* SPICE netlist
R1 N016 0 48.7K
V1 IN 0 24
L1 N004 N006 22 Rser=10m
D1 0 N004 B520C
C1 N004 N002 .1
D2 OUT1 N002 1N5817
R2 OUT1 N008 113K
R3 N008 0 8.06K
C2 N013 0 680p Rser=15K Cpar=33p
C3 N011 0 .01
R4 N015 0 100K
C4 OUT1 0 47 V=6.3 Irms=0 Rser=0.002 Lser=0 mfg="TDK" pn="C4532X5ROJ47@M" type="X5R"
Rload1 OUT1 0 12
L2 N003 N005 2.2 Rser=50m
D3 0 N003 B520C
R5 OUT2 N007 42.2K
R6 N007 0 8.06K
C6 N012 0 680p Rser=10K Cpar=33p
C7 N009 0 .01
C8 OUT2 0 47 V=6.3 Irms=1.5 Rser=0.04 Lser=0 mfg="KEMET" pn="T520B476M006ASE040" type="Tantalum"
Rload2 OUT2 0 2.5
R7 OUT1 N010 100K
R8 N017 0 102K
R9 N014 0 60.4K
C9 OUT2 N007 47p
C5 N003 N001 .1
D4 OUT1 N001 1N5817
XU1 N002 N010 N008 N008 N007 N008 N009 N001 OUT2 MP_01 N005 MP_02 N003 OUT1 OUT1 N009 N014 N012 N017 MP_03 NC_04 N016 N013 N015 N011 IN IN N004 MP_05 N006 MP_06 OUT1 0 LT3992 ;pnba Bst1)CMPO1)CMPI1)FB1)FB2)CMPI2)CMPO2)Bst2)Vout2))IND2))SW2)Vin2)SHDN2)SS2)Ilim2)Vc2)DIV))CLKOUT)Rt)Vc1)Ilim1)SS1)SHDN1)Vin1)SW1))IND1))Vout1)GND
.tran 1.5m startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1312 1280
WIRE -80 -640 -288 -640
WIRE 544 -640 -80 -640
WIRE 240 -608 112 -608
WIRE 320 -608 240 -608
WIRE -80 -592 -80 -640
WIRE 112 -592 112 -608
WIRE 320 -592 320 -608
WIRE -288 -528 -288 -640
WIRE -192 -528 -288 -528
WIRE 240 -528 240 -608
WIRE 240 -528 224 -528
WIRE -288 -512 -288 -528
WIRE 320 -496 320 -512
WIRE -288 -432 -288 -448
WIRE -192 -432 -288 -432
WIRE 272 -432 224 -432
WIRE 336 -432 272 -432
WIRE 544 -432 544 -640
WIRE 544 -432 400 -432
WIRE -288 -416 -288 -432
WIRE 272 -416 272 -432
WIRE -288 -336 -288 -352
WIRE -288 -336 -416 -336
WIRE -192 -336 -288 -336
WIRE 272 -336 272 -352
WIRE 272 -336 224 -336
WIRE 384 -336 272 -336
WIRE -416 -320 -416 -336
WIRE -288 -320 -288 -336
WIRE 272 -320 272 -336
WIRE 384 -320 384 -336
WIRE -416 -240 -416 -256
WIRE -192 -240 -288 -240
WIRE 272 -240 224 -240
WIRE 384 -240 384 -256
WIRE -512 -144 -640 -144
WIRE -432 -144 -512 -144
WIRE -320 -144 -432 -144
WIRE -192 -144 -320 -144
WIRE 352 -144 224 -144
WIRE 416 -144 352 -144
WIRE 544 -144 544 -432
WIRE 544 -144 416 -144
WIRE 656 -144 544 -144
WIRE -640 -128 -640 -144
WIRE -512 -128 -512 -144
WIRE -320 -128 -320 -144
WIRE 544 -128 544 -144
WIRE 656 -128 656 -144
WIRE -432 -48 -432 -64
WIRE -320 -48 -320 -64
WIRE -320 -48 -432 -48
WIRE -192 -48 -320 -48
WIRE 256 -48 224 -48
WIRE 384 -48 256 -48
WIRE 416 -48 416 -64
WIRE 416 -48 384 -48
WIRE -640 -32 -640 -48
WIRE -512 -32 -512 -64
WIRE -432 -32 -432 -48
WIRE 416 -32 416 -48
WIRE 544 -32 544 -64
WIRE 656 -32 656 -48
WIRE -192 48 -352 48
WIRE 256 48 256 -48
WIRE 256 48 224 48
WIRE -432 64 -432 48
WIRE 416 64 416 48
WIRE -192 144 -208 144
WIRE 256 144 224 144
WIRE 352 144 352 -144
WIRE 352 144 336 144
WIRE -288 240 -304 240
WIRE -208 240 -208 144
WIRE -208 240 -224 240
WIRE -192 240 -208 240
WIRE 240 240 224 240
WIRE 336 240 304 240
WIRE -512 336 -544 336
WIRE -192 336 -448 336
WIRE 480 336 224 336
WIRE 576 336 544 336
WIRE -288 432 -304 432
WIRE -192 432 -208 432
WIRE 240 432 224 432
WIRE 336 432 320 432
WIRE -80 512 -80 496
WIRE 16 512 16 496
WIRE 112 512 112 496
WIRE -80 608 -80 592
WIRE 112 608 112 592
WIRE -352 640 -352 48
WIRE 384 640 384 -48
WIRE 384 640 -352 640
FLAG 16 512 0
FLAG -80 608 0
FLAG 320 -496 0
FLAG 384 -240 0
FLAG 416 64 0
FLAG 576 336 0
FLAG 336 240 0
FLAG 336 432 0
FLAG 544 -32 0
FLAG 656 -32 0
FLAG 656 -144 OUT1
FLAG 320 -608 IN
FLAG -416 -240 0
FLAG -432 64 0
FLAG -544 336 0
FLAG -304 240 0
FLAG -512 -32 0
FLAG -640 -32 0
FLAG -640 -144 OUT2
FLAG 112 608 0
FLAG -304 432 0
SYMBOL res -96 496 R0
SYMATTR InstName R1
SYMATTR Value 48.7K
SYMBOL voltage 320 -608 R0
SYMATTR InstName V1
SYMATTR Value 24
SYMBOL ind 256 -336 R0
SYMATTR InstName L1
SYMATTR Value 22
SYMATTR SpiceLine Rser=10m
SYMBOL schottky 368 -256 M180
SYMATTR InstName D1
SYMATTR Value B520C
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 256 -352 M180
SYMATTR InstName C1
SYMATTR Value .1
SYMBOL schottky 400 -416 M270
SYMATTR InstName D2
SYMATTR Value 1N5817
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 400 -160 R0
SYMATTR InstName R2
SYMATTR Value 113K
SYMBOL res 400 -48 R0
SYMATTR InstName R3
SYMATTR Value 8.06K
SYMBOL cap 480 352 R270
SYMATTR InstName C2
SYMATTR Value 680p
SYMATTR SpiceLine Rser=15K Cpar=33p
SYMBOL cap 240 256 R270
SYMATTR InstName C3
SYMATTR Value .01
SYMBOL res 224 448 R270
SYMATTR InstName R4
SYMATTR Value 100K
SYMBOL cap 528 -128 R0
SYMATTR Value 47
SYMATTR InstName C4
SYMATTR SpiceLine V=6.3 Irms=0 Rser=0.002 Lser=0 mfg="TDK" pn="C4532X5ROJ47@M" type="X5R"
SYMBOL res 640 -144 R0
SYMATTR InstName Rload1
SYMATTR Value 12
SYMBOL ind -272 -336 M0
SYMATTR InstName L2
SYMATTR Value 2.2
SYMATTR SpiceLine Rser=50m
SYMBOL schottky -432 -256 M180
SYMATTR InstName D3
SYMATTR Value B520C
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res -448 -160 R0
SYMATTR InstName R5
SYMATTR Value 42.2K
SYMBOL res -448 -48 R0
SYMATTR InstName R6
SYMATTR Value 8.06K
SYMBOL cap -448 352 M270
SYMATTR InstName C6
SYMATTR Value 680p
SYMATTR SpiceLine Rser=10K Cpar=33p
SYMBOL cap -224 256 M270
SYMATTR InstName C7
SYMATTR Value .01
SYMBOL polcap -528 -128 R0
SYMATTR Value 47
SYMATTR InstName C8
SYMATTR Description Capacitor
SYMATTR Type cap
SYMATTR SpiceLine V=6.3 Irms=1.5 Rser=0.04 Lser=0 mfg="KEMET" pn="T520B476M006ASE040" type="Tantalum"
SYMBOL res -656 -144 R0
SYMATTR InstName Rload2
SYMATTR Value 2.5
SYMBOL res 352 128 R90
SYMATTR InstName R7
SYMATTR Value 100K
SYMBOL res 96 496 R0
SYMATTR InstName R8
SYMATTR Value 102K
SYMBOL res -192 448 M270
SYMATTR InstName R9
SYMATTR Value 60.4K
SYMBOL cap -336 -128 R0
SYMATTR InstName C9
SYMATTR Value 47p
SYMBOL cap -304 -352 M180
SYMATTR InstName C5
SYMATTR Value .1
SYMBOL schottky -304 -512 R0
SYMATTR InstName D4
SYMATTR Value 1N5817
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL PowerProducts\\LT3992 16 -48 R0
SYMATTR InstName U1