* SPICE netlist
R1 IN1 N001 7m
MQ1 N001 N002 OUT1 OUT1 IRF7413
R2 N002 N005 10
R3 N006 N005 100
MQ2 N003 N004 OUT2 OUT2 IRF7413
R4 N004 N005 10
R5 IN2 N003 5m
C1 N006 0 0.047
V1 IN1 0 PULSE(0 5 5m 5m 5m 250m 300m)
V2 IN2 0 PULSE(0 3.3 5m 5m 5m 250m 300m)
V3 IN3 0 PULSE(0 12 5m 5m 5m 400m 450m)
V4 IN4 0 PULSE(0 -12 5m 5m 5m 400m 450m)
V5 N007 0 PWL(0 3.3 40m 3.3 +1u 0)
V6 N011 0 12
R6 N009 N011 10K
C2 OUT2 0 30 Rser=10m
C3 OUT3 0 10 Rser=10m
C4 OUT4 0 10 Rser=10m
C5 N008 0 0.1
C6 OUT1 0 30 Rser=10m
R7 N010 N011 10K
XU1 IN3 IN4 OUT2 N008 N007 N009 N010 0 IN2 N003 N005 N001 IN1 OUT1 OUT4 OUT3 LTC1643AL-1 ;pnba 12Vin)VeeIN)3Vout)Timer)_ON)_Fault)_PWRGD)GND)3Vin)3Vsense)Gate)5Vsense)5Vin)5Vout)VeeOUT)12Vout
R8 OUT1 0 2
R9 OUT2 0 0.87
R10 OUT3 0 30
R11 OUT4 0 150
.tran 550m

* LTspice schematic (.asc)
Version 4
SHEET 1 1632 1040
WIRE -432 -520 -816 -520
WIRE 144 -520 -432 -520
WIRE 160 -520 144 -520
WIRE 256 -520 240 -520
WIRE 320 -520 256 -520
WIRE 624 -520 416 -520
WIRE 688 -520 624 -520
WIRE 768 -520 688 -520
WIRE 816 -520 768 -520
WIRE 688 -504 688 -520
WIRE 816 -504 816 -520
WIRE -816 -488 -816 -520
WIRE 400 -424 400 -472
WIRE 688 -408 688 -440
WIRE 816 -408 816 -424
WIRE -816 -376 -816 -408
WIRE -432 -296 -816 -296
WIRE -304 -296 -432 -296
WIRE -288 -296 -304 -296
WIRE -192 -296 -208 -296
WIRE -160 -296 -192 -296
WIRE 32 -296 -64 -296
WIRE 688 -296 32 -296
WIRE 768 -296 688 -296
WIRE 816 -296 768 -296
WIRE 688 -280 688 -296
WIRE 816 -280 816 -296
WIRE -816 -264 -816 -296
WIRE -80 -232 -80 -248
WIRE 688 -184 688 -216
WIRE 816 -184 816 -200
WIRE -816 -152 -816 -184
WIRE -80 -136 -80 -152
WIRE 400 -136 400 -344
WIRE 400 -136 -80 -136
WIRE 416 -136 400 -136
WIRE 512 -136 496 -136
WIRE 592 -136 576 -136
WIRE 624 -72 624 -520
WIRE 624 -72 384 -72
WIRE -304 -56 -304 -296
WIRE -192 -56 -192 -296
WIRE -80 -56 -80 -136
WIRE 32 -56 32 -296
WIRE 144 -56 144 -520
WIRE 256 -56 256 -520
WIRE 384 -56 384 -72
WIRE -384 40 -416 40
WIRE 688 40 464 40
WIRE 768 40 688 40
WIRE 816 40 768 40
WIRE 688 56 688 40
WIRE 816 56 816 40
WIRE -800 104 -816 104
WIRE -448 104 -720 104
WIRE -384 104 -448 104
WIRE 592 152 464 152
WIRE 688 152 688 120
WIRE 816 152 816 136
WIRE -448 168 -592 168
WIRE -384 168 -448 168
WIRE -800 232 -816 232
WIRE -592 232 -592 168
WIRE -592 232 -720 232
WIRE -384 232 -544 232
WIRE 592 248 592 152
WIRE 688 248 592 248
WIRE 768 248 688 248
WIRE 816 248 768 248
WIRE 480 264 464 264
WIRE 560 264 544 264
WIRE 688 264 688 248
WIRE 816 264 816 248
WIRE -384 296 -496 296
WIRE -496 344 -496 296
WIRE -720 360 -736 360
WIRE -544 360 -544 232
WIRE -544 360 -640 360
WIRE -384 360 -416 360
WIRE 688 360 688 328
WIRE 816 360 816 344
WIRE -416 424 -416 360
WIRE -640 520 -672 520
WIRE -496 520 -496 424
WIRE -496 520 -560 520
WIRE -416 520 -416 504
WIRE -416 520 -496 520
FLAG 688 -408 0
FLAG 816 -408 0
FLAG 592 -136 0
FLAG -736 360 0
FLAG -816 -376 0
FLAG 688 -184 0
FLAG 816 -184 0
FLAG -816 -152 0
FLAG -816 104 0
FLAG -816 232 0
FLAG -672 520 0
FLAG 688 152 0
FLAG 816 152 0
FLAG 688 360 0
FLAG 816 360 0
FLAG 560 264 0
FLAG -416 40 0
FLAG -432 -520 IN1
FLAG -432 -296 IN2
FLAG -448 104 IN3
FLAG -448 168 IN4
FLAG 768 -520 OUT1
FLAG 768 -296 OUT2
FLAG 768 40 OUT3
FLAG 768 248 OUT4
SYMBOL res 144 -504 R270
SYMATTR InstName R1
SYMATTR Value 7m
SYMBOL nmos 320 -472 R270
SYMATTR InstName Q1
SYMATTR Value IRF7413
SYMBOL res 384 -440 R0
SYMATTR InstName R2
SYMATTR Value 10
SYMBOL res 512 -152 R90
SYMATTR InstName R3
SYMATTR Value 100
SYMBOL nmos -160 -248 R270
SYMATTR InstName Q2
SYMATTR Value IRF7413
SYMBOL res -96 -248 R0
SYMATTR InstName R4
SYMATTR Value 10
SYMBOL res -304 -280 R270
SYMATTR InstName R5
SYMATTR Value 5m
SYMBOL cap 512 -120 R270
SYMATTR InstName C1
SYMATTR Value 0.047
SYMBOL voltage -816 -504 R0
SYMATTR InstName V1
SYMATTR Value PULSE(0 5 5m 5m 5m 250m 300m)
SYMBOL voltage -816 -280 R0
SYMATTR InstName V2
SYMATTR Value PULSE(0 3.3 5m 5m 5m 250m 300m)
SYMBOL voltage -704 104 R90
SYMATTR InstName V3
SYMATTR Value PULSE(0 12 5m 5m 5m 400m 450m)
SYMBOL voltage -704 232 R90
SYMATTR InstName V4
SYMATTR Value PULSE(0 -12 5m 5m 5m 400m 450m)
SYMBOL voltage -624 360 R90
SYMATTR InstName V5
SYMATTR Value PWL(0 3.3 40m 3.3 +1u 0)
SYMBOL voltage -544 520 R90
SYMATTR InstName V6
SYMATTR Value 12
SYMBOL res -512 328 R0
SYMATTR InstName R6
SYMATTR Value 10K
SYMBOL cap 672 -280 R0
SYMATTR InstName C2
SYMATTR Value 30
SYMATTR SpiceLine Rser=10m
SYMBOL cap 672 56 R0
SYMATTR InstName C3
SYMATTR Value 10
SYMATTR SpiceLine Rser=10m
SYMBOL cap 672 264 R0
SYMATTR InstName C4
SYMATTR Value 10
SYMATTR SpiceLine Rser=10m
SYMBOL cap 480 280 R270
SYMATTR InstName C5
SYMATTR Value 0.1
SYMBOL cap 672 -504 R0
SYMATTR InstName C6
SYMATTR Value 30
SYMATTR SpiceLine Rser=10m
SYMBOL res -432 408 R0
SYMATTR InstName R7
SYMATTR Value 10K
SYMBOL LTC1643AL-1 32 168 R0
SYMATTR InstName U1
SYMBOL res 800 -520 R0
SYMATTR InstName R8
SYMATTR Value 2
SYMBOL res 800 -296 R0
SYMATTR InstName R9
SYMATTR Value 0.87
SYMBOL res 800 40 R0
SYMATTR InstName R10
SYMATTR Value 30
SYMBOL res 800 248 R0
SYMATTR InstName R11
SYMATTR Value 150