* SPICE netlist
R1 N009 0 226K tol=1 pwr=0.1
R2 N007 N009 60.4K tol=1 pwr=0.1
R3 IN1 N007 1Meg tol=1 pwr=0.1
R4 N013 0 78.7K
R5 N012 N013 33.2K
R6 IN2 N012 1Meg
R7 OUT N006 1Meg
C1 OUT N004 47n
R11 N004 N005 698
D1 N005 N004 BAT46WJ
R12 OUT N008 1Meg
MQ1 IN1 N002 N001 N001 FDS4465
C2 OUT 0 100 V=25 Irms=2.4 Rser=0.05 Lser=0 mfg="KEMET" pn="T510E107K025AS" type="Tantalum"
V1 IN2 0 PWL(0 0 300m 13.8)
MQ2 OUT N002 N001 N001 FDS4465
MQ3 IN2 N004 N003 N003 FDS4465
MQ4 OUT N004 N003 N003 FDS4465
V3 IN1 0 PWL(0 0 100m 5 500m 5 +1.7m 2.7 +4m .8 +6m 0)
XU1 N015 N007 N009 N012 N013 N006 N008 0 N010 N011 N005 N003 N002 N001 OUT IN2 IN1 N011 N011 N014 LTC4418 ;pnba TMR)UV1)OV1)UV2)OV2)_VALID1)_VALID2)GND)CAS)IntVcc)G2)VS2)G1)VS1)Vout)V2)V1)EN)_SHDN)HYS
R8 N014 0 255K
C3 N015 0 1n
C4 N011 0 100n
Rload OUT 0 5
C5 N001 0 100n
C6 N003 0 470n
.tran 1

* LTspice schematic (.asc)
Version 4
SHEET 1 1696 1408
WIRE -192 -704 -848 -704
WIRE -112 -704 -192 -704
WIRE 0 -704 -16 -704
WIRE 80 -704 0 -704
WIRE 624 -704 176 -704
WIRE 720 -704 624 -704
WIRE 848 -704 720 -704
WIRE -848 -688 -848 -704
WIRE 720 -688 720 -704
WIRE 848 -688 848 -704
WIRE -32 -640 -32 -656
WIRE 80 -640 -32 -640
WIRE 96 -640 96 -656
WIRE 96 -640 80 -640
WIRE -848 -592 -848 -608
WIRE 720 -592 720 -624
WIRE 848 -592 848 -608
WIRE -256 -528 -848 -528
WIRE 160 -528 -256 -528
WIRE 272 -528 256 -528
WIRE 352 -528 272 -528
WIRE 480 -528 448 -528
WIRE 624 -528 624 -704
WIRE 624 -528 480 -528
WIRE -848 -512 -848 -528
WIRE 480 -496 480 -528
WIRE 240 -464 240 -480
WIRE 352 -464 240 -464
WIRE 368 -464 368 -480
WIRE 368 -464 352 -464
WIRE -848 -416 -848 -432
WIRE 352 -416 352 -464
WIRE 480 -416 480 -432
WIRE 480 -416 352 -416
WIRE 352 -384 352 -416
WIRE 480 -384 480 -416
WIRE 272 -368 272 -528
WIRE 272 -368 176 -368
WIRE 0 -352 0 -704
WIRE 0 -352 -112 -352
WIRE 176 -352 176 -368
WIRE -112 -336 -112 -352
WIRE 352 -288 352 -304
WIRE 480 -288 480 -320
WIRE 480 -288 352 -288
WIRE 176 -272 176 -288
WIRE -112 -256 -112 -272
WIRE 0 -240 0 -352
WIRE 80 -240 80 -640
WIRE 272 -240 272 -368
WIRE 352 -240 352 -288
WIRE 624 -160 624 -528
WIRE 624 -160 432 -160
WIRE -192 -144 -192 -704
WIRE -80 -144 -192 -144
WIRE -192 -128 -192 -144
WIRE 480 -48 432 -48
WIRE 624 -48 624 -160
WIRE 624 -48 560 -48
WIRE -192 -16 -192 -48
WIRE -80 -16 -192 -16
WIRE -192 16 -192 -16
WIRE 480 64 432 64
WIRE 624 64 624 -48
WIRE 624 64 560 64
WIRE -192 112 -192 96
WIRE -80 112 -192 112
WIRE -192 128 -192 112
WIRE 496 176 432 176
WIRE -256 240 -256 -528
WIRE -80 240 -256 240
WIRE -256 256 -256 240
WIRE 480 288 432 288
WIRE -256 368 -256 336
WIRE -80 368 -256 368
WIRE -256 384 -256 368
WIRE 480 400 480 288
WIRE 480 400 432 400
WIRE -256 496 -256 464
WIRE -80 496 -256 496
WIRE -256 512 -256 496
WIRE 480 512 480 400
WIRE 480 512 432 512
WIRE 480 528 480 512
WIRE -256 608 -256 592
WIRE 0 608 0 592
WIRE 176 608 176 592
WIRE 352 608 352 592
WIRE 480 608 480 592
WIRE 176 704 176 688
WIRE 352 704 352 672
FLAG -848 -592 0
FLAG -848 -416 0
FLAG -192 208 0
FLAG -256 608 0
FLAG 0 608 0
FLAG 720 -592 0
FLAG 176 704 0
FLAG 352 704 0
FLAG 480 608 0
FLAG 848 -592 0
FLAG -848 -704 IN1
FLAG -848 -528 IN2
FLAG 848 -704 OUT
FLAG -112 -256 0
FLAG 176 -272 0
SYMBOL res -208 112 R0
SYMATTR User1 1%
SYMATTR InstName R1
SYMATTR Value 226K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res -208 0 R0
SYMATTR User1 1%
SYMATTR InstName R2
SYMATTR Value 60.4K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res -208 -144 R0
SYMATTR User1 1%
SYMATTR InstName R3
SYMATTR Value 1Meg
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res -272 496 R0
SYMATTR InstName R4
SYMATTR Value 78.7K
SYMBOL res -272 368 R0
SYMATTR InstName R5
SYMATTR Value 33.2K
SYMBOL res -272 240 R0
SYMATTR InstName R6
SYMATTR Value 1Meg
SYMBOL res 576 -64 R90
SYMATTR InstName R7
SYMATTR Value 1Meg
SYMATTR User1 5%
SYMBOL cap 464 -496 R0
SYMATTR InstName C1
SYMATTR Value 47n
SYMBOL res 336 -400 R0
SYMATTR InstName R11
SYMATTR Value 698
SYMBOL schottky 464 -320 M180
SYMATTR InstName D1
SYMATTR Value BAT46WJ
SYMBOL res 576 48 R90
SYMATTR InstName R12
SYMATTR Value 1Meg
SYMATTR User1 5%
SYMBOL pmos -112 -656 R270
SYMATTR InstName Q1
SYMATTR Value FDS4465
SYMBOL polcap 704 -688 R0
SYMATTR Value 100
SYMATTR InstName C2
SYMATTR Description Capacitor
SYMATTR Type cap
SYMATTR SpiceLine V=25 Irms=2.4 Rser=0.05 Lser=0 mfg="KEMET" pn="T510E107K025AS" type="Tantalum"
SYMBOL voltage -848 -528 R0
SYMATTR InstName V1
SYMATTR Value PWL(0 0 300m 13.8)
SYMBOL pmos 176 -656 M270
SYMATTR InstName Q2
SYMATTR Value FDS4465
SYMBOL pmos 160 -480 R270
SYMATTR InstName Q3
SYMATTR Value FDS4465
SYMBOL pmos 448 -480 M270
SYMATTR InstName Q4
SYMATTR Value FDS4465
SYMBOL voltage -848 -704 R0
SYMATTR InstName V3
SYMATTR Value PWL(0 0 100m 5 500m 5 +1.7m 2.7 +4m .8 +6m 0)
SYMBOL LTC4418 176 176 R0
SYMATTR InstName U1
SYMBOL res 160 592 R0
SYMATTR InstName R8
SYMATTR Value 255K
SYMBOL cap 336 608 R0
SYMATTR InstName C3
SYMATTR Value 1n
SYMBOL cap 464 528 R0
SYMATTR InstName C4
SYMATTR Value 100n
SYMBOL res 832 -704 R0
SYMATTR InstName Rload
SYMATTR Value 5
SYMBOL cap -128 -336 R0
SYMATTR InstName C5
SYMATTR Value 100n
SYMBOL cap 160 -352 R0
SYMATTR InstName C6
SYMATTR Value 470n