Version 4 SHEET 1 2300 1348 WIRE -224 -240 -320 -240 WIRE -112 -240 -224 -240 WIRE 32 -240 -112 -240 WIRE 176 -240 32 -240 WIRE 624 -240 176 -240 WIRE -320 -224 -320 -240 WIRE -224 -224 -224 -240 WIRE -112 -224 -112 -240 WIRE 32 -224 32 -240 WIRE 464 -192 304 -192 WIRE 560 -192 464 -192 WIRE 560 -176 560 -192 WIRE 464 -160 464 -192 WIRE 176 -144 176 -240 WIRE 304 -144 304 -192 WIRE -320 -128 -320 -144 WIRE -224 -128 -224 -160 WIRE -112 -128 -112 -160 WIRE -64 -80 -80 -80 WIRE 32 -80 32 -144 WIRE 32 -80 16 -80 WIRE 64 -80 32 -80 WIRE 464 -80 464 -96 WIRE 464 -80 416 -80 WIRE 560 -80 560 -112 WIRE 624 -64 624 -240 WIRE -224 16 -240 16 WIRE -144 16 -160 16 WIRE -96 16 -144 16 WIRE 64 16 -96 16 WIRE 576 16 416 16 WIRE 464 32 464 -80 WIRE -32 112 -48 112 WIRE 64 112 48 112 WIRE 464 112 464 96 WIRE 464 112 416 112 WIRE 624 112 624 32 WIRE 624 112 464 112 WIRE 672 112 624 112 WIRE 784 112 752 112 WIRE 800 112 784 112 WIRE 896 112 880 112 WIRE 976 112 896 112 WIRE 1024 112 976 112 WIRE 1136 112 1024 112 WIRE 624 128 624 112 WIRE 1024 128 1024 112 WIRE 1136 128 1136 112 WIRE -144 208 -144 16 WIRE -96 208 -96 16 WIRE 64 208 -96 208 WIRE 576 208 416 208 WIRE 1024 224 1024 192 WIRE 1136 224 1136 208 WIRE 624 240 624 224 WIRE -144 304 -144 288 WIRE 64 304 -144 304 WIRE 464 304 416 304 WIRE 672 304 464 304 WIRE 784 304 784 112 WIRE 784 304 752 304 WIRE -144 320 -144 304 WIRE 464 320 464 304 WIRE -32 400 -48 400 WIRE 64 400 32 400 WIRE 464 400 464 384 WIRE 464 400 416 400 WIRE 592 400 464 400 WIRE 896 400 896 112 WIRE 896 400 672 400 WIRE 976 400 976 112 WIRE -144 416 -144 400 WIRE -112 496 -128 496 WIRE -32 496 -48 496 WIRE 64 496 48 496 WIRE 976 496 976 480 WIRE 976 496 416 496 WIRE 976 512 976 496 WIRE 240 592 240 560 WIRE 976 608 976 592 FLAG -48 112 0 FLAG -240 16 0 FLAG -128 496 0 FLAG -48 400 0 FLAG -224 -128 0 FLAG -112 -128 0 FLAG 1024 224 0 FLAG 240 592 0 FLAG 976 608 0 FLAG 624 240 0 FLAG 560 -80 0 FLAG -144 416 0 FLAG 1136 112 OUT FLAG -320 -240 IN FLAG 1136 224 0 FLAG -320 -128 0 FLAG -80 -80 0 SYMBOL PowerProducts\\LT3741 240 208 R0 SYMATTR InstName U1 SYMBOL ind 656 128 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 5 56 VBottom 0 SYMATTR InstName L1 SYMATTR Value 1µ SYMBOL res 784 128 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R1 SYMATTR Value 2.5m SYMBOL cap 1008 128 R0 WINDOW 3 31 51 Left 0 WINDOW 123 29 76 Left 0 SYMATTR Value 330µ SYMATTR Value2 x3 SYMATTR InstName C1 SYMBOL res 64 96 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R2 SYMATTR Value 82.5K SYMBOL cap -160 0 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C2 SYMATTR Value .001µ SYMBOL res 64 480 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R3 SYMATTR Value 47.5K SYMBOL cap -48 480 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C3 SYMATTR Value .0047µ SYMBOL cap 32 384 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C4 SYMATTR Value .001µ SYMBOL cap -240 -224 R0 SYMATTR InstName C5 SYMATTR Value 100µ SYMBOL cap -128 -224 R0 SYMATTR InstName C6 SYMATTR Value 1µ SYMBOL res 960 384 R0 SYMATTR InstName R4 SYMATTR Value 38.3K SYMBOL res 960 496 R0 SYMATTR InstName R5 SYMATTR Value 12.1K SYMBOL res 768 288 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R6 SYMATTR Value 10 SYMBOL res 688 384 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R7 SYMATTR Value 10 SYMBOL cap 448 320 R0 WINDOW 3 26 55 Left 0 SYMATTR Value .0022µ SYMATTR InstName C7 SYMBOL cap 544 -176 R0 SYMATTR InstName C8 SYMATTR Value 4.7µ SYMBOL schottky 448 -160 R0 SYMATTR InstName D1 SYMATTR Value BAT54 SYMBOL cap 448 32 R0 SYMATTR InstName C9 SYMATTR Value 100n SYMBOL res -160 192 R0 SYMATTR InstName R8 SYMATTR Value 45.3K SYMBOL res -160 304 R0 SYMATTR InstName R9 SYMATTR Value 470K SYMBOL nmos 576 128 R0 SYMATTR InstName Q1 SYMATTR Value RJK0346DPA SYMBOL nmos 576 -64 R0 SYMATTR InstName Q2 SYMATTR Value RJK0365DPA SYMBOL voltage -320 -240 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 12 SYMBOL res 16 -240 R0 SYMATTR InstName R10 SYMATTR Value 50K SYMBOL res 32 -96 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R11 SYMATTR Value 50K SYMBOL res 1120 112 R0 SYMATTR InstName Rload SYMATTR Value 15 TEXT 696 576 Left 0 !.tran 1.2m startup TEXT -528 648 Left 0 !.model RJK0365DPA VDMOS(Rg=.8 Vto=1.85 Rd=2.7m Rs=.7m Rb=1.3m Kp=40.8 Lambda=.07 Cgdmax=0.17n Cgdmin=.05n Cgs=0.67n Cjo=.98n Is=48p mfg=Renesas Vds=30 Ron=8.9m Qg=7.6n)\n.model RJK0346DPA VDMOS(Rg=1.2 Vto=1.85 Rd=1.9m Rs=.7m Rb=1.3m Kp=40.8 Lambda=.07 Cgdmax=1.05n Cgdmin=.05n Cgs=4.2n Cjo=.98n Is=48p mfg=Renesas Vds=30 Ron=1.9m Qg=49n) TEXT 344 -264 Bottom 0 ;LT3741 - High Power, Constant Current, Constant Voltage, Step-Down Controller\nSuper Capacitor Charger, Input: 12V, Output: 5V @350mA TEXT -344 728 Left 0 ;Notes:\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.