* SPICE netlist
Rsense5 5Vin N001 7m
R10 N002 N007 10
R2 N008 N007 1K
M1 N003 N004 3Vout 3Vout IRF7413
R3 N004 N007 10
Rsense3 3Vin N003 5m
C7 N008 0 0.01
V9 5Vin 0 PULSE(0 5 5m 5m 5m 400m 500m)
V1 3Vin 0 PULSE(0 3.3 5m 5m 5m 400m 500m)
V11 N013 0 PWL(0 3.3 40m 3.3 +1u 0 0.17 0 +1u 3.3 +10m 3.3 +1u 0 0.31 0 +1u 3.3 +10m 3.3 +1u 0)
V12 N014 0 3.3
R4 N015 N014 3K
C1 3Vout 0 30
R5 3Vout 0 0.8
C5 N017 0 0.1
R1 5Vout 0 2
C2 5Vout 0 30
R6 N018 N014 3K
XU1 N012 N016 N015 N018 5Vout 0 3Vout 3Vin N003 N007 N001 5Vin N005 N009 N013 N010 LTC1646 ;pnba _ResetOUT)Timer)_Fault)_PWRGD)5Vout)GND)3Vout)3Vin)3Vsense)Gate)5Vsense)5Vin)Precharge)Drive)_ON)_ResetIN
V5 N010 0 PWL(0 0 10m 0 +1u 3.3)
R7 N012 3Vout 3K
R8 N011 N009 18
C3 0 N011 4.7n
Q2 N006 N009 N005 0 2N2222
R14 3Vin N006 12
R15 3Vin N009 1K
R16 N005 0 18
R9 N017 N016 10K
M2 N001 N002 5Vout 5Vout IRF7413
.tran 0.65

* LTspice schematic (.asc)
Version 4
SHEET 1 2016 1088
WIRE 288 -544 -624 -544
WIRE 304 -544 288 -544
WIRE 400 -544 384 -544
WIRE 464 -544 400 -544
WIRE 720 -544 560 -544
WIRE 848 -544 720 -544
WIRE 1008 -544 848 -544
WIRE -624 -528 -624 -544
WIRE 720 -528 720 -544
WIRE 848 -528 848 -544
WIRE 544 -448 544 -496
WIRE -624 -432 -624 -448
WIRE 720 -432 720 -464
WIRE 848 -432 848 -448
WIRE -160 -304 -624 -304
WIRE -144 -304 -160 -304
WIRE -48 -304 -64 -304
WIRE -16 -304 -48 -304
WIRE 176 -304 80 -304
WIRE 720 -304 176 -304
WIRE 848 -304 720 -304
WIRE 944 -304 848 -304
WIRE -624 -288 -624 -304
WIRE 720 -288 720 -304
WIRE 848 -288 848 -304
WIRE 64 -208 64 -256
WIRE -624 -192 -624 -208
WIRE 720 -192 720 -224
WIRE 848 -192 848 -208
WIRE -480 -80 -592 -80
WIRE -448 -80 -480 -80
WIRE -272 -80 -352 -80
WIRE -160 -80 -160 -304
WIRE -160 -80 -192 -80
WIRE 64 -80 64 -128
WIRE 544 -80 544 -368
WIRE 544 -80 64 -80
WIRE 592 -80 544 -80
WIRE 720 -80 672 -80
WIRE -592 -64 -592 -80
WIRE 720 -64 720 -80
WIRE -400 16 -400 -16
WIRE -320 16 -400 16
WIRE -160 16 -160 -80
WIRE -160 16 -240 16
WIRE 720 16 720 0
WIRE -592 32 -592 16
WIRE 1008 48 1008 -544
WIRE 1008 48 528 48
WIRE -400 80 -400 16
WIRE 640 80 -400 80
WIRE -160 112 -160 16
WIRE -48 112 -48 -304
WIRE 64 112 64 -80
WIRE 176 112 176 -304
WIRE 288 112 288 -544
WIRE 400 112 400 -544
WIRE 528 112 528 48
WIRE -240 192 -288 192
WIRE 944 192 944 -304
WIRE -992 224 -1008 224
WIRE -656 224 -912 224
WIRE 640 224 640 80
WIRE 640 224 608 224
WIRE 672 224 640 224
WIRE 768 224 752 224
WIRE 848 224 832 224
WIRE -480 256 -480 -80
WIRE -240 256 -480 256
WIRE -656 320 -656 224
WIRE -240 320 -656 320
WIRE 944 336 944 272
WIRE 944 336 608 336
WIRE -992 384 -1008 384
WIRE -240 384 -912 384
WIRE -400 448 -416 448
WIRE -240 448 -320 448
WIRE 640 448 608 448
WIRE 752 448 720 448
WIRE 752 464 752 448
WIRE -992 512 -1008 512
WIRE -416 512 -416 448
WIRE -416 512 -912 512
WIRE -336 512 -416 512
WIRE -240 512 -256 512
WIRE 752 544 752 528
FLAG 720 -432 0
FLAG 848 -432 0
FLAG 720 16 0
FLAG -1008 384 0
FLAG -624 -432 0
FLAG 720 -192 0
FLAG 848 -192 0
FLAG -624 -192 0
FLAG -1008 512 0
FLAG 752 544 0
FLAG -288 192 0
FLAG 848 -544 5Vout
FLAG 848 -304 3Vout
FLAG -624 -304 3Vin
FLAG -624 -544 5Vin
FLAG -1008 224 0
FLAG 848 224 0
FLAG -592 32 0
SYMBOL res 288 -528 R270
SYMATTR InstName Rsense5
SYMATTR Value 7m
SYMBOL res 528 -464 R0
SYMATTR InstName R10
SYMATTR Value 10
SYMBOL res 688 -96 R90
SYMATTR InstName R2
SYMATTR Value 1K
SYMBOL nmos -16 -256 R270
SYMATTR InstName M1
SYMATTR Value IRF7413
SYMBOL res 48 -224 R0
SYMATTR InstName R3
SYMATTR Value 10
SYMBOL res -160 -288 R270
SYMATTR InstName Rsense3
SYMATTR Value 5m
SYMBOL cap 704 -64 R0
SYMATTR InstName C7
SYMATTR Value 0.01
SYMBOL voltage -624 -544 R0
SYMATTR InstName V9
SYMATTR Value PULSE(0 5 5m 5m 5m 400m 500m)
SYMBOL voltage -624 -304 R0
SYMATTR InstName V1
SYMATTR Value PULSE(0 3.3 5m 5m 5m 400m 500m)
SYMBOL voltage -896 384 R90
SYMATTR InstName V11
SYMATTR Value PWL(0 3.3 40m 3.3 +1u 0 0.17 0 +1u 3.3 +10m 3.3 +1u 0 0.31 0 +1u 3.3 +10m 3.3 +1u 0)
SYMBOL voltage -896 512 R90
SYMATTR InstName V12
SYMATTR Value 3.3
SYMBOL res -304 432 R90
SYMATTR InstName R4
SYMATTR Value 3K
SYMBOL cap 704 -288 R0
SYMATTR InstName C1
SYMATTR Value 30
SYMBOL res 832 -304 R0
SYMATTR InstName R5
SYMATTR Value 0.8
SYMBOL cap 736 464 R0
SYMATTR InstName C5
SYMATTR Value 0.1
SYMBOL res 832 -544 R0
SYMATTR InstName R1
SYMATTR Value 2
SYMBOL cap 704 -528 R0
SYMATTR InstName C2
SYMATTR Value 30
SYMBOL res -240 496 R90
SYMATTR InstName R6
SYMATTR Value 3K
SYMBOL LTC1646 176 336 R0
SYMATTR InstName U1
SYMBOL voltage -896 224 R90
SYMATTR InstName V5
SYMATTR Value PWL(0 0 10m 0 +1u 3.3)
SYMBOL res 928 288 M180
SYMATTR InstName R7
SYMATTR Value 3K
SYMBOL res 768 208 R90
SYMATTR InstName R8
SYMATTR Value 18
SYMBOL cap 832 208 R90
SYMATTR InstName C3
SYMATTR Value 4.7n
SYMBOL npn -352 -16 M270
SYMATTR InstName Q2
SYMATTR Value 2N2222
SYMBOL res -176 -96 R90
SYMATTR InstName R14
SYMATTR Value 12
SYMBOL res -224 0 R90
SYMATTR InstName R15
SYMATTR Value 1K
SYMBOL res -608 -80 R0
SYMATTR InstName R16
SYMATTR Value 18
SYMBOL res 736 432 R90
SYMATTR InstName R9
SYMATTR Value 10K
SYMBOL nmos 464 -496 R270
SYMATTR InstName M2
SYMATTR Value IRF7413