Version 4
SHEET 1 940 680
WIRE 160 144 -80 144
WIRE 304 144 160 144
WIRE 448 144 400 144
WIRE 496 144 448 144
WIRE 560 144 496 144
WIRE 656 144 640 144
WIRE 752 144 656 144
WIRE 848 144 752 144
WIRE -80 160 -80 144
WIRE 496 160 496 144
WIRE 752 160 752 144
WIRE 848 160 848 144
WIRE 160 176 160 144
WIRE 32 224 16 224
WIRE 320 224 320 192
WIRE 320 224 288 224
WIRE 496 240 496 224
WIRE -80 256 -80 240
WIRE 656 256 656 144
WIRE 752 256 752 224
WIRE 848 256 848 240
WIRE 448 304 448 144
WIRE 448 304 288 304
WIRE -144 384 -160 384
WIRE -64 384 -80 384
WIRE 32 384 16 384
WIRE 656 384 656 336
WIRE 656 384 288 384
WIRE 656 400 656 384
WIRE 160 448 160 432
WIRE 656 496 656 480
FLAG 160 448 0
FLAG -160 384 0
FLAG -80 256 0
FLAG 496 240 0
FLAG 752 256 0
FLAG 656 496 0
FLAG 848 256 0
FLAG -80 144 IN
FLAG 848 144 OUT
SYMBOL voltage -80 144 R0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL pmos 400 192 M270
WINDOW 0 72 55 VLeft 2
WINDOW 3 -15 71 VLeft 2
SYMATTR InstName Q1
SYMATTR Value FDC638P
SYMBOL res 32 368 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 20K
SYMBOL cap -80 368 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 680p
SYMBOL schottky 480 224 M180
WINDOW 0 40 46 Left 2
WINDOW 3 33 2 Left 2
SYMATTR InstName D1
SYMATTR Value 1N5817
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL ind 544 160 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value 3.3µ
SYMBOL cap 736 160 R0
WINDOW 3 28 51 Left 2
SYMATTR Value 47µ
SYMATTR InstName C2
SYMBOL res 640 240 R0
SYMATTR InstName R2
SYMATTR Value 174K
SYMBOL res 640 496 M180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R3
SYMATTR Value 82.5K
SYMBOL res 832 256 M180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName Rload
SYMATTR Value 2.5
SYMBOL PowerProducts\\LTC3772B 160 304 R0
SYMATTR InstName U1
TEXT 368 448 Left 2 !.tran 1.5m startup