Version 4 SHEET 1 1836 1508 WIRE -3952 -32 -4064 -32 WIRE -3712 -32 -3952 -32 WIRE -3568 -32 -3712 -32 WIRE -3472 -32 -3568 -32 WIRE -3392 -32 -3472 -32 WIRE -3280 -32 -3392 -32 WIRE -4064 -16 -4064 -32 WIRE -3952 -16 -3952 -32 WIRE -3392 -16 -3392 -32 WIRE -3280 -16 -3280 -32 WIRE -3712 0 -3712 -32 WIRE -3568 48 -3568 -32 WIRE -3392 80 -3392 48 WIRE -3280 80 -3280 64 WIRE -4160 96 -4176 96 WIRE -4064 96 -4064 64 WIRE -4064 96 -4096 96 WIRE -3952 96 -3952 64 WIRE -3920 96 -3952 96 WIRE -3808 96 -3840 96 WIRE -3712 128 -3712 80 WIRE -3712 128 -3840 128 WIRE -3616 128 -3712 128 WIRE -3568 160 -3568 144 WIRE -3568 160 -4416 160 WIRE -4064 176 -4064 96 WIRE -3952 176 -3952 96 WIRE -3840 176 -3840 128 WIRE -4416 240 -4416 160 WIRE -4176 240 -4416 240 WIRE -3696 240 -3728 240 WIRE -3664 240 -3696 240 WIRE -3568 240 -3568 160 WIRE -3568 240 -3600 240 WIRE -3472 256 -3472 -32 WIRE -4416 336 -4416 240 WIRE -4176 336 -4416 336 WIRE -3520 336 -3728 336 WIRE -3696 352 -3696 240 WIRE -4416 432 -4416 336 WIRE -4400 432 -4416 432 WIRE -4288 432 -4320 432 WIRE -4176 432 -4288 432 WIRE -3696 432 -3696 416 WIRE -3696 432 -3728 432 WIRE -3472 432 -3472 352 WIRE -3472 432 -3696 432 WIRE -3424 432 -3472 432 WIRE -3376 432 -3424 432 WIRE -3248 432 -3296 432 WIRE -3184 432 -3248 432 WIRE -3040 432 -3184 432 WIRE -3184 448 -3184 432 WIRE -3040 448 -3040 432 WIRE -4288 464 -4288 432 WIRE -3424 464 -3424 432 WIRE -4176 528 -4192 528 WIRE -3696 528 -3728 528 WIRE -3568 528 -3568 240 WIRE -3568 528 -3696 528 WIRE -3568 544 -3568 528 WIRE -3424 544 -3424 528 WIRE -3184 544 -3184 512 WIRE -3040 544 -3040 528 WIRE -4288 560 -4288 544 WIRE -4416 624 -4416 432 WIRE -4176 624 -4416 624 WIRE -3696 624 -3696 528 WIRE -3696 624 -3728 624 WIRE -3568 624 -3568 608 WIRE -4304 720 -4368 720 WIRE -4176 720 -4240 720 WIRE -2944 720 -3728 720 WIRE -3248 768 -3248 432 WIRE -4352 816 -4368 816 WIRE -4256 816 -4272 816 WIRE -4176 816 -4192 816 WIRE -3472 816 -3472 432 WIRE -3472 816 -3728 816 WIRE -3472 832 -3472 816 WIRE -3120 848 -3184 848 WIRE -3248 880 -3248 848 WIRE -3248 880 -3344 880 WIRE -3120 880 -3120 848 WIRE -3248 896 -3248 880 WIRE -4256 912 -4368 912 WIRE -4176 912 -4256 912 WIRE -3520 912 -3728 912 WIRE -4368 928 -4368 912 WIRE -4256 928 -4256 912 WIRE -3120 992 -3120 960 WIRE -4256 1008 -4256 992 WIRE -4176 1008 -4256 1008 WIRE -3472 1008 -3472 928 WIRE -3472 1008 -3728 1008 WIRE -3248 1008 -3248 976 WIRE -3184 1008 -3184 848 WIRE -3184 1008 -3248 1008 WIRE -2944 1008 -2944 720 WIRE -4368 1024 -4368 992 WIRE -3472 1024 -3472 1008 WIRE -4064 1088 -4064 1072 WIRE -3840 1088 -3840 1072 WIRE -4368 1120 -4368 1104 WIRE -4256 1120 -4256 1008 WIRE -4256 1120 -4368 1120 WIRE -3344 1120 -3344 880 WIRE -3344 1120 -4256 1120 WIRE -2944 1120 -2944 1088 FLAG -3472 1024 0 FLAG -3568 624 0 FLAG -3424 544 0 FLAG -3840 1088 0 FLAG -4064 1088 0 FLAG -3184 544 0 FLAG -3040 544 0 FLAG -4368 720 0 FLAG -3280 80 0 FLAG -3040 432 OUT FLAG -3280 -32 IN FLAG -4192 528 0 FLAG -4368 816 0 FLAG -3392 80 0 FLAG -4176 96 0 FLAG -4288 560 0 FLAG -3808 96 0 FLAG -2944 1120 0 FLAG -3120 992 0 SYMBOL res -4080 -32 R0 SYMATTR InstName R1 SYMATTR Value 261K SYMBOL nmos -3616 48 R0 SYMATTR InstName Q1 SYMATTR Value BSH114 SYMBOL res -3728 -16 R0 SYMATTR InstName R2 SYMATTR Value 80.6K SYMBOL schottky -3600 224 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName D1 SYMATTR Value MBRS1100 SYMATTR Description Diode SYMATTR Type diode SYMBOL cap -3712 352 R0 SYMATTR InstName C1 SYMATTR Value .1µ SYMBOL nmos -3520 256 R0 SYMATTR InstName Q2 SYMATTR Value Si7810DN SYMBOL nmos -3520 832 R0 SYMATTR InstName Q3 SYMATTR Value Si7810DN SYMBOL cap -3584 544 R0 SYMATTR InstName C2 SYMATTR Value 1µ SYMBOL ind -3392 448 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L1 SYMATTR Value 15µ SYMATTR SpiceLine Ipk=14 Rser=0.0093 Rpar=0 Cpar=0 mfg="Wurth Elektronik" pn="74435571500 WE-HCB 1890" SYMBOL schottky -3440 528 M180 WINDOW 0 24 72 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D2 SYMATTR Value MBRS1100 SYMATTR Description Diode SYMATTR Type diode SYMBOL res -3264 752 R0 SYMATTR InstName R3 SYMATTR Value 74K SYMBOL res -3264 880 R0 SYMATTR InstName R4 SYMATTR Value 1K SYMBOL cap -3200 448 R0 WINDOW 39 29 72 Left 2 WINDOW 3 45 38 Left 2 SYMATTR SpiceLine Rser=10m SYMATTR Value 270µ SYMATTR InstName C3 SYMBOL cap -4272 928 R0 WINDOW 39 24 92 Left 2 WINDOW 40 23 114 Left 2 SYMATTR InstName C4 SYMATTR Value 5p SYMBOL cap -4240 704 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C5 SYMATTR Value 100p SYMBOL cap -4192 800 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 WINDOW 39 58 32 VTop 2 SYMATTR InstName C6 SYMATTR Value .01µ SYMBOL PowerProducts\\LTC3810 -3952 624 R0 SYMATTR InstName U1 SYMBOL res -4384 1008 R0 SYMATTR InstName R5 SYMATTR Value 20K SYMBOL cap -4384 928 R0 SYMATTR InstName C7 SYMATTR Value 47p SYMBOL res -4256 800 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 10K SYMBOL voltage -3280 -32 R0 WINDOW 40 24 132 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 24 139 Left 2 SYMATTR InstName V1 SYMATTR Value 80 SYMBOL cap -3408 -16 R0 SYMATTR InstName C8 SYMATTR Value 68µ SYMBOL cap -4096 80 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C9 SYMATTR Value 100p SYMBOL res -4416 448 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R7 SYMATTR Value 80.6K SYMBOL res -4304 448 R0 SYMATTR InstName R8 SYMATTR Value 20K SYMBOL res -3968 -32 R0 SYMATTR InstName R9 SYMATTR Value 470K SYMBOL res -3936 112 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R10 SYMATTR Value 12K SYMBOL res -3056 432 R0 SYMATTR InstName RLoad SYMATTR Value 600 SYMBOL voltage -2944 992 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value 15 SYMBOL voltage -3120 864 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V3 SYMATTR Value 0.0 TEXT -3256 1104 Left 2 !.tran 1000m startup TEXT -4640 1352 Left 2 ;Note:\n If the simulation model is not found please update with the "Sync Release" command from the "Tools" menu.\n It remains the customer's responsibility to verify proper and reliable operation in the actual application.\n Component substitution and printed circuit board layout may significantly affect circuit performance or reliability\n Contact your local sales representative for assistance. This circuit is distributed to customers only for use with LTC parts\n Copyright © 2011 Linear Technology Inc. All rights reserved. TEXT -3792 -40 Bottom 2 ;LTC3810 - 100V Current Mode Synchronous Switching Regulator Controller\n36V to 72V Input Voltage to 12V @ 10A Buck Regulator\nInput: 36V-72V Output: 12V @ 10A