* SPICE netlist
R1 N018 0 10K
S1 N002 IN N003 0 SW
S2 N015 N002 N008 0 SW
S3 N001 IN N004 0 SW
S4 N015 N001 N009 0 SW
R2 IN N005 100
R3 N015 0 100m
L1 N001 N002 1m
V1 IN 0 48
R4 IN N013 310K
R5 N013 0 10K
R6 N021 N020 5K
C1 N022 0 1n
C2 N023 0 152p
R7 N001 N011 28K
R8 N011 0 1K
R9 N002 N007 28K
R10 N007 0 1K
L2 N006 N012 0.2m
L3 N006 OUT 2.4
S5 0 N012 0 N017 SR
L4 N012 OUT 2.4
C3 OUT 0 100 Rser=50m
R11 OUT N019 3.15K
R12 N019 0 1K
S6 0 N006 0 N010 SR
C4 N005 0 100
R13 N015 N014 510
C5 0 N014 100p
C6 N020 N019 1n
D1 0 N012 DD
D2 0 N006 DD
C7 N001 0 2n
C8 N002 0 2n
Rload OUT 0 5
XU1 NC_01 N014 N014 N021 N018 N019 N022 N007 N013 N011 N016 N017 N010 N009 N005 N004 N008 N003 0 N023 LTC1922-1 ;pnba SYNC)Ramp)CS)COMP)RLEB)FB)SS)PDLY)SBUS)ADLY)VREF)_OUTF)_OUTE)OUTD)VCC)OUTC)OUTB)OUTA)GND)CT
K1 L1 L2 0.998
.tran 4m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 2784 1024
WIRE -1360 -512 -1392 -512
WIRE -1264 -512 -1360 -512
WIRE -688 -512 -1264 -512
WIRE 80 -512 -688 -512
WIRE -1392 -480 -1392 -512
WIRE 464 -464 -1104 -464
WIRE -176 -416 -928 -416
WIRE -1392 -384 -1392 -400
WIRE -688 -384 -688 -512
WIRE 80 -352 80 -512
WIRE 80 -352 -64 -352
WIRE 224 -352 80 -352
WIRE -64 -320 -64 -352
WIRE 224 -320 224 -352
WIRE -1264 -304 -1264 -512
WIRE -1104 -304 -1104 -464
WIRE -928 -304 -928 -416
WIRE -112 -304 -320 -304
WIRE 400 -304 272 -304
WIRE -688 -272 -688 -304
WIRE -624 -272 -688 -272
WIRE -528 -272 -560 -272
WIRE -112 -256 -128 -256
WIRE 288 -256 272 -256
WIRE -688 -208 -688 -272
WIRE -176 -192 -176 -416
WIRE -64 -192 -64 -240
WIRE -64 -192 -176 -192
WIRE 80 -192 -64 -192
WIRE 224 -192 224 -240
WIRE 464 -192 464 -464
WIRE 464 -192 224 -192
WIRE 592 -192 464 -192
WIRE 896 -192 656 -192
WIRE 992 -192 896 -192
WIRE 1056 -192 992 -192
WIRE 1184 -192 1136 -192
WIRE 1216 -192 1184 -192
WIRE 1280 -192 1216 -192
WIRE 1344 -192 1280 -192
WIRE 1392 -192 1344 -192
WIRE 896 -176 896 -192
WIRE 1280 -176 1280 -192
WIRE 1392 -176 1392 -192
WIRE -64 -160 -64 -192
WIRE 224 -160 224 -192
WIRE 464 -160 464 -192
WIRE 848 -160 832 -160
WIRE 992 -160 992 -192
WIRE -1024 -144 -1056 -144
WIRE -928 -144 -928 -224
WIRE -928 -144 -944 -144
WIRE -880 -144 -928 -144
WIRE -320 -144 -320 -304
WIRE -320 -144 -496 -144
WIRE -112 -144 -256 -144
WIRE 336 -144 272 -144
WIRE 592 -144 592 -192
WIRE 656 -144 656 -192
WIRE 848 -112 752 -112
WIRE -112 -96 -128 -96
WIRE 288 -96 272 -96
WIRE -1200 -80 -1232 -80
WIRE -1104 -80 -1104 -224
WIRE -1104 -80 -1120 -80
WIRE -880 -80 -1104 -80
WIRE -256 -80 -256 -144
WIRE -256 -80 -496 -80
WIRE 464 -80 464 -96
WIRE 896 -80 896 -96
WIRE 992 -80 992 -96
WIRE 1280 -80 1280 -112
WIRE 1392 -80 1392 -96
WIRE 80 -32 80 -192
WIRE 464 -32 80 -32
WIRE 592 -32 592 -64
WIRE 592 -32 464 -32
WIRE 656 -32 656 -64
WIRE 896 -32 656 -32
WIRE 992 -32 896 -32
WIRE 1056 -32 992 -32
WIRE 1184 -32 1184 -192
WIRE 1184 -32 1136 -32
WIRE -1360 -16 -1392 -16
WIRE -1264 -16 -1264 -224
WIRE -1264 -16 -1280 -16
WIRE -880 -16 -1264 -16
WIRE -464 -16 -496 -16
WIRE -448 -16 -464 -16
WIRE -368 -16 -384 -16
WIRE 992 -16 992 -32
WIRE 464 0 464 -32
WIRE 896 0 896 -32
WIRE -64 16 -64 -80
WIRE 80 16 -64 16
WIRE 224 16 224 -80
WIRE 224 16 80 16
WIRE 848 16 832 16
WIRE -880 48 -912 48
WIRE -464 48 -464 -16
WIRE -464 48 -496 48
WIRE -224 48 -464 48
WIRE 80 48 80 16
WIRE 80 48 -144 48
WIRE 1216 48 1216 -192
WIRE 80 64 80 48
WIRE 848 64 800 64
WIRE 992 64 992 48
WIRE 464 80 464 64
WIRE 896 96 896 80
WIRE -992 112 -1024 112
WIRE -880 112 -912 112
WIRE -256 112 -496 112
WIRE 80 160 80 144
WIRE 1216 160 1216 128
WIRE 1216 160 896 160
WIRE -304 176 -496 176
WIRE 1216 176 1216 160
WIRE -256 208 -256 112
WIRE 336 208 336 -144
WIRE 336 208 -256 208
WIRE -1104 240 -1136 240
WIRE -1008 240 -1040 240
WIRE -880 240 -928 240
WIRE -352 240 -496 240
WIRE -304 240 -304 176
WIRE 400 240 400 -304
WIRE 400 240 -304 240
WIRE -352 272 -352 240
WIRE 752 272 752 -112
WIRE 752 272 -352 272
WIRE 1216 272 1216 256
WIRE -1136 304 -1136 240
WIRE -880 304 -1136 304
WIRE 800 304 800 64
WIRE 800 304 -496 304
WIRE -800 384 -800 368
WIRE -688 384 -688 368
WIRE -576 384 -576 368
WIRE -800 464 -800 448
WIRE -688 464 -688 448
WIRE -1136 512 -1136 304
WIRE 896 512 896 160
WIRE 896 512 -1136 512
FLAG -128 -256 0
FLAG -128 -96 0
FLAG 288 -96 0
FLAG 288 -256 0
FLAG 80 160 0
FLAG -1392 -16 0
FLAG -1392 -384 0
FLAG -800 464 0
FLAG -688 464 0
FLAG -576 384 0
FLAG -1024 112 0
FLAG -1232 -80 0
FLAG -1056 -144 0
FLAG 1280 -80 0
FLAG 1216 272 0
FLAG 832 -160 0
FLAG 832 16 0
FLAG 896 96 0
FLAG 896 -80 0
FLAG 1392 -80 0
FLAG -528 -272 0
FLAG -368 -16 0
FLAG 1344 -192 OUT
FLAG 992 64 0
FLAG 992 -80 0
FLAG 464 80 0
FLAG 464 -80 0
FLAG -1360 -512 IN
SYMBOL RES -896 96 R90
SYMATTR InstName R1
SYMATTR Value 10K
SYMBOL SW -64 -224 M180
SYMATTR InstName S1
SYMBOL sw -64 -64 M180
SYMATTR InstName S2
SYMBOL sw 224 -224 R180
SYMATTR InstName S3
SYMBOL sw 224 -64 R180
SYMATTR InstName S4
SYMBOL res -704 -400 R0
SYMATTR InstName R2
SYMATTR Value 100
SYMBOL res 64 48 R0
SYMATTR InstName R3
SYMATTR Value 100m
SYMBOL ind2 576 -160 R0
SYMATTR InstName L1
SYMATTR Value 1m
SYMBOL VOLTAGE -1392 -496 R0
SYMATTR InstName V1
SYMATTR Value 48
SYMBOL res -1280 -320 R0
SYMATTR InstName R4
SYMATTR Value 310K
SYMBOL res -1264 -32 R90
SYMATTR InstName R5
SYMATTR Value 10K
SYMBOL RES -912 224 R90
SYMATTR InstName R6
SYMATTR Value 5K
SYMBOL cap -816 384 R0
SYMATTR InstName C1
SYMATTR Value 1n
SYMBOL cap -704 384 R0
SYMATTR InstName C2
SYMATTR Value 152p
SYMBOL res -1120 -320 R0
SYMATTR InstName R7
SYMATTR Value 28K
SYMBOL res -1104 -96 R90
SYMATTR InstName R8
SYMATTR Value 1K
SYMBOL res -944 -320 R0
SYMATTR InstName R9
SYMATTR Value 28K
SYMBOL res -928 -160 R90
SYMATTR InstName R10
SYMATTR Value 1K
SYMBOL ind2 672 -160 M0
SYMATTR InstName L2
SYMATTR Value 0.2m
SYMBOL ind 1040 -176 R270
SYMATTR InstName L3
SYMATTR Value 2.4
SYMBOL sw 896 96 M180
SYMATTR InstName S5
SYMATTR Value SR
SYMBOL ind 1040 -16 R270
SYMATTR InstName L4
SYMATTR Value 2.4
SYMBOL cap 1264 -176 R0
SYMATTR Value 100
SYMATTR SpiceLine Rser=50m
SYMATTR InstName C3
SYMBOL res 1200 32 R0
SYMATTR InstName R11
SYMATTR Value 3.15K
SYMBOL res 1200 160 R0
SYMATTR InstName R12
SYMATTR Value 1K
SYMBOL sw 896 -80 M180
SYMATTR InstName S6
SYMATTR Value SR
SYMBOL cap -624 -256 R270
SYMATTR InstName C4
SYMATTR Value 100
SYMBOL res -128 32 R90
SYMATTR InstName R13
SYMATTR Value 510
SYMBOL cap -384 -32 R90
SYMATTR InstName C5
SYMATTR Value 100p
SYMBOL cap -1040 224 R90
SYMATTR InstName C6
SYMATTR Value 1n
SYMBOL diode 976 48 M180
SYMATTR InstName D1
SYMATTR Value DD
SYMBOL diode 976 -96 M180
SYMATTR InstName D2
SYMATTR Value DD
SYMBOL cap 448 -160 R0
SYMATTR Value 2n
SYMATTR InstName C7
SYMBOL cap 448 0 R0
SYMATTR Value 2n
SYMATTR InstName C8
SYMBOL res 1376 -192 R0
SYMATTR InstName Rload
SYMATTR Value 5
SYMBOL LTC1922-1 -688 80 R0
SYMATTR InstName U1