Version 4
SHEET 1 912 852
WIRE -320 -80 -544 -80
WIRE -16 -80 -320 -80
WIRE 16 -80 -16 -80
WIRE 208 -80 112 -80
WIRE 224 -80 208 -80
WIRE 320 -80 304 -80
WIRE 384 -80 368 -80
WIRE 480 -80 464 -80
WIRE -544 -64 -544 -80
WIRE -320 -32 -320 -80
WIRE 96 -16 96 -32
WIRE 176 -16 160 -16
WIRE -544 32 -544 16
WIRE -16 32 -16 -80
WIRE 96 32 96 -16
WIRE 208 32 208 -80
WIRE 464 48 448 48
WIRE 560 48 544 48
WIRE 576 48 560 48
WIRE 672 48 656 48
WIRE 672 80 672 48
WIRE -320 96 -320 48
WIRE -64 96 -320 96
WIRE 560 96 560 48
WIRE 560 96 256 96
WIRE 624 96 560 96
WIRE -320 112 -320 96
WIRE 624 144 592 144
WIRE 592 160 592 144
WIRE 672 176 672 160
WIRE -320 208 -320 192
WIRE -160 208 -272 208
WIRE -64 208 -160 208
WIRE 272 208 256 208
WIRE 368 208 368 -80
WIRE 368 208 352 208
WIRE -272 224 -272 208
WIRE 592 256 592 240
WIRE -272 320 -272 304
WIRE -64 320 -272 320
WIRE 272 320 256 320
WIRE 368 320 368 208
WIRE 368 320 352 320
WIRE -272 336 -272 320
WIRE -160 336 -160 208
WIRE 368 384 352 384
WIRE 464 384 448 384
WIRE 480 384 464 384
WIRE 576 384 560 384
WIRE 576 416 576 384
WIRE -272 432 -272 416
WIRE -160 432 -160 416
WIRE -64 432 -160 432
WIRE 464 432 464 384
WIRE 464 432 256 432
WIRE 528 432 464 432
WIRE -160 448 -160 432
WIRE 528 480 496 480
WIRE 96 496 96 480
WIRE 496 496 496 480
WIRE 576 512 576 496
WIRE -160 544 -160 528
WIRE 496 592 496 576
FLAG 480 -80 0
FLAG -160 544 0
FLAG 96 496 0
FLAG -272 432 0
FLAG -320 208 0
FLAG 320 -80 0
FLAG -544 32 0
FLAG 176 -16 0
FLAG 352 384 0
FLAG 496 592 0
FLAG 576 512 0
FLAG 448 48 0
FLAG 592 256 0
FLAG 672 176 0
SYMBOL res 368 192 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 100K
SYMBOL res 368 304 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 100K
SYMBOL voltage 368 -80 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 -32 56 VBottom 2
SYMATTR InstName V1
SYMATTR Value 3.3
SYMBOL res -176 320 R0
SYMATTR InstName R3
SYMATTR Value 887K
SYMBOL res -176 432 R0
SYMATTR InstName R4
SYMATTR Value 412K
SYMBOL res -288 208 R0
SYMATTR InstName R5
SYMATTR Value 16.5K
SYMBOL res -288 320 R0
SYMATTR InstName R6
SYMATTR Value 13K
SYMBOL res -336 -48 R0
SYMATTR InstName R7
SYMATTR Value 1
SYMBOL res -336 96 R0
SYMATTR InstName R8
SYMATTR Value 100K
SYMBOL nmos 16 -32 R270
WINDOW 0 100 30 VRight 2
WINDOW 3 72 -3 VRight 2
SYMATTR InstName Q1
SYMATTR Value Si4420DY
SYMBOL voltage -544 -80 R0
SYMATTR InstName V2
SYMATTR Value PWL(0 0 1 3.3)
SYMBOL res 208 -64 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R9
SYMATTR Value 100
SYMBOL cap 160 -32 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 1µ
SYMBOL PowerProducts\\LTC2923 96 256 R0
SYMATTR InstName U1
SYMBOL res 464 368 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R10
SYMATTR Value 400K
SYMBOL res 576 368 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R11
SYMATTR Value 400K
SYMBOL g2 576 400 R0
SYMATTR InstName G1
SYMATTR Value 1
SYMBOL voltage 496 480 R0
SYMATTR InstName V3
SYMATTR Value 1
SYMBOL res 560 32 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R12
SYMATTR Value 15K
SYMBOL res 672 32 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R13
SYMATTR Value 15K
SYMBOL g2 672 64 R0
SYMATTR InstName G2
SYMATTR Value 1
SYMBOL voltage 592 144 R0
SYMATTR InstName V4
SYMATTR Value 1
TEXT 256 560 Left 2 !.tran 1 2 0 1m