Version 4
SHEET 1 1224 1140
WIRE 352 112 -112 112
WIRE 464 112 352 112
WIRE 464 128 464 112
WIRE -64 160 -80 160
WIRE 352 160 352 112
WIRE 352 160 288 160
WIRE 352 224 352 160
WIRE 464 224 464 208
WIRE -112 240 -112 112
WIRE -64 240 -112 240
WIRE 304 240 288 240
WIRE -112 320 -112 240
WIRE -64 320 -112 320
WIRE 352 320 288 320
WIRE 464 320 352 320
WIRE 576 320 544 320
WIRE 688 320 576 320
WIRE 784 320 688 320
WIRE 688 336 688 320
WIRE 784 336 784 320
WIRE 576 352 576 320
WIRE -64 400 -80 400
WIRE 304 400 288 400
WIRE 352 432 352 416
WIRE 688 432 688 400
WIRE 784 432 784 416
WIRE -160 480 -176 480
WIRE -64 480 -96 480
WIRE 576 480 576 432
WIRE 576 480 288 480
WIRE 576 496 576 480
WIRE 112 544 112 528
WIRE 576 592 576 576
FLAG 352 432 0
FLAG 688 432 0
FLAG 112 544 0
FLAG 464 224 0
FLAG 784 432 0
FLAG 576 592 0
FLAG -80 160 0
FLAG -176 480 0
FLAG 784 320 OUT
FLAG 464 112 IN
SYMBOL nmos 304 320 R0
SYMATTR InstName Q1
SYMATTR Value FDS6680A
SYMBOL pmos 304 320 M180
WINDOW 0 58 64 Left 2
WINDOW 3 53 25 Left 2
SYMATTR InstName Q2
SYMATTR Value FDC638P
SYMBOL cap 672 336 R0
SYMATTR SpiceLine Rser=50m
SYMATTR Value 47µ
SYMATTR InstName C1
SYMBOL cap -160 464 M90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
WINDOW 39 60 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 220p
SYMATTR SpiceLine Rser=15K
SYMBOL voltage 464 112 R0
WINDOW 3 32 94 Left 2
SYMATTR Value 5
SYMATTR InstName V1
SYMBOL ind 448 336 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value 2.2µ
SYMATTR SpiceLine Rpar=1K
SYMBOL res 560 336 R0
SYMATTR InstName R1
SYMATTR Value 187K
SYMBOL res 560 480 R0
SYMATTR InstName R2
SYMATTR Value 59K
SYMBOL PowerProducts\\LTC3809-1 112 320 R0
SYMATTR InstName U1
SYMBOL res 768 320 R0
SYMATTR InstName Rload
SYMATTR Value 50
TEXT 688 496 Left 2 !.tran 2m startup