Version 4
SHEET 1 1680 680
WIRE 480 -176 336 -176
WIRE 480 -160 480 -176
WIRE 608 -128 528 -128
WIRE 672 -128 608 -128
WIRE 784 -128 752 -128
WIRE 832 -128 784 -128
WIRE 928 -128 832 -128
WIRE 528 -112 528 -128
WIRE 608 -112 608 -128
WIRE 832 -112 832 -128
WIRE 928 -112 928 -128
WIRE -800 -64 -896 -64
WIRE -736 -64 -800 -64
WIRE -464 -64 -736 -64
WIRE 16 -64 -464 -64
WIRE 480 -64 480 -80
WIRE 480 -64 16 -64
WIRE -896 -48 -896 -64
WIRE -464 -48 -464 -64
WIRE 16 -48 16 -64
WIRE 480 -48 480 -64
WIRE 528 -16 528 -32
WIRE 608 -16 528 -16
WIRE 672 -16 608 -16
WIRE 784 -16 784 -128
WIRE 784 -16 752 -16
WIRE 832 -16 832 -48
WIRE 928 -16 928 -32
WIRE 608 0 608 -16
WIRE 336 32 336 -176
WIRE -896 48 -896 32
WIRE -736 48 -736 -64
WIRE -720 48 -736 48
WIRE -528 48 -624 48
WIRE 16 48 16 32
WIRE 16 48 -528 48
WIRE -528 64 -528 48
WIRE 16 64 16 48
WIRE 480 96 480 32
WIRE -464 112 -464 32
WIRE -368 112 -464 112
WIRE -160 112 -368 112
WIRE 288 112 176 112
WIRE -800 128 -800 -64
WIRE -784 128 -800 128
WIRE -672 128 -672 112
WIRE -672 128 -704 128
WIRE -464 128 -464 112
WIRE -368 128 -368 112
WIRE -672 144 -672 128
WIRE -528 144 -528 128
WIRE -256 176 -288 176
WIRE -160 176 -176 176
WIRE 432 176 176 176
WIRE -672 224 -672 208
WIRE -464 224 -464 208
WIRE -368 224 -368 192
WIRE -288 240 -288 176
WIRE -160 240 -288 240
WIRE 240 240 176 240
WIRE 336 240 336 128
WIRE 336 240 320 240
WIRE 480 240 480 192
WIRE 480 240 336 240
WIRE 496 240 480 240
WIRE 592 240 576 240
WIRE 784 272 784 -16
WIRE -256 304 -272 304
WIRE -160 304 -176 304
WIRE 192 304 176 304
WIRE 288 304 272 304
WIRE -160 368 -224 368
WIRE 288 368 176 368
WIRE 784 368 784 352
WIRE 784 368 288 368
WIRE -224 384 -224 368
WIRE 784 384 784 368
WIRE -80 432 -80 416
WIRE 16 432 16 416
WIRE 112 432 112 416
WIRE -224 464 -224 448
WIRE 784 480 784 464
FLAG 592 240 0
FLAG -80 496 0
FLAG 16 432 0
FLAG 112 432 0
FLAG -272 304 0
FLAG -224 464 0
FLAG -896 48 0
FLAG 608 64 0
FLAG 608 -48 0
FLAG 784 480 0
FLAG 928 -16 0
FLAG 832 -16 0
FLAG 928 -128 OUT
FLAG -896 -64 IN
FLAG -528 144 0
FLAG -464 224 0
FLAG -368 224 0
FLAG -672 224 0
SYMBOL LTC3721-1 16 240 R0
SYMATTR InstName U1
SYMBOL nmos 288 32 R0
WINDOW 0 52 26 Left 2
WINDOW 3 51 55 Left 2
SYMATTR InstName Q1
SYMATTR Value IRF7201
SYMBOL nmos 432 96 R0
WINDOW 3 55 65 Left 2
SYMATTR Value IRF7201
SYMATTR InstName Q2
SYMBOL res 480 256 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 75m
SYMBOL res 336 224 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 100
SYMBOL cap -96 432 R0
WINDOW 3 30 52 Left 2
SYMATTR Value 270p
SYMATTR InstName C1
SYMBOL res -160 160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 100K
SYMBOL res -160 288 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 100K
SYMBOL cap -240 384 R0
WINDOW 3 30 52 Left 2
SYMATTR Value .1µ
SYMATTR InstName C2
SYMBOL voltage -896 -64 R0
WINDOW 3 26 92 Left 2
SYMATTR Value 12
SYMATTR InstName V1
SYMBOL ind2 464 -176 R0
WINDOW 0 -5 37 Right 2
WINDOW 3 -4 74 Right 2
SYMATTR InstName L1
SYMATTR Value .5m
SYMATTR Type ind
SYMBOL ind2 464 -64 R0
WINDOW 0 -2 36 Right 2
WINDOW 3 -7 75 Right 2
SYMATTR InstName L2
SYMATTR Value .5m
SYMATTR Type ind
SYMBOL ind2 544 -128 M0
WINDOW 0 -4 38 Right 2
WINDOW 3 -4 71 Right 2
SYMATTR InstName L3
SYMATTR Value .5m
SYMATTR Type ind
SYMBOL ind 656 -112 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L4
SYMATTR Value 20µ
SYMBOL ind 656 0 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L5
SYMATTR Value 20µ
SYMBOL schottky 592 -48 M180
WINDOW 0 34 61 Left 2
WINDOW 3 35 16 Left 2
SYMATTR InstName D1
SYMATTR Value 1N5817
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL schottky 592 64 M180
WINDOW 0 34 53 Left 2
WINDOW 3 38 13 Left 2
SYMATTR InstName D2
SYMATTR Value 1N5817
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 768 256 R0
SYMATTR InstName R5
SYMATTR Value 15.8K
SYMBOL res 768 368 R0
SYMATTR InstName R6
SYMATTR Value 5K
SYMBOL cap 272 368 M180
WINDOW 0 24 64 Left 2
WINDOW 3 27 14 Left 2
SYMATTR InstName C3
SYMATTR Value .001µ
SYMBOL res 288 288 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 50K
SYMBOL cap 816 -112 R0
SYMATTR InstName C4
SYMATTR Value 100µ
SYMBOL npn -720 112 R270
WINDOW 0 55 37 VRight 2
WINDOW 3 0 64 VRight 2
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL res 0 -64 R0
SYMATTR InstName R8
SYMATTR Value 2K
SYMBOL res -800 144 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R9
SYMATTR Value 2K
SYMBOL cap -544 128 M180
WINDOW 0 24 56 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C5
SYMATTR Value 1µ
SYMBOL zener -688 208 M180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D3
SYMATTR Value MMBZ9V1AL
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 912 -128 R0
SYMATTR InstName Rload
SYMATTR Value 10
SYMBOL res -480 -64 R0
SYMATTR InstName R10
SYMATTR Value 107K
SYMBOL res -480 112 R0
SYMATTR InstName R11
SYMATTR Value 100K
SYMBOL cap -384 128 R0
SYMATTR InstName C6
SYMATTR Value .001µ
TEXT 512 -176 Bottom 2 !K1 L1 L2 L3 1
TEXT 464 424 Left 2 !.tran 8m startup