* SPICE netlist
MQ1 N001 N005 0 0 IRF7201
MQ2 N004 N008 0 0 IRF7201
C1 N016 0 270p
R1 N007 N006 200K
R2 IN N010 300K
C2 N014 0 .1
V1 IN 0 12
L1 N001 IN 1m Rpar=1K
L2 IN N004 1m Rpar=1K
L3 N002 N003 1m Rpar=1K
L4 N002 OUT 20
L5 N003 OUT 20
R3 OUT N009 15.8K
R4 N009 0 5K
C3 N015 N009 .003 Rser=10K
C4 OUT 0 50 Rser=.1
R5 N012 0 10K
MQ3 N003 N011 0 0 IRF7201
MQ4 N002 N013 0 0 IRF7201
XU1 N008 IN N005 N011 0 N016 N012 N006 0 N015 N010 N009 N014 IN N007 N013 LTC3723-2 ;pnba DRVB)Vcc)DRVA)SDRA)GND)Ct)Sprog)Dprg)CS)COMP)Ramp)FB)SS)UVLO)Vref)SDRB
C5 N010 0 270p
C6 OUT N009 .001 Rser=10K
Rload OUT 0 2.5
K1 L1 L2 L3 1
.tran 10m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1392 736
WIRE 184 -368 24 -368
WIRE 184 -352 184 -368
WIRE 408 -320 232 -320
WIRE 440 -320 408 -320
WIRE 552 -320 520 -320
WIRE 616 -320 552 -320
WIRE 696 -320 616 -320
WIRE 232 -304 232 -320
WIRE 616 -304 616 -320
WIRE 696 -304 696 -320
WIRE -568 -256 -696 -256
WIRE -392 -256 -568 -256
WIRE -184 -256 -392 -256
WIRE 184 -256 184 -272
WIRE 184 -256 -184 -256
WIRE -696 -240 -696 -256
WIRE 184 -240 184 -256
WIRE 24 -208 24 -368
WIRE 232 -208 232 -224
WIRE 296 -208 232 -208
WIRE 440 -208 296 -208
WIRE 552 -208 552 -320
WIRE 552 -208 520 -208
WIRE 616 -208 616 -240
WIRE 696 -208 696 -224
WIRE -568 -192 -568 -256
WIRE -184 -176 -184 -256
WIRE -696 -144 -696 -160
WIRE 184 -144 184 -160
WIRE -392 -128 -392 -256
WIRE -344 -128 -392 -128
WIRE -24 -128 -40 -128
WIRE 552 -128 552 -208
WIRE 648 -128 552 -128
WIRE 24 -96 24 -112
WIRE 552 -80 552 -128
WIRE 648 -80 648 -128
WIRE -440 -64 -472 -64
WIRE -344 -64 -360 -64
WIRE 136 -64 -40 -64
WIRE 184 -32 184 -48
WIRE 296 -16 296 -208
WIRE -472 0 -472 -64
WIRE -344 0 -472 0
WIRE -24 0 -40 0
WIRE 408 48 408 -320
WIRE 552 48 552 0
WIRE 648 48 648 -16
WIRE 648 48 552 48
WIRE -568 64 -568 -112
WIRE -344 64 -568 64
WIRE 248 64 -40 64
WIRE -568 80 -568 64
WIRE 296 96 296 80
WIRE -440 128 -472 128
WIRE -344 128 -360 128
WIRE 360 128 -40 128
WIRE -568 160 -568 144
WIRE 408 160 408 144
WIRE -344 192 -408 192
WIRE 24 192 -40 192
WIRE 168 192 88 192
WIRE -424 256 -472 256
WIRE -344 256 -360 256
WIRE 168 256 168 192
WIRE 168 256 -40 256
WIRE 552 256 552 48
WIRE 552 256 168 256
WIRE 552 272 552 256
WIRE -184 304 -184 288
WIRE 552 368 552 352
FLAG -472 256 0
FLAG -184 304 0
FLAG -472 192 0
FLAG -696 -144 0
FLAG 408 160 0
FLAG 552 368 0
FLAG 696 -208 0
FLAG 616 -208 0
FLAG -472 128 0
FLAG 296 96 0
FLAG -568 160 0
FLAG -24 0 0
FLAG 184 -32 0
FLAG 24 -96 0
FLAG -696 -256 IN
FLAG 696 -320 OUT
SYMBOL nmos -24 -208 R0
SYMATTR InstName Q1
SYMATTR Value IRF7201
SYMBOL nmos 136 -144 R0
SYMATTR Value IRF7201
SYMATTR InstName Q2
SYMBOL cap -360 240 R90
SYMATTR Value 270p
SYMATTR InstName C1
SYMBOL res -344 -80 R90
SYMATTR InstName R1
SYMATTR Value 200K
SYMBOL res -584 -208 R0
SYMATTR InstName R2
SYMATTR Value 300K
SYMBOL cap -408 176 R90
SYMATTR Value .1
SYMATTR InstName C2
SYMBOL voltage -696 -256 R0
SYMATTR Value 12
SYMATTR InstName V1
SYMBOL ind2 168 -368 R0
SYMATTR InstName L1
SYMATTR Value 1m
SYMATTR Type ind
SYMATTR SpiceLine Rpar=1K
SYMBOL ind2 168 -256 R0
SYMATTR InstName L2
SYMATTR Value 1m
SYMATTR Type ind
SYMATTR SpiceLine Rpar=1K
SYMBOL ind2 248 -320 M0
SYMATTR InstName L3
SYMATTR Value 1m
SYMATTR Type ind
SYMATTR SpiceLine Rpar=1K
SYMBOL ind 424 -304 R270
SYMATTR InstName L4
SYMATTR Value 20
SYMBOL ind 424 -192 R270
SYMATTR InstName L5
SYMATTR Value 20
SYMBOL res 536 -96 R0
SYMATTR InstName R3
SYMATTR Value 15.8K
SYMBOL res 536 256 R0
SYMATTR InstName R4
SYMATTR Value 5K
SYMBOL cap 24 176 M90
SYMATTR InstName C3
SYMATTR Value .003
SYMATTR SpiceLine Rser=10K
SYMBOL cap 600 -304 R0
SYMATTR InstName C4
SYMATTR Value 50
SYMATTR Value2 Rser=.1
SYMBOL res -344 112 R90
SYMATTR InstName R5
SYMATTR Value 10K
SYMBOL nmos 248 -16 R0
SYMATTR InstName Q3
SYMATTR Value IRF7201
SYMBOL nmos 360 48 R0
SYMATTR InstName Q4
SYMATTR Value IRF7201
SYMBOL PowerProducts\\LTC3723-2 -184 48 R0
SYMATTR InstName U1
SYMBOL cap -584 80 R0
SYMATTR Value 270p
SYMATTR InstName C5
SYMBOL cap 632 -80 R0
SYMATTR Value .001
SYMATTR SpiceLine Rser=10K
SYMATTR InstName C6
SYMBOL res 680 -320 R0
SYMATTR InstName Rload
SYMATTR Value 2.5