Version 4 SHEET 1 3720 932 WIRE 2832 -288 2800 -288 WIRE 2848 -288 2832 -288 WIRE 3088 -288 3072 -288 WIRE 3184 -288 3168 -288 WIRE 3248 -288 3184 -288 WIRE 3312 -288 3248 -288 WIRE 3328 -288 3312 -288 WIRE 3248 -272 3248 -288 WIRE 3328 -272 3328 -288 WIRE 2768 -192 2720 -192 WIRE 2832 -192 2832 -288 WIRE 2832 -192 2768 -192 WIRE 2848 -192 2832 -192 WIRE 3184 -192 3184 -288 WIRE 3184 -192 3072 -192 WIRE 3248 -144 3248 -208 WIRE 3328 -144 3328 -192 WIRE 3328 -144 3248 -144 WIRE 3120 -96 3072 -96 WIRE 512 -80 400 -80 WIRE 624 -80 512 -80 WIRE 688 -80 624 -80 WIRE 1088 -80 688 -80 WIRE 400 -64 400 -80 WIRE 624 -48 624 -80 WIRE 512 -32 512 -80 WIRE 992 -32 816 -32 WIRE 1472 -32 1056 -32 WIRE 2848 0 2816 0 WIRE 3088 0 3072 0 WIRE 736 16 720 16 WIRE 816 16 816 -32 WIRE 816 16 800 16 WIRE 864 16 816 16 WIRE 976 16 928 16 WIRE 400 32 400 16 WIRE 624 48 624 16 WIRE 2816 48 2816 0 WIRE 3120 48 3120 -96 WIRE 3120 48 2816 48 WIRE 688 64 688 -80 WIRE 816 64 816 16 WIRE 2816 96 2816 48 WIRE 416 112 400 112 WIRE 512 112 512 48 WIRE 512 112 496 112 WIRE 560 112 512 112 WIRE 976 112 976 16 WIRE 976 112 944 112 WIRE 1088 112 1088 -80 WIRE 2768 176 2768 -128 WIRE 2816 176 2816 160 WIRE 2816 176 2768 176 WIRE 3088 176 3088 0 WIRE 3088 176 2816 176 WIRE 3200 176 3088 176 WIRE 3328 176 3328 -144 WIRE 3328 176 3200 176 WIRE 3408 176 3328 176 WIRE 464 192 432 192 WIRE 560 192 528 192 WIRE 1040 192 944 192 WIRE 560 272 528 272 WIRE 976 272 976 176 WIRE 976 272 944 272 WIRE 1088 272 1088 208 WIRE 1088 272 976 272 WIRE 1136 272 1088 272 WIRE 1168 272 1136 272 WIRE 1264 272 1248 272 WIRE 1280 272 1264 272 WIRE 1376 272 1360 272 WIRE 1408 272 1376 272 WIRE 1440 272 1408 272 WIRE 1472 272 1472 -32 WIRE 1472 272 1440 272 WIRE 1504 272 1472 272 WIRE 1536 272 1504 272 WIRE 1648 272 1616 272 WIRE 1680 272 1648 272 WIRE 2000 272 1680 272 WIRE 2080 272 2000 272 WIRE 2240 272 2160 272 WIRE 2416 272 2320 272 WIRE 2720 272 2720 -192 WIRE 2720 272 2416 272 WIRE 3200 272 2720 272 WIRE 3232 272 3200 272 WIRE 3312 272 3232 272 WIRE 1136 304 1136 272 WIRE 3200 304 3200 272 WIRE 1376 320 1376 272 WIRE 1680 320 1680 272 WIRE 464 352 432 352 WIRE 560 352 544 352 WIRE 1040 352 944 352 WIRE 1088 384 1088 368 WIRE 1136 384 1136 368 WIRE 1504 384 1504 272 WIRE 1520 384 1504 384 WIRE 1648 384 1648 272 WIRE 1648 384 1616 384 WIRE 2000 384 2000 272 WIRE 2416 384 2416 272 WIRE 384 432 368 432 WIRE 464 432 448 432 WIRE 560 432 544 432 WIRE 1264 432 1264 272 WIRE 1264 432 944 432 WIRE 3200 432 3200 384 WIRE 1504 448 1504 384 WIRE 1376 496 1376 384 WIRE 560 512 528 512 WIRE 1136 512 944 512 WIRE 3152 512 2960 512 WIRE 1136 528 1136 512 WIRE 1440 528 1440 272 WIRE 1440 528 1136 528 WIRE 1680 544 1680 400 WIRE 2000 544 2000 448 WIRE 2000 544 1680 544 WIRE 2096 544 2000 544 WIRE 2272 544 2176 544 WIRE 2416 544 2416 448 WIRE 2416 544 2352 544 WIRE 2896 544 2416 544 WIRE 3200 544 3200 528 WIRE 3200 544 2896 544 WIRE 3408 544 3408 176 WIRE 3408 544 3200 544 WIRE 320 560 144 560 WIRE 1504 560 1504 528 WIRE 1536 560 1536 432 WIRE 1536 560 1504 560 WIRE 1680 560 1680 544 WIRE 144 576 144 560 WIRE 688 576 688 560 WIRE 816 576 816 560 WIRE 320 608 320 560 WIRE 400 608 320 608 WIRE 416 608 400 608 WIRE 528 608 528 512 WIRE 528 608 496 608 WIRE 992 608 528 608 WIRE 1440 608 1440 528 WIRE 1440 608 1072 608 WIRE 2960 608 2960 512 WIRE 320 640 320 608 WIRE 1536 640 1536 560 WIRE 1536 640 1424 640 WIRE 144 672 144 640 WIRE 400 672 400 608 WIRE 32 688 -320 688 WIRE 208 688 112 688 WIRE 256 688 208 688 WIRE 1424 704 1424 640 WIRE 2896 720 2896 544 WIRE 2960 720 2960 688 WIRE 2960 720 2896 720 WIRE -320 752 -320 688 WIRE 208 752 208 688 WIRE 320 768 320 736 WIRE 400 768 400 752 WIRE 400 768 320 768 WIRE 400 784 400 768 WIRE 1376 784 1264 784 WIRE 1264 800 1264 784 WIRE 1424 832 1424 800 WIRE -320 880 -320 832 WIRE 208 880 208 832 WIRE 1264 912 1264 880 FLAG 1088 384 0 FLAG 368 432 0 FLAG 816 576 0 FLAG 1376 496 0 FLAG 1680 560 0 FLAG 400 32 0 FLAG 400 -80 IN FLAG 1136 384 0 FLAG 688 576 0 FLAG 432 192 0 FLAG 528 272 0 FLAG 432 352 0 FLAG 720 16 0 FLAG 400 112 0 FLAG 400 784 0 FLAG 208 880 0 FLAG -320 880 0 FLAG 1424 832 0 FLAG 1264 912 0 FLAG 1680 272 Vtoline FLAG 3232 272 loadv FLAG 3312 -288 3.3Vout FLAG 2800 -288 3p3vinput FLAG 624 48 0 FLAG 144 672 0 FLAG 3200 176 deviceCommon FLAG 1408 272 psOut SYMBOL nmos 1040 112 R0 SYMATTR InstName Q1 SYMATTR Value Si7370DP SYMBOL nmos 1040 272 R0 WINDOW 0 -2 31 Right 0 WINDOW 3 38 104 Right 0 SYMATTR InstName Q2 SYMATTR Value Si7370DP SYMBOL schottky 864 32 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName D1 SYMATTR Value MBRS140 SYMATTR Description Diode SYMATTR Type diode SYMBOL cap 960 112 R0 SYMATTR InstName C1 SYMATTR Value 1µ SYMBOL res 496 -48 R0 SYMATTR InstName R1 SYMATTR Value 1Meg SYMBOL res 560 416 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R2 SYMATTR Value 20K SYMBOL cap 448 416 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C2 SYMATTR Value 2200p SYMBOL schottky 1120 368 M180 WINDOW 0 24 72 Left 0 WINDOW 3 20 1 Left 0 SYMATTR InstName D2 SYMATTR Value MBRS1100 SYMATTR Description Diode SYMATTR Type diode SYMBOL ind 1152 288 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 5 56 VBottom 0 SYMATTR InstName L1 SYMATTR Value 15µ SYMATTR SpiceLine Rpar=2K SYMBOL res 1264 288 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R3 SYMATTR Value 2m SYMBOL res 560 336 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R4 SYMATTR Value 49.9K SYMBOL cap 528 176 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C3 SYMATTR Value .002µ SYMBOL cap 1360 320 R0 SYMATTR InstName C4 SYMATTR Value 100µ SYMBOL voltage 400 -80 R0 WINDOW 3 25 101 Left 0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR Value 48 SYMATTR InstName V1 SYMBOL diode 1056 -48 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName D3 SYMATTR Value 1N4148 SYMBOL PowerProducts\\LT3845 752 304 R0 SYMATTR InstName U1 SYMBOL res 976 624 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R5 SYMATTR Value 187690 SYMBOL res 400 624 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R6 SYMATTR Value 12310 SYMBOL cap 800 0 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C5 SYMATTR Value 1µ SYMBOL res 512 96 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R7 SYMATTR Value 82.5K SYMBOL res 384 656 R0 SYMATTR InstName R8 SYMATTR Value 13715 SYMBOL res 192 736 R0 SYMATTR InstName R9 SYMATTR Value 1000 SYMBOL voltage -320 736 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V2 SYMATTR Value PWL(0 0 18m 0 21m 3 25m 3 25.05m 0) SYMBOL res 1632 256 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R20 SYMATTR Value 200 SYMBOL pmos 1616 432 M270 SYMATTR InstName M2 SYMATTR Value Si4401DY SYMBOL nmos 1376 704 R0 SYMATTR InstName M3 SYMATTR Value BSS123 SYMBOL voltage 1264 784 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V6 SYMATTR Value PWL(0 0 20m 0 21m 3 25m 3 25.5m 0) SYMBOL ind 3072 -272 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 5 56 VBottom 0 SYMATTR InstName L4 SYMATTR Value 47µ SYMBOL cap 3232 -272 R0 SYMATTR InstName C10 SYMATTR Value 10µ SYMBOL res 3312 -288 R0 SYMATTR InstName Rload1 SYMATTR Value 200 SYMBOL PowerProducts\\LTC3631-3.3 2960 -144 R0 SYMATTR InstName U2 SYMBOL cap 2800 96 R0 SYMATTR InstName C11 SYMATTR Value 100n SYMBOL cap 2752 -192 R0 SYMATTR InstName C12 SYMATTR Value 1µ SYMBOL res 1664 304 R0 SYMATTR InstName R14 SYMATTR Value 100000 SYMBOL cap 608 -48 R0 SYMATTR InstName C6 SYMATTR Value 22µ SYMBOL cap 128 576 R0 SYMATTR InstName C7 SYMATTR Value 10p SYMBOL npn 256 640 R0 SYMATTR InstName Q3 SYMATTR Value 2N3904 SYMBOL res 128 672 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R10 SYMATTR Value 1000 SYMBOL res 1488 432 R0 SYMATTR InstName R11 SYMATTR Value 10000 SYMBOL res 3184 288 R0 SYMATTR InstName R12 SYMATTR Value 3 SYMBOL nmos 3152 432 R0 SYMATTR InstName M1 SYMATTR Value FDR4420A SYMBOL voltage 2960 592 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V3 SYMATTR Value PWL(0 0 22m 0 23m 3v) SYMBOL cap 1984 384 R0 SYMATTR InstName C8 SYMATTR Value 54p SYMBOL cap 2400 384 R0 SYMATTR InstName C9 SYMATTR Value 54p SYMBOL ind 2064 288 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 5 56 VBottom 0 SYMATTR InstName L2 SYMATTR Value 6.4µ SYMBOL ind 2256 560 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 5 56 VBottom 0 SYMATTR InstName L3 SYMATTR Value 6.4µ SYMBOL res 2336 256 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R13 SYMATTR Value 0.0463 SYMBOL res 2192 528 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R15 SYMATTR Value 0.0463 TEXT 576 672 Left 0 !.tran 0 30ms 20us 1us startup TEXT 1600 648 Left 0 ;Max inductance for 50ma is 4mH. \nMax inductance for 20ma is 30mH.\nMax Capacitance for 17V is 0.05uF 50nf\nMax Capacitance for 12V is ~130nf\nMax Capacitance for 10V is ~220nf TEXT 968 824 Left 0 ;Low for startup current\nHigh for main current TEXT 296 832 Left 0 ;High for Startup Voltage 10V\nLow for main power at 20V TEXT 608 496 Left 0 ;1.231 V TEXT -432 456 Left 0 ;Equivilant of pin connected to ground pulling on Q3 base\nEnable real power when pin made at 18ms in example\nDisable when pin yanked open at 31ms in example\ncurrent drops to 0.5a in 1.4ms = 2.4uJ TEXT 1992 88 Left 0 ;2 meter cable 16 AWG\n3.2uH/meter wire +pin inductance\n18pF/foot = 108pf for cable\n13.17ohm/km = 0.0263 ohm/wire \n + 20mohm max for connectors pins = 46.3mohm/wire