Version 4 SHEET 1 2520 920 WIRE -32 -176 -144 -176 WIRE 112 -176 -32 -176 WIRE 224 -176 112 -176 WIRE 256 -176 224 -176 WIRE 336 -176 320 -176 WIRE 352 -176 336 -176 WIRE 448 -176 432 -176 WIRE -32 -160 -32 -176 WIRE 112 -160 112 -176 WIRE 224 -160 224 -176 WIRE -208 -80 -304 -80 WIRE -96 -80 -208 -80 WIRE -32 -80 -32 -96 WIRE -32 -80 -96 -80 WIRE 112 -80 112 -96 WIRE 112 -80 -32 -80 WIRE -304 -64 -304 -80 WIRE -208 -64 -208 -80 WIRE -96 -64 -96 -80 WIRE 224 -64 224 -96 WIRE 224 -64 0 -64 WIRE 112 -48 112 -80 WIRE 224 -48 224 -64 WIRE 336 -48 336 -176 WIRE 0 16 0 -64 WIRE 16 16 0 16 WIRE 560 16 432 16 WIRE 656 16 560 16 WIRE 704 16 656 16 WIRE 816 16 784 16 WIRE -304 32 -304 16 WIRE -208 32 -208 0 WIRE -96 32 -96 0 WIRE 560 32 560 16 WIRE 656 32 656 16 WIRE 816 32 816 16 WIRE -32 112 -32 -80 WIRE 16 112 -32 112 WIRE 464 112 432 112 WIRE 464 128 464 112 WIRE 560 128 560 96 WIRE 656 128 656 112 WIRE 816 128 816 112 WIRE 464 208 464 192 WIRE 464 208 432 208 WIRE 512 208 464 208 WIRE 624 208 624 192 WIRE 624 208 592 208 WIRE -144 304 -144 -176 WIRE -96 304 -144 304 WIRE 16 304 -16 304 WIRE 624 304 624 288 WIRE 624 304 432 304 WIRE 16 400 0 400 WIRE 464 400 432 400 WIRE 512 400 464 400 WIRE 624 400 624 384 WIRE 624 400 512 400 WIRE 720 400 624 400 WIRE 512 416 512 400 WIRE 720 416 720 400 WIRE 624 432 624 400 WIRE -80 480 -96 480 WIRE 96 480 96 464 WIRE 96 480 0 480 WIRE 272 480 272 464 WIRE 272 480 208 480 WIRE 128 496 16 496 WIRE 176 496 176 464 WIRE 176 496 128 496 WIRE 272 496 272 480 WIRE 16 512 16 496 WIRE 128 512 128 496 WIRE 208 512 208 480 WIRE 512 512 512 480 WIRE 624 512 624 496 WIRE 720 512 720 496 WIRE -144 672 -144 304 WIRE 16 672 16 576 WIRE 16 672 -144 672 WIRE 128 672 128 656 WIRE 128 672 16 672 WIRE 208 672 208 576 WIRE 208 672 128 672 WIRE 272 672 272 576 WIRE 272 672 208 672 WIRE 352 672 352 464 WIRE 352 672 272 672 WIRE 464 672 464 400 WIRE 464 672 352 672 FLAG 0 400 0 FLAG -304 32 0 FLAG 720 400 OUT FLAG -304 -80 IN FLAG 624 192 0 FLAG 448 -176 0 FLAG 720 512 0 FLAG 512 512 0 FLAG -96 32 0 FLAG -208 32 0 FLAG -96 480 0 FLAG 624 512 0 FLAG 560 128 0 FLAG 656 128 0 FLAG 816 128 0 FLAG 816 16 CTRL SYMBOL res 256 480 R0 WINDOW 3 28 86 Left 2 SYMATTR Value 200K SYMATTR InstName R1 SYMBOL cap 192 512 R0 SYMATTR InstName C1 SYMATTR Value 1n SYMBOL res 0 288 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 200K SYMBOL VOLTAGE -304 -80 R0 WINDOW 123 24 138 Left 2 WINDOW 39 24 117 Left 2 SYMATTR Value 12 SYMATTR InstName V1 SYMBOL cap 208 -160 R0 SYMATTR InstName C2 SYMATTR Value 2.2µ SYMATTR SpiceLine Rser=10m SYMBOL ind 496 224 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L1 SYMATTR Value 5.6µ SYMATTR SpiceLine Rser=23m SYMBOL cap 448 128 R0 SYMATTR InstName C3 SYMATTR Value .1µ SYMBOL cap 496 416 R0 WINDOW 123 24 64 Left 2 WINDOW 3 38 38 Left 2 SYMATTR Value2 x2 SYMATTR Value 22µ SYMATTR InstName C4 SYMATTR SpiceLine Rser=20m SYMBOL PowerProducts\\LTC7149 224 208 R0 SYMATTR InstName U1 SYMBOL cap -112 -64 R0 SYMATTR InstName C5 SYMATTR Value 10µ SYMATTR SpiceLine Rser=0.005 SYMBOL polcap -224 -64 R0 SYMATTR InstName C6 SYMATTR Value 10µ SYMATTR SpiceLine Rser=0.12 SYMBOL polcap 608 432 R0 SYMATTR InstName C7 SYMATTR Value 150µ SYMATTR SpiceLine Rser=50m SYMBOL res 112 496 R0 SYMATTR InstName R3 SYMATTR Value 1K SYMBOL cap 112 592 R0 SYMATTR InstName C8 SYMATTR Value 4.7n SYMBOL cap 0 512 R0 SYMATTR InstName C9 SYMATTR Value 100p SYMBOL cap -48 -160 R0 SYMATTR InstName C10 SYMATTR Value 2.2µ SYMATTR SpiceLine Rser=0.01 SYMBOL cap 96 -160 R0 SYMATTR InstName C11 SYMATTR Value 1µ SYMATTR SpiceLine Rser=0.01 SYMBOL res 16 464 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 20 SYMBOL res 448 -192 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 10 SYMBOL cap 256 -160 R270 WINDOW 3 0 32 VBottom 2 WINDOW 0 32 32 VTop 2 SYMATTR Value 1µ SYMATTR InstName C12 SYMBOL res 608 192 R0 SYMATTR InstName R6 SYMATTR Value 1Meg SYMBOL res 608 288 R0 SYMATTR InstName R7 SYMATTR Value 137K SYMBOL cap 544 32 R0 SYMATTR InstName C13 SYMATTR Value .01µ SYMBOL res 640 16 R0 SYMATTR InstName R8 SYMATTR Value 10K SYMBOL res 800 0 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R9 SYMATTR Value 100 SYMBOL voltage 816 16 R0 WINDOW 123 24 124 Left 2 WINDOW 39 24 152 Left 2 WINDOW 40 24 180 Left 2 SYMATTR Value2 +1.5m 0 SYMATTR SpiceLine +1m 2.5 SYMATTR SpiceLine2 +1m 0) SYMATTR Value PWL(0 0 SYMATTR InstName V2 SYMBOL res 704 400 R0 SYMATTR InstName Rload SYMATTR Value 5 TEXT 520 648 Left 2 !.tran 4m startup uic TEXT -312 680 Left 2 ;Notes:\n For noise suppression filter R9/C13 is used. R8 needed to guarantee that Voutsns is never left floating.\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 © 2016 Linear Technology Inc. All rights reserved. TEXT 736 -48 Bottom 2 ;Vout Control Circuit TEXT 312 -224 Bottom 2 ;LTC7149 - 60V, 4A Synchronous Step-Down Regulator for Inverting Outputs\nInverting Buck Regulator with Output Voltage Control\nInput: 3.4V to 50V Output: 2.5V to -10V @ 2A CIRCLE Normal 464 -112 1024 192 2