1 description lt m4643ev quad dc/dc module regulator with configurable 3a output array demonstration circuit 2453a features the lt m ? 4643 module ? regulator, a high performance high efficiency 4? output step-down regulator. the LTM4643EV has an operating input voltage range of 4v to 20v and is able to provide up to 3a out output current from each of its phases. each outputs voltage is programmable from 0.6v to 3.3v . the ltm4643 ev is a complete dc/dc point of load regulator in a thermally enhanced 15mm 9mm ?? 1.82mm lga package requiring only a few input and output ca - pacitors. output voltage tracking is available through the l , lt, ltc, ltm, linear technology, the linear logo and module are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. boar d p hoto track/ss pin for supply rail sequencing. external clock synchronization is also available through the clkin pin. the clkout pin provides for synchronization of additional modules phases. the ltm4643 data sheet must be read in conjunction with this demo manual for working on or modifying demo circuit 2453a. design files for this circuit board are available at http://www.linear.com/demo/dc2453a figure 1. quad 3a ltm4643; dc2453a dc2453afb demo manual dc2453a
2 quick s tart p roce d ure demonstration circuit 2453a is an easy way to evaluate the performance of the ltm4643 ev. please refer to figure 1 for test setup connections and follow the procedure below. 1. with power off, place the jumpers in the following positions: jp1 jp2 jp3 jp2 run1 run2 run3 run4 on on on on jp8 jp7 jp6 jp5 mode1 mode2 mode3 mode4 ccm ccm ccm ccm 2. before connecting input supply, loads and meters, preset the input voltage supply to be between 4v to 20v. preset the load currents to 0a. 3. with power off, connect the loads, input voltage supply and meters as shown in figure 1. 4. turn on input power supply . the output voltage meters for each phase should display the programmed output voltage 2%. 5. once the proper output voltage is established, adjust the load currents for each phase within the 0a to 3a range and observe the load regulation, efficiency, and other parameters. output voltage ripple should be measured at j6 with a bnc cable and oscilloscope. 6. to obser ve increased light load efficiency place, a mode pin jumper (jp5-jp8) in the dcm mode position. p erformance s ummary parameter conditions/notes value input voltage range 4v C 20v output voltage v out jumper selectable v out1 = 3.3vdc, v out2 = 2.5vdc, v out3 = 1.5vdc, v out4 = 1.2vdc maximum continuous output current per phase derating is necessary for certain operating conditions. see data sheet for details 3adc default operating frequency 1.2mhz efficiency v in = 12v, v out1 = 3.3v, i out = 3a 89% see figure 2 dc2453afb demo manual dc2453a
3 figure 2. test setup of dc2453a quick s tart p roce d ure dc2453afb demo manual dc2453a
4 figure 2. measured supply efficiency at 5v in and 12v in figure 3. measured v out1 = 3.3v and v out4 = 1.2v load transient responses (1.5a to 3a load step) quick s tart p roce d ure v in (v) v out (v) c out ceramic 12 3.3 2 47f/6.3v/ceramic v in (v) v out (v) c out ceramic 12 1.2 2 47f/6.3v/ceramic v out1 100mv/div i out1 _step 1a/div v out1 100mv/div i out1 _step 1a/div dc2453afb demo manual dc2453a 65 70 75 80 85 90 95 100 efficiency (%) dc2453a f02a output current (a) 3.3v out1 2.5v out2 1.5v out3 1.2v out4 output current (a) 0 0.5 1 1.5 2 0 2.5 3 65 70 75 80 85 90 95 100 0.5 efficiency (%) dc2453a f02b 3.3v out1 2.5v out2 1.5v out3 1.2v out4 1 1.5 2 2.5 3
5 figure 4. measured thermal capture with all phases at full load (3a) v in (v) airflow ambient (c) 5 natural convection 28 quick s tart p roce d ure dc2453afb demo manual dc2453a
6 p arts list item qty reference part description manufacturer/part number required circuit components 1 2 c1, c3 cap, cer, 22f, 25v, x5r, 20%, 1206 murata, grm31cr61e226me15l 2 1 c6 cap, x5r, 1f, 16v 10%, 0603 avx, 0603yd105kat2a 3 4 c9, c17 ,c28, c36 cap, cer, 47f, 6.3v, x5r, 20%,1210 avx, 12106d476mat2a 4 4 c10, c16, c29, c35 cap, cer, 47f, 6.3v, x5r, 20%, 1206 taiyo yuden, jmk316abj476mlht 5 4 c25, c26, c45, c46 cap, cer, 0.10f, 50v, x7r, 10%, 0603 tdk, c1608x7r1h104k 6 1 r1 res, 10k, 1%, 1/10w, 0603 vishay, crcw060310k0fked 7 1 r2 res, 1?, 5%, 1/10w, 0603 vishay,crcw06031r00jnea 8 1 r3 res, 13.3k, 1%, 1/10w, 0603 vishay crcw060313k3fkea 9 1 r4 res, 40.2k, 1%, 1/10w, 0603 vishay crcw060340k2fkea 10 1 r11 res, 19.1k, 1%, 1/10w, 0603 vishay crcw060319k1fkea 11 1 r12 res, 60.4k, 1%, 1/10w, 0603 vishay crcw060360k4fkea 12 1 r28 res, 0805, 0? 5% 1/16w vishay, crcw08050000z0ea 13 1 u1 LTM4643EV, bga-15x9-5.01 linear tech. corp. LTM4643EV#pbf additional demo board circuit components 1 2 c4, c5 cap, cer, 22f, 25v, x5r, 20%, 1206 murata, grm31cr61e226me15l 2 1 c2 cap, poscap, 33f, 25v, 7343 panasonic, 25tqc33myf 3 6 c7, c21, c22, c31, c41, c42 cap, 0603 option 4 4 c8, c18, c27, c37 cap, poscap, 7343 option 5 8 c11, c12, c14, c15, c30, c33, c34, c38 cap, cer, 1206 option 6 2 c13, c32 cap, cer, 100pf, 25v, x7r, 10%, 0603 avx 06033c101kat2a 7 4 r7, r8, r15, r16 res, 0?, 1%, 1/10w, 0603 vishay, crcw06030000z0ed 8 4 r19, r20, r21, r22 res, 150k, 5%, 1/10w, 0603 vishay crcw0603150kjnea 9 8 r23, r24, r25, r26, r27, r29, r30, r31 res, 100k, 5%, 1/10w, 0603 vishay crcw0603100kjnea 10 16 r9, r10, r17, r18, r32-r35, r37-r40, r42-r45 res, 0603,opt opt 11 3 r36, r41, r46 res, 0 ohm, 2512,opt opt hardware 1 16 e1, e3-e17 testpoint, turret 0.094" mill max 2501-2-00-80-00-00-07-0 2 2 j1, j2 jack, banana keystone 575-4 3 8 jp1-jp8 header, 0.079" single row, 3-pin sullins, nrpn031paen-rc 4 8 xjp1-xjp8 shunt, 0.079" center samtec, 2sn-bk-g 5 4 stand-offs st and-off , nylon 0.375" tall (snap on) keystone, 8832 dc2453afb demo manual dc2453a
7 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. s chematic diagram 5 5 4 4 3 3 2 2 1 1 d d c c b b a a 4v - 20v gnd vout3 gnd clkin track2 vin 1.5v / 3a max 1.2v / 3a max vout4 gnd 3.3v / 3a max vout1 gnd 2.5v / 3a max vout2 gnd temp on off on off on off on off track1 track3 track4 optional jumpers for parallel operation ccm dcm 7343 7343 7343 run1 run2 run3 run4 7343 7343 m 1210 1210 1210 1210 vin+ gnd note: unless otherwise specified 1. all resistors and capacitors are 0603. mode4 ccm dcm mode3 ccm dcm mode2 ccm dcm mode1 vin vout3 intvcc3 intvcc4 vout4 intvcc1 ss1 fb1 vout1 comp1 intvcc2 ss2 comp2 ss3 ss4 fb1 fb3 fb4 fb2 fb2 fb3 comp2 comp3 comp1 comp3 comp4 comp2 ss2 ss3 ss1 ss3 ss4 ss2 run2 run3 run1 run3 run4 run2 comp4 comp3 vout2 vout3 vout1 vout3 vout4 vout2 fb2 fb4 fb3 vout2 intvcc1 intvcc2 intvcc3 intvcc4 vin run1 run2 run3 run4 run1 run2 run3 run4 intvcc4 intvcc3 intvcc1 intvcc2 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 circuit 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 1 LTM4643EV wednesday, july 29, 2015 1 1 quad 3a step-down module regulator lt sam y. n/a demo circuit 2453a 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 circuit 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 1 LTM4643EV wednesday, july 29, 2015 1 1 quad 3a step-down module regulator lt sam y. n/a demo circuit 2453a 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 circuit 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 1 LTM4643EV wednesday, july 29, 2015 1 1 quad 3a step-down module regulator lt sam y. n/a demo circuit 2453a revision history description date approved eco rev sam y. production 1 07-29-15 _ revision history description date approved eco rev sam y. production 1 07-29-15 _ revision history description date approved eco rev sam y. production 1 07-29-15 _ jp3 1 2 3 r25 100k 1% r20 150k + c8 opt jp7 1 2 3 jp1 1 2 3 r8 0 r1 10k e4 r38 opt r18 opt c22 opt r39 opt c4 22uf 25v 1206 c25 0.1uf tp2 pgood2 c30 opt 1206 r45 opt r12 60.4k r35 opt e7 c32 100pf c5 22uf 25v 1206 r28 0 0805 r46 opt2512 + c37 opt c21 opt tp1 pgood1 jp5 1 2 3 r10 opt c41 opt jp2 1 2 3 jp8 1 2 3 + c18 opt c3 22uf 25v 1206 c13 100pf e11 j2 c38 opt 1206 tp3 pgood3 e10 c14 opt 1206 c46 0.1uf c26 0.1uf jp4 1 2 3 c9 47uf 6.3v r26 100k 1% r44 opt r21 150k r19 150k e9 c28 47uf 6.3v c42 opt r17 opt r27 100k e8 r24 100k 1% e3 c11 opt 1206 r34 opt r7 0 r30 100k c45 0.1uf c12 opt 1206 r33 opt e15 r36 opt2512 r11 19.1k r41 opt2512 tp4 pgood4 r23 100k 1% r29 100k e1 e17 r40 opt jp6 1 2 3 c29 47uf 6.3v 1206 c16 47uf 6.3v 1206 e14 c10 47uf 6.3v 1206 tp5 clkout c36 47uf 6.3v e16 r9 opt LTM4643EV u1 gnd b2 vout1 a1 vout3 f1 vout4 j1 vout2 c1 gnd d3 gnd a4 pgood2 c2 pgood3 f2 pgood4 j2 pgood1 c3 temp f3 clkout j3 intvcc1 c4 intvcc2 f4 intvcc3 j4 intvcc4 k5 track/ss1 a6 mode1 b6 run1 c6 track/ss2 d6 mode2 e6 run2 f6 track/ss4 k6 mode4 l6 run4 k7 fb4 j7 track/ss3 g6 mode3 h6 run3 j6 fb1 a7 comp1 b7 clkin c7 fb2 d7 comp2 e7 sgnd f7 fb3 g7 comp3 h7 comp4 l7 vin1 b3 vin2 e3 vin3 h3 vin4 l3 svin1 b5 svin2 e5 svin3 h5 svin4 l5 gnd a5 gnd b1 vout1 a2 vout1 a3 vin3 h4 vin4 l4 vin2 e4 vin1 b4 vout3 g1 vout3 g2 vout4 k2 vout4 k1 gnd l1 gnd h1 gnd e1 gnd e2 gnd h2 gnd l2 gnd g3 gnd k3 gnd d4 gnd g4 gnd k4 gnd c5 gnd d5 gnd f5 gnd g5 gnd j5 vout2 d2 vout2 d1 e6 r31 100k e13 r4 40.2k c6 1uf c15 opt 1206 c34 opt 1206 c31 opt c17 47uf 6.3v c1 22uf 25v 1206 e5 + c2 33uf 25v r43 opt e12 j1 r37 opt r16 0 c33 opt 1206 r32 opt r3 13.3k r15 0 c35 47uf 6.3v 1206 r22 150k r42 opt + c27 opt c7 opt r2 1 dc2453afb demo manual dc2453a
8 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com ? linear technology corporation 2016 lt 0916 rev b ? 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 european union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other 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 from 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 compliant or agency certified (fcc, ul, ce, etc.). no license is granted under any patent right or other intellectual property whatsoeve r. 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 application engineer. mailing address: linear technology 1630 mccarthy blvd. milpitas, ca 95035 copyright ? 2004, linear technology corporation dc2453afb demo manual dc2453a
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