Version 4
SHEET 1 1784 680
WIRE 1216 -496 1168 -496
WIRE 1248 -496 1216 -496
WIRE 1568 -496 1536 -496
WIRE 1616 -496 1568 -496
WIRE 1216 -400 1216 -496
WIRE 1248 -400 1216 -400
WIRE 1568 -400 1568 -496
WIRE 1568 -400 1536 -400
WIRE 1392 -240 1392 -336
WIRE 336 -160 -128 -160
WIRE -128 -144 -128 -160
WIRE 464 -80 112 -80
WIRE 656 -80 528 -80
WIRE 944 -80 736 -80
WIRE 1040 -80 944 -80
WIRE 1472 -80 1280 -80
WIRE -128 -48 -128 -64
WIRE 944 -48 944 -80
WIRE 720 0 640 0
WIRE 816 0 720 0
WIRE 1168 0 1152 0
WIRE 1184 0 1168 0
WIRE 640 16 640 0
WIRE 720 16 720 0
WIRE 0 64 -32 64
WIRE 112 64 112 -80
WIRE 112 64 64 64
WIRE 160 64 112 64
WIRE 256 64 224 64
WIRE 944 64 944 16
WIRE 1168 64 1168 0
WIRE 1168 64 944 64
WIRE 1248 64 1168 64
WIRE 1472 64 1472 -80
WIRE 1472 64 1312 64
WIRE 1520 64 1472 64
WIRE 1616 64 1584 64
WIRE 336 96 336 -160
WIRE 816 96 816 0
WIRE 112 112 112 64
WIRE 640 112 640 80
WIRE 720 112 720 96
WIRE 1472 112 1472 64
WIRE -32 176 -32 64
WIRE -32 176 -112 176
WIRE -16 176 -32 176
WIRE 288 176 240 176
WIRE 880 176 864 176
WIRE 1344 176 880 176
WIRE 1616 176 1616 64
WIRE 1616 176 1600 176
WIRE 1696 176 1616 176
WIRE -112 192 -112 176
WIRE 1696 192 1696 176
WIRE -32 256 -32 176
WIRE -16 256 -32 256
WIRE 256 256 256 64
WIRE 256 256 240 256
WIRE 336 256 336 192
WIRE 336 256 256 256
WIRE 512 256 336 256
WIRE 816 256 816 192
WIRE 816 256 592 256
WIRE 880 256 816 256
WIRE 1168 256 1168 64
WIRE 1168 256 880 256
WIRE 1344 256 1168 256
WIRE 1616 256 1616 176
WIRE 1616 256 1600 256
WIRE -112 288 -112 272
WIRE 1696 288 1696 272
WIRE -16 336 -96 336
WIRE 288 336 240 336
WIRE 1344 336 864 336
WIRE 1680 336 1600 336
WIRE -96 368 -96 336
WIRE 336 368 336 352
WIRE 816 368 816 352
WIRE 1680 368 1680 336
WIRE 112 416 112 400
WIRE 1472 416 1472 400
WIRE -96 464 -96 448
WIRE 1680 464 1680 448
FLAG 112 416 0
FLAG -96 464 0
FLAG -112 288 0
FLAG 336 368 0
FLAG -128 -48 0
FLAG 640 112 0
FLAG 720 112 0
FLAG 1472 416 0
FLAG 1680 464 0
FLAG 1696 288 0
FLAG 816 368 0
FLAG 1040 -80 Vin_reg
FLAG 1280 -80 Vout_reg
FLAG 1168 0 gnd_reg
FLAG 1168 -496 Vin_reg
FLAG 1616 -496 Vout_reg
FLAG 1392 -240 gnd_reg
SYMBOL voltage -112 176 R0
WINDOW 3 20 97 Left 2
SYMATTR Value 6
SYMATTR InstName V1
SYMBOL voltage 1680 352 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 6
SYMBOL nmos 288 96 R0
SYMATTR InstName Q1
SYMATTR Value BUK7Y7R640E
SYMBOL nmos 288 256 R0
SYMATTR InstName Q2
SYMATTR Value BUK7Y7R640E
SYMBOL cap 224 48 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 1µ
SYMBOL voltage -128 -160 R0
SYMATTR InstName V3
SYMATTR Value 32
SYMBOL ind 496 272 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value 1µ
SYMBOL cap 624 16 R0
SYMATTR InstName C2
SYMATTR Value 10µ
SYMBOL res 704 0 R0
SYMATTR InstName R1
SYMATTR Value 1
SYMBOL PowerProducts\\LTC4449 112 256 R0
SYMATTR InstName U1
SYMBOL schottky 0 80 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value 1N5819
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL voltage 1696 176 M0
WINDOW 3 20 97 Left 2
SYMATTR Value 6
SYMATTR InstName V4
SYMBOL voltage -96 352 M0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V5
SYMATTR Value PULSE(0 6 0 10n 10n 1u 2u)
SYMBOL nmos 864 96 M0
SYMATTR InstName Q3
SYMATTR Value BUK7Y7R640E
SYMBOL nmos 864 256 M0
SYMATTR InstName Q4
SYMATTR Value BUK7Y7R640E
SYMBOL cap 1248 48 M90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value .1µ
SYMBOL PowerProducts\\LTC4449 1472 256 M0
SYMATTR InstName U2
SYMBOL schottky 1584 80 M270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D2
SYMATTR Value 1N5819
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 864 160 R0
SYMATTR InstName R2
SYMATTR Value {Rp}
SYMBOL schottky 464 -64 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D3
SYMATTR Value 1n4148
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 928 -48 R0
SYMATTR InstName C4
SYMATTR Value 100n
SYMBOL PowerProducts\\LT3008-5 1392 -448 R0
SYMATTR InstName U4
SYMBOL res 752 -96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 10
TEXT 392 440 Left 2 !.tran 2500u startup
TEXT 752 -248 Left 2 !;.step param Rp list 100k 10k 1k\n.param Rp 2.2k
RECTANGLE Normal 1296 16 1024 -96 2