Version 4
SHEET 1 1800 680
WIRE -128 -352 -256 -352
WIRE -48 -352 -128 -352
WIRE 128 -352 128 -384
WIRE 480 -352 432 -352
WIRE 592 -352 480 -352
WIRE 688 -352 592 -352
WIRE 800 -352 688 -352
WIRE -256 -336 -256 -352
WIRE -128 -336 -128 -352
WIRE 480 -336 480 -352
WIRE 688 -336 688 -352
WIRE 800 -336 800 -352
WIRE 960 -320 848 -320
WIRE -48 -304 -48 -352
WIRE -16 -304 -48 -304
WIRE 432 -304 432 -352
WIRE 432 -304 272 -304
WIRE 592 -304 592 -352
WIRE 960 -304 960 -320
WIRE -256 -240 -256 -256
WIRE -128 -240 -128 -256
WIRE -16 -240 -128 -240
WIRE 480 -240 480 -256
WIRE 480 -240 272 -240
WIRE 688 -240 688 -272
WIRE 800 -240 800 -256
WIRE 480 -224 480 -240
WIRE 960 -208 960 -224
WIRE -16 -176 -32 -176
WIRE 432 -176 272 -176
WIRE 480 -128 480 -144
WIRE -128 -112 -128 -240
WIRE -16 -112 -128 -112
WIRE 288 -112 272 -112
WIRE 384 -112 368 -112
WIRE 432 -96 432 -176
WIRE 592 -96 592 -224
WIRE 592 -96 432 -96
WIRE -16 -48 -48 -48
WIRE 320 -48 272 -48
WIRE -48 16 -48 -48
WIRE -16 16 -48 16
WIRE 320 16 320 -48
WIRE 320 16 272 16
WIRE 320 80 272 80
WIRE 320 112 320 80
WIRE 336 208 272 208
FLAG 480 -128 0
FLAG 320 112 0
FLAG 384 -112 0
FLAG -256 -240 0
FLAG 688 -240 0
FLAG 800 -352 OUT
FLAG -256 -352 IN
FLAG 336 208 TjFET
FLAG 800 -240 0
FLAG 848 -272 0
FLAG 960 -208 0
FLAG -32 -176 0
SYMBOL voltage -256 -352 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL cap 672 -336 R0
SYMATTR InstName C2
SYMATTR Value 680µ
SYMBOL res 272 -96 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 20K
SYMBOL res -144 -240 M180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R2
SYMATTR Value 20K
SYMBOL res 464 -240 R0
SYMATTR InstName R3
SYMATTR Value 20K
SYMBOL res 464 -352 R0
SYMATTR InstName R4
SYMATTR Value 150K
SYMBOL res 576 -320 R0
SYMATTR InstName R5
SYMATTR Value 20K
SYMBOL cap 304 16 R0
WINDOW 0 28 11 Left 2
SYMATTR InstName C1
SYMATTR Value 1µ
SYMBOL sw 800 -240 R180
WINDOW 0 -23 102 Right 2
WINDOW 3 -26 2 Right 2
SYMATTR InstName S1
SYMATTR Value SHORT
SYMBOL voltage 960 -320 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value PULSE(0 1 240m 1m 1m 10m)
SYMBOL LTC4233 128 -144 R0
SYMATTR InstName U1
TEXT 464 0 Left 2 !.model SHORT SW(Ron=10m Roff=1K Vt=.5 Vh=-.4)
TEXT 536 208 Left 2 !.tran 1.4 startup