 R270
SYMATTR InstName R2
SYMATTR Value 510
SYMBOL ind2 664 -264 M180
SYMATTR InstName L1
SYMATTR Value 50
SYMATTR Type ind
SYMATTR SpiceLine Rser=3.25m Rpar=5K
SYMBOL ind2 744 -264 R180
SYMATTR InstName L2
SYMATTR Value 32
SYMATTR Type ind
SYMATTR SpiceLine Rser=1m Rpar=2K
SYMBOL nmos 712 -136 R0
SYMATTR Value Si7852DP
SYMATTR InstName Q9
SYMATTR Value2 m=4
SYMBOL ind 1064 -376 R270
SYMATTR InstName L4
SYMATTR Value 2.4
SYMATTR SpiceLine Rser=2m Rpar=1K
SYMBOL cap 1224 -376 R0
SYMATTR InstName C4
SYMATTR Value 1000
SYMATTR SpiceLine Rser=5m
SYMBOL npn 504 -168 R0
SYMATTR InstName Q10
SYMATTR Value 2N4401
SYMBOL pnp 504 56 M180
SYMATTR InstName Q11
SYMATTR Value 2N4403
SYMBOL nmos 984 72 R0
SYMATTR Value Si7852DP
SYMATTR InstName Q12
SYMATTR Value2 m=4
SYMBOL npn 840 40 R0
SYMATTR InstName Q13
SYMATTR Value 2N4401
SYMBOL pnp 840 264 M180
SYMATTR InstName Q14
SYMATTR Value 2N4403
SYMBOL res 1176 56 R0
SYMATTR InstName R3
SYMATTR Value 3.15K
SYMBOL res 1176 248 R0
SYMATTR InstName R4
SYMATTR Value 1K
SYMBOL cap -712 296 R270
SYMATTR InstName C5
SYMATTR Value .15
SYMATTR SpiceLine Rser=5K
SYMBOL voltage -1288 -712 R0
SYMATTR InstName V1
SYMATTR Value 48
SYMBOL cap -1256 264 R90
SYMATTR InstName C6
SYMATTR Value 180p
SYMBOL cap -1192 328 R90
SYMATTR InstName C7
SYMATTR Value .001
SYMBOL res -1288 104 R270
SYMATTR InstName R5
SYMATTR Value 30K
SYMBOL res -1352 168 R270
SYMATTR InstName R6
SYMATTR Value 60K
SYMBOL res -1176 200 R90
SYMATTR InstName R7
SYMATTR Value 10K
SYMBOL res -936 -472 R0
SYMATTR InstName R8
SYMATTR Value 150
SYMBOL cap -856 -328 R0
SYMATTR InstName C8
SYMATTR Value 1
SYMBOL res -1368 -280 R0
SYMATTR InstName R9
SYMATTR Value 4.99K
SYMBOL res -1064 -680 R0
SYMATTR InstName R13
SYMATTR Value 182K
SYMBOL res -1064 -408 R90
SYMATTR InstName R14
SYMATTR Value 30.1K
SYMBOL res -1368 -40 M180
SYMATTR InstName R15
SYMATTR Value 80.6K
SYMBOL voltage -808 -664 R0
SYMATTR InstName V2
SYMATTR Value 12
SYMBOL res 1352 -392 R0
SYMATTR InstName Rload
SYMATTR Value .25
SYMBOL ind 1064 -232 R270
SYMATTR InstName L3
SYMATTR Value 2.4
SYMATTR SpiceLine Rser=2m Rpar=1K
SYMBOL voltage -1112 568 R0
SYMATTR InstName V3
SYMATTR Value PULSE(0 3.3 0 10n 10n 1.25u 2.5u)
SYMBOL res -1128 440 R0
SYMATTR InstName R10
SYMATTR Value 1K
SYMBOL res -1160 424 R90
SYMATTR InstName R11
SYMATTR Value 5.1K
SYMBOL LTC3722-1 -984 88 R0
SYMATTR InstName U4