* SPICE netlist
V1 N004 0 PULSE(0 5.5 10m 1m 1m 10 20)
V2 N016 0 PULSE(0 3.8 20m 1m 1m 10 20)
V3 N026 0 PULSE(0 3.5 27m 1m 1m 10 20)
MQ1 N024 N027 N025 N025 Si2316DS
MQ2 N020 N022 N021 N021 Si2316DS
MQ3 N014 N017 N015 N015 Si2316DS
C1 N007 0 .47
R1 N015 _RESET 4.7K
C2 N038 0 .22
R2 N014 N031 178K
R3 N010 N030 232K
R4 N014 N018 100
C3 N014 0 10
C4 N001 N009 .01
C5 N010 N019 .01
C6 N020 0 10
XU1 N010 N013 0 N019 N016 MP_01 MP_02 N016 LT1763-3.3 ;pnba OUT)Sense)GND)BYP)_SHDN)))IN
C7 N024 0 10
C8 N014 N029 .01
XU2 N014 N018 0 N029 N026 MP_03 MP_04 N026 LT1763-2.5 ;pnba OUT)Sense)GND)BYP)_SHDN)))IN
MQ4 N030 N039 0 0 BSS123
V4 N039 0 PULSE(0 5 2.5 100n 100n 200u 100)
C9 N015 0 10
C10 N021 0 10
C11 N025 0 10
V5 N005 0 PULSE(0 1 2 100n 100n 100u 100)
S1 0 N003 N005 0 SSHRT
MQ5 N010 N012 N011 N011 Si2316DS
R5 N010 N013 100
C12 N010 0 10
C13 N011 0 10
MQ6 N002 N008 N003 N003 Si2316DS
R6 N002 N001 50m
R7 N001 N006 100
C14 N001 0 10
C15 N003 0 10
R8 N020 N033 113K
R9 N033 0 49.9K
R10 N024 N035 86.6K
R11 N035 0 49.9K
R12 N031 0 49.9K
R13 N030 0 49.9K
V6 N032 0 PULSE(0 2.5 27m 1m 1m 10 20)
C16 N020 N034 .01
R14 N020 N023 100
V7 N036 0 PULSE(0 2.5 27m 1m 1m 10 20)
C17 N024 N037 .01
R15 N024 N028 100
R16 N008 N007 10
R17 N012 N007 10
R18 N017 N007 10
R19 N022 N007 10
R20 N027 N007 10
XU3 N020 N023 0 N034 N032 MP_05 MP_06 N032 LT1763-1.8 ;pnba OUT)Sense)GND)BYP)_SHDN)))IN
XU4 N024 N028 0 N037 N036 MP_07 MP_08 N036 LT1763-1.5 ;pnba OUT)Sense)GND)BYP)_SHDN)))IN
XU5 N030 N031 N033 N035 N023 N021 N018 N015 N013 N011 0 _RESET N007 N002 N001 N038 N006 N003 N028 N025 LTC2922-3.3 ;pnba V1)V2)V3)V4)S3)D3)S2)D2)S1)D1)Gnd)PG)Gate)Sense)Vcc)Timer)S0)D0)S4)D4
XU6 N001 N006 0 N009 N004 MP_09 MP_10 N004 LT1763-3.3 ;pnba OUT)Sense)GND)BYP)_SHDN)))IN
Rload4 N025 0 70
Rload3 N021 0 70
Rload2 N015 0 70
Rload1 N011 0 70
Rload0 N003 0 70
.tran 4

* LTspice schematic (.asc)
Version 4
SHEET 1 3984 1792
WIRE -1224 -880 -1384 -880
WIRE -504 -880 -1224 -880
WIRE -408 -880 -504 -880
WIRE 216 -880 -408 -880
WIRE 248 -880 216 -880
WIRE 344 -880 328 -880
WIRE 552 -880 344 -880
WIRE 904 -880 648 -880
WIRE 1288 -880 904 -880
WIRE 1416 -880 1288 -880
WIRE 1592 -880 1416 -880
WIRE -1944 -864 -1992 -864
WIRE -1704 -864 -1864 -864
WIRE -1672 -864 -1704 -864
WIRE -504 -864 -504 -880
WIRE -408 -864 -408 -880
WIRE 1288 -864 1288 -880
WIRE 1416 -864 1416 -880
WIRE 1592 -864 1592 -880
WIRE 1864 -848 1640 -848
WIRE 1992 -848 1944 -848
WIRE -616 -816 -1384 -816
WIRE 1656 -800 1640 -800
WIRE -408 -784 -408 -800
WIRE 520 -784 488 -784
WIRE 632 -784 632 -832
WIRE 632 -784 600 -784
WIRE -1704 -768 -1704 -864
WIRE -1672 -768 -1704 -768
WIRE 1288 -768 1288 -800
WIRE 1416 -768 1416 -784
WIRE 1592 -768 1592 -784
WIRE -1336 -752 -1384 -752
WIRE -1224 -752 -1224 -880
WIRE -1224 -752 -1272 -752
WIRE -616 -752 -616 -816
WIRE -504 -752 -504 -784
WIRE -504 -752 -616 -752
WIRE -584 -704 -1224 -704
WIRE -408 -704 -584 -704
WIRE -312 -704 -408 -704
WIRE 552 -704 -312 -704
WIRE 984 -704 648 -704
WIRE 1288 -704 984 -704
WIRE 1416 -704 1288 -704
WIRE -584 -688 -584 -704
WIRE -408 -688 -408 -704
WIRE 1288 -688 1288 -704
WIRE 1416 -688 1416 -704
WIRE -1528 -672 -1528 -704
WIRE -408 -608 -408 -624
WIRE 488 -608 488 -784
WIRE 536 -608 488 -608
WIRE 632 -608 632 -656
WIRE 632 -608 616 -608
WIRE -584 -592 -584 -608
WIRE -584 -592 -1192 -592
WIRE 1288 -592 1288 -624
WIRE 1416 -592 1416 -608
WIRE -1224 -544 -1224 -704
WIRE -1224 -544 -1384 -544
WIRE -664 -544 -1160 -544
WIRE -408 -544 -664 -544
WIRE -184 -544 -408 -544
WIRE 552 -544 -184 -544
WIRE 1064 -544 648 -544
WIRE 1288 -544 1064 -544
WIRE 1416 -544 1288 -544
WIRE -1944 -528 -1992 -528
WIRE -1704 -528 -1864 -528
WIRE -1672 -528 -1704 -528
WIRE -664 -528 -664 -544
WIRE -408 -528 -408 -544
WIRE 1288 -528 1288 -544
WIRE 1416 -528 1416 -544
WIRE -1192 -480 -1192 -592
WIRE -1192 -480 -1384 -480
WIRE -408 -448 -408 -464
WIRE 488 -448 488 -608
WIRE 536 -448 488 -448
WIRE 632 -448 632 -496
WIRE 632 -448 616 -448
WIRE -1704 -432 -1704 -528
WIRE -1672 -432 -1704 -432
WIRE -664 -432 -664 -448
WIRE -664 -432 -1128 -432
WIRE 1288 -432 1288 -464
WIRE 1416 -432 1416 -448
WIRE -1336 -416 -1384 -416
WIRE -1224 -416 -1224 -544
WIRE -1224 -416 -1272 -416
WIRE -744 -384 -1064 -384
WIRE -408 -384 -744 -384
WIRE -88 -384 -408 -384
WIRE 552 -384 -88 -384
WIRE 1144 -384 648 -384
WIRE 1288 -384 1144 -384
WIRE 1416 -384 1288 -384
WIRE -744 -368 -744 -384
WIRE 1288 -368 1288 -384
WIRE 1416 -368 1416 -384
WIRE -408 -352 -408 -384
WIRE -1528 -336 -1528 -368
WIRE 488 -288 488 -448
WIRE 520 -288 488 -288
WIRE 632 -288 632 -336
WIRE 632 -288 600 -288
WIRE -744 -272 -744 -288
WIRE -744 -272 -1032 -272
WIRE -408 -272 -408 -288
WIRE 1288 -272 1288 -304
WIRE 1416 -272 1416 -288
WIRE -824 -224 -968 -224
WIRE -408 -224 -824 -224
WIRE 24 -224 -408 -224
WIRE 552 -224 24 -224
WIRE 1224 -224 648 -224
WIRE 1288 -224 1224 -224
WIRE 1416 -224 1288 -224
WIRE -1224 -208 -1384 -208
WIRE -1160 -208 -1160 -544
WIRE -1160 -208 -1224 -208
WIRE -824 -208 -824 -224
WIRE 1288 -208 1288 -224
WIRE 1416 -208 1416 -224
WIRE -1944 -192 -1992 -192
WIRE -1704 -192 -1864 -192
WIRE -1672 -192 -1704 -192
WIRE -408 -192 -408 -224
WIRE -312 -176 -312 -704
WIRE -184 -176 -184 -544
WIRE -1128 -144 -1128 -432
WIRE -1128 -144 -1384 -144
WIRE 488 -128 488 -288
WIRE 520 -128 488 -128
WIRE 632 -128 632 -176
WIRE 632 -128 600 -128
WIRE -824 -112 -824 -128
WIRE -824 -112 -936 -112
WIRE -408 -112 -408 -128
WIRE -88 -112 -88 -384
WIRE 24 -112 24 -224
WIRE 1064 -112 1064 -544
WIRE 1064 -112 808 -112
WIRE 1288 -112 1288 -144
WIRE 1416 -112 1416 -128
WIRE -1704 -96 -1704 -192
WIRE -1672 -96 -1704 -96
WIRE -1336 -80 -1384 -80
WIRE -1224 -80 -1224 -208
WIRE -1224 -80 -1272 -80
WIRE 216 -80 216 -880
WIRE 344 -80 344 -880
WIRE 808 -48 808 -112
WIRE -1528 0 -1528 -32
WIRE -312 16 -312 -96
WIRE -312 16 -440 16
WIRE 136 16 -312 16
WIRE 488 16 488 -128
WIRE 488 16 424 16
WIRE 488 48 488 16
WIRE -312 96 -312 16
WIRE -184 96 -184 -96
WIRE 136 96 -184 96
WIRE -1224 112 -1384 112
WIRE -1064 112 -1064 -384
WIRE -1064 112 -1224 112
WIRE -1944 128 -1992 128
WIRE -1704 128 -1864 128
WIRE -1672 128 -1704 128
WIRE -184 128 -184 96
WIRE 488 128 488 112
WIRE -1032 176 -1032 -272
WIRE -1032 176 -1384 176
WIRE -88 176 -88 -32
WIRE 136 176 -88 176
WIRE -1704 224 -1704 128
WIRE -1672 224 -1704 224
WIRE -88 224 -88 176
WIRE -1336 240 -1384 240
WIRE -1224 240 -1224 112
WIRE -1224 240 -1272 240
WIRE 24 256 24 -32
WIRE 136 256 24 256
WIRE 728 256 424 256
WIRE 808 256 808 32
WIRE 808 256 728 256
WIRE -1528 320 -1528 288
WIRE -504 336 -504 -752
WIRE 136 336 -504 336
WIRE 904 336 904 -880
WIRE 904 336 424 336
WIRE -584 416 -584 -592
WIRE 136 416 -584 416
WIRE 984 416 984 -704
WIRE 984 416 424 416
WIRE -1224 432 -1384 432
WIRE -968 432 -968 -224
WIRE -968 432 -1224 432
WIRE -1944 448 -1992 448
WIRE -1704 448 -1864 448
WIRE -1672 448 -1704 448
WIRE -936 496 -936 -112
WIRE -936 496 -1384 496
WIRE -664 496 -664 -432
WIRE 136 496 -664 496
WIRE 1064 496 1064 -112
WIRE 1064 496 424 496
WIRE -1704 544 -1704 448
WIRE -1672 544 -1704 544
WIRE -1336 560 -1384 560
WIRE -1224 560 -1224 432
WIRE -1224 560 -1272 560
WIRE -744 576 -744 -272
WIRE 136 576 -744 576
WIRE 1144 576 1144 -384
WIRE 1144 576 424 576
WIRE -1528 640 -1528 608
WIRE -824 656 -824 -112
WIRE 136 656 -824 656
WIRE 1224 656 1224 -224
WIRE 1224 656 424 656
WIRE -440 704 -440 16
WIRE 216 768 216 752
WIRE 344 768 344 752
WIRE -488 784 -952 784
WIRE -952 800 -952 784
WIRE -440 816 -440 800
WIRE 344 848 344 832
WIRE -952 896 -952 880
FLAG 1592 -768 0
FLAG 1992 -848 0
FLAG 1656 -800 0
FLAG -1992 -528 0
FLAG -1992 -192 0
FLAG -1992 -864 0
FLAG 488 128 0
FLAG 344 848 0
FLAG 216 768 0
FLAG -408 -448 0
FLAG -1528 -672 0
FLAG -1528 -336 0
FLAG -408 -272 0
FLAG -408 -112 0
FLAG -1528 0 0
FLAG 728 256 _RESET
FLAG -440 816 0
FLAG -952 896 0
FLAG 1288 -432 0
FLAG 1288 -272 0
FLAG 1288 -112 0
FLAG -408 -608 0
FLAG 1288 -592 0
FLAG -408 -784 0
FLAG 1288 -768 0
FLAG -56 256 0
FLAG -168 224 0
FLAG -264 128 0
FLAG -392 96 0
FLAG -1992 128 0
FLAG -1528 320 0
FLAG -1992 448 0
FLAG -1528 640 0
FLAG 1416 -432 0
FLAG 1416 -272 0
FLAG 1416 -112 0
FLAG 1416 -592 0
FLAG 1416 -768 0
SYMBOL voltage -1848 -864 R90
SYMATTR InstName V1
SYMATTR Value PULSE(0 5.5 10m 1m 1m 10 20)
SYMBOL voltage -1848 -528 R90
SYMATTR InstName V2
SYMATTR Value PULSE(0 3.8 20m 1m 1m 10 20)
SYMBOL voltage -1848 -192 R90
SYMATTR InstName V3
SYMATTR Value PULSE(0 3.5 27m 1m 1m 10 20)
SYMBOL nmos 552 -176 R270
SYMATTR InstName Q1
SYMATTR Value Si2316DS
SYMBOL nmos 552 -336 R270
SYMATTR InstName Q2
SYMATTR Value Si2316DS
SYMBOL nmos 552 -496 R270
SYMATTR InstName Q3
SYMATTR Value Si2316DS
SYMBOL cap 472 48 R0
SYMATTR InstName C1
SYMATTR Value .47
SYMBOL res 792 -64 R0
SYMATTR InstName R1
SYMATTR Value 4.7K
SYMBOL cap 328 768 R0
SYMATTR InstName C2
SYMATTR Value .22
SYMBOL res -200 -192 R0
SYMATTR InstName R2
SYMATTR Value 178K
SYMBOL res -328 -192 R0
SYMATTR InstName R3
SYMATTR Value 232K
SYMBOL res -680 -544 R0
SYMATTR InstName R4
SYMATTR Value 100
SYMBOL cap -424 -528 R0
SYMATTR InstName C3
SYMATTR Value 10
SYMBOL cap -1272 -768 R90
SYMATTR InstName C4
SYMATTR Value .01
SYMBOL cap -1272 -432 R90
SYMATTR InstName C5
SYMATTR Value .01
SYMBOL cap -424 -352 R0
SYMATTR InstName C6
SYMATTR Value 10
SYMBOL PowerProducts\\LT1763-3.3 -1528 -480 R0
SYMATTR InstName U1
SYMBOL cap -424 -192 R0
SYMATTR InstName C7
SYMATTR Value 10
SYMBOL cap -1272 -96 R90
SYMATTR InstName C8
SYMATTR Value .01
SYMBOL PowerProducts\\LT1763-2.5 -1528 -144 R0
SYMATTR InstName U2
SYMBOL nmos -488 704 R0
SYMATTR InstName Q4
SYMATTR Value BSS123
SYMBOL voltage -952 784 R0
SYMATTR InstName V4
SYMATTR Value PULSE(0 5 2.5 100n 100n 200u 100)
SYMBOL cap 1272 -528 R0
SYMATTR InstName C9
SYMATTR Value 10
SYMBOL cap 1272 -368 R0
SYMATTR InstName C10
SYMATTR Value 10
SYMBOL cap 1272 -208 R0
SYMATTR InstName C11
SYMATTR Value 10
SYMBOL voltage 1848 -848 R270
SYMATTR InstName V5
SYMATTR Value PULSE(0 1 2 100n 100n 100u 100)
SYMBOL sw 1592 -768 R180
SYMATTR InstName S1
SYMATTR Value SSHRT
SYMBOL nmos 552 -656 R270
SYMATTR InstName Q5
SYMATTR Value Si2316DS
SYMBOL res -600 -704 R0
SYMATTR InstName R5
SYMATTR Value 100
SYMBOL cap -424 -688 R0
SYMATTR InstName C12
SYMATTR Value 10
SYMBOL cap 1272 -688 R0
SYMATTR InstName C13
SYMATTR Value 10
SYMBOL nmos 552 -832 R270
SYMATTR InstName Q6
SYMATTR Value Si2316DS
SYMBOL res 344 -896 R90
SYMATTR InstName R6
SYMATTR Value 50m
SYMBOL res -520 -880 R0
SYMATTR InstName R7
SYMATTR Value 100
SYMBOL cap -424 -864 R0
SYMATTR InstName C14
SYMATTR Value 10
SYMBOL cap 1272 -864 R0
SYMATTR InstName C15
SYMATTR Value 10
SYMBOL res -104 -128 R0
SYMATTR InstName R8
SYMATTR Value 113K
SYMBOL res -72 208 R90
SYMATTR InstName R9
SYMATTR Value 49.9K
SYMBOL res 8 -128 R0
SYMATTR InstName R10
SYMATTR Value 86.6K
SYMBOL res 40 240 R90
SYMATTR InstName R11
SYMATTR Value 49.9K
SYMBOL res -168 112 R90
SYMATTR InstName R12
SYMATTR Value 49.9K
SYMBOL res -296 80 R90
SYMATTR InstName R13
SYMATTR Value 49.9K
SYMBOL voltage -1848 128 R90
SYMATTR InstName V6
SYMATTR Value PULSE(0 2.5 27m 1m 1m 10 20)
SYMBOL cap -1272 224 R90
SYMATTR InstName C16
SYMATTR Value .01
SYMBOL res -760 -384 R0
SYMATTR InstName R14
SYMATTR Value 100
SYMBOL voltage -1848 448 R90
SYMATTR InstName V7
SYMATTR Value PULSE(0 2.5 27m 1m 1m 10 20)
SYMBOL cap -1272 544 R90
SYMATTR InstName C17
SYMATTR Value .01
SYMBOL res -840 -224 R0
SYMATTR InstName R15
SYMATTR Value 100
SYMBOL res 616 -800 R90
SYMATTR InstName R16
SYMATTR Value 10
SYMBOL res 632 -624 R90
SYMATTR InstName R17
SYMATTR Value 10
SYMBOL res 632 -464 R90
SYMATTR InstName R18
SYMATTR Value 10
SYMBOL res 616 -304 R90
SYMATTR InstName R19
SYMATTR Value 10
SYMBOL res 616 -144 R90
SYMATTR InstName R20
SYMATTR Value 10
SYMBOL PowerProducts\\LT1763-1.8 -1528 176 R0
SYMATTR InstName U3
SYMBOL PowerProducts\\LT1763-1.5 -1528 496 R0
SYMATTR InstName U4
SYMBOL LTC2922-3.3 280 336 R0
SYMATTR InstName U5
SYMBOL PowerProducts\\LT1763-3.3 -1528 -816 R0
SYMATTR InstName U6
SYMBOL res 1400 -224 R0
SYMATTR InstName Rload4
SYMATTR Value 70
SYMBOL res 1400 -384 R0
SYMATTR InstName Rload3
SYMATTR Value 70
SYMBOL res 1400 -544 R0
SYMATTR InstName Rload2
SYMATTR Value 70
SYMBOL res 1400 -704 R0
SYMATTR InstName Rload1
SYMATTR Value 70
SYMBOL res 1400 -880 R0
SYMATTR InstName Rload0
SYMATTR Value 70