Version 4 SHEET 1 1888 772 WIRE -560 -304 -640 -304 WIRE -192 -304 -560 -304 WIRE -32 -304 -192 -304 WIRE 272 -304 -32 -304 WIRE 448 -304 272 -304 WIRE -640 -288 -640 -304 WIRE 272 -288 272 -304 WIRE 448 -288 448 -304 WIRE -32 -240 -32 -304 WIRE 224 -208 128 -208 WIRE -640 -192 -640 -208 WIRE -192 -176 -192 -304 WIRE 272 -176 272 -192 WIRE 272 -176 208 -176 WIRE 528 -176 272 -176 WIRE 624 -176 576 -176 WIRE 704 -176 688 -176 WIRE 736 -176 704 -176 WIRE 848 -176 816 -176 WIRE 1008 -176 848 -176 WIRE 1120 -176 1008 -176 WIRE 272 -160 272 -176 WIRE 528 -160 528 -176 WIRE 576 -160 576 -176 WIRE 848 -160 848 -176 WIRE 1008 -160 1008 -176 WIRE 704 -144 704 -176 WIRE -32 -96 -32 -160 WIRE -32 -96 -144 -96 WIRE 272 -80 272 -96 WIRE 448 -64 448 -224 WIRE 528 -64 528 -80 WIRE 528 -64 448 -64 WIRE 576 -64 576 -80 WIRE 704 -64 704 -80 WIRE 704 -64 576 -64 WIRE 848 -64 848 -96 WIRE 848 -64 704 -64 WIRE 1008 -64 1008 -80 WIRE 1008 -64 848 -64 WIRE 448 -48 448 -64 WIRE 1008 -48 1008 -64 WIRE -448 0 -512 0 WIRE -352 0 -384 0 WIRE -304 0 -352 0 WIRE -192 0 -192 -80 WIRE -192 0 -224 0 WIRE -144 0 -192 0 WIRE 48 0 -80 0 WIRE 208 0 208 -176 WIRE 208 0 112 0 WIRE -512 16 -512 0 WIRE -352 16 -352 0 WIRE 1120 16 1120 -176 WIRE 1344 16 1120 16 WIRE 1488 16 1408 16 WIRE 400 32 288 32 WIRE 448 48 368 48 WIRE 448 64 448 48 WIRE -32 80 -32 -96 WIRE 48 80 48 0 WIRE 128 80 128 -208 WIRE 208 80 208 0 WIRE 288 80 288 32 WIRE 368 80 368 48 WIRE -352 96 -352 80 WIRE 1120 96 1120 16 WIRE 1200 96 1120 96 WIRE 1488 96 1488 16 WIRE 1488 96 1280 96 WIRE 1504 96 1488 96 WIRE 1600 96 1584 96 WIRE -512 112 -512 96 WIRE 1296 144 1168 144 WIRE 1488 144 1488 96 WIRE 1488 144 1360 144 WIRE -560 160 -560 -304 WIRE -464 160 -560 160 WIRE -288 160 -384 160 WIRE -80 160 -288 160 WIRE 448 160 448 144 WIRE -288 176 -288 160 WIRE 528 192 416 192 WIRE 624 192 528 192 WIRE 896 192 816 192 WIRE 1120 192 1120 96 WIRE 1120 192 960 192 WIRE 528 208 528 192 WIRE 624 256 608 256 WIRE -288 272 -288 256 WIRE -192 272 -192 0 WIRE -80 272 -192 272 WIRE 528 288 528 272 WIRE 1168 288 1168 144 WIRE 1168 288 816 288 WIRE 1200 288 1168 288 WIRE 1488 288 1488 144 WIRE 1488 288 1456 288 WIRE -560 352 -560 160 WIRE -192 352 -192 336 WIRE 464 352 416 352 WIRE 1200 352 1168 352 WIRE 1488 352 1456 352 WIRE 464 368 464 352 WIRE -80 384 -160 384 WIRE -160 400 -160 384 WIRE 1120 416 1120 192 WIRE 1200 416 1120 416 WIRE 1488 416 1456 416 WIRE 464 464 464 448 WIRE 176 480 176 464 WIRE 320 480 320 464 WIRE 1200 480 1168 480 WIRE 1488 480 1456 480 WIRE -560 512 -560 432 WIRE 32 512 32 464 WIRE 32 512 -560 512 WIRE 32 592 32 576 FLAG 320 480 0 FLAG 176 480 0 FLAG 464 464 0 FLAG -288 272 0 FLAG -640 -192 0 FLAG -192 352 0 FLAG 448 160 0 FLAG 272 -80 0 FLAG 1008 -48 0 FLAG 528 288 0 FLAG 32 592 0 FLAG -160 464 0 FLAG 608 256 0 FLAG 1488 480 0 FLAG 1488 416 0 FLAG 1600 96 0 FLAG 1008 -176 OUT FLAG -512 112 0 FLAG -352 96 0 FLAG -640 -304 IN SYMBOL PowerProducts\\LTC3705 176 272 R0 SYMATTR InstName U1 SYMBOL res 448 352 R0 SYMATTR InstName R1 SYMATTR Value 100K SYMBOL nmos -144 -176 M0 WINDOW 0 35 -11 Right 2 WINDOW 3 37 100 Right 2 SYMATTR InstName Q1 SYMATTR Value BSS123 SYMBOL res -48 -256 R0 SYMATTR InstName R2 SYMATTR Value 100K SYMBOL res -480 176 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R3 SYMATTR Value 365K SYMBOL res -304 160 R0 WINDOW 3 33 79 Left 2 SYMATTR Value 15K SYMATTR InstName R4 SYMBOL voltage -640 -304 R0 SYMATTR InstName V1 SYMATTR Value 50 SYMBOL cap -208 272 R0 WINDOW 0 31 20 Left 2 SYMATTR InstName C1 SYMATTR Value 2.2µ SYMBOL nmos 400 -48 R0 SYMATTR InstName Q2 SYMATTR Value Si4484EY SYMBOL res 432 48 R0 SYMATTR InstName R5 SYMATTR Value 25m SYMBOL nmos 224 -288 R0 SYMATTR InstName Q3 SYMATTR Value Si4484EY SYMBOL ind2 512 -64 M180 WINDOW 0 2 68 Right 2 WINDOW 3 3 43 Right 2 SYMATTR InstName L1 SYMATTR Value 500µ SYMATTR Type ind SYMBOL ind2 592 -64 R180 WINDOW 0 0 69 Right 2 WINDOW 3 0 41 Right 2 SYMATTR InstName L2 SYMATTR Value 281µ SYMATTR Type ind SYMBOL cap 112 -16 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C2 SYMATTR Value .22µ SYMBOL diode -144 16 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D1 SYMATTR Value 1N914 SYMBOL schottky 432 -224 M180 WINDOW 0 23 66 Left 2 WINDOW 3 23 4 Left 2 SYMATTR InstName D2 SYMATTR Value MBR20100CT SYMATTR Description Diode SYMATTR Type diode SYMBOL schottky 256 -96 M180 WINDOW 0 23 66 Left 2 WINDOW 3 23 2 Left 2 SYMATTR InstName D3 SYMATTR Value MBR20100CT SYMATTR Description Diode SYMATTR Type diode SYMBOL schottky 624 -160 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D4 SYMATTR Value 1N5817 SYMATTR Description Diode SYMATTR Type diode SYMBOL schottky 688 -80 M180 WINDOW 0 24 72 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D5 SYMATTR Value 1N5817 SYMATTR Description Diode SYMATTR Type diode SYMBOL cap 832 -160 R0 WINDOW 3 40 35 Left 2 WINDOW 39 22 63 Left 2 SYMATTR Value 75µ SYMATTR SpiceLine Rser=0.015 SYMATTR InstName C3 SYMBOL res -576 448 M180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R6 SYMATTR Value 301K SYMBOL cap 16 512 R0 WINDOW 0 24 14 Left 2 WINDOW 3 25 58 Left 2 SYMATTR InstName C4 SYMATTR Value 270p SYMBOL cap -176 400 R0 WINDOW 0 24 14 Left 2 WINDOW 3 25 50 Left 2 SYMATTR InstName C5 SYMATTR Value .001µ SYMBOL cap 512 208 R0 SYMATTR InstName C6 SYMATTR Value 470p SYMBOL optos\\MOC207 720 256 M0 SYMATTR InstName U2 SYMBOL LT1431 1328 384 R0 WINDOW 0 0 -65 Center 2 SYMATTR InstName U3 SYMBOL cap 1360 128 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 WINDOW 123 60 32 VTop 2 WINDOW 39 88 32 VTop 2 SYMATTR InstName C7 SYMATTR Value {.047µ/5} SYMATTR Value2 Rser=3K SYMATTR SpiceLine Cpar={4.7u/500} SYMBOL cap 960 176 R90 WINDOW 0 -3 33 VBottom 2 WINDOW 3 33 31 VTop 2 WINDOW 39 61 32 VTop 2 SYMATTR InstName C8 SYMATTR Value {.018µ/2.5} SYMATTR SpiceLine Rpar={2K*5} SYMBOL res 1184 112 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R7 SYMATTR Value 9.53K SYMBOL res 1488 112 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R8 SYMATTR Value 2.49K SYMBOL cap 1344 32 R270 WINDOW 123 -24 29 VBottom 2 WINDOW 0 34 34 VTop 2 WINDOW 3 -1 33 VBottom 2 SYMATTR Value2 Rser=910 SYMATTR InstName C9 SYMATTR Value {4.7n/5} SYMBOL ind2 -496 112 R180 WINDOW 0 0 69 Right 2 WINDOW 3 0 41 Right 2 SYMATTR InstName L3 SYMATTR Value 281µ SYMATTR Type ind SYMBOL schottky -448 16 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D6 SYMATTR Value 1N5817 SYMATTR Description Diode SYMATTR Type diode SYMBOL schottky -368 80 M180 WINDOW 0 35 55 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D7 SYMATTR Value 1N5817 SYMATTR Description Diode SYMATTR Type diode SYMBOL ind -208 16 M270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L4 SYMATTR Value 1m SYMBOL res 992 -176 R0 SYMATTR InstName Rload SYMATTR Value 6 SYMBOL ind2 720 -160 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L5 SYMATTR Value 25µ SYMATTR Type ind TEXT 544 -176 Bottom 2 !K1 L1 L2 L3 1. TEXT 656 424 Left 2 !.tran 600u startup