1 dc1819afa demo manual dc1819a parameter conditions value minimum input voltage vinx 1.7v maximum input voltage vinx 5.5v maximum output current climx resistor-adjustable 4a climx internal limit 6a climx clamp voltage current limit 0.5v forward voltage drop vinx = 3.6v, ioutx = 1a 50mv typ reverse turn-off voltage vinx C voutx C30mv enable threshold en1 and en2 800mv description LTC4415EMSE dual 4a ideal diodes with adjustable current limit demonstration circuit 1819a features the ltc ? 4415emse dual ideal diodes. each independent ideal diode can be used to replace a standard diode for improved low forward drop in applications requiring maximum headroom and overall system efficiency. the input supply voltage ranges are from 1.7v to 5.5v for each input/output pair. as initially configured, ltc4415 can provide a maximum current limit of 4a for each diode, but is jumper-selectable up to 6a (internal current limit). the voltage of the current limit pins, clim1 and clim2, can also be monitored for a scaled representation of the output current. for evaluation, each diode can be controlled by the en- able control jumper, jp1, or by the enable input pins, l , lt, ltc, ltm, module, linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. performance summary en1 and en2 . as initially configured, by setting to both the user can apply input voltages and loads on each diode independently. selecting priority allows the ltc4415 to automatically switch over between inputs when the proper input voltage threshold on in1 is achieved. status and warning leds and test points are provided for the logic output pins stat1 , stat2 and warn1 , warn2 , respectively. optionally, the ltc4415edhc version can also be used for evaluation. it is a pin-compatible drop-in replacement. design files for this circuit board are available at http://www.linear.com/demo (t a = 25c)
2 dc1819afa demo manual dc1819a quick start procedure demonstration circuit 1819a is easy to set up to evaluate the performance of the ltc4415. refer to figure 1 for proper measurement equipment setup and follow the procedure below. 1. set the jumpers as below: jp1 jp2 jp3 both 4a 4a 2. with all power off, connect input 1 and 2 (vin1 and vin2) power supplies capable of at least 4a each, the loads (vout1 and vout2), and meters as shown in figure 1. 3. preset the system loads to 0a and the input supplies to 0v, 0a current limit. 4. turn on the supplies, setting the current limit above 4a. adjust the voltages to the desired value, up to 5.5v. 5. turn on the loads and adjust as necessary. 6. monitor clim1 and clim2 pin voltages for a scaled representation of the output currents. 7. adjust the supply voltages further and observe how the output states change accordingly. stat1 and stat2 will change state if the input voltage drops below the uvlo threshold. 8. adjust the loads into current limit and observe how the warn1 and warn2 states change accordingly. optional 1. for prioritization enable switchover set jumper jp1 to priority. 2. for independent, external control of the enable pins, remove the shunt on jumper jp1. apply the logic control signal on en1 and en2 as necessary. 3. with all power off, change the clim1 and clim2 settings on jumpers jp2 and jp3 for different current limits. 4. for load sharing or evaluation of the diode-or func- tion, connect the two diode outputs, out1 and out2, together. the source of highest voltage will appear at the output. 5. for independent path control from a common input, connect the two diode inputs, in1 and in2, together.
3 dc1819afa demo manual dc1819a quick start procedure figure 1. proper measurement equipment setup + C + C load1 + C + C load2 + C vin1 + C vin2 + C + C
4 dc1819afa demo manual dc1819a parts list item qty reference part description manufacturer/part number required circuit components 1 4 c1, c2, c3, c4 cap , chip , x5r,10f, 10%, 16v, 0805 murata, grm21br61c106ke15l 2 1 r1 res, chip , 100k, 1%, 1/16w, 0402 vishay, crcw0402100kfked 3 1 r2 res, chip , 2k, 1%, 1/16w, 0402 vishay, crcw04022k00fked 4 1 r3 res, chip , 21.5k, 1%, 1/10w, 0402 vishay, crcw040221k5fked 5 2 r9, r10 res, chip , 1k, 1%, 1/16w, 0402 vishay, crcw04021k00fked 6 1 u1 ic, LTC4415EMSE linear tech., LTC4415EMSE#pbf additional demo board circuit components 1 4 c5, c6, c7, c8 cap , chip , x5r,10f, 10%, 6.3v, 0603 tdk, c1608x5r0j106k 2 2 d1, d2 led, smt, green, 0603 lite-on, ltst-c190kgkt 3 2 d3, d4 led, smt, yellow, 0603 lite-on, ltst-c190ykt 4 2 r4, r5 res, chip , 10k, 5%, 1/16w, 0402 vishay, crcw040210k0jned 5 2 r6, r13 res, chip , 143, 1%, 1/16w, 0402 vishay, crcw0402143rfked 6 2 r8, r12 res, chip , 332, 1%, 1/16w, 0402 vishay, crcw0402332rfked 7 4 r14, r15, r16, r17 res, chip , 1k, 5%, 1/16w, 0402 vishay, crcw04021k00jned 8 2 r7, r11 res, chip , 1k, 1%, 1/16w, 0402 vishay, crcw04021k00fked 9 4 r18, r19, r20, r21 res, chip , 1, 5%, 1/16w, 0402 vishay, crcw04021r00jned hardware/components (for demo board only) 2 8 e1, e2, e5, e8, e14, e15, e16, e17 test point, turret, 0.094" mill-max, 2501-2-00-80-00-00-07-0 1 9 e3, e4, e6, e7, e9, e10, e11, e12, e13 test point, turret, 0.061" mill-max, 2308-2-00-80-00-00-07-0 3 1 jp1 3 pin jumper, 2mm samtec, tmm-103-02-l-s 4 2 jp2, jp3 2 5 pin jumper, 2mm samtec, tmm-105-02-l-d 5 3 jp1-3 shunt, 2mm samtec, 2sn-kb-g 6 4 stand-off, nylon, 0.500" keystone, 8833
5 dc1819afa demo manual dc1819a information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. schematic diagram 4 4 3 3 2 2 1 1 4 4 3 3 2 2 1 1 unless noted: resistors: ohms, 0402, 1%, 1/16w capacitors: uf, 0402, 10%, 50v 1.7v - 5.5v 1.7v - 5.5v both enable control priority ylw grn ylw grn 2a internal 6a 4a 4a 2a 1a iout (a) = 500/rclprog 0.5a 6a internal 1a 0.5a 4a 4a 1.7v - 5.5v 1.7v - 5.5v clim1 clim2 josh y. production fab 2 08-19-11 revision history description date approved eco rev 2 demo circuit 1819a 1 1 dual 4a ideal diodes with adjustable current limit n/a LTC4415EMSE nc josh y. 08-19-11 size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect ci rcuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com vin1 vin2 vin2 vin1 e6 gnd r12 332 r19 1 5% r16 1k 5 % c1 10 f 0805 16v e1 vin1 e5 vin2 c5 10 f 6.3v 0603 jp1 r5 10k e3 en1 r13 143 r2 2k e14 warn2 e4 en2 d3 stat2 1 2 d1 stat1 1 2 c6 10 f 6.3v 0603 c4 10 f 16v 0805 u1 LTC4415EMSE 1 3 10 7 17 15 14 2 4 8 5 6 9 16 13 12 11 in1 en1 out2 in2 gnd out1 stat1 in1 clim1 in2 clim2 en2 out2 out1 warn1 warn2 stat2 r4 10k e8 clim2 e15 vout1 r8 332 r20 1 5% c3 10 f 16v 0805 r1 100k e13 stat2 e16 gnd jp2 r15 1k 5 % r7 1k r17 1k 5 % e12 warn1 e17 vout2 c8 10 f 6.3v 0603 e10 gnd e7 clim1 e11 stat1 e18 gnd r6 143 r3 21.5k d2 warn1 1 2 r21 1 5% d4 warn2 1 2 c7 10 f 6.3v 0603 r9 1k e9 gnd r10 1k jp3 r11 1k c2 10 f 0805 16v r14 1k 5 % r18 1 5% e2 gnd
6 dc1819afa demo manual dc1819a linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 2011 lt 1011 rev a ? printed in usa demonstration board important notice linear technology corporation (ltc) provides the enclosed product(s) under the following as is conditions: this demonstration board (demo board) kit being sold or provided by linear technology is intended for use for engineering development or evaluation purposes only and is not provided by ltc for commercial use. as such, the demo board herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. as a prototype, this product does not fall within the scope of the europ ean union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or ot her regulations. if this evaluation kit does not meet the specifications recited in the demo board manual the kit may be returned within 30 days from the date of delivery for a full refund. the foregoing warranty is the exclusive warranty made by the seller to buyer and is in lieu of all other warranties, expressed, implied, or statutory, including any warranty of merchantability or fitness for any particular purpose. except to the extent of this indemnity, neither party shall be liable to the other for any indirect, special, incidental, or consequential damages. the user assumes all responsibility and liability for proper and safe handling of the goods. further, the user releases ltc fro m all claims arising from the handling or use of the goods. due to the open construction of the product, it is the users responsibility to take any and all appropriate precautions with regard to electrostatic discharge. also be aware that the products herein may not be regulatory co mpliant or agency certified (fcc, ul, ce, etc.). no license is granted under any patent right or other intellectual property whatsoever. ltc assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind . ltc currently services a variety of customers for products around the world, and therefore this transaction is not exclusive . please read the demo board manual prior to handling the product . persons handling this product must have electronics training and observe good laboratory practice standards. common sense is encouraged . this notice contains important safety information about temperatures and voltages. for further safety concerns, please contact a ltc applica- tion engineer. mailing address: linear technology 1630 mccarthy blvd. milpitas, ca 95035 copyright ? 2004, linear technology corporation
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