Version 4 SHEET 1 1344 836 WIRE 272 -224 272 -240 WIRE -176 -144 -272 -144 WIRE 144 -144 -176 -144 WIRE 576 -144 144 -144 WIRE -272 -128 -272 -144 WIRE 272 -128 272 -160 WIRE 432 -128 272 -128 WIRE -176 -112 -176 -144 WIRE 144 -112 144 -144 WIRE 272 -112 272 -128 WIRE -64 -48 -80 -48 WIRE 32 -48 16 -48 WIRE 432 -48 432 -64 WIRE 432 -48 384 -48 WIRE -272 -32 -272 -48 WIRE -176 -32 -176 -48 WIRE 576 -32 576 -144 WIRE -64 48 -80 48 WIRE 16 48 0 48 WIRE 32 48 16 48 WIRE 528 48 384 48 WIRE 432 64 432 -48 WIRE 16 96 16 48 WIRE 16 96 -112 96 WIRE -64 144 -80 144 WIRE 32 144 16 144 WIRE 432 144 432 128 WIRE 432 144 384 144 WIRE 576 144 576 64 WIRE 576 144 432 144 WIRE 640 144 576 144 WIRE 688 144 640 144 WIRE 800 144 768 144 WIRE 816 144 800 144 WIRE 912 144 896 144 WIRE 944 144 912 144 WIRE 992 144 944 144 WIRE 1088 144 992 144 WIRE -160 160 -240 160 WIRE 576 160 576 144 WIRE 992 160 992 144 WIRE 640 176 640 144 WIRE -240 192 -240 160 WIRE -160 240 -160 160 WIRE 32 240 -160 240 WIRE 528 240 384 240 WIRE 992 240 992 224 WIRE 1088 240 1088 224 WIRE 640 256 640 240 WIRE 640 256 576 256 WIRE 576 272 576 256 WIRE -240 304 -240 272 WIRE -112 336 -112 96 WIRE -16 336 -16 320 WIRE -16 336 -112 336 WIRE 32 336 -16 336 WIRE 448 336 384 336 WIRE 544 336 448 336 WIRE 800 336 800 144 WIRE 800 336 624 336 WIRE 448 352 448 336 WIRE -48 432 -80 432 WIRE 32 432 16 432 WIRE 448 432 448 416 WIRE 448 432 384 432 WIRE 544 432 448 432 WIRE 912 432 912 144 WIRE 912 432 624 432 WIRE 944 432 944 144 WIRE -208 528 -240 528 WIRE -96 528 -144 528 WIRE 32 528 -16 528 WIRE 944 528 944 512 WIRE 944 528 384 528 WIRE 944 544 944 528 WIRE 208 608 208 592 WIRE 944 640 944 624 FLAG 208 608 0 FLAG -272 -32 0 FLAG 272 -240 0 FLAG 576 272 0 FLAG 944 640 0 FLAG 992 240 0 FLAG -80 432 0 FLAG -240 528 0 FLAG -80 144 0 FLAG -80 -48 0 FLAG -80 48 0 FLAG -176 -32 0 FLAG 1088 240 0 FLAG -240 304 0 SYMBOL PowerProducts\\LT3741 208 240 R0 SYMATTR InstName U1 SYMBOL voltage -272 -144 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 12 SYMBOL cap 256 -224 R0 SYMATTR InstName C1 SYMATTR Value 2.2µ SYMBOL cap 416 64 R0 SYMATTR InstName C2 SYMATTR Value .22µ SYMBOL schottky 416 -128 R0 SYMATTR InstName D1 SYMATTR Value 1N5819 SYMATTR Description Diode SYMATTR Type diode SYMBOL nmos 528 -32 R0 SYMATTR InstName Q1 SYMATTR Value RJK0305DPB SYMBOL nmos 528 160 R0 WINDOW 3 28 101 Right 2 WINDOW 0 50 29 Left 2 SYMATTR Value RJK0301DPB SYMATTR InstName Q2 SYMBOL ind 672 160 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName L1 SYMATTR Value 1.3µ SYMATTR SpiceLine Rser=.002 SYMBOL res 800 160 R270 WINDOW 0 32 56 VTop 2 WINDOW 3 0 56 VBottom 2 SYMATTR InstName R1 SYMATTR Value 2.5m SYMBOL res 928 416 R0 SYMATTR InstName R2 SYMATTR Value 100K SYMBOL res 928 528 R0 SYMATTR InstName R3 SYMATTR Value 1K SYMBOL cap 976 160 R0 SYMATTR InstName C3 SYMATTR Value 400µ SYMBOL cap -144 512 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 WINDOW 39 60 32 VTop 2 SYMATTR InstName C4 SYMATTR Value 4.7n SYMBOL cap 16 416 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C5 SYMATTR Value 1n SYMBOL res 32 128 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 100K SYMBOL voltage 32 -48 R90 WINDOW 0 -32 56 VBottom 2 WINDOW 3 32 56 VTop 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value 5 SYMBOL cap 0 32 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C6 SYMATTR Value .01µ SYMBOL cap -192 -112 R0 SYMATTR InstName C7 SYMATTR Value 100µ SYMBOL res 0 512 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 66.5K SYMBOL schottky 656 240 R180 WINDOW 0 -18 64 Left 2 WINDOW 3 -43 3 Left 2 SYMATTR InstName D3 SYMATTR Value SS24 SYMBOL res 640 320 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 10 SYMBOL res 640 416 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R7 SYMATTR Value 10 SYMBOL cap 432 352 R0 SYMATTR InstName C8 SYMATTR Value 33n SYMBOL res 1072 128 R0 SYMATTR InstName R8 SYMATTR Value 100 SYMBOL voltage -240 176 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V3 SYMATTR Value 0.25 TEXT 528 584 Left 2 !.tran 30m startup TEXT 264 -272 Bottom 2 ;LT3741 - High Power, Constant Current, Constant Voltage, Step-Down Controller\nInput: 12V Output: Up to 6V, 20A. TEXT -320 656 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 © 2010 Linear Technology Inc. All rights reserved.