* 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 N036 4.7K
C2 N039 0 .22
R2 N014 N031 178K
R3 N010 N030 178K
R4 N014 N018 100
C3 N014 0 10
C4 N001 N009 .01
C5 N010 N019 .01
C6 N020 0 10
C7 N024 0 10
C8 N014 N029 .01
XU1 N014 N018 0 N029 N026 MP_01 MP_02 N026 LT1763-2.5 ;pnba OUT)Sense)GND)BYP)_SHDN)))IN
MQ4 N030 N040 0 0 BSS123
V4 N040 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 N037 0 PULSE(0 2.5 27m 1m 1m 10 20)
C17 N024 N038 .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
XU2 N020 N023 0 N034 N032 MP_03 MP_04 N032 LT1763-1.8 ;pnba OUT)Sense)GND)BYP)_SHDN)))IN
XU3 N024 N028 0 N038 N037 MP_05 MP_06 N037 LT1763-1.5 ;pnba OUT)Sense)GND)BYP)_SHDN)))IN
XU4 N030 N031 N033 N035 N023 N021 N018 N015 N013 N011 0 N036 N007 N002 N001 N039 N006 N003 N028 N025 LTC2922-2.5 ;pnba V1)V2)V3)V4)S3)D3)S2)D2)S1)D1)Gnd)PG)Gate)Sense)Vcc)Timer)S0)D0)S4)D4
XU5 N010 N013 0 N019 N016 MP_07 MP_08 N016 LT1763-2.5 ;pnba OUT)Sense)GND)BYP)_SHDN)))IN
XU6 N001 N006 0 N009 N004 MP_09 MP_10 N004 LT1763-2.5 ;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 3872 1792
WIRE -1168 -880 -1328 -880
WIRE -448 -880 -1168 -880
WIRE -320 -880 -448 -880
WIRE 272 -880 -320 -880
WIRE 304 -880 272 -880
WIRE 400 -880 384 -880
WIRE 608 -880 400 -880
WIRE 864 -880 704 -880
WIRE 1264 -880 864 -880
WIRE 1376 -880 1264 -880
WIRE 1520 -880 1376 -880
WIRE -1888 -864 -1936 -864
WIRE -1648 -864 -1808 -864
WIRE -1616 -864 -1648 -864
WIRE -448 -864 -448 -880
WIRE -320 -864 -320 -880
WIRE 1264 -864 1264 -880
WIRE 1376 -864 1376 -880
WIRE 1520 -864 1520 -880
WIRE 1808 -848 1568 -848
WIRE 1936 -848 1888 -848
WIRE -560 -816 -1328 -816
WIRE 1584 -800 1568 -800
WIRE -320 -784 -320 -800
WIRE 576 -784 544 -784
WIRE 688 -784 688 -832
WIRE 688 -784 656 -784
WIRE -1648 -768 -1648 -864
WIRE -1616 -768 -1648 -768
WIRE 1264 -768 1264 -800
WIRE 1376 -768 1376 -784
WIRE 1520 -768 1520 -784
WIRE -1280 -752 -1328 -752
WIRE -1168 -752 -1168 -880
WIRE -1168 -752 -1216 -752
WIRE -560 -752 -560 -816
WIRE -448 -752 -448 -784
WIRE -448 -752 -560 -752
WIRE -528 -704 -1168 -704
WIRE -352 -704 -528 -704
WIRE -256 -704 -352 -704
WIRE 608 -704 -256 -704
WIRE 944 -704 704 -704
WIRE 1264 -704 944 -704
WIRE 1376 -704 1264 -704
WIRE -528 -688 -528 -704
WIRE -352 -688 -352 -704
WIRE 1264 -688 1264 -704
WIRE 1376 -688 1376 -704
WIRE -1472 -672 -1472 -704
WIRE -352 -608 -352 -624
WIRE 544 -608 544 -784
WIRE 592 -608 544 -608
WIRE 688 -608 688 -656
WIRE 688 -608 672 -608
WIRE -528 -592 -528 -608
WIRE -528 -592 -1136 -592
WIRE 1264 -592 1264 -624
WIRE 1376 -592 1376 -608
WIRE -1168 -544 -1168 -704
WIRE -1168 -544 -1328 -544
WIRE -608 -544 -1104 -544
WIRE -352 -544 -608 -544
WIRE -128 -544 -352 -544
WIRE 608 -544 -128 -544
WIRE 1024 -544 704 -544
WIRE 1264 -544 1024 -544
WIRE 1376 -544 1264 -544
WIRE -1888 -528 -1936 -528
WIRE -1648 -528 -1808 -528
WIRE -1616 -528 -1648 -528
WIRE -608 -528 -608 -544
WIRE -352 -528 -352 -544
WIRE 1264 -528 1264 -544
WIRE 1376 -528 1376 -544
WIRE -1136 -480 -1136 -592
WIRE -1136 -480 -1328 -480
WIRE -352 -448 -352 -464
WIRE 544 -448 544 -608
WIRE 592 -448 544 -448
WIRE 688 -448 688 -496
WIRE 688 -448 672 -448
WIRE -1648 -432 -1648 -528
WIRE -1616 -432 -1648 -432
WIRE -608 -432 -608 -448
WIRE -608 -432 -1072 -432
WIRE 1264 -432 1264 -464
WIRE 1376 -432 1376 -448
WIRE -1280 -416 -1328 -416
WIRE -1168 -416 -1168 -544
WIRE -1168 -416 -1216 -416
WIRE -688 -384 -1008 -384
WIRE -352 -384 -688 -384
WIRE -32 -384 -352 -384
WIRE 608 -384 -32 -384
WIRE 1104 -384 704 -384
WIRE 1264 -384 1104 -384
WIRE 1376 -384 1264 -384
WIRE -688 -368 -688 -384
WIRE 1264 -368 1264 -384
WIRE 1376 -368 1376 -384
WIRE -352 -352 -352 -384
WIRE -1472 -336 -1472 -368
WIRE 544 -288 544 -448
WIRE 576 -288 544 -288
WIRE 688 -288 688 -336
WIRE 688 -288 656 -288
WIRE -688 -272 -688 -288
WIRE -688 -272 -976 -272
WIRE -352 -272 -352 -288
WIRE 1264 -272 1264 -304
WIRE 1376 -272 1376 -288
WIRE -768 -224 -912 -224
WIRE -352 -224 -768 -224
WIRE 80 -224 -352 -224
WIRE 608 -224 80 -224
WIRE 1184 -224 704 -224
WIRE 1264 -224 1184 -224
WIRE 1376 -224 1264 -224
WIRE -1168 -208 -1328 -208
WIRE -1104 -208 -1104 -544
WIRE -1104 -208 -1168 -208
WIRE -768 -208 -768 -224
WIRE 1264 -208 1264 -224
WIRE 1376 -208 1376 -224
WIRE -1888 -192 -1936 -192
WIRE -1648 -192 -1808 -192
WIRE -1616 -192 -1648 -192
WIRE -352 -192 -352 -224
WIRE -256 -176 -256 -704
WIRE -128 -176 -128 -544
WIRE -1072 -144 -1072 -432
WIRE -1072 -144 -1328 -144
WIRE 544 -128 544 -288
WIRE 576 -128 544 -128
WIRE 688 -128 688 -176
WIRE 688 -128 656 -128
WIRE -768 -112 -768 -128
WIRE -768 -112 -880 -112
WIRE -352 -112 -352 -128
WIRE -32 -112 -32 -384
WIRE 80 -112 80 -224
WIRE 1024 -112 1024 -544
WIRE 1024 -112 768 -112
WIRE 1264 -112 1264 -144
WIRE 1376 -112 1376 -128
WIRE -1648 -96 -1648 -192
WIRE -1616 -96 -1648 -96
WIRE -1280 -80 -1328 -80
WIRE -1168 -80 -1168 -208
WIRE -1168 -80 -1216 -80
WIRE 272 -80 272 -880
WIRE 400 -80 400 -880
WIRE 768 -48 768 -112
WIRE -1472 0 -1472 -32
WIRE -256 16 -256 -96
WIRE -256 16 -384 16
WIRE 192 16 -256 16
WIRE 544 16 544 -128
WIRE 544 16 480 16
WIRE 544 48 544 16
WIRE -256 96 -256 16
WIRE -128 96 -128 -96
WIRE 192 96 -128 96
WIRE -1168 112 -1328 112
WIRE -1008 112 -1008 -384
WIRE -1008 112 -1168 112
WIRE -1888 128 -1936 128
WIRE -1648 128 -1808 128
WIRE -1616 128 -1648 128
WIRE -128 128 -128 96
WIRE 544 128 544 112
WIRE -976 176 -976 -272
WIRE -976 176 -1328 176
WIRE -32 176 -32 -32
WIRE 192 176 -32 176
WIRE -1648 224 -1648 128
WIRE -1616 224 -1648 224
WIRE -32 224 -32 176
WIRE -1280 240 -1328 240
WIRE -1168 240 -1168 112
WIRE -1168 240 -1216 240
WIRE 80 256 80 -32
WIRE 192 256 80 256
WIRE 768 256 768 32
WIRE 768 256 480 256
WIRE -1472 320 -1472 288
WIRE -448 336 -448 -752
WIRE 192 336 -448 336
WIRE 864 336 864 -880
WIRE 864 336 480 336
WIRE -528 416 -528 -592
WIRE 192 416 -528 416
WIRE 944 416 944 -704
WIRE 944 416 480 416
WIRE -1168 432 -1328 432
WIRE -912 432 -912 -224
WIRE -912 432 -1168 432
WIRE -1888 448 -1936 448
WIRE -1648 448 -1808 448
WIRE -1616 448 -1648 448
WIRE -880 496 -880 -112
WIRE -880 496 -1328 496
WIRE -608 496 -608 -432
WIRE 192 496 -608 496
WIRE 1024 496 1024 -112
WIRE 1024 496 480 496
WIRE -1648 544 -1648 448
WIRE -1616 544 -1648 544
WIRE -1280 560 -1328 560
WIRE -1168 560 -1168 432
WIRE -1168 560 -1216 560
WIRE -688 576 -688 -272
WIRE 192 576 -688 576
WIRE 1104 576 1104 -384
WIRE 1104 576 480 576
WIRE -1472 640 -1472 608
WIRE -768 656 -768 -112
WIRE 192 656 -768 656
WIRE 1184 656 1184 -224
WIRE 1184 656 480 656
WIRE -384 704 -384 16
WIRE 272 768 272 752
WIRE 400 768 400 752
WIRE -432 784 -896 784
WIRE -896 800 -896 784
WIRE -384 816 -384 800
WIRE 400 848 400 832
WIRE -896 896 -896 880
FLAG 1520 -768 0
FLAG 1936 -848 0
FLAG 1584 -800 0
FLAG -1936 -528 0
FLAG -1936 -192 0
FLAG -1936 -864 0
FLAG 544 128 0
FLAG 400 848 0
FLAG 272 768 0
FLAG -352 -448 0
FLAG -1472 -672 0
FLAG -1472 -336 0
FLAG -352 -272 0
FLAG -352 -112 0
FLAG -1472 0 0
FLAG -384 816 0
FLAG -896 896 0
FLAG 1264 -432 0
FLAG 1264 -272 0
FLAG 1264 -112 0
FLAG -352 -608 0
FLAG 1264 -592 0
FLAG -320 -784 0
FLAG 1264 -768 0
FLAG 0 256 0
FLAG -112 224 0
FLAG -208 128 0
FLAG -336 96 0
FLAG -1936 128 0
FLAG -1472 320 0
FLAG -1936 448 0
FLAG -1472 640 0
FLAG 1376 -432 0
FLAG 1376 -272 0
FLAG 1376 -112 0
FLAG 1376 -592 0
FLAG 1376 -768 0
SYMBOL voltage -1792 -864 R90
SYMATTR InstName V1
SYMATTR Value PULSE(0 5.5 10m 1m 1m 10 20)
SYMBOL voltage -1792 -528 R90
SYMATTR InstName V2
SYMATTR Value PULSE(0 3.8 20m 1m 1m 10 20)
SYMBOL voltage -1792 -192 R90
SYMATTR InstName V3
SYMATTR Value PULSE(0 3.5 27m 1m 1m 10 20)
SYMBOL nmos 608 -176 R270
SYMATTR InstName Q1
SYMATTR Value Si2316DS
SYMBOL nmos 608 -336 R270
SYMATTR InstName Q2
SYMATTR Value Si2316DS
SYMBOL nmos 608 -496 R270
SYMATTR InstName Q3
SYMATTR Value Si2316DS
SYMBOL cap 528 48 R0
SYMATTR InstName C1
SYMATTR Value .47
SYMBOL res 752 -64 R0
SYMATTR InstName R1
SYMATTR Value 4.7K
SYMBOL cap 384 768 R0
SYMATTR InstName C2
SYMATTR Value .22
SYMBOL res -144 -192 R0
SYMATTR InstName R2
SYMATTR Value 178K
SYMBOL res -272 -192 R0
SYMATTR InstName R3
SYMATTR Value 178K
SYMBOL res -624 -544 R0
SYMATTR InstName R4
SYMATTR Value 100
SYMBOL cap -368 -528 R0
SYMATTR InstName C3
SYMATTR Value 10
SYMBOL cap -1216 -768 R90
SYMATTR InstName C4
SYMATTR Value .01
SYMBOL cap -1216 -432 R90
SYMATTR InstName C5
SYMATTR Value .01
SYMBOL cap -368 -352 R0
SYMATTR InstName C6
SYMATTR Value 10
SYMBOL cap -368 -192 R0
SYMATTR InstName C7
SYMATTR Value 10
SYMBOL cap -1216 -96 R90
SYMATTR InstName C8
SYMATTR Value .01
SYMBOL PowerProducts\\LT1763-2.5 -1472 -144 R0
SYMATTR InstName U1
SYMBOL nmos -432 704 R0
SYMATTR InstName Q4
SYMATTR Value BSS123
SYMBOL voltage -896 784 R0
SYMATTR InstName V4
SYMATTR Value PULSE(0 5 2.5 100n 100n 200u 100)
SYMBOL cap 1248 -528 R0
SYMATTR InstName C9
SYMATTR Value 10
SYMBOL cap 1248 -368 R0
SYMATTR InstName C10
SYMATTR Value 10
SYMBOL cap 1248 -208 R0
SYMATTR InstName C11
SYMATTR Value 10
SYMBOL voltage 1792 -848 R270
SYMATTR InstName V5
SYMATTR Value PULSE(0 1 2 100n 100n 100u 100)
SYMBOL sw 1520 -768 R180
SYMATTR InstName S1
SYMATTR Value SSHRT
SYMBOL nmos 608 -656 R270
SYMATTR InstName Q5
SYMATTR Value Si2316DS
SYMBOL res -544 -704 R0
SYMATTR InstName R5
SYMATTR Value 100
SYMBOL cap -368 -688 R0
SYMATTR InstName C12
SYMATTR Value 10
SYMBOL cap 1248 -688 R0
SYMATTR InstName C13
SYMATTR Value 10
SYMBOL nmos 608 -832 R270
SYMATTR InstName Q6
SYMATTR Value Si2316DS
SYMBOL res 400 -896 R90
SYMATTR InstName R6
SYMATTR Value 50m
SYMBOL res -464 -880 R0
SYMATTR InstName R7
SYMATTR Value 100
SYMBOL cap -336 -864 R0
SYMATTR InstName C14
SYMATTR Value 10
SYMBOL cap 1248 -864 R0
SYMATTR InstName C15
SYMATTR Value 10
SYMBOL res -48 -128 R0
SYMATTR InstName R8
SYMATTR Value 113K
SYMBOL res -16 208 R90
SYMATTR InstName R9
SYMATTR Value 49.9K
SYMBOL res 64 -128 R0
SYMATTR InstName R10
SYMATTR Value 86.6K
SYMBOL res 96 240 R90
SYMATTR InstName R11
SYMATTR Value 49.9K
SYMBOL res -112 112 R90
SYMATTR InstName R12
SYMATTR Value 49.9K
SYMBOL res -240 80 R90
SYMATTR InstName R13
SYMATTR Value 49.9K
SYMBOL voltage -1792 128 R90
SYMATTR InstName V6
SYMATTR Value PULSE(0 2.5 27m 1m 1m 10 20)
SYMBOL cap -1216 224 R90
SYMATTR InstName C16
SYMATTR Value .01
SYMBOL res -704 -384 R0
SYMATTR InstName R14
SYMATTR Value 100
SYMBOL voltage -1792 448 R90
SYMATTR InstName V7
SYMATTR Value PULSE(0 2.5 27m 1m 1m 10 20)
SYMBOL cap -1216 544 R90
SYMATTR InstName C17
SYMATTR Value .01
SYMBOL res -784 -224 R0
SYMATTR InstName R15
SYMATTR Value 100
SYMBOL res 672 -800 R90
SYMATTR InstName R16
SYMATTR Value 10
SYMBOL res 688 -624 R90
SYMATTR InstName R17
SYMATTR Value 10
SYMBOL res 688 -464 R90
SYMATTR InstName R18
SYMATTR Value 10
SYMBOL res 672 -304 R90
SYMATTR InstName R19
SYMATTR Value 10
SYMBOL res 672 -144 R90
SYMATTR InstName R20
SYMATTR Value 10
SYMBOL PowerProducts\\LT1763-1.8 -1472 176 R0
SYMATTR InstName U2
SYMBOL PowerProducts\\LT1763-1.5 -1472 496 R0
SYMATTR InstName U3
SYMBOL LTC2922-2.5 336 336 R0
SYMATTR InstName U4
SYMBOL PowerProducts\\LT1763-2.5 -1472 -480 R0
SYMATTR InstName U5
SYMBOL PowerProducts\\LT1763-2.5 -1472 -816 R0
SYMATTR InstName U6
SYMBOL res 1360 -224 R0
SYMATTR InstName Rload4
SYMATTR Value 70
SYMBOL res 1360 -384 R0
SYMATTR InstName Rload3
SYMATTR Value 70
SYMBOL res 1360 -544 R0
SYMATTR InstName Rload2
SYMATTR Value 70
SYMBOL res 1360 -704 R0
SYMATTR InstName Rload1
SYMATTR Value 70
SYMBOL res 1360 -880 R0
SYMATTR InstName Rload0
SYMATTR Value 70