* 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 N039 0 .22
R2 N014 N031 178K
R3 N010 N030 232K
R4 N014 N018 100
XU1 N001 N006 0 N009 N004 MP_01 MP_02 N004 LT1763-5 ;pnba OUT)Sense)GND)BYP)_SHDN)))IN
C3 N014 0 10
C4 N001 N009 .01
C5 N010 N019 .01
C6 N020 0 10
XU2 N010 N013 0 N019 N016 MP_03 MP_04 N016 LT1763-3.3 ;pnba OUT)Sense)GND)BYP)_SHDN)))IN
C7 N024 0 10
C8 N014 N029 .01
XU3 N014 N018 0 N029 N026 MP_05 MP_06 N026 LT1763-2.5 ;pnba OUT)Sense)GND)BYP)_SHDN)))IN
MQ4 N030 N038 0 0 BSS123
V4 N038 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
XU4 N030 N031 N033 N035 N023 N021 N018 N015 N013 N011 0 _RESET N007 N002 N001 N039 N006 N003 N028 N025 LTC2922 ;pnba V1)V2)V3)V4)S3)D3)S2)D2)S1)D1)Gnd)PG)Gate)Sense)Vcc)Timer)S0)D0)S4)D4
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
XU5 N020 N023 0 N034 N032 MP_07 MP_08 N032 LT1763-1.8 ;pnba OUT)Sense)GND)BYP)_SHDN)))IN
XU6 N024 N028 0 N037 N036 MP_09 MP_10 N036 LT1763-1.5 ;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 4064 1760
WIRE -1264 -864 -1424 -864
WIRE -544 -864 -1264 -864
WIRE -448 -864 -544 -864
WIRE 176 -864 -448 -864
WIRE 208 -864 176 -864
WIRE 304 -864 288 -864
WIRE 512 -864 304 -864
WIRE 864 -864 608 -864
WIRE 1232 -864 864 -864
WIRE 1376 -864 1232 -864
WIRE 1600 -864 1376 -864
WIRE -1984 -848 -2032 -848
WIRE -1744 -848 -1904 -848
WIRE -1712 -848 -1744 -848
WIRE -544 -848 -544 -864
WIRE -448 -848 -448 -864
WIRE 1232 -848 1232 -864
WIRE 1376 -848 1376 -864
WIRE 1600 -848 1600 -864
WIRE 1920 -832 1648 -832
WIRE 2032 -832 2000 -832
WIRE -656 -800 -1424 -800
WIRE 1664 -784 1648 -784
WIRE -448 -768 -448 -784
WIRE 480 -768 448 -768
WIRE 592 -768 592 -816
WIRE 592 -768 560 -768
WIRE -1744 -752 -1744 -848
WIRE -1712 -752 -1744 -752
WIRE 1232 -752 1232 -784
WIRE 1376 -752 1376 -768
WIRE 1600 -752 1600 -768
WIRE -1376 -736 -1424 -736
WIRE -1264 -736 -1264 -864
WIRE -1264 -736 -1312 -736
WIRE -656 -736 -656 -800
WIRE -544 -736 -544 -768
WIRE -544 -736 -656 -736
WIRE -624 -688 -1264 -688
WIRE -448 -688 -624 -688
WIRE -352 -688 -448 -688
WIRE 512 -688 -352 -688
WIRE 944 -688 608 -688
WIRE 1232 -688 944 -688
WIRE 1376 -688 1232 -688
WIRE -624 -672 -624 -688
WIRE -448 -672 -448 -688
WIRE 1232 -672 1232 -688
WIRE 1376 -672 1376 -688
WIRE -1568 -656 -1568 -688
WIRE -448 -592 -448 -608
WIRE 448 -592 448 -768
WIRE 496 -592 448 -592
WIRE 592 -592 592 -640
WIRE 592 -592 576 -592
WIRE -624 -576 -624 -592
WIRE -624 -576 -1232 -576
WIRE 1232 -576 1232 -608
WIRE 1376 -576 1376 -592
WIRE -1264 -528 -1264 -688
WIRE -1264 -528 -1424 -528
WIRE -704 -528 -1200 -528
WIRE -448 -528 -704 -528
WIRE -224 -528 -448 -528
WIRE 512 -528 -224 -528
WIRE 1024 -528 608 -528
WIRE 1232 -528 1024 -528
WIRE 1376 -528 1232 -528
WIRE -1984 -512 -2032 -512
WIRE -1744 -512 -1904 -512
WIRE -1712 -512 -1744 -512
WIRE -704 -512 -704 -528
WIRE -448 -512 -448 -528
WIRE 1232 -512 1232 -528
WIRE 1376 -512 1376 -528
WIRE -1232 -464 -1232 -576
WIRE -1232 -464 -1424 -464
WIRE -448 -432 -448 -448
WIRE 448 -432 448 -592
WIRE 496 -432 448 -432
WIRE 592 -432 592 -480
WIRE 592 -432 576 -432
WIRE -1744 -416 -1744 -512
WIRE -1712 -416 -1744 -416
WIRE -704 -416 -704 -432
WIRE -704 -416 -1168 -416
WIRE 1232 -416 1232 -448
WIRE 1376 -416 1376 -432
WIRE -1376 -400 -1424 -400
WIRE -1264 -400 -1264 -528
WIRE -1264 -400 -1312 -400
WIRE -784 -368 -1104 -368
WIRE -448 -368 -784 -368
WIRE -128 -368 -448 -368
WIRE 512 -368 -128 -368
WIRE 1104 -368 608 -368
WIRE 1232 -368 1104 -368
WIRE 1376 -368 1232 -368
WIRE -784 -352 -784 -368
WIRE 1232 -352 1232 -368
WIRE 1376 -352 1376 -368
WIRE -448 -336 -448 -368
WIRE -1568 -320 -1568 -352
WIRE 448 -272 448 -432
WIRE 480 -272 448 -272
WIRE 592 -272 592 -320
WIRE 592 -272 560 -272
WIRE -784 -256 -784 -272
WIRE -784 -256 -1072 -256
WIRE -448 -256 -448 -272
WIRE 1232 -256 1232 -288
WIRE 1376 -256 1376 -272
WIRE -864 -208 -1008 -208
WIRE -448 -208 -864 -208
WIRE -16 -208 -448 -208
WIRE 512 -208 -16 -208
WIRE 1184 -208 608 -208
WIRE 1232 -208 1184 -208
WIRE 1376 -208 1232 -208
WIRE -1264 -192 -1424 -192
WIRE -1200 -192 -1200 -528
WIRE -1200 -192 -1264 -192
WIRE -864 -192 -864 -208
WIRE 1232 -192 1232 -208
WIRE 1376 -192 1376 -208
WIRE -1984 -176 -2032 -176
WIRE -1744 -176 -1904 -176
WIRE -1712 -176 -1744 -176
WIRE -448 -176 -448 -208
WIRE -352 -160 -352 -688
WIRE -224 -160 -224 -528
WIRE -1168 -128 -1168 -416
WIRE -1168 -128 -1424 -128
WIRE 448 -112 448 -272
WIRE 480 -112 448 -112
WIRE 592 -112 592 -160
WIRE 592 -112 560 -112
WIRE -864 -96 -864 -112
WIRE -864 -96 -976 -96
WIRE -448 -96 -448 -112
WIRE -128 -96 -128 -368
WIRE -16 -96 -16 -208
WIRE 1024 -96 1024 -528
WIRE 1024 -96 768 -96
WIRE 1232 -96 1232 -128
WIRE 1376 -96 1376 -112
WIRE -1744 -80 -1744 -176
WIRE -1712 -80 -1744 -80
WIRE -1376 -64 -1424 -64
WIRE -1264 -64 -1264 -192
WIRE -1264 -64 -1312 -64
WIRE 176 -64 176 -864
WIRE 304 -64 304 -864
WIRE 768 -32 768 -96
WIRE -1568 16 -1568 -16
WIRE -352 32 -352 -80
WIRE -352 32 -480 32
WIRE 96 32 -352 32
WIRE 448 32 448 -112
WIRE 448 32 384 32
WIRE 448 64 448 32
WIRE -352 112 -352 32
WIRE -224 112 -224 -80
WIRE 96 112 -224 112
WIRE -1264 128 -1424 128
WIRE -1104 128 -1104 -368
WIRE -1104 128 -1264 128
WIRE -1984 144 -2032 144
WIRE -1744 144 -1904 144
WIRE -1712 144 -1744 144
WIRE -224 144 -224 112
WIRE 448 144 448 128
WIRE -1072 192 -1072 -256
WIRE -1072 192 -1424 192
WIRE -128 192 -128 -16
WIRE 96 192 -128 192
WIRE -1744 240 -1744 144
WIRE -1712 240 -1744 240
WIRE -128 240 -128 192
WIRE -1376 256 -1424 256
WIRE -1264 256 -1264 128
WIRE -1264 256 -1312 256
WIRE -16 272 -16 -16
WIRE 96 272 -16 272
WIRE 688 272 384 272
WIRE 768 272 768 48
WIRE 768 272 688 272
WIRE -1568 336 -1568 304
WIRE -544 352 -544 -736
WIRE 96 352 -544 352
WIRE 864 352 864 -864
WIRE 864 352 384 352
WIRE -624 432 -624 -576
WIRE 96 432 -624 432
WIRE 944 432 944 -688
WIRE 944 432 384 432
WIRE -1264 448 -1424 448
WIRE -1008 448 -1008 -208
WIRE -1008 448 -1264 448
WIRE -1984 464 -2032 464
WIRE -1744 464 -1904 464
WIRE -1712 464 -1744 464
WIRE -976 512 -976 -96
WIRE -976 512 -1424 512
WIRE -704 512 -704 -416
WIRE 96 512 -704 512
WIRE 1024 512 1024 -96
WIRE 1024 512 384 512
WIRE -1744 560 -1744 464
WIRE -1712 560 -1744 560
WIRE -1376 576 -1424 576
WIRE -1264 576 -1264 448
WIRE -1264 576 -1312 576
WIRE -784 592 -784 -256
WIRE 96 592 -784 592
WIRE 1104 592 1104 -368
WIRE 1104 592 384 592
WIRE -1568 656 -1568 624
WIRE -864 672 -864 -96
WIRE 96 672 -864 672
WIRE 1184 672 1184 -208
WIRE 1184 672 384 672
WIRE -480 688 -480 32
WIRE -528 768 -1072 768
WIRE -1072 784 -1072 768
WIRE 176 784 176 768
WIRE 304 784 304 768
WIRE -480 800 -480 784
WIRE 304 864 304 848
WIRE -1072 880 -1072 864
FLAG 1600 -752 0
FLAG 2032 -832 0
FLAG 1664 -784 0
FLAG -2032 -512 0
FLAG -2032 -176 0
FLAG -2032 -848 0
FLAG 448 144 0
FLAG 304 864 0
FLAG 176 784 0
FLAG -448 -432 0
FLAG -1568 -656 0
FLAG -1568 -320 0
FLAG -448 -256 0
FLAG -448 -96 0
FLAG -1568 16 0
FLAG 688 272 _RESET
FLAG -480 800 0
FLAG -1072 880 0
FLAG 1232 -416 0
FLAG 1232 -256 0
FLAG 1232 -96 0
FLAG -448 -592 0
FLAG 1232 -576 0
FLAG -448 -768 0
FLAG 1232 -752 0
FLAG -96 272 0
FLAG -208 240 0
FLAG -304 144 0
FLAG -432 112 0
FLAG -2032 144 0
FLAG -1568 336 0
FLAG -2032 464 0
FLAG -1568 656 0
FLAG 1376 -416 0
FLAG 1376 -256 0
FLAG 1376 -96 0
FLAG 1376 -576 0
FLAG 1376 -752 0
SYMBOL voltage -1888 -848 R90
SYMATTR InstName V1
SYMATTR Value PULSE(0 5.5 10m 1m 1m 10 20)
SYMBOL voltage -1888 -512 R90
SYMATTR InstName V2
SYMATTR Value PULSE(0 3.8 20m 1m 1m 10 20)
SYMBOL voltage -1888 -176 R90
SYMATTR InstName V3
SYMATTR Value PULSE(0 3.5 27m 1m 1m 10 20)
SYMBOL nmos 512 -160 R270
SYMATTR InstName Q1
SYMATTR Value Si2316DS
SYMBOL nmos 512 -320 R270
SYMATTR InstName Q2
SYMATTR Value Si2316DS
SYMBOL nmos 512 -480 R270
SYMATTR InstName Q3
SYMATTR Value Si2316DS
SYMBOL cap 432 64 R0
SYMATTR InstName C1
SYMATTR Value .47
SYMBOL res 752 -48 R0
SYMATTR InstName R1
SYMATTR Value 4.7K
SYMBOL cap 288 784 R0
SYMATTR InstName C2
SYMATTR Value .22
SYMBOL res -240 -176 R0
SYMATTR InstName R2
SYMATTR Value 178K
SYMBOL res -368 -176 R0
SYMATTR InstName R3
SYMATTR Value 232K
SYMBOL res -720 -528 R0
SYMATTR InstName R4
SYMATTR Value 100
SYMBOL PowerProducts\\LT1763-5 -1568 -800 R0
SYMATTR InstName U1
SYMBOL cap -464 -512 R0
SYMATTR InstName C3
SYMATTR Value 10
SYMBOL cap -1312 -752 R90
SYMATTR InstName C4
SYMATTR Value .01
SYMBOL cap -1312 -416 R90
SYMATTR InstName C5
SYMATTR Value .01
SYMBOL cap -464 -336 R0
SYMATTR InstName C6
SYMATTR Value 10
SYMBOL PowerProducts\\LT1763-3.3 -1568 -464 R0
SYMATTR InstName U2
SYMBOL cap -464 -176 R0
SYMATTR InstName C7
SYMATTR Value 10
SYMBOL cap -1312 -80 R90
SYMATTR InstName C8
SYMATTR Value .01
SYMBOL PowerProducts\\LT1763-2.5 -1568 -128 R0
SYMATTR InstName U3
SYMBOL nmos -528 688 R0
SYMATTR InstName Q4
SYMATTR Value BSS123
SYMBOL voltage -1072 768 R0
SYMATTR InstName V4
SYMATTR Value PULSE(0 5 2.5 100n 100n 200u 100)
SYMBOL cap 1216 -512 R0
SYMATTR InstName C9
SYMATTR Value 10
SYMBOL cap 1216 -352 R0
SYMATTR InstName C10
SYMATTR Value 10
SYMBOL cap 1216 -192 R0
SYMATTR InstName C11
SYMATTR Value 10
SYMBOL voltage 1904 -832 R270
SYMATTR InstName V5
SYMATTR Value PULSE(0 1 2 100n 100n 100u 100)
SYMBOL sw 1600 -752 R180
SYMATTR InstName S1
SYMATTR Value SSHRT
SYMBOL LTC2922 240 352 R0
SYMATTR InstName U4
SYMBOL nmos 512 -640 R270
SYMATTR InstName Q5
SYMATTR Value Si2316DS
SYMBOL res -640 -688 R0
SYMATTR InstName R5
SYMATTR Value 100
SYMBOL cap -464 -672 R0
SYMATTR InstName C12
SYMATTR Value 10
SYMBOL cap 1216 -672 R0
SYMATTR InstName C13
SYMATTR Value 10
SYMBOL nmos 512 -816 R270
SYMATTR InstName Q6
SYMATTR Value Si2316DS
SYMBOL res 304 -880 R90
SYMATTR InstName R6
SYMATTR Value 50m
SYMBOL res -560 -864 R0
SYMATTR InstName R7
SYMATTR Value 100
SYMBOL cap -464 -848 R0
SYMATTR InstName C14
SYMATTR Value 10
SYMBOL cap 1216 -848 R0
SYMATTR InstName C15
SYMATTR Value 10
SYMBOL res -144 -112 R0
SYMATTR InstName R8
SYMATTR Value 113K
SYMBOL res -112 224 R90
SYMATTR InstName R9
SYMATTR Value 49.9K
SYMBOL res -32 -112 R0
SYMATTR InstName R10
SYMATTR Value 86.6K
SYMBOL res 0 256 R90
SYMATTR InstName R11
SYMATTR Value 49.9K
SYMBOL res -208 128 R90
SYMATTR InstName R12
SYMATTR Value 49.9K
SYMBOL res -336 96 R90
SYMATTR InstName R13
SYMATTR Value 49.9K
SYMBOL voltage -1888 144 R90
SYMATTR InstName V6
SYMATTR Value PULSE(0 2.5 27m 1m 1m 10 20)
SYMBOL cap -1312 240 R90
SYMATTR InstName C16
SYMATTR Value .01
SYMBOL res -800 -368 R0
SYMATTR InstName R14
SYMATTR Value 100
SYMBOL voltage -1888 464 R90
SYMATTR InstName V7
SYMATTR Value PULSE(0 2.5 27m 1m 1m 10 20)
SYMBOL cap -1312 560 R90
SYMATTR InstName C17
SYMATTR Value .01
SYMBOL res -880 -208 R0
SYMATTR InstName R15
SYMATTR Value 100
SYMBOL res 576 -784 R90
SYMATTR InstName R16
SYMATTR Value 10
SYMBOL res 592 -608 R90
SYMATTR InstName R17
SYMATTR Value 10
SYMBOL res 592 -448 R90
SYMATTR InstName R18
SYMATTR Value 10
SYMBOL res 576 -288 R90
SYMATTR InstName R19
SYMATTR Value 10
SYMBOL res 576 -128 R90
SYMATTR InstName R20
SYMATTR Value 10
SYMBOL PowerProducts\\LT1763-1.8 -1568 192 R0
SYMATTR InstName U5
SYMBOL PowerProducts\\LT1763-1.5 -1568 512 R0
SYMATTR InstName U6
SYMBOL res 1360 -208 R0
SYMATTR InstName Rload4
SYMATTR Value 70
SYMBOL res 1360 -368 R0
SYMATTR InstName Rload3
SYMATTR Value 70
SYMBOL res 1360 -528 R0
SYMATTR InstName Rload2
SYMATTR Value 70
SYMBOL res 1360 -688 R0
SYMATTR InstName Rload1
SYMATTR Value 70
SYMBOL res 1360 -864 R0
SYMATTR InstName Rload0
SYMATTR Value 70