* SPICE netlist
R1 N028 0 20k
C1 N021 0 .001
V1 IN 0 24 Rser=1m
C2 N009 0 1
L1 N016 BUCK_OUT 2.2 Rser=3m
C3 N011 N016 .1
C4 BUCK_OUT 0 33 x3 V=6.3 Irms=0 Rser=0.002 Lser=0
XU1 N011 N016 N009 N028 N010 N022 N021 NC_01 IN IN 0 LT8609 ;pnba BST)SW)INTVCC)RT)SYNC)FB)TR/SS)PG)VIN)EN/UV)GND
XU2 N005 VSET IMON N004 N003 N002 LT3081 ;pnba Ilim)SET)Imon)OUT)Temp)IN
R4 N003 0 1k
R7 N004 N005 10k
R9 LDO_OUT N004 10m
R10 LDO_OUT N006 10m
R11 0 N006 10k
R13 N022 0 4k
Q1 N022 N023 N029 0 2N3906
R14 BUCK_OUT N029 1k
R15 N023 BUCK_OUT 100k
R16 LDO_OUT N023 100k
C5 BUCK_OUT N022 1nF
XU3 N019 VSET IMON N014 N013 N008 LT3081 ;pnba Ilim)SET)Imon)OUT)Temp)IN
R2 N013 0 1k
R18 N014 N019 10k
R20 LDO_OUT N014 10m
XU4 N036 IMON IN 0 N034 ADA4091 ;pnba In+)In-)V+)V-)OUT
VCC_DAC N036 0 3
R6 IMON 0 5K
XU5 N033 N030 IN 0 N031 ADA4091 ;pnba In+)In-)V+)V-)OUT
VCV_DAC N033 0 2
R3 N030 N031 9k
R5 N030 0 1k
C6 N030 N031 100p
C8 IMON VSET 1n
D1 VSET N035 1N5819
D2 VSET N032 1N5819
R17 N007 BUCK_OUT 1m
R22 N032 N031 1
R23 N035 N034 100
S1 0 LDO_OUT N012 0 SW
V2 N012 0 PWL(0 0 1.29m 0 1.3m 5)
R12 N008 N001 1m
R21 N002 N001 1m
Q2 N020 N015 N007 0 2SA2071P5
R24 N024 LDO_OUT 5k
D3 N024 N015 STZ6_8N
M1 N001 N026 N007 N007 FDS4685
R26 N026 0 1k
D4 N018 N001 1N5819
R25 N007 N015 10k
R28 N020 0 5k
Q3 N017 N020 N025 0 2SCR562F3
R30 N018 N027 2
R31 N027 N026 1m
R32 N026 N025 1m
R27 N007 N017 10m
.tran 10m startup

* LTspice schematic (.asc)
Version 4.1
SHEET 1 4064 2288
WIRE 640 -1128 432 -1128
WIRE 896 -1128 720 -1128
WIRE 896 -1064 896 -1128
WIRE 768 -1000 608 -1000
WIRE 1088 -1000 1024 -1000
WIRE 1216 -1000 1088 -1000
WIRE 1456 -1000 1296 -1000
WIRE 1088 -984 1088 -1000
WIRE 720 -904 704 -904
WIRE 768 -904 720 -904
WIRE 1088 -904 1024 -904
WIRE 608 -888 608 -1000
WIRE 1328 -840 1280 -840
WIRE 1456 -840 1456 -1000
WIRE 1456 -840 1408 -840
WIRE 1280 -824 1280 -840
WIRE 896 -808 896 -840
WIRE 928 -808 896 -808
WIRE 608 -776 608 -808
WIRE -1936 -728 -2032 -728
WIRE -1776 -728 -1936 -728
WIRE 1280 -728 1280 -744
WIRE -2032 -712 -2032 -728
WIRE -1776 -712 -1776 -728
WIRE -1312 -712 -1392 -712
WIRE -1232 -712 -1312 -712
WIRE -1120 -712 -1232 -712
WIRE -608 -712 -1040 -712
WIRE -416 -712 -608 -712
WIRE -240 -712 -416 -712
WIRE -64 -712 -240 -712
WIRE 224 -712 32 -712
WIRE 432 -712 432 -1128
WIRE 432 -712 224 -712
WIRE 688 -712 432 -712
WIRE 896 -712 768 -712
WIRE -1232 -696 -1232 -712
WIRE -1936 -664 -1936 -728
WIRE -1920 -664 -1936 -664
WIRE -1616 -664 -1632 -664
WIRE -1536 -664 -1552 -664
WIRE -608 -648 -608 -712
WIRE 1456 -648 1456 -840
WIRE 1808 -648 1456 -648
WIRE 1888 -648 1808 -648
WIRE -2032 -616 -2032 -632
WIRE -1232 -600 -1232 -632
WIRE -240 -600 -240 -712
WIRE 224 -600 224 -712
WIRE 896 -600 896 -712
WIRE 1888 -584 1888 -648
WIRE -1920 -568 -1936 -568
WIRE -1600 -568 -1632 -568
WIRE -416 -568 -416 -712
WIRE 2032 -568 1936 -568
WIRE -1600 -552 -1600 -568
WIRE 768 -536 608 -536
WIRE 1088 -536 1024 -536
WIRE 1216 -536 1088 -536
WIRE 1456 -536 1456 -648
WIRE 1456 -536 1296 -536
WIRE 2032 -536 2032 -568
WIRE -608 -520 -608 -568
WIRE -480 -520 -608 -520
WIRE 1088 -520 1088 -536
WIRE -608 -488 -608 -520
WIRE -1600 -472 -1600 -488
WIRE -1600 -472 -1632 -472
WIRE -1552 -472 -1600 -472
WIRE -1392 -472 -1392 -712
WIRE -1392 -472 -1472 -472
WIRE -240 -456 -240 -520
WIRE 224 -456 224 -536
WIRE 720 -440 704 -440
WIRE 768 -440 720 -440
WIRE 1088 -440 1024 -440
WIRE 1888 -440 1888 -504
WIRE 1936 -440 1936 -520
WIRE 1936 -440 1888 -440
WIRE 2032 -440 2032 -456
WIRE 2032 -440 1936 -440
WIRE 608 -424 608 -536
WIRE 1888 -424 1888 -440
WIRE -416 -408 -416 -472
WIRE -304 -408 -416 -408
WIRE -2000 -376 -2032 -376
WIRE -1920 -376 -1936 -376
WIRE -1552 -376 -1632 -376
WIRE -1504 -376 -1552 -376
WIRE -1392 -376 -1392 -472
WIRE -1392 -376 -1440 -376
WIRE -1344 -376 -1392 -376
WIRE -1232 -376 -1264 -376
WIRE -1200 -376 -1232 -376
WIRE -1024 -376 -1120 -376
WIRE -768 -376 -1024 -376
WIRE -608 -376 -608 -424
WIRE -608 -376 -688 -376
WIRE -416 -360 -416 -408
WIRE 896 -344 896 -376
WIRE 928 -344 896 -344
WIRE -240 -328 -240 -360
WIRE -176 -328 -240 -328
WIRE -48 -328 -48 -664
WIRE -48 -328 -96 -328
WIRE 64 -328 -48 -328
WIRE 224 -328 224 -376
WIRE 224 -328 144 -328
WIRE 608 -312 608 -344
WIRE -1392 -296 -1392 -376
WIRE -48 -296 -48 -328
WIRE -2016 -280 -2032 -280
WIRE -1920 -280 -1936 -280
WIRE -1616 -280 -1632 -280
WIRE -416 -264 -416 -280
WIRE -1392 -184 -1392 -216
WIRE -48 -184 -48 -216
WIRE -1232 -136 -1232 -376
WIRE -1232 -136 -1328 -136
WIRE -1552 -72 -1552 -376
WIRE -1392 -72 -1392 -88
WIRE -1392 -72 -1552 -72
WIRE -1024 -72 -1024 -376
WIRE -944 -72 -1024 -72
WIRE -896 -72 -944 -72
WIRE -1392 -56 -1392 -72
WIRE -1392 72 -1392 24
WIRE -1200 360 -1296 360
WIRE -1040 360 -1120 360
WIRE -832 360 -1040 360
WIRE -736 360 -832 360
WIRE -832 408 -832 360
WIRE -736 424 -736 360
WIRE -1040 504 -1040 360
WIRE -976 504 -1040 504
WIRE -832 520 -832 488
WIRE -832 520 -912 520
WIRE -736 520 -736 488
WIRE -736 520 -832 520
WIRE -608 520 -736 520
WIRE -432 520 -528 520
WIRE -288 520 -368 520
WIRE -976 536 -1232 536
WIRE -1232 584 -1232 536
WIRE -1232 680 -1232 664
WIRE -288 696 -288 520
WIRE -192 696 -288 696
WIRE -144 696 -192 696
WIRE -912 872 -1008 872
WIRE -288 872 -288 696
WIRE -288 872 -848 872
WIRE -1184 968 -1232 968
WIRE -1008 968 -1008 872
WIRE -1008 968 -1184 968
WIRE -960 968 -1008 968
WIRE -784 984 -896 984
WIRE -432 984 -704 984
WIRE -288 984 -288 872
WIRE -288 984 -368 984
WIRE -960 1000 -1088 1000
WIRE -1232 1032 -1232 968
WIRE -1088 1048 -1088 1000
WIRE -1232 1144 -1232 1112
WIRE -1088 1144 -1088 1128
FLAG -2032 -280 0
FLAG -2032 -376 0
FLAG -2032 -616 0
FLAG -1536 -664 0
FLAG -1232 -600 0
FLAG -2032 -728 IN
FLAG -1616 -280 0
FLAG 608 -776 0
FLAG 1280 -728 0
FLAG -1392 72 0
FLAG 608 -312 0
FLAG 1888 -424 0
FLAG -1312 -712 BUCK_OUT
FLAG 928 -808 VSET
FLAG -928 1016 0
FLAG -928 952 IN
FLAG -1088 1144 0
FLAG -1232 1144 0
FLAG 720 -904 IMON
FLAG 720 -440 IMON
FLAG -1184 968 IMON
FLAG -944 552 0
FLAG -944 488 IN
FLAG -1232 680 0
FLAG -1296 360 0
FLAG -192 696 VSET
FLAG -944 -72 LDO_OUT
FLAG -48 -184 0
FLAG -416 -264 0
FLAG 1808 -648 LDO_OUT
FLAG 928 -344 VSET
SYMBOL res -1920 -296 R90
SYMATTR InstName R1
SYMATTR Value 20k
SYMBOL cap -1936 -392 R90
SYMATTR InstName C1
SYMATTR Value .001ľ
SYMBOL voltage -2032 -728 R0
SYMATTR SpiceLine Rser=1m
SYMATTR InstName V1
SYMATTR Value 24
SYMBOL cap -1616 -648 R270
SYMATTR InstName C2
SYMATTR Value 1ľ
SYMBOL ind -1568 -456 R270
SYMATTR InstName L1
SYMATTR Value 2.2ľ
SYMATTR SpiceLine Rser=3m
SYMBOL cap -1616 -552 R0
SYMATTR InstName C3
SYMATTR Value .1ľ
SYMBOL cap -1248 -696 R0
SYMATTR Value2 x3
SYMATTR InstName C4
SYMATTR Value 33ľ
SYMATTR SpiceLine V=6.3 Irms=0 Rser=0.002 Lser=0
SYMBOL PowerProducts\\LT8609 -1776 -472 R0
SYMATTR InstName U1
SYMBOL PowerProducts\\LT3081 896 -952 R0
SYMATTR InstName U2
SYMBOL res 592 -904 R0
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL res 1072 -1000 R0
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL res 1312 -1016 R90
SYMATTR InstName R9
SYMATTR Value 10m
SYMBOL res 1424 -856 R90
SYMATTR InstName R10
SYMATTR Value 10m
SYMBOL res 1296 -728 R180
SYMATTR InstName R11
SYMATTR Value 10k
SYMBOL res -1408 -72 R0
SYMATTR InstName R13
SYMATTR Value 4k
SYMBOL pnp -1328 -88 R180
SYMATTR InstName Q1
SYMATTR Value 2N3906
SYMBOL res -1408 -312 R0
SYMATTR InstName R14
SYMATTR Value 1k
SYMBOL res -1248 -392 R90
SYMATTR InstName R15
SYMATTR Value 100k
SYMBOL res -1104 -392 R90
SYMATTR InstName R16
SYMATTR Value 100k
SYMBOL cap -1440 -392 R90
SYMATTR InstName C5
SYMATTR Value 1nF
SYMBOL PowerProducts\\LT3081 896 -488 R0
SYMATTR InstName U3
SYMBOL res 592 -440 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL res 1072 -536 R0
SYMATTR InstName R18
SYMATTR Value 10k
SYMBOL res 1312 -552 R90
SYMATTR InstName R20
SYMATTR Value 10m
SYMBOL OpAmps\\ADA4091 -928 920 R0
SYMATTR InstName U4
SYMBOL voltage -1088 1032 R0
SYMATTR InstName CC_DAC
SYMATTR Value 3
SYMBOL res -1248 1016 R0
SYMATTR InstName R6
SYMATTR Value 5K
SYMBOL OpAmps\\ADA4091 -944 456 R0
SYMATTR InstName U5
SYMBOL voltage -1232 568 M0
SYMATTR InstName CV_DAC
SYMATTR Value 2
SYMBOL res -848 392 R0
SYMATTR InstName R3
SYMATTR Value 9k
SYMBOL res -1104 344 R90
SYMATTR InstName R5
SYMATTR Value 1k
SYMBOL cap -752 424 R0
SYMATTR InstName C6
SYMATTR Value 100p
SYMBOL cap -912 888 R270
SYMATTR InstName C8
SYMATTR Value 1n
SYMBOL diode -368 968 R90
SYMATTR InstName D1
SYMATTR Value 1N5819
SYMBOL diode -368 504 R90
SYMATTR InstName D2
SYMATTR Value 1N5819
SYMBOL res -1024 -728 R90
SYMATTR InstName R17
SYMATTR Value 1m
SYMBOL res -512 504 R90
SYMATTR InstName R22
SYMATTR Value 1
SYMBOL res -688 968 R90
SYMATTR InstName R23
SYMATTR Value 100
SYMBOL sw 1888 -488 R180
SYMATTR InstName S1
SYMBOL voltage 2032 -552 R0
SYMATTR InstName V2
SYMATTR Value PWL(0 0 1.29m 0 1.3m 5)
SYMBOL res 784 -728 R90
SYMATTR InstName R12
SYMATTR Value 1m
SYMBOL res 736 -1144 R90
SYMATTR InstName R21
SYMATTR Value 1m
SYMBOL pnp -480 -472 M180
SYMATTR InstName Q2
SYMATTR Value 2SA2071P5
SYMBOL res -672 -392 R90
SYMATTR InstName R24
SYMATTR Value 5k
SYMBOL diode -624 -424 M180
SYMATTR InstName D3
SYMATTR Value STZ6_8N
SYMBOL pmos 32 -664 M270
SYMATTR InstName M1
SYMATTR Value FDS4685
SYMBOL res -64 -312 R0
SYMATTR InstName R26
SYMATTR Value 1k
SYMBOL diode 240 -536 R180
SYMATTR InstName D4
SYMATTR Value 1N5819
SYMBOL res -624 -664 R0
SYMATTR InstName R25
SYMATTR Value 10k
SYMBOL res -432 -376 R0
SYMATTR InstName R28
SYMATTR Value 5k
SYMBOL npn -304 -456 R0
SYMATTR InstName Q3
SYMATTR Value 2SCR562F3
SYMBOL res 208 -472 R0
SYMATTR InstName R30
SYMATTR Value 2
SYMBOL res 160 -344 R90
SYMATTR InstName R31
SYMATTR Value 1m
SYMBOL res -80 -344 R90
SYMATTR InstName R32
SYMATTR Value 1m
SYMBOL res -256 -616 R0
SYMATTR InstName R27
SYMATTR Value 10m