* SPICE netlist
L1 IN N003 3.3
L2 N002 IN 4.7
D1 N003 +8 1N5819
R1 +8 N004 53.6K
R2 N004 0 10K
C1 +8 0 3.3 x2
C2 N008 0 10n
D2 N002 +24 1N5819
R3 N005 0 10K
R4 +24 N005 182K
C3 +24 0 .22
C4 N001 N003 .68
D3 N001 0 1N5819
D4 -8 N001 1N5819
C5 -8 0 .68
R5 N007 0 2.4K
V1 IN 0 5
XU1 N004 N005 N008 N003 0 IN N002 N006 +24 N007 LT1947 ;pnba FB1)FB2)Ct)SW1)GND)Vin)SW2)_SHDN)Vo2)Von
Rload2 -8 0 800
Rload3 +8 0 40
Rload1 +24 0 5K
.tran 500u startup

* LTspice schematic (.asc)
Version 4
SHEET 1 1120 736
WIRE 48 -368 0 -368
WIRE 160 -368 112 -368
WIRE 256 -368 160 -368
WIRE 384 -368 320 -368
WIRE 560 -368 384 -368
WIRE 160 -352 160 -368
WIRE 384 -352 384 -368
WIRE 560 -352 560 -368
WIRE 48 -288 -368 -288
WIRE -368 -272 -368 -288
WIRE 384 -256 384 -288
WIRE 560 -256 560 -272
WIRE -192 -192 -288 -192
WIRE -64 -192 -128 -192
WIRE -48 -192 -64 -192
WIRE 48 -192 48 -288
WIRE 48 -192 32 -192
WIRE 64 -192 48 -192
WIRE 160 -192 160 -288
WIRE 160 -192 144 -192
WIRE 208 -192 160 -192
WIRE 320 -192 272 -192
WIRE 448 -192 320 -192
WIRE 560 -192 448 -192
WIRE -368 -176 -368 -192
WIRE 560 -176 560 -192
WIRE 320 -160 320 -192
WIRE 448 -160 448 -192
WIRE -64 -112 -64 -192
WIRE 48 -112 48 -192
WIRE 160 -112 160 -192
WIRE 448 -80 448 -96
WIRE 560 -80 560 -96
WIRE -400 -32 -544 -32
WIRE -288 -32 -288 -192
WIRE -288 -32 -400 -32
WIRE -144 -32 -288 -32
WIRE 320 -32 320 -80
WIRE 320 -32 240 -32
WIRE -544 -16 -544 -32
WIRE -400 -16 -400 -32
WIRE -288 -16 -288 -32
WIRE 320 0 320 -32
WIRE -544 80 -544 64
WIRE -400 80 -400 48
WIRE -288 80 -288 64
WIRE -144 80 -288 80
WIRE -288 96 -288 80
WIRE 320 96 320 80
WIRE -288 192 -288 176
WIRE -144 192 -160 192
WIRE 272 192 240 192
WIRE 368 192 352 192
WIRE -48 288 -48 272
WIRE 144 288 144 272
WIRE -48 368 -48 352
FLAG 320 96 0
FLAG 448 -80 0
FLAG 560 -80 0
FLAG -48 368 0
FLAG 144 288 0
FLAG -288 192 0
FLAG -400 80 0
FLAG 384 -256 0
FLAG 0 -368 0
FLAG 560 -256 0
FLAG 368 192 0
FLAG -368 -176 0
FLAG -544 -32 +24
FLAG 560 -368 -8
FLAG 560 -192 +8
FLAG -544 80 0
FLAG -368 -288 IN
SYMBOL ind 48 -176 R270
SYMATTR InstName L1
SYMATTR Value 3.3
SYMBOL ind -64 -176 R270
SYMATTR InstName L2
SYMATTR Value 4.7
SYMBOL schottky 208 -176 R270
SYMATTR InstName D1
SYMATTR Value 1N5819
SYMBOL RES 304 -176 R0
SYMATTR InstName R1
SYMATTR Value 53.6K
SYMBOL res 304 -16 R0
SYMATTR InstName R2
SYMATTR Value 10K
SYMBOL cap 432 -160 R0
SYMATTR Value2 x2
SYMATTR Value 3.3
SYMATTR InstName C1
SYMBOL cap -64 288 R0
SYMATTR InstName C2
SYMATTR Value 10n
SYMBOL schottky -128 -176 M270
SYMATTR InstName D2
SYMATTR Value 1N5819
SYMBOL res -304 80 R0
SYMATTR InstName R3
SYMATTR Value 10K
SYMBOL res -304 -32 R0
SYMATTR InstName R4
SYMATTR Value 182K
SYMBOL cap -416 -16 R0
SYMATTR InstName C3
SYMATTR Value .22
SYMBOL cap 144 -352 R0
SYMATTR InstName C4
SYMATTR Value .68
SYMBOL schottky 112 -352 M270
SYMATTR InstName D3
SYMATTR Value 1N5819
SYMBOL schottky 320 -352 M270
SYMATTR InstName D4
SYMATTR Value 1N5819
SYMBOL cap 368 -352 R0
SYMATTR InstName C5
SYMATTR Value .68
SYMBOL res 256 208 R270
SYMATTR InstName R5
SYMATTR Value 2.4K
SYMBOL VOLTAGE -368 -288 R0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL POWERPRODUCTS\\LT1947 48 80 R0
SYMATTR InstName U1
SYMBOL res 544 -368 R0
SYMATTR InstName Rload2
SYMATTR Value 800
SYMBOL res 544 -192 R0
SYMATTR InstName Rload3
SYMATTR Value 40
SYMBOL res -560 -32 R0
SYMATTR InstName Rload1
SYMATTR Value 5K