Version 4 SHEET 1 2644 996 WIRE 1472 -496 -1072 -496 WIRE -720 -448 -1008 -448 WIRE 32 -448 -720 -448 WIRE 976 -448 32 -448 WIRE -1008 -432 -1008 -448 WIRE -608 -400 -912 -400 WIRE -512 -400 -544 -400 WIRE -448 -400 -512 -400 WIRE -352 -400 -384 -400 WIRE -288 -400 -352 -400 WIRE 128 -400 -288 -400 WIRE 544 -400 128 -400 WIRE 608 -400 544 -400 WIRE 640 -400 608 -400 WIRE 768 -400 704 -400 WIRE 816 -400 768 -400 WIRE 1168 -400 880 -400 WIRE -288 -384 -288 -400 WIRE -720 -352 -720 -448 WIRE 976 -352 976 -448 WIRE -1008 -336 -1008 -352 WIRE -512 -336 -512 -400 WIRE 768 -336 768 -400 WIRE -288 -288 -288 -304 WIRE -640 -272 -672 -272 WIRE -352 -272 -352 -400 WIRE -352 -272 -384 -272 WIRE 32 -272 32 -448 WIRE 128 -272 128 -400 WIRE 608 -272 608 -400 WIRE 640 -272 608 -272 WIRE 928 -272 896 -272 WIRE -1072 -192 -1072 -496 WIRE -1024 -192 -1072 -192 WIRE -912 -192 -912 -400 WIRE -912 -192 -944 -192 WIRE -720 -192 -720 -256 WIRE -720 -192 -912 -192 WIRE -640 -192 -720 -192 WIRE -352 -192 -352 -272 WIRE -352 -192 -384 -192 WIRE 608 -192 608 -272 WIRE 640 -192 608 -192 WIRE 976 -192 976 -256 WIRE 976 -192 896 -192 WIRE 1168 -192 1168 -400 WIRE 1168 -192 976 -192 WIRE 1200 -192 1168 -192 WIRE 1312 -192 1280 -192 WIRE 1360 -192 1312 -192 WIRE 1472 -192 1472 -496 WIRE 1472 -192 1360 -192 WIRE 1616 -192 1472 -192 WIRE 1360 -176 1360 -192 WIRE 1472 -176 1472 -192 WIRE 1616 -176 1616 -192 WIRE -640 -112 -672 -112 WIRE -272 -112 -384 -112 WIRE 640 -112 528 -112 WIRE 928 -112 896 -112 WIRE 1360 -80 1360 -112 WIRE 1472 -80 1472 -112 WIRE 1616 -80 1616 -96 WIRE -720 -64 -720 -96 WIRE 976 -64 976 -96 WIRE -512 -32 -512 -48 WIRE 768 -32 768 -48 WIRE -912 -16 -912 -192 WIRE -880 -16 -912 -16 WIRE -320 -16 -800 -16 WIRE -272 -16 -320 -16 WIRE 576 -16 528 -16 WIRE 1008 -16 576 -16 WIRE 1168 -16 1168 -192 WIRE 1168 -16 1088 -16 WIRE -320 0 -320 -16 WIRE 576 0 576 -16 WIRE -1072 80 -1072 -192 WIRE -320 80 -320 64 WIRE -320 80 -1072 80 WIRE -272 80 -320 80 WIRE 576 80 576 64 WIRE 576 80 528 80 WIRE 1312 80 1312 -192 WIRE 1312 80 576 80 WIRE -592 176 -688 176 WIRE -272 176 -592 176 WIRE 608 176 528 176 WIRE -592 192 -592 176 WIRE -592 272 -592 256 WIRE -272 272 -592 272 WIRE 544 272 544 -400 WIRE 544 272 528 272 WIRE -1072 288 -1072 80 WIRE -592 288 -592 272 WIRE -592 368 -592 352 WIRE -272 368 -592 368 WIRE -1072 464 -1072 368 WIRE -272 464 -1072 464 WIRE -1072 480 -1072 464 WIRE -272 560 -288 560 WIRE -1072 576 -1072 560 WIRE -112 832 -112 816 WIRE -16 832 -16 816 WIRE 176 832 176 816 WIRE 368 832 368 816 WIRE 544 832 544 272 WIRE 544 832 368 832 WIRE 272 848 272 816 WIRE -112 928 -112 912 WIRE -16 928 -16 912 WIRE 272 928 272 912 WIRE -688 960 -688 176 WIRE 608 960 608 176 WIRE 608 960 -688 960 FLAG 176 832 0 FLAG -1008 -336 0 FLAG -512 -32 0 FLAG -720 -64 0 FLAG 1360 -80 0 FLAG 1472 -80 0 FLAG 1616 -80 0 FLAG 1616 -192 OUT FLAG -1008 -448 IN FLAG -1072 576 0 FLAG 768 -32 0 FLAG 976 -64 0 FLAG -288 560 0 FLAG -112 928 0 FLAG -16 928 0 FLAG 272 928 0 FLAG -288 -288 0 SYMBOL voltage -1008 -448 R0 SYMATTR InstName V1 SYMATTR Value 12 SYMBOL PowerProducts\\LTC4449 -512 -192 M0 SYMATTR InstName U1 SYMBOL nmos -672 -352 M0 SYMATTR InstName Q1 SYMATTR Value BSC010NE2LS SYMBOL ind -928 -176 M270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L1 SYMATTR Value .47µ SYMATTR SpiceLine Rser=.74m Rpar=5K SYMBOL res -896 -32 M90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R1 SYMATTR Value 2.87K SYMBOL cap -304 0 M0 SYMATTR InstName C1 SYMATTR Value .22µ SYMBOL cap 1344 -176 R0 WINDOW 123 26 65 Left 2 WINDOW 3 41 36 Left 2 SYMATTR Value2 X6 SYMATTR InstName C2 SYMATTR Value 330µ SYMATTR SpiceLine Rser=10m SYMBOL cap 1456 -176 R0 WINDOW 123 21 69 Left 2 WINDOW 3 44 37 Left 2 SYMATTR Value2 X4 SYMATTR InstName C3 SYMATTR Value 100µ SYMATTR SpiceLine Rser=3m SYMBOL res -1088 272 R0 SYMATTR InstName R2 SYMATTR Value 10K SYMBOL res -1088 464 R0 SYMATTR InstName R3 SYMATTR Value 10K SYMBOL schottky -384 -416 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D1 SYMATTR Value 1N5818 SYMATTR Description Diode SYMATTR Type diode SYMBOL cap -544 -416 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C4 SYMATTR Value .22µ SYMBOL cap -608 288 R0 WINDOW 39 25 62 Left 2 WINDOW 3 42 35 Left 2 SYMATTR SpiceLine Rser=280 Rpar=10K SYMATTR Value 3300p SYMATTR InstName C5 SYMBOL PowerProducts\\LTC3861 128 272 R0 SYMATTR InstName U2 SYMBOL nmos -672 -192 M0 SYMATTR InstName Q2 SYMATTR Value BSC010NE2LS SYMBOL PowerProducts\\LTC4449 768 -192 R0 SYMATTR InstName U3 SYMBOL nmos 928 -352 R0 SYMATTR InstName Q3 SYMATTR Value BSC010NE2LS SYMBOL ind 1184 -176 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L2 SYMATTR Value .47µ SYMATTR SpiceLine Rser=.74m Rpar=5K SYMBOL res 1104 -32 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 2.87K SYMBOL cap 560 0 R0 SYMATTR InstName C6 SYMATTR Value .22µ SYMBOL schottky 640 -416 M90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D2 SYMATTR Value 1N5818 SYMATTR Description Diode SYMATTR Type diode SYMBOL cap 816 -416 M90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C7 SYMATTR Value .22µ SYMBOL nmos 928 -192 R0 SYMATTR InstName Q4 SYMATTR Value BSC010NE2LS SYMBOL cap -608 192 R0 WINDOW 39 24 63 Left 2 WINDOW 3 35 34 Left 2 SYMATTR SpiceLine Rser=5.9K Cpar=100p SYMATTR Value 4700p SYMATTR InstName C8 SYMBOL res -128 816 R0 SYMATTR InstName R5 SYMATTR Value 59K SYMBOL res -32 816 R0 SYMATTR InstName R6 SYMATTR Value 28K SYMBOL cap 256 848 R0 SYMATTR InstName C9 SYMATTR Value 100p SYMBOL voltage -288 -400 R0 SYMATTR InstName V2 SYMATTR Value 5 SYMBOL res 1600 -192 R0 SYMATTR InstName Rload SYMATTR Value 20m TEXT 1056 392 Left 2 !.tran 1m startup