Version 4 SHEET 1 3508 1892 WIRE 2624 1344 2272 1344 WIRE 2880 1344 2624 1344 WIRE 2272 1360 2272 1344 WIRE 2880 1360 2880 1344 WIRE 2624 1376 2624 1344 WIRE 2272 1456 2272 1440 WIRE 2464 1456 2432 1456 WIRE 2880 1456 2880 1440 WIRE 2880 1456 2784 1456 WIRE 2880 1520 2880 1456 WIRE 2352 1536 2288 1536 WIRE 2464 1536 2432 1536 WIRE 2832 1536 2784 1536 WIRE 2288 1552 2288 1536 WIRE 2464 1616 2384 1616 WIRE 2816 1616 2784 1616 WIRE 2288 1632 2288 1616 WIRE 2384 1632 2384 1616 WIRE 2880 1632 2880 1616 WIRE 2960 1632 2880 1632 WIRE 3088 1632 3040 1632 WIRE 3200 1632 3088 1632 WIRE 3296 1632 3200 1632 WIRE 2880 1648 2880 1632 WIRE 3088 1648 3088 1632 WIRE 3200 1648 3200 1632 WIRE 3296 1648 3296 1632 WIRE 2384 1712 2384 1696 WIRE 2624 1712 2624 1696 WIRE 2880 1728 2880 1712 WIRE 3200 1744 3200 1712 WIRE 3296 1744 3296 1728 WIRE 2816 1760 2816 1616 WIRE 3088 1760 3088 1728 WIRE 3088 1760 2816 1760 WIRE 3088 1776 3088 1760 WIRE 3088 1872 3088 1856 FLAG 2624 1712 0 FLAG 2880 1728 0 FLAG 2384 1712 0 FLAG 2288 1632 0 FLAG 2272 1456 0 FLAG 3088 1872 0 FLAG 3200 1744 0 FLAG 3296 1744 0 FLAG 3296 1632 OUT FLAG 2272 1344 IN SYMBOL RES 3072 1632 R0 SYMATTR InstName R1 SYMATTR Value 159K SYMBOL PMOS 2832 1616 M180 WINDOW 0 56 96 Left 2 WINDOW 3 56 56 Left 2 SYMATTR InstName Q1 SYMATTR Value FDC638P SYMBOL ind 2944 1648 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L1 SYMATTR Value 4.7µ SYMBOL schottky 2864 1712 M180 WINDOW 0 38 55 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D1 SYMATTR Value 1N5818 SYMBOL cap 2368 1632 R0 SYMATTR InstName C1 SYMATTR Value 470p SYMBOL cap 2272 1552 R0 SYMATTR InstName C2 SYMATTR Value 220µ SYMBOL res 2448 1520 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 10K SYMBOL VOLTAGE 2272 1344 R0 SYMATTR InstName V1 SYMATTR Value 3.3 SYMBOL res 3072 1760 R0 SYMATTR InstName R3 SYMATTR Value 75K SYMBOL res 2864 1344 R0 SYMATTR InstName R4 SYMATTR Value .03 SYMBOL polcap 3184 1648 R0 SYMATTR SpiceLine Rser=.1 SYMATTR InstName C3 SYMATTR Value 47µ SYMBOL res 3280 1632 R0 SYMATTR InstName Rload SYMATTR Value 5 SYMBOL POWERPRODUCTS\\LTC1622 2624 1536 R0 SYMATTR InstName U1 TEXT 2688 1816 Left 2 !.tran 2m startup