1 description lt m4649ey high efficiency 10a step-down module regulator demonstration circuit 1856b-b features the lt m ? 4649ey module ? regulator, a high performance high efficiency step-down regulator. the LTM4649EY has an operating input voltage range of 4.5v to 16v and is able to provide an output current of up to 10a. the output voltage is pro - grammable from 0.6v to 3.3v and can be remotely sensed with the internal differential remote sensing amplifier . the ltm4649 ey is a complete dc-dc point of load regulator in a thermally enhanced 15mm 9mm 4.92mm bga package requiring only a few input and output capacitors. l , lt, ltc, ltm, linear technology, module, burst mode and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. boar d p hoto output voltage tracking is available through the track/ss pin for supply rail sequencing. external clock synchroniza - tion is also available through the clkin pin. the ltm4649 data sheet must be read in conjunction with this demo manual for working on or modifying demo cir cuit 1856b-b. design files for this circuit board are available at http://www.linear.com/demo/dc1856b-b p erformance s ummary specifications are at t a = 25c parameter conditions value input voltage range 4.5v to 16v output voltage v out jumper selectable 1v dc , 1.2v dc , 1.5v dc , 1.8v dc , 2.5v dc , 3.3v dc maximum continuous output current derating is necessary for certain operating conditions. see data sheet for details 10a dc default operating frequency 450khz external clock sync. frequency range 250khz to 800khz efficiency v in = 12v, v out = 1.8v, i out = 10a 89% see figure 2 dc1856bbf demo manual dc1856b-b
2 quick s tart p roce d ure demonstration circuit 1856b-b is an easy way to evaluate the performance of the ltm4649 ey. please refer to figure 1 for test setup connections and follow the procedure below. 1. with power off, place the jumpers in the following posi - tions for a typical 1.8v out application: jp8 jp7 jp9 jp2 track/ss run mode v out select ss on ccm 1.8v 2. before connecting input supply, load and meters, preset the input voltage supply to be between 4.5v to 16v. preset the load current to 0a. 3. with power off, connect the load, input voltage supply and meters as shown in figure 1. 4. turn on input power supply . the output voltage meter should display the selected output voltage 2%. 5. once the proper output voltage is established, adjust the load current within the 0a to 10a 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 the mode pin jumper (jp9) in the burst mode ? operation position. to observe increased light load efficiency with a reduced output ripple as compared to burst mode operation, place the mode pin jumper in the pulse- skipping position. 7. for optional load transient testing apply an adjustable positive pulse signal between iostep clk and gnd pins. the pulse amplitude sets the load step current amplitude. the pulse width should be short (< 1ms) and pulse duty cycle should be low (< 15%) to limit the thermal stress on the load transient circuit. the load step current can be monitored with a bnc connected to j5 (10mv/a). dc1856bbf demo manual dc1856b-b
3 quick s tart p roce d ure figure 1. test setup of dc1856b-b load v v in + ? a + + ? ? a + ? v 0a to 10a + ? + ? dc1856bbf demo manual dc1856b-b
4 quick s tart p roce d ure figure 2. measured supply efficiency at 5v in and 12v in 5v in ccm efficiency vs load current 12v in ccm efficiency vs load current load current (a) 0 efficiency % 100 95 90 85 75 80 42 6 7 8 9 dc1856bb f02a 10 31 5 v out = 3.3v at 450khz v out = 2.5v at 450khz v out = 1.8v at 450khz v out = 1.5v at 450khz v out = 1.2v at 450khz v out = 1v at 450khz load current (a) 0 efficiency % 95 90 85 80 70 75 42 6 7 8 9 dc1856bb f02b 10 31 5 v out = 3.3v at 750khz v out = 2.5v at 750khz v out = 1.8v at 450khz v out = 1.5v at 450khz v out = 1.2v at 450khz v out = 1v at 450khz dc1856bbf demo manual dc1856b-b
5 quick s tart p roce d ure figure 3. measured load transient response (5a to 10a load step) figure 4. measured thermal capture v in (v) v out (v) i out (a) airflow ambient (c) 1.2 1.5 10 natural convection 29.7 v in (v) v out (v) c out ceramic 12 1.5 2 220f/4v ceramic dc1856bb f03 i out step : 5a/div v outp : 100mv/div dc1856bbf demo manual dc1856b-b
6 p arts list item qty reference part description manufacturer/part number required circuit components 1 2 co4, co5 cap, 100f, 20%, 6.3v, x5r, 1210 avx, 12106d107mat2a 2 1 co2 cap, 22f, 20%, 6.3v, x5r, 1210 avx, 12106d226mat2a 3 1 cin1 cap, 22f, 20%, 16v, x7r, 1210 murata, grm32er71c226ke18l 4 1 cin3 cap, 150f, 10%, 25v, os-con sun elect, 25hvh150mt 5 2 cin4, cin5 cap, 22f, 20%, 16v, x5r, 1206 taiyo yuden, emk316bj226ml-t 6 2 r22, r23 res, 10, 5%, 1/10w, 0603 vishay, crcw060310r0jnea 7 1 r19 res, 15k, 1%, 1/10w, 0603 vishay, crcw060315k0fkea 8 1 c1 cap, 0.1f, 20%, 25v, x7r, 0603 avx, 06033c104mat2a 9 1 c3 cap, 2.2f, 20%, 10v, x5r, 0603 taiyo yuden, lmk107bj225ma-t 10 1 u1 ic, power module linear technology, LTM4649EY additional demo board circuit components 1 0 co7 cap, option, 7343 option 2 0 co1, co3, co6 cap, option,1210 option 3 1 c2 cap, 1f, 20%, 10v, x5r, 0603 taiyo yuden, lmk107bj105ma-t 4 0 c4, c5, cthp, cp, cff cap, option, 0603 option 5 1 r11 res, 0.01, 5%, 1w, 2512 panasonic, erj-m1wsf10mu 6 3 r10, r14, rs res, 10k, 1%, 1/10w, 0603 vishay, crcw060310k0fkea 7 1 r16 res, 20k, 5%, 1/10w, 0603 vishay, crcw060320k0jnea 8 2 r17, r18 res, 51, 5%, 1/10w, 0603 vishay, crcw060351r0jnea 9 1 r15 res, option, 0603 option 10 1 r1 res, 4.99k, 1%, 1/10w, 0603 vishay, crcw06034k99fkea 11 1 r2 res, 6.65k, 1%, 1/10w, 0603 vishay, crcw06036k65fkea 12 1 r3 res, 3.16k, 1%, 1/10w, 0603 vishay, crcw06033k16fkea 13 1 r4 res, 2.21k, 1%, 1/10w, 0603 vishay, crcw06032k21fkea 14 0 r5, r7, r8, r9, r12, r13, r20, r21, r24 res, option, 0603 option 15 2 r6, r25 res, 0, jumper, 0603 vishay, crcw06030000z0ea 16 1 q14 xstr, mosfet, n-channel, 30v vishay, sud50n04-8m8p-4ge3 hardware 1 10 e1 to e10 testpoint, turret 0.094" mill max, 2501-2-00-80-00-00-07-0 2 6 jp1, jp2, jp3, jp4, jp5, jp6 header, 2pin, 2mm sullin, nrpn021paen-rc 3 2 jp7, jp8 header, 3pin, 2mm sullin, nrpn031paen-rc 4 1 jp9 header, 3x2 2mm sullin, nrpn032paen-rc 5 4 j1, j2, j3, j4 jack, banana keystone, 575-4 6 2 j5, j6 conn, bnc, 5 pins connex, 112404 7 4 xjp1, xjp7, xjp8, xjp9 shunt, 2mm samtec, 2sn-bk-g 8 4 standoff, snap on keystone_8834 dc1856bbf demo manual dc1856b-b
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 note: unless otherwise specified vin+ 1. all resistors and capacitors are 0603. vout run 1 2.5v vout sel on off 2 1 3 2 track ss track/ss dynamic load circuit 3 3.3v 1 1 2 1 1 2 2 1.5v light load 2 1 2 1.8v ccm pulse skip burst vout sel iostep vin- ** vout adj. gnd 10a max 1.2v m 1 2 1v assy -b ltm4648ey LTM4649EY -a u1 ** 2.375v - 5.5v 4.5v - 16v vin 1206 1210 1206 1210 1210 1210 1210 1210 1210 sanyo sanyo 100k opt r15 vout vin vo- vo+ volcl volcl vo+ vo- intvcc intvcc intvcc intvcc vin vin vin intvcc revision history description date approved eco rev sy rebuild with change 1 08-24-15 __ revision history description date approved eco rev sy rebuild with change 1 08-24-15 __ revision history description date approved eco rev sy rebuild with change 1 08-24-15 __ 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 monday, august 24, 2015 11 high efficiency, 10a step-down module regulator lt sy n/a ltm4648ey / LTM4649EY demo circuit 1856b 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 monday, august 24, 2015 11 high efficiency, 10a step-down module regulator lt sy n/a ltm4648ey / LTM4649EY demo circuit 1856b 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 monday, august 24, 2015 11 high efficiency, 10a step-down module regulator lt sy n/a ltm4648ey / LTM4649EY demo circuit 1856b r16 20k q14 sud50n03 1 2 3 r11 0.01 2512 e5 track r23 10 e3 vo- co1 opt r18 51 r20 opt r19 15k 1% r15 ** cthp opt r14 10k 1% r1 4.99k 1% cin5 22uf 16v c5 opt r17 51 e10 temp jp6 jp3 cff opt r24 opt r21 opt co5 100uf 6.3v jp9 1 2 3 4 5 6 e1 vin r13 opt r5 opt r7 opt jp4 rs 10k 1% r4 2.21k 1% e9 pgood cin4 22uf 16v + cin3 150uf 25v + co7 opt 7343 j5 1 2 3 4 5 sw r6 0 r22 10 jp7 r25 0 c1 0.1uf c2 1uf co3 opt j1 co6 opt co4 100uf 6.3v r12 opt e6 clkin jp2 j2 r9 opt cin1 22uf 16v e8 gnd co2 22uf 6.3v j3 jp5 cp opt e4 vo+ r10 10k 1% e7 iostep clk c4 opt r8 opt j6 1 2 3 4 5 jp1 r2 6.65k 1% c3 2.2uf jp8 r3 3.16k 1% u1 ** vin c1 vin c8 vin c9 vin d1 vin d3 vin d4 vin d5 vin d7 vin d8 vin d9 nc c4 gnd a1 gnd a2 gnd a3 gnd a4 gnd a5 temp a6 gnd a7 gnd a8 gnd a9 gnd a10 gnd a11 gnd b1 gnd b9 gnd b10 gnd b11 gnd f3 diffn f7 diffp f8 gnd g1 gnd g2 gnd g3 gnd g4 gnd g5 gnd g6 diffout g8 gnd g7 ith f6 gnd f5 sw c5 fb e7 clkout f2 intvcc f4 track/ss e5 freq e3 vout g11 vout g10 volcl g9 vout f11 vout f10 vout f9 vout e11 vout e10 vout e9 vout d11 vout c11 vout c10 vin e8 vout d10 clkin b3 phmode b4 mode b5 nc b7 nc b8 nc c3 pgood c7 run f1 gnd e1 e2 gnd j4 dc1856bbf demo manual dc1856b-b
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 0216 ? 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 dc1856bbf demo manual dc1856b-b
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