* SPICE netlist
V1 IN 0 8.4
R1 IN N003 2150K
R2 N003 N008 23.2K
R3 N008 0 196K
C1 OUT 0 1
R4 IN N016 100K
MQ1 N016 N017 0 0 2N7002
R5 IN N004 100K
R6 N007 0 100K
R7 OUT N007 499K
R8 OUT N010 100K
R9 OUT N013 100K
R10 OUT N015 100K
C2 N014 0 1
V2 N012 0 PWL(0 0 2.8 0 2.801 3.3 3 3.3 3.001 0 4 0 4.001 3.3 6 3.3 6.001 0 6.499 0 6.5 3.3 9 3.3 9.001 0 12.999 0 13 3.3 14 3.3 14.001 0 14.499 0 14.5 3.3)
MQ2 N001 N005 IN IN FDS4435A
R11 N005 N004 100K
V3 N017 0 PWL(0 0 15.999 0 16 5 17 5 17.001 0)
Rload OUT 0 100
MQ3 N001 N002 OUT OUT IRF530
R14 N002 N006 10
D1 OUT N006 BZX84C15L
C3 N006 0 10n Rser=1K
R12 OUT N011 23K
R13 N011 0 10K
V4 N009 0 1
G1 0 N006 N009 N011 0.01
S1 0 N006 N001 0 SDHN
C4 OUT 0 30
XU1 0 N007 N016 N014 N012 IN N003 N008 N013 N010 N004 N015 LTC2953-2 ;pnba GND)VM)_KILL)PDT)_PB)VIN)UVLO)_PFI)_PFO)_RST)_EN)_INT
.tran 20 startup

* LTspice schematic (.asc)
Version 4
SHEET 1 2064 1056
WIRE -840 -528 -936 -528
WIRE -744 -528 -840 -528
WIRE -472 -528 -744 -528
WIRE -296 -528 -472 -528
WIRE -136 -528 -296 -528
WIRE 40 -528 -40 -528
WIRE 168 -528 40 -528
WIRE 456 -528 264 -528
WIRE 600 -528 456 -528
WIRE 680 -528 600 -528
WIRE 760 -528 680 -528
WIRE 872 -528 760 -528
WIRE 920 -528 872 -528
WIRE 1032 -528 920 -528
WIRE -936 -512 -936 -528
WIRE -296 -512 -296 -528
WIRE -744 -496 -744 -528
WIRE 680 -496 680 -528
WIRE 920 -496 920 -528
WIRE 1032 -496 1032 -528
WIRE 456 -480 456 -528
WIRE -472 -464 -472 -528
WIRE 248 -464 248 -480
WIRE -936 -416 -936 -432
WIRE -744 -400 -744 -416
WIRE -616 -400 -744 -400
WIRE -296 -400 -296 -432
WIRE -296 -400 -328 -400
WIRE -216 -400 -296 -400
WIRE -120 -400 -120 -480
WIRE -120 -400 -136 -400
WIRE 680 -400 680 -432
WIRE 920 -400 920 -432
WIRE 1032 -400 1032 -416
WIRE -744 -368 -744 -400
WIRE 248 -368 248 -384
WIRE 456 -368 456 -416
WIRE 456 -368 248 -368
WIRE 456 -352 456 -368
WIRE -136 -288 -328 -288
WIRE -744 -256 -744 -288
WIRE -616 -256 -744 -256
WIRE 248 -256 248 -368
WIRE 248 -256 104 -256
WIRE 456 -256 456 -288
WIRE 600 -256 600 -528
WIRE -744 -240 -744 -256
WIRE 104 -224 104 -256
WIRE 40 -208 40 -528
WIRE 56 -208 40 -208
WIRE 248 -208 248 -256
WIRE 328 -192 296 -192
WIRE 456 -192 408 -192
WIRE -296 -176 -328 -176
WIRE -200 -176 -216 -176
WIRE 56 -160 40 -160
WIRE -744 -144 -744 -160
WIRE 600 -144 600 -176
WIRE 600 -144 296 -144
WIRE 600 -128 600 -144
WIRE -616 -112 -1032 -112
WIRE 40 -112 40 -160
WIRE 104 -112 104 -144
WIRE 104 -112 40 -112
WIRE 104 -96 104 -112
WIRE 248 -96 248 -128
WIRE 760 -80 760 -528
WIRE -296 -64 -328 -64
WIRE -200 -64 -200 -176
WIRE -200 -64 -216 -64
WIRE 600 -32 600 -48
WIRE -136 16 -136 -288
WIRE 760 16 760 0
WIRE 760 16 -136 16
WIRE -696 32 -712 32
WIRE -616 32 -632 32
WIRE 760 32 760 16
WIRE -296 48 -328 48
WIRE -200 48 -200 -64
WIRE -200 48 -216 48
WIRE -840 96 -840 -528
WIRE 760 128 760 112
WIRE -200 160 -200 48
WIRE 872 160 872 -528
WIRE 872 160 -200 160
WIRE -536 176 -536 160
WIRE -840 208 -840 176
WIRE -408 208 -408 160
WIRE -408 208 -840 208
WIRE -840 240 -840 208
WIRE -648 320 -792 320
WIRE -648 336 -648 320
WIRE -840 368 -840 336
WIRE -1032 432 -1032 -112
WIRE -648 432 -648 416
WIRE -1032 528 -1032 512
FLAG -936 -416 0
FLAG -936 -528 IN
FLAG -744 -144 0
FLAG 920 -400 0
FLAG 1032 -400 0
FLAG 1032 -528 OUT
FLAG -536 176 0
FLAG -1032 528 0
FLAG -840 368 0
FLAG -648 432 0
FLAG 760 128 0
FLAG -712 32 0
FLAG 680 -400 0
FLAG 600 -32 0
FLAG 456 -256 0
FLAG 248 -96 0
FLAG 456 -192 0
FLAG 104 -96 0
SYMBOL voltage -936 -528 R0
SYMATTR Value 8.4
SYMATTR InstName V1
SYMBOL res -760 -512 R0
SYMATTR InstName R1
SYMATTR Value 2150K
SYMBOL res -760 -384 R0
SYMATTR InstName R2
SYMATTR Value 23.2K
SYMBOL res -760 -256 R0
SYMATTR InstName R3
SYMATTR Value 196K
SYMBOL cap 904 -496 R0
SYMATTR InstName C1
SYMATTR Value 1
SYMBOL res -856 80 R0
SYMATTR InstName R4
SYMATTR Value 100K
SYMBOL nmos -792 240 M0
SYMATTR InstName Q1
SYMATTR Value 2N7002
SYMBOL res -312 -528 R0
SYMATTR InstName R5
SYMATTR Value 100K
SYMBOL res 744 16 R0
SYMATTR InstName R6
SYMATTR Value 100K
SYMBOL res 744 -96 R0
SYMATTR InstName R7
SYMATTR Value 499K
SYMBOL res -200 -192 R90
SYMATTR InstName R8
SYMATTR Value 100K
SYMBOL res -200 -80 R90
SYMATTR InstName R9
SYMATTR Value 100K
SYMBOL res -200 32 R90
SYMATTR InstName R10
SYMATTR Value 100K
SYMBOL cap -632 16 R90
SYMATTR InstName C2
SYMATTR Value 1
SYMBOL voltage -1032 416 R0
SYMATTR Value PWL(0 0 2.8 0 2.801 3.3 3 3.3 3.001 0 4 0 4.001 3.3 6 3.3 6.001 0 6.499 0 6.5 3.3 9 3.3 9.001 0 12.999 0 13 3.3 14 3.3 14.001 0 14.499 0 14.5 3.3)
SYMATTR InstName V2
SYMBOL pmos -40 -480 M270
SYMATTR InstName Q2
SYMATTR Value FDS4435A
SYMBOL res -120 -416 R90
SYMATTR InstName R11
SYMATTR Value 100K
SYMBOL voltage -648 320 R0
SYMATTR InstName V3
SYMATTR Value PWL(0 0 15.999 0 16 5 17 5 17.001 0)
SYMBOL res 1016 -512 R0
SYMATTR InstName Rload
SYMATTR Value 100
SYMBOL nmos 168 -480 R270
SYMATTR InstName Q3
SYMATTR Value IRF530
SYMBOL res 232 -480 R0
SYMATTR InstName R14
SYMATTR Value 10
SYMBOL diode 440 -480 R0
SYMATTR InstName D1
SYMATTR Value BZX84C15L
SYMBOL cap 440 -352 R0
SYMATTR SpiceLine Rser=1K
SYMATTR InstName C3
SYMATTR Value 10n
SYMBOL res 584 -272 R0
SYMATTR InstName R12
SYMATTR Value 23K
SYMBOL res 584 -144 R0
SYMATTR InstName R13
SYMATTR Value 10K
SYMBOL voltage 312 -192 R270
SYMATTR InstName V4
SYMATTR Value 1
SYMBOL g 248 -224 M0
SYMATTR InstName G1
SYMATTR Value 0.01
SYMBOL sw 104 -128 M180
SYMATTR InstName S1
SYMATTR Value SDHN
SYMBOL cap 664 -496 R0
SYMATTR InstName C4
SYMATTR Value 30
SYMBOL LTC2953-2 -472 -176 R0
SYMATTR InstName U1