Version 4
SHEET 1 1416 1028
WIRE -64 352 -160 352
WIRE 816 352 -64 352
WIRE -160 368 -160 352
WIRE 128 400 32 400
WIRE 272 400 128 400
WIRE 400 400 272 400
WIRE 432 400 400 400
WIRE 528 400 496 400
WIRE 592 400 528 400
WIRE 720 400 656 400
WIRE 32 416 32 400
WIRE 128 432 128 400
WIRE -160 464 -160 448
WIRE 816 480 816 352
WIRE 32 496 32 480
WIRE 272 496 272 400
WIRE 400 496 400 400
WIRE 528 496 528 400
WIRE 48 560 16 560
WIRE 128 560 128 512
WIRE 128 560 112 560
WIRE 192 560 128 560
WIRE 768 560 608 560
WIRE 192 624 176 624
WIRE 624 624 608 624
WIRE 720 624 720 400
WIRE 720 624 704 624
WIRE 816 624 816 576
WIRE 816 624 720 624
WIRE 864 624 816 624
WIRE 976 624 944 624
WIRE 1056 624 976 624
WIRE 1168 624 1056 624
WIRE 816 640 816 624
WIRE 1056 640 1056 624
WIRE 1168 640 1168 624
WIRE -64 688 -64 352
WIRE 16 688 -64 688
WIRE 192 688 96 688
WIRE 704 688 608 688
WIRE 704 720 704 688
WIRE 768 720 704 720
WIRE 1056 736 1056 704
WIRE 1168 736 1168 720
WIRE -64 752 -64 688
WIRE 192 752 -64 752
WIRE 656 752 608 752
WIRE 816 752 816 736
WIRE 976 784 976 624
WIRE -80 816 -128 816
WIRE 32 816 0 816
WIRE 192 816 32 816
WIRE 656 816 608 816
WIRE -128 832 -128 816
WIRE 32 832 32 816
WIRE 192 880 112 880
WIRE 976 880 976 864
WIRE 976 880 608 880
WIRE 112 896 112 880
WIRE 976 896 976 880
WIRE -128 912 -128 896
WIRE 32 912 32 896
WIRE 400 944 400 928
WIRE 112 976 112 960
WIRE 976 992 976 976
FLAG 400 944 0
FLAG 16 560 0
FLAG 112 976 0
FLAG 816 752 0
FLAG 1056 736 0
FLAG 976 992 0
FLAG -128 912 0
FLAG 32 912 0
FLAG -160 464 0
FLAG 32 496 0
FLAG 1168 736 0
FLAG 1168 624 OUT
FLAG -160 352 IN
SYMBOL POWERPRODUCTS\\LTC1649 400 720 R0
SYMATTR InstName U1
SYMBOL NMOS 768 480 R0
SYMATTR InstName Q1
SYMATTR Value Si4420DY
SYMBOL nmos 768 640 R0
SYMATTR InstName Q2
SYMATTR Value Si4410DY
SYMBOL schottky 432 416 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value 1N5818
SYMBOL RES 112 528 M180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R1
SYMATTR Value 22
SYMBOL res 0 704 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
WINDOW 38 0 56 VBottom 2
WINDOW 39 0 56 VBottom 2
WINDOW 40 0 56 VBottom 2
WINDOW 123 0 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 22K
SYMBOL polcap 112 544 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
WINDOW 38 32 32 VTop 2
WINDOW 39 32 32 VTop 2
WINDOW 40 32 32 VTop 2
WINDOW 123 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 10µ
SYMBOL cap 640 752 R0
SYMATTR InstName C2
SYMATTR Value 1µ
SYMBOL ind 848 640 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value 1.2µ
SYMBOL polcap 1040 640 R0
SYMATTR SpiceLine Rser=0.06
SYMATTR InstName C3
SYMATTR Value 4700µ
SYMBOL res 720 608 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 1K
SYMBOL res 960 768 R0
SYMATTR InstName R4
SYMATTR Value 12.4K
SYMBOL res 960 880 R0
SYMATTR InstName R5
SYMATTR Value 12.7K
SYMBOL cap 96 896 R0
SYMATTR InstName C4
SYMATTR Value .001µ
SYMBOL cap 16 832 R0
SYMATTR InstName C5
SYMATTR Value 220p
SYMBOL cap -144 832 R0
SYMATTR InstName C6
SYMATTR Value .01µ
SYMBOL res 16 800 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 7.6K
SYMBOL VOLTAGE -160 352 R0
SYMATTR InstName V1
SYMATTR Value 3.3
SYMBOL cap 656 384 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
WINDOW 38 32 32 VTop 2
WINDOW 39 32 32 VTop 2
WINDOW 40 32 32 VTop 2
WINDOW 123 32 32 VTop 2
SYMATTR InstName C7
SYMATTR Value 1µ
SYMBOL polcap 16 416 R0
SYMATTR InstName C8
SYMATTR Value 10µ
SYMBOL res 1152 624 R0
SYMATTR InstName Rload
SYMATTR Value .5
TEXT 672 928 Left 2 !.tran 2m startup