1 description ltc 4020euhf high power buck-boost multi-chemistry battery charger demonstration circuit 2134a is a high power buck-boost multichemistry battery charger featuring the lt c ? 4020. the board will accept an input voltage between 15v and 55v. the float voltage of the battery output ( bat ) is 25.2v, with 6.3a maximum charge current. the converter output (v out ) has a voltage range of 21v to 28v, with 8a maxi - mum load current. the ltc4020 contains a high efficiency synchronous buck-boost dc/dc controller, and uses a proprietary average current mode architecture. the ltc4020 battery charger can provide a constant- current/constant-voltage charge algorithm (jp1: cc/cv, l , lt, ltc, ltm, 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 with mode pin grounded ), constant - current charging ( jp 1: cc, with mode pin floated), or charging with an optimized 4-step, 3-stage lead-acid battery charge profile (jp1: lead- acid, with mode pin connected to intv cc ). the ltc4020 data sheet gives a complete description of the ic operation and application information. the data sheet must be read in conjunction with this quick start guide. design files for this circuit board are available at http://www .linear.com/demo/dc2134a specifications are at t a = 25c parameter condition value input voltage range 15v to 55v battery float voltage ( bat ) (nominal) i bat = 0a 25.2v converter output voltage (v out ) i out = 0a to 8a 21v to 28v maximum battery charge current, i bat i out = 0a 6.3a maximum converter output current, i out i bat = 0a 8a typical efficiency v in = 24v, v out = 25.2v, i out = 8a 98.1% typical converter output ripple v in = 55v, v out = 25.2v, i out = 8a (20mhz bandwidth) 109mv pCp dc2134af demo manual dc2134a
2 quick start procedure demonstration circuit 2134a is easy to set up to evaluate the performance of the ltc4020. refer to figure 1 for the proper measurement equipment setup and follow the procedure below: 1. with power off, connect the input power supply (set for 0v) to v in and gnd (input return). 2. connect the converter output load between vout and gnd (initial load: no load). 3. connect the dvms to the input and outputs. 4. turn on the input power supply and slowly increase to 24v. check for the proper output voltages, v out of 25.2v and bat of 25.2v. 5. once the proper output voltages are established, adjust the converter output load within the operating range (8a maximum) and/ or adjust input voltage (15v to 55v ), and observe the output voltage regulation, ripple voltage, efficiency and other parameters. note: when measuring the output or input voltage rip- ple, do not use the long ground lead on the oscilloscope probe. see figure 2 for the proper scope probe technique. short, stiff leads need to be soldered to the (+) and (C) terminals of an output capacitor. the probes ground ring needs to touch the (C) lead and the probe tip needs to touch the (+) lead. additional notes: 1. caution: be careful when testing with high voltage. high voltage can result in an electric shock if care is not taken. 2. caution: batteries are potentially dangerous high energy sources. improper connection, overcharge, or rapid discharge could result in explosion and/or file. please read the specification/manual of the battery before test. 3. the combined converter output load current and bat - tery charging current should not exceed 8a. 4. without a proper battery , bat output can be open or connected with other suitable loads for test purposes. it may be a good practice to add low esr electrolytic capacitors to the bat output (1000f at 35v, for 25.2v float voltage). note: these capacitors help simulate the low impedance of a battery and maintain stability of the charge current loop. its only needed for test purposes with electronic or resistive loads, and not needed in the actual battery application/test (where the bat load is a battery). 5. bat float voltage can be easily adjusted with the resis - tor divider r8/r10. converter output voltage v out can be adjusted with the resistor divider r9/r11. adjust/ optimize the loop compensations if necessary. dc2134af demo manual dc2134a
3 quick start procedure figure 1. proper measurement equipment setup figure 2. measuring output voltage ripple + ? v out gnd c out dc2134af demo manual dc2134a
4 quick start procedure load current (a) 0.1 efficiency (%) 100 95 40 35 90 30 55 50 45 60 65 80 85 75 70 dc2134a f03 10 1 15v in , 25.2v out 24v in , 25.2v out 55v in , 25.2v out v in (v) 14 18 22 26 30 34 38 16 20 24 28 32 36 40 42 efficiency (%) 99.0 98.5 93.0 92.5 98.0 92.0 94.5 94.0 93.5 95.0 95.5 97.0 97.5 96.5 96.0 dc2134a f04 56 46 44 48 52 50 54 25.2v out , 8a figure 3. efficiency vs load current (v out = 25.2v) figure 4. efficiency vs input voltage (v out = 25.2v, i out = 8a) dc2134af demo manual dc2134a
5 parts list item qty reference part description manufacturer / part number required circuit components 1 1 c1 cap, chip, x7s, 0.1f, 10%, 100v, 0603 tdk, c1608x7s2a104k 2 2 c2,c3 cap, elec., 56f, 20%, 63v, 10x12.5 suncon, 63hvh56m 3 1 c4 cap, chip, c0g, 100pf, 10%, 16v, 0402 avx , 0402ya 101 kat 9a 4 1 c6 cap., mlcc, 6800pf, 50v,10%, 0603 avx ,esd35c682k4t2a-18 5 1 c8 cap, chip, c0g, 47pf, 10%, 50v, 0603 avx ., 06035a470 kat 2a 6 1 c11 cap, chip, x5r, 4.7f, 10%, 6.3v, 0603 avx , 06036d475 kat 2a 7 1 c12 cap, chip, x7r, 0.033f, 10%, 25v, 0402 tdk, c1005x7r1e333k 8 4 c14, c18, c27, c28 cap, chip, x5r, 10f, 20%, 35v, 1210 avx , 1210dd106 mat 2a 9 2 c15, c17 cap, elec., 220f, 20%, 35v 10x12.5 suncon, 35hvh220m 10 2 c16, c23 cap, chip, x7s, 4.7f, 20%, 100v, 1210 tdk,c3225x7s2a475m 11 3 c5, c19, c20 cap, chip, x5r,0.22f, 10%, 25v, 0603 avx , 06033d224 kat 2a 12 1 c21 cap, chip, x5r, 10f, 20%, 6.3v, 0805 avx ., 08056d106 kat 2a 13 2 c39, c40 cap, chip, x7r,0.22f, 20%, 10v, 0603 avx , 0603zc224 mat 2a 14 2 d1, d2 diode, smt, superbarrier, 60v, 0.5a, sod123 diodes inc., sbr0560s1-7 15 1 d3 diode, led, red, smt, 0603 w rth , 150060ss75000 16 1 d4 diode, led, green, 0603 w rth , 150060vs75000 17 1 d6 diode., smt schottky barrier rectifier, sma vishay , b360a-e3 18 1 l1 ind, smt, 5.6h w rth , 7443556560 19 1 m1 p-channel mosfet, C30v powerpaks08 vishay , si7145dp-t1-ge3 20 2 m2, m4 n-channel mosfet, 60v, powerpaks08 vishay , sir664dp-t1-ge3 21 2 m3, m7 n-channel mosfet, 40v, powerpaks08 vishay , sir422dp-t1-e3 22 1 rcbat 1 res, chip, 0.008, 1%, 1w, 2512 vishay , wsl25128l000fea 23 2 rcbrb1, rcbrt1 res, chip, 0.002, 1%, 1w, 2512 vishay , wsl25122l000fea 24 2 r1, r13 res, chip, 100k, 5%, 0402 vishay , crcw0402100kjned 25 1 r2 res, chip, 510k, 5%, 0402 vishay , crcw0402510kjned 26 1 r4 res, chip, 51k, 1%, 0402 vishay , crcw040251k0fked 27 3 r6, r7, r19 res, chip, 20, 5%, 0402 vishay , crcw040220r0jned 28 1 r8 res, chip, 226k, 0.1%, 0603 vishay , tnpw06030f226beea 29 1 r9 res, chip, 226k, 1%, 0603 vishay , crcw0603226kfkea 30 1 r10 res, chip, 24.9k, 0.1%, 0402 vishay , tnpw04020f24k9beed 31 1 r11 res, chip, 24.9k, 1%, 0402 vishay , crcw040224k9fked 32 1 r14 res, chip, 10k, 1%, 0402 vishay , crcw040210k0fked 33 1 r15 res, chip, 36k, 1%, 0603 vishay , crcw060336k0fkea 34 1 r16 res, chip, 47k, 1%, 0603 vishay , crcw060347k0fkea 35 2 r18, r20 res, chip, 100, 5%, 0402 vishay , crcw0402100rjned 36 2 r26, r27 res, chip, 3k, 5%, 0402 vishay , crcw04023k00jned 37 1 u1 ic, LTC4020EUHF, 5mm 7mm qfn-38 linear tech., LTC4020EUHF dc2134af demo manual dc2134a
6 parts list item qty reference part description manufacturer / part number additional demo board circuit components 1 0 c13, c7, c9, c10, c30, c31 ( opt ) cap, chip, opt 0603 opt 2 0 c22, c24, c25 ( opt ) cap, chip, opt 0402 opt 3 0 c26, c29, c32-c38 ( opt ) cap, chip, opt 1210 opt 4 0 d5 ( opt ) diode, opt sma opt 5 0 d7 ( opt ) diode, opt sod123 opt 6 0 m5, m6, m8, m9 ( opt ) n-channel mosfet, opt powerpaks08 opt 7 0 r3 ( opt ) res, opt 0402 opt 8 8 r21-25, r34, r35, r37 res, chip, 0 jumper, 0402 vishay , crcw04020000z0ed 9 0 r17, r31, r32 ( opt ) res, opt 0603 opt 10 1 r36 res, chip, 0 jumper, 0603 vishay , crcw06030000z0ea 11 1 r38 res, chip, 5.1, 5%, 0805 vishay ,crcw08055r10jnea hardware: for demo board only 1 8 e1, e2, e5, e9, e10, e13, e14, e17 turret, 0.09" dia mill-max, 2501-2-00-80-00-00-07-0 2 6 e3, e4, e11, e12, e15, e16 vertical banana jack, 575-4 keystone, 575-4 3 1 jp1 header, hd2x3-079 w rth , 62000311121 4 1 xjp1 shunt, .079" center w rth , 60800213421 5 4 stand -off, nylon (snap on), 0.375" tall keystone, 8832 (snap on) dc2134af demo manual dc2134a
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. schematic diagram 5 5 4 4 3 3 2 2 1 1 d d c c b b a a 15v - 55v vin 63v 63hvh56m 63v 63hvh56m 21v - 28v vout gnd gnd bat 6.3a max 25.2v float 25v 25v 16v 1w 6.3v 35hvh220m 35v 35hvh220m 35v 1w 1w 100v ntc shdn gnd ?????????? ? 100v 35v 35v 35v 35v sgnd 8a max ???????????????????????????????? ???????????????????????????????????? ????????????????????????????????????????????? mode cc/cv cc lead-acid wurth 7443556560 gnd vout gnd bat vin 0.1% 0.1% 1% 1% vbat vout vout vbat int_vcc int_vcc ???????????????? ??????????? ???? ???????? ??? ??? ?????????? ??????? ?? ???????????????? ??????????? ???? ???????? ??? ??? ?????????? ??????? ?? ???????????????? ??????????? ???? ???????? ??? ??? ?????????? ??????? ?? ???? ????? ?????? ???? ????? ?? ?????? ????????? ???????? ???????? technology ?????????????????? ?????????????????? ???????????????????? ??????????????????? ?????????????????????????????????????? ??????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ?????????????????????????????????????????????????? ???????????????????????????????????????????????? ????????????????????????????????????????????????????? ??????????????????????????????????????????? ??????????????????????????????????????????????????? ???????????????????????????????????????????????????? ????????? ?????????????????????????????????????????????? ???????????? ?????????????? ? ???????????????????????? ? ??????????????????????? ?????????? ??? ??????????????????????????????? ???? ????? ?????? ???? ????? ?? ?????? ????????? ???????? ???????? technology ?????????????????? ?????????????????? ???????????????????? ??????????????????? ?????????????????????????????????????? ??????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ?????????????????????????????????????????????????? ???????????????????????????????????????????????? ????????????????????????????????????????????????????? ??????????????????????????????????????????? ??????????????????????????????????????????????????? ???????????????????????????????????????????????????? ????????? ?????????????????????????????????????????????? ???????????? ?????????????? ? ???????????????????????? ? ??????????????????????? ?????????? ??? ??????????????????????????????? ???? ????? ?????? ???? ????? ?? ?????? ????????? ???????? ???????? technology ?????????????????? ?????????????????? ???????????????????? ??????????????????? ?????????????????????????????????????? ??????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ?????????????????????????????????????????????????? ???????????????????????????????????????????????? ????????????????????????????????????????????????????? ??????????????????????????????????????????? ??????????????????????????????????????????????????? ???????????????????????????????????????????????????? ????????? ?????????????????????????????????????????????? ???????????? ?????????????? ? ???????????????????????? ? ??????????????????????? ?????????? ??? ??????????????????????????????? ???? ????? ?????? ???? ????? ?? ?????? ????????? ???????? ???????? technology ?????????????????? ?????????????????? ???????????????????? ??????????????????? ?????????????????????????????????????? ??????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ?????????????????????????????????????????????????? ???????????????????????????????????????????????? ????????????????????????????????????????????????????? ??????????????????????????????????????????? ??????????????????????????????????????????????????? ???????????????????????????????????????????????????? ????????? ?????????????????????????????????????????????? ???????????? ?????????????? ???????????????????????? ?? ?? ??? ??????????? ?????????????????? ???? ????? ?????? ???? ????? ?? ?????? ????????? ???????? ???????? technology ?????????????????? ?????????????????? ???????????????????? ??????????????????? ?????????????????????????????????????? ??????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ?????????????????????????????????????????????????? ???????????????????????????????????????????????? ????????????????????????????????????????????????????? ??????????????????????????????????????????? ??????????????????????????????????????????????????? ???????????????????????????????????????????????????? ????????? ?????????????????????????????????????????????? ???????????? ?????????????? ???????????????????????? ?? ?? ??? ??????????? ?????????????????? ???? ????? ?????? ???? ????? ?? ?????? ????????? ???????? ???????? technology ?????????????????? ?????????????????? ???????????????????? ??????????????????? ?????????????????????????????????????? ??????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ?????????????????????????????????????????????????? ???????????????????????????????????????????????? ????????????????????????????????????????????????????? ??????????????????????????????????????????? ??????????????????????????????????????????????????? ???????????????????????????????????????????????????? ????????? ?????????????????????????????????????????????? ???????????? ?????????????? ???????????????????????? ?? ?? ??? ??????????? ?????????????????? c22 opt c22 opt rcbat1 0.008 2512 rcbat1 0.008 2512 m8 opt m8 opt 4 1 5 6 7 8 2 3 m4 sir664dp m4 sir664dp 4 1 5 6 7 8 2 3 m2 sir664dp m2 sir664dp 4 1 5 6 7 8 2 3 e13 e13 rcbrt1 0.002 2512 rcbrt1 0.002 2512 r22 0 r22 0 rcbrb1 0.002 2512 rcbrb1 0.002 2512 m7 sir422dp m7 sir422dp 4 1 5 6 7 8 2 3 m9 opt m9 opt 4 1 5 6 7 8 2 3 d5 opt d5 opt c25 opt c25 opt r16 47k 0603 r16 47k 0603 r13 100k r13 100k e9 e9 r26 3k r26 3k r10 24.9k r10 24.9k c4 100pf c4 100pf d1 sbr0560s1 d1 sbr0560s1 c34 c34 r14 10k r14 10k m1 si7145dp m1 si7145dp 4 1 5 6 7 8 2 3 c16 4.7uf 1210 c16 4.7uf 1210 c10 opt 0603 c10 opt 0603 e1 e1 c37 c37 r20 100 r20 100 d3 red d3 red e4 e4 c13 opt 0603 c13 opt 0603 r9 226k 0603 r9 226k 0603 e16 e16 c21 10uf 0805 c21 10uf 0805 r35 0 r35 0 c32 c32 c39 0.22uf 0603 c39 0.22uf 0603 u1 LTC4020EUHF u1 LTC4020EUHF ilimit 25 vfbmax 26 bat 20 stat1 12 stat2 13 rng/ss 15 bg1 37 sgnd 29 pgnd 35 sgnd 39 bg2 33 tg2 31 bst2 30 sw1 38 tg1 1 bst1 2 int_vcc 34 fbg 18 sensgnd 4 vfbmin 19 csout 24 ith 27 timer 14 rt 8 csn 22 sgnd 3 shdn 9 vin_reg 10 sensvin 7 senstop 6 csp 23 bgate 21 pvin 36 sensbot 5 ntc 16 mode 11 vc 28 sw2 32 vfb 17 c5 0.22uf 0603 c5 0.22uf 0603 r6 20 r6 20 c11 4.7uf 6.3v 0603 c11 4.7uf 6.3v 0603 d7 opt d7 opt r25 0 r25 0 r37 0 r37 0 e3 e3 c9 opt 0603 c9 opt 0603 c40 0.22uf 0603 c40 0.22uf 0603 c14 10uf 1210 c14 10uf 1210 + c2 56uf + c2 56uf r18 100 r18 100 r2 510k r2 510k r19 20 r19 20 e12 e12 c7 opt 0603 c7 opt 0603 e2 e2 m5 opt m5 opt 4 1 5 6 7 8 2 3 c27 10uf 1210 c27 10uf 1210 r34 0 r34 0 d2 sbr0560s1 d2 sbr0560s1 r27 3k r27 3k e14 e14 r38 5.1 0805 r38 5.1 0805 c29 opt 1210 c29 opt 1210 c38 c38 c30 opt 0603 c30 opt 0603 r32 opt 0603 r32 opt 0603 r3 opt r3 opt c23 4.7uf 1210 c23 4.7uf 1210 c28 10uf 1210 c28 10uf 1210 r15 36k 0603 r15 36k 0603 r11 24.9k r11 24.9k c24 opt c24 opt r24 0 r24 0 jp1 jp1 1 3 5 6 4 2 c31 opt 0603 c31 opt 0603 d4 grn d4 grn c1 0.1uf 0603 c1 0.1uf 0603 r17 opt 0603 r17 opt 0603 + c17 220uf + c17 220uf + c15 220uf + c15 220uf r21 0 r21 0 + c3 56uf + c3 56uf e10 e10 m3 sir422dp m3 sir422dp 4 1 5 6 7 8 2 3 c36 c36 r8 226k 0603 r8 226k 0603 c33 c33 c8 47pf 0603 c8 47pf 0603 e11 e11 r36 0 0603 r36 0 0603 r7 20 r7 20 r1 100k r1 100k c19 0.22uf 0603 c19 0.22uf 0603 c35 opt 1210 c35 opt 1210 l1 5.6uh l1 5.6uh d6 b360a d6 b360a c18 10uf 1210 c18 10uf 1210 e5 e5 r23 0 r23 0 e15 e15 e17 e17 r4 51k r4 51k r31 opt 0603 r31 opt 0603 c26 opt 1210 c26 opt 1210 c12 0.033uf c12 0.033uf c6 6.8nf 0603 c6 6.8nf 0603 m6 opt m6 opt 4 1 5 6 7 8 2 3 c20 0.22uf 0603 c20 0.22uf 0603 dc2134af demo manual dc2134a
8 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com ? linear technology corporation 2014 lt 0414 ? printed in usa demonstration board important notice linear technology corporation ( lt c ) 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 lt c 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 lt c from all claims arising from the handling or use of the goods. due to the open construction of the product, it is the user s 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 whatsoever . lt c assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. lt c 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 lt c applica- tion engineer . mailing address: linear technology 1630 mccarthy blvd. milpitas, ca 95035 copyright ? 2004, linear technology corporation dc2134af demo manual dc2134a
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