Version 4
SHEET 1 1508 1060
WIRE 832 -656 -112 -656
WIRE 1056 -656 832 -656
WIRE 1056 -640 1056 -656
WIRE 400 -608 336 -608
WIRE 560 -608 464 -608
WIRE 336 -560 336 -608
WIRE 704 -560 336 -560
WIRE 704 -544 704 -560
WIRE 832 -544 832 -656
WIRE 1056 -544 1056 -560
WIRE 336 -528 336 -560
WIRE -112 -464 -112 -656
WIRE -48 -464 -112 -464
WIRE 784 -464 464 -464
WIRE -112 -368 -112 -464
WIRE -48 -368 -112 -368
WIRE 704 -368 704 -480
WIRE 704 -368 464 -368
WIRE 832 -368 832 -448
WIRE 832 -368 704 -368
WIRE 1056 -368 832 -368
WIRE 560 -272 560 -608
WIRE 560 -272 464 -272
WIRE 704 -272 560 -272
WIRE 704 -256 704 -272
WIRE 832 -256 832 -368
WIRE -144 -176 -176 -176
WIRE -48 -176 -80 -176
WIRE 784 -176 464 -176
WIRE 560 -160 560 -272
WIRE 704 -80 704 -192
WIRE 704 -80 464 -80
WIRE 832 -80 832 -160
WIRE 832 -80 704 -80
WIRE 912 -80 832 -80
WIRE 1056 -80 1056 -368
WIRE 912 -64 912 -80
WIRE -160 16 -176 16
WIRE -48 16 -80 16
WIRE 704 16 464 16
WIRE 736 16 704 16
WIRE 832 16 832 -80
WIRE 832 16 816 16
WIRE 912 16 912 0
WIRE -160 112 -176 112
WIRE -48 112 -80 112
WIRE 560 112 560 -96
WIRE 560 112 464 112
WIRE 704 112 560 112
WIRE 832 128 832 16
WIRE -160 208 -192 208
WIRE -48 208 -80 208
WIRE 784 208 464 208
WIRE 704 224 704 112
WIRE -192 304 -192 208
WIRE -160 304 -192 304
WIRE -48 304 -80 304
WIRE 704 304 704 288
WIRE 704 304 464 304
WIRE 832 304 832 224
WIRE 832 304 704 304
WIRE 1056 304 1056 -16
WIRE 1056 304 832 304
WIRE 1120 304 1056 304
WIRE 1264 304 1200 304
WIRE 1296 304 1264 304
WIRE 1344 304 1296 304
WIRE 1456 304 1344 304
WIRE 832 320 832 304
WIRE 1344 320 1344 304
WIRE 1456 320 1456 304
WIRE 1056 352 1056 304
WIRE -192 400 -192 304
WIRE -112 400 -192 400
WIRE -48 400 -112 400
WIRE 784 400 464 400
WIRE -192 416 -192 400
WIRE 560 416 560 112
WIRE 1344 416 1344 384
WIRE 1456 416 1456 400
WIRE 832 432 832 416
WIRE -192 496 -192 480
WIRE -112 496 -112 400
WIRE -48 496 -112 496
WIRE 1056 496 1056 432
WIRE 1056 496 464 496
WIRE 1120 496 1056 496
WIRE 1264 496 1264 304
WIRE 1264 496 1184 496
WIRE 1296 560 1296 304
WIRE 1264 592 1264 496
WIRE 1264 592 464 592
WIRE -48 688 -64 688
WIRE 1296 688 1296 640
WIRE 1296 688 464 688
WIRE 1296 720 1296 688
WIRE 80 768 80 752
WIRE 208 768 208 752
WIRE 336 768 336 752
WIRE 1296 816 1296 800
WIRE 80 848 80 832
WIRE 208 848 208 832
WIRE -112 896 -112 496
WIRE 560 896 560 480
WIRE 560 896 -112 896
FLAG 1056 -544 0
FLAG -176 -176 0
FLAG -176 16 0
FLAG -176 112 0
FLAG -192 496 0
FLAG -64 688 0
FLAG 336 768 0
FLAG 80 848 0
FLAG 208 848 0
FLAG 832 432 0
FLAG 704 80 0
FLAG 1344 416 0
FLAG 1456 416 0
FLAG 1456 304 OUT
FLAG 1056 -656 IN
FLAG 1296 816 0
FLAG 912 16 0
SYMBOL PowerProducts\\LTC7821 208 112 R0
SYMATTR InstName U1
SYMBOL voltage 1056 -656 R0
SYMATTR InstName V1
SYMATTR Value 48
SYMBOL cap -80 -192 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value .47µ
SYMBOL res -64 0 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 100K
SYMBOL res -64 96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 68K
SYMBOL res -64 192 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 10K
SYMBOL res -64 288 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 10K
SYMBOL cap -208 416 R0
SYMATTR InstName C2
SYMATTR Value 4.7µ
SYMBOL cap 64 768 R0
WINDOW 0 22 2 Left 2
WINDOW 3 37 35 Left 2
WINDOW 123 21 64 Left 2
WINDOW 39 16 69 Left 2
SYMATTR InstName C3
SYMATTR Value 1n
SYMATTR Value2 Rser=4.7K
SYMBOL cap 192 768 R0
SYMATTR InstName C4
SYMATTR Value 10n
SYMBOL diode 544 480 M180
WINDOW 0 30 55 Left 2
WINDOW 3 36 30 Left 2
SYMATTR InstName D1
SYMATTR Value CMDSH2-3
SYMBOL diode 544 -96 M180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
SYMATTR Value CMDSH2-3
SYMBOL diode 464 -592 M270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D3
SYMATTR Value CMDSH2-3
SYMBOL nmos 784 320 R0
SYMATTR InstName Q1
SYMATTR Value BSC014N03LS
SYMBOL nmos 784 128 R0
SYMATTR InstName Q2
SYMATTR Value BSC034N03LS
SYMBOL nmos 784 -256 R0
SYMATTR InstName Q3
SYMATTR Value BSC034N03LS
SYMBOL res 832 0 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 1
SYMBOL nmos 784 -544 R0
SYMATTR InstName Q4
SYMATTR Value BSZ065N03LS
SYMBOL cap 688 16 R0
WINDOW 0 25 13 Left 2
WINDOW 3 25 48 Left 2
SYMATTR InstName C5
SYMATTR Value .1µ
SYMBOL cap 688 224 R0
SYMATTR InstName C6
SYMATTR Value 1µ
SYMBOL cap 688 -256 R0
SYMATTR InstName C7
SYMATTR Value .47µ
SYMBOL cap 688 -544 R0
SYMATTR InstName C8
SYMATTR Value .22µ
SYMBOL ind 1104 320 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value 2µ
SYMATTR Value2 Rser=1.33m
SYMBOL cap 1328 320 R0
WINDOW 123 26 55 Left 2
WINDOW 3 35 33 Left 2
SYMATTR Value2 x2
SYMATTR InstName C9
SYMATTR Value 150µ
SYMBOL res 1440 304 R0
SYMATTR InstName R6
SYMATTR Value .6
SYMBOL res 1040 336 R0
SYMATTR InstName R7
SYMATTR Value 6.81K
SYMBOL cap 1184 480 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C10
SYMATTR Value .22µ
SYMBOL res 1280 544 R0
SYMATTR InstName R8
SYMATTR Value 140K
SYMBOL res 1280 704 R0
SYMATTR InstName R9
SYMATTR Value 10K
SYMBOL cap 896 -64 R0
WINDOW 3 43 32 Left 2
WINDOW 123 34 59 Left 2
SYMATTR Value 6µ
SYMATTR Value2 x4
SYMATTR InstName C11
SYMBOL cap 1040 -80 R0
WINDOW 3 43 32 Left 2
WINDOW 123 34 59 Left 2
SYMATTR Value 6µ
SYMATTR Value2 x8
SYMATTR InstName C12
TEXT 600 888 Left 2 !.tran 0 107m 105m startup