Version 4
SHEET 1 1680 680
WIRE 480 -128 336 -128
WIRE 480 -112 480 -128
WIRE 608 -80 528 -80
WIRE 672 -80 608 -80
WIRE 784 -80 752 -80
WIRE 832 -80 784 -80
WIRE 928 -80 832 -80
WIRE 528 -64 528 -80
WIRE 608 -64 608 -80
WIRE 832 -64 832 -80
WIRE 928 -64 928 -80
WIRE -208 -16 -336 -16
WIRE 16 -16 -208 -16
WIRE 480 -16 480 -32
WIRE 480 -16 16 -16
WIRE -336 0 -336 -16
WIRE 480 0 480 -16
WIRE 336 32 336 -128
WIRE 528 32 528 16
WIRE 608 32 528 32
WIRE 672 32 608 32
WIRE 784 32 784 -80
WIRE 784 32 752 32
WIRE 832 32 832 0
WIRE 928 32 928 16
WIRE 608 48 608 32
WIRE 16 64 16 -16
WIRE -336 96 -336 80
WIRE 480 96 480 80
WIRE -208 112 -208 -16
WIRE -160 112 -208 112
WIRE 288 112 176 112
WIRE 784 144 784 32
WIRE -256 176 -288 176
WIRE -160 176 -176 176
WIRE 432 176 176 176
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 -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 784 368 784 224
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 -336 96 0
FLAG 608 112 0
FLAG 608 0 0
FLAG 784 480 0
FLAG 928 32 0
FLAG 832 32 0
FLAG 928 -80 OUT
FLAG -336 -16 IN
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 -336 -16 R0
WINDOW 3 26 92 Left 2
SYMATTR Value 12
SYMATTR InstName V1
SYMBOL ind2 464 -128 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 -16 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 -80 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 -64 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L4
SYMATTR Value 20µ
SYMBOL ind 656 48 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L5
SYMATTR Value 20µ
SYMBOL schottky 592 0 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 592 112 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 768 128 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 -64 R0
SYMATTR InstName C4
SYMATTR Value 100µ
SYMBOL res 912 -80 R0
SYMATTR InstName Rload
SYMATTR Value 10
TEXT 504 -112 Left 2 !K1 L1 L2 L3 1
TEXT 464 424 Left 2 !.tran 6.5m startup