* 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 ;pnba 12Vin)VeeIN)3Vout)Timer)_ON)_Fault)_PWRGD)GND)3Vin)3Vsense)Gate)5Vsense)5Vin)5Vout)VeeOUT)12Vout
Rload1 OUT1 0 1
Rload2 OUT2 0 0.87
Rload3 OUT3 0 30
Rload4 OUT4 0 150
.tran 550m

* LTspice schematic (.asc)
Version 4
SHEET 1 1680 1024
WIRE -488 -512 -760 -512
WIRE 168 -512 -488 -512
WIRE 184 -512 168 -512
WIRE 280 -512 264 -512
WIRE 328 -512 280 -512
WIRE 632 -512 424 -512
WIRE 712 -512 632 -512
WIRE 792 -512 712 -512
WIRE 840 -512 792 -512
WIRE -760 -496 -760 -512
WIRE 712 -496 712 -512
WIRE 840 -496 840 -512
WIRE 408 -416 408 -464
WIRE -760 -400 -760 -416
WIRE 712 -400 712 -432
WIRE 840 -400 840 -416
WIRE -488 -304 -760 -304
WIRE -280 -304 -488 -304
WIRE -264 -304 -280 -304
WIRE -168 -304 -184 -304
WIRE -136 -304 -168 -304
WIRE 56 -304 -40 -304
WIRE 712 -304 56 -304
WIRE 792 -304 712 -304
WIRE 840 -304 792 -304
WIRE -760 -288 -760 -304
WIRE 712 -288 712 -304
WIRE 840 -288 840 -304
WIRE -56 -240 -56 -256
WIRE -760 -192 -760 -208
WIRE 712 -192 712 -224
WIRE 840 -192 840 -208
WIRE -56 -144 -56 -160
WIRE 408 -144 408 -336
WIRE 408 -144 -56 -144
WIRE 424 -144 408 -144
WIRE 520 -144 504 -144
WIRE 600 -144 584 -144
WIRE 632 -80 632 -512
WIRE 632 -80 408 -80
WIRE -280 -64 -280 -304
WIRE -168 -64 -168 -304
WIRE -56 -64 -56 -144
WIRE 56 -64 56 -304
WIRE 168 -64 168 -512
WIRE 280 -64 280 -512
WIRE 408 -64 408 -80
WIRE -360 32 -392 32
WIRE 712 32 488 32
WIRE 792 32 712 32
WIRE 840 32 792 32
WIRE 712 48 712 32
WIRE 840 48 840 32
WIRE -824 96 -840 96
WIRE -488 96 -744 96
WIRE -360 96 -488 96
WIRE 616 144 488 144
WIRE 712 144 712 112
WIRE 840 144 840 128
WIRE -488 160 -616 160
WIRE -360 160 -488 160
WIRE -824 224 -840 224
WIRE -616 224 -616 160
WIRE -616 224 -744 224
WIRE -360 224 -520 224
WIRE 616 240 616 144
WIRE 712 240 616 240
WIRE 792 240 712 240
WIRE 840 240 792 240
WIRE 504 256 488 256
WIRE 584 256 568 256
WIRE 712 256 712 240
WIRE 840 256 840 240
WIRE -360 288 -472 288
WIRE -472 336 -472 288
WIRE -744 352 -760 352
WIRE -520 352 -520 224
WIRE -520 352 -664 352
WIRE -360 352 -392 352
WIRE 712 352 712 320
WIRE 840 352 840 336
WIRE -392 416 -392 352
WIRE -616 512 -648 512
WIRE -472 512 -472 416
WIRE -472 512 -536 512
WIRE -392 512 -392 496
WIRE -392 512 -472 512
FLAG 712 -400 0
FLAG 840 -400 0
FLAG 600 -144 0
FLAG -760 352 0
FLAG -760 -400 0
FLAG 712 -192 0
FLAG 840 -192 0
FLAG -760 -192 0
FLAG -840 96 0
FLAG -840 224 0
FLAG -648 512 0
FLAG 712 144 0
FLAG 840 144 0
FLAG 712 352 0
FLAG 840 352 0
FLAG 584 256 0
FLAG -392 32 0
FLAG -488 -304 IN2
FLAG -488 -512 IN1
FLAG -488 96 IN3
FLAG 792 -512 OUT1
FLAG 792 -304 OUT2
FLAG 792 32 OUT3
FLAG -488 160 IN4
FLAG 792 240 OUT4
SYMBOL res 168 -496 R270
SYMATTR InstName R1
SYMATTR Value 7m
SYMBOL nmos 328 -464 R270
SYMATTR InstName Q1
SYMATTR Value IRF7413
SYMBOL res 392 -432 R0
SYMATTR InstName R2
SYMATTR Value 10
SYMBOL res 520 -160 R90
SYMATTR InstName R3
SYMATTR Value 100
SYMBOL nmos -136 -256 R270
SYMATTR InstName Q2
SYMATTR Value IRF7413
SYMBOL res -72 -256 R0
SYMATTR InstName R4
SYMATTR Value 10
SYMBOL res -280 -288 R270
SYMATTR InstName R5
SYMATTR Value 5m
SYMBOL cap 520 -128 R270
SYMATTR InstName C1
SYMATTR Value 0.047
SYMBOL voltage -760 -512 R0
SYMATTR InstName V1
SYMATTR Value PULSE(0 5 5m 5m 5m 250m 300m)
SYMBOL voltage -760 -304 R0
SYMATTR InstName V2
SYMATTR Value PULSE(0 3.3 5m 5m 5m 250m 300m)
SYMBOL voltage -728 96 R90
SYMATTR InstName V3
SYMATTR Value PULSE(0 12 5m 5m 5m 400m 450m)
SYMBOL voltage -728 224 R90
SYMATTR InstName V4
SYMATTR Value PULSE(0 -12 5m 5m 5m 400m 450m)
SYMBOL voltage -648 352 R90
SYMATTR InstName V5
SYMATTR Value PWL(0 3.3 40m 3.3 +1u 0)
SYMBOL voltage -520 512 R90
SYMATTR InstName V6
SYMATTR Value 12
SYMBOL res -488 320 R0
SYMATTR InstName R6
SYMATTR Value 10K
SYMBOL cap 696 -288 R0
SYMATTR InstName C2
SYMATTR Value 30
SYMATTR SpiceLine Rser=10m
SYMBOL cap 696 48 R0
SYMATTR InstName C3
SYMATTR Value 10
SYMATTR SpiceLine Rser=10m
SYMBOL cap 696 256 R0
SYMATTR InstName C4
SYMATTR Value 10
SYMATTR SpiceLine Rser=10m
SYMBOL cap 504 272 R270
SYMATTR InstName C5
SYMATTR Value 0.1
SYMBOL cap 696 -496 R0
SYMATTR InstName C6
SYMATTR Value 30
SYMATTR SpiceLine Rser=10m
SYMBOL res -408 400 R0
SYMATTR InstName R7
SYMATTR Value 10K
SYMBOL LTC1643AL 56 160 R0
SYMATTR InstName U1
SYMBOL res 824 -512 R0
SYMATTR InstName Rload1
SYMATTR Value 1
SYMBOL res 824 -304 R0
SYMATTR InstName Rload2
SYMATTR Value 0.87
SYMBOL res 824 32 R0
SYMATTR InstName Rload3
SYMATTR Value 30
SYMBOL res 824 240 R0
SYMATTR InstName Rload4
SYMATTR Value 150