general description the max1909 evaluation kit (ev kit) is an accurate and efficient multichemistry battery charger. the ev kit can charge three or four series li+ cells with a current up to 3a. charge current and input-source current are adjustable using on-board potentiometers. the output voltage is set to 4.2v ? the number of series cells in the battery pack. the number of series cells is jumper- selectable. the output voltage is adjustable between 4v to 4.4v ( ? number of series cells) by installing two resistors. the ev kit provides outputs to monitor the ac adapter current and the presence of an ac adapter. the max1909 automatically selects the power path for supplying power to the system by controlling two exter- nal p-channel mosfets. this decision is made based on the presence of an ac adapter. features input current limiting 0.5% output voltage accuracy using internal reference automatic selection of system power source analog inputs control charge current and charge voltage monitor outputs for ac adapter current ac adapter presence up to 17.6v battery voltage +8v to +25v input voltage up to 3a battery charge current charges li+, nicd, and nimh battery chemistries surface-mount construction fully assembled and tested quick start required equipment before beginning, the following equipment is required: ? dc source to supply the input current to the charger. this source must be capable of supplying a voltage greater than the battery-voltage set point and have sufficient current rating. ? voltmeter ? battery pack or load procedure the max1909 ev kit is a fully assembled and tested surface-mount board. follow the steps below to verify board operation. do not turn on the power supply until all connections are completed. observe all pre- cautions on the battery manufacturer? data sheet: 1) set jumper ju1 to indicate the number of cells in the battery pack (table 1). 2) remove the shunt on ju2 to disable the max1909. 3) the battery regulation voltage is set to 4.2v per cell. if a different voltage is required, see the battery regulation voltage section. 4) the charge current is set to 3a. if a different current is required, see the charging current limit section. evaluates: max1909 max1909 evaluation kit ________________________________________________________________ maxim integrated products 1 component list 19-2981; rev 0; 9/03 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ordering information part temp range ic package MAX1909EVKIT 0? to +70? 28 thin qfn designation qty description c1, c2 2 10f 20%, 25v x5r ceramic capacitors (1812) taiyo yuden tmk432bj106km tdk c4532x5r1e106m c3 0 not installed (2220) c4 1 22f 20%, 25v ceramic capacitor (2220) tdk c5750x5r1e226m c5, c6 0 not installed, e-size capacitors c7, c9, c12, c17, c18 5 0.1f 10%, 25v x7r ceramic capacitors (0603) murata grm188r71e104k tdk c1608x7r1e104k c8, c13, c14, c15 0 not installed, capacitors (0603) c10, c11, c21 3 1f 10%, 6.3v x5r ceramic capacitors (0603) murata grm188r60j105k taiyo yuden jmk107bj105ka tdk c1608x5r1a105k c16 1 1f 10%, 25v x7r ceramic capacitor (1206) murata grm31mr71e105k taiyo yuden tmk316bj105kl tdk c3216x7r1e105k c19, c20 2 0.01f 10%, 50v x7r ceramic capacitors (0603) murata grm188r71h103k taiyo yuden umk107b103kz tdk c1608x7r1h103k
evaluates: max1909 max1909 evaluation kit 2 _______________________________________________________________________________________ supplier phone fax website avx 843-946-0238 843-626-3123 www.avxcorp.com diodes inc. 805-446-4800 805-381-3899 www.diodes.com fairchild semiconductor 888-522-5372 www.fairchildsemi.com general semiconductor 760-804-9258 760-804-9259 www.gensemi.com international resistive co. 361-992-7900 361-992-3377 www.irctt.com kemet 864-963-6300 864-963-6322 www.kemet.com murata 770-436-1300 770-436-3030 www.murata.com on semiconductor 602-244-6600 602-244-4545 www.onsemi.com sumida 847-545-6700 847-545-6720 www.sumida.com taiyo yuden 800-348-2496 847-925-0899 www.t-yuden.com tdk 847-803-6100 847-390-4405 www.component.tdk.com toko 847-297-0070 847-699-1194 www.tokoam.com vishay dale 402-564-3131 402-563-6296 www.vishay.com component suppliers component list (continued) designation qty description c22 1 2.2f 20%, 35v tantalum capacitor (b-size) avx tajb225m035 kemet t491b225m035as d1 1 schottky diode, 0.5a, 30v sod-123 diodes inc. b0530w general semiconductor mbr0530 on semiconductor mbr0530 d2 0 not installed j1 1 smart-battery header assembly, right angle, keyless, five position tyco electronics (amp) 787441-1 ju1, ju2 2 2-pin headers ju3 0 not installed l1 1 10h, 4.4a inductor sumida cdrh104r-100nc toko 919as-100m n1 1 single, n-channel, 8.4a, 30v, 8-pin so mosfet fairchild fds6612a p1 1 single, p-channel, -5.3a, -30v, 8-pin so mosfet fairchild fds9435a designation qty description p2, p3, p4 3 single, p-channel, -11a, -30v, 8-pin so mosfets fairchild fds6675 r1 1 0.01 ? 1%, 0.5w sense r esi stor ( 2010) vishay dale wsl2010 0.010 1.0% irc lrc-lr2010-01-r010-f r2 1 0.015 ? 1%, 0.5w sense resistor (2010) vishay dale wsl2010 0.015 1.0% irc lrc-lr2010-01-r015-f r3, r4, r8, r13, r14, r15, r17 r23 0 not installed, resistors (0603) r5 1 590k ? 1% resistor (0603) r6 1 196k ? 1% resistor (0603) r7, r12 2 50k ? potentiometers (multiturn) r9, r10, r11 3 10k ? 5% resistors (0603) r16 1 33 ? 5% resistor (0603) r24 1 10 ? 5% resistor (0603) u1 1 max1909eti (28-pin thin qfn-ep) note: please indicate you are using the max1909 when contacting these manufacturers.
evaluates: max1909 max1909 evaluation kit _______________________________________________________________________________________ 3 5) the source current is set to 5a. if a different current is required, see the source current limit section. 6) connect the input current supply across the adapter_in and pgnd pads. 7) connect a battery pack or load between the batt+ and batt- pads. 8) turn on the power supply. 9) enable the max1909 by installing the shunt on ju2. 10) verify current is being delivered to the battery. detailed description the max1909 includes all the functions necessary to charge li+ batteries. the ev kit is shipped with a charge current of 3a and a battery regulation voltage of 4.2v x the number of cells in the battery pack. the max1909 includes a battery-conditioning feature, which allows for the relearning of the battery pack capacity. for more information on the operation of the max1909, refer to the detailed description section of the max1909 data sheet. jumper ju1 jumper ju1 selects the number of series cells to be charged. see table 1 for jumper settings. jumper ju2 jumper ju2 controls the pack-presence pkpres pin. a shunt on ju2 enables the max1909. removing the shunt places the max1909 in shutdown mode. if the battery pack used with the max1909 ev kit has a thermistor, remove the shunt on ju2 and connect the thermistor to the thrm pad. jumper ju3 jumper ju3 connects vctl to ldo. this sets the bat- tery regulation voltage to 4.2v x the number of cells. the battery regulation voltage can be set between 4.0v and 4.4v (x the number of cells) by cutting the short across ju3 and installing resistors at r3 and r4. see the battery regulation voltage section for more information. battery regulation voltage the default battery regulation voltage on the max1909 ev kit is 4.2v x the number of cells. to set it to a value between 4.0v and 4.4v (x the number of cells), remove the shunt on ju1 and install resistors at r3 and r4. use the following equation to calculate the resistor values: v batt is the desired battery regulation voltage and cells is the number of cells selected by jumper ju1. choose 1% resistors with a total resistance less than 250k ? to minimize error caused by bias current. for v batt / cells = 4, use 100k ? for r4 and leave r3 uninstalled. for v batt / cells = 4.4, use 100k ? for r4 and 49.9k ? for r3. charging current limit (potentiometer r7) the default charging current limit on the max1909 ev kit is 3a. to set it to a value between 0.156a and 5a, adjust potentiometer r7. refer to the setting the charging current limit section of the max1909 data sheet for more information. note: 5a charging current requires a different inductor. source current limit (potentiometer r12) potentiometer r12 is connected to cls, the source cur- rent-limit input. adjusting r12 allows the input current limit to be set between 3.75a and 7.5a. refer to the setting the input current limit section of the max1909 data sheet for more information. rr v cells batt 34 54 9 523 4 223 1 8 1 = ? ? ? ? ? ? ? + ? ? ? ? ? ? ? ? ? ? ? ? ? . ... jumper jumper position function closed* mode = ldo. cell count = 4. ju1 open mode = float. cell count = 3. closed* pkpres = gnd. max1909 enabled. ju2 open pkpres connected to ldo through 10k ? pullup resistor. the max1909 is disabled unless the battery thermistor is connected to thrm. c l osed * ( shor ted b y p c tr ace) vctl = ldo. battery regulation voltage set to 4.2v x the number of cells. ju3 open battery regulation voltage can be set between 4v and 4.4v x the number of cells. resistors r3 and r4 must be installed. table 1. jumper selection * default position.
evaluates: max1909 max1909 evaluation kit 4 _______________________________________________________________________________________ gnd smart battery connector batt+ j1-10 j1-5 j1-4 j1-9 scl sda j1-3 j1-8 j1-2 j1-7 thm thm batt- j1-1 j1-6 iinp thrm acok mode r3 open r4 open r8 open thm r9 10k ? ldo ju2 r10 10k ? c17 0.1 f r11 10k ? c18 0.1 f r22 short pc trace r23 short pc trace c19 0.01 f c20 0.01 f c21 1 f ref ldo ldo ju1 ref 3 2 r7 50k ? 1 r6 196k ? 1% ju3 short ldo r5 590k ? 1% r24 10 ? d1 c16 1 f d2 open c22 2.2 f 5 6 7 8 2 3 1 1 2 3 7 8 5 6 p3 4 4 p4 src c6 open c5 open adapter_in pgnd r13 short pc trace c7 0.1 f r1 0.01 ? 1% r14 short pc trace c8 open r15 short pc trace c9 0.1 f src c12 0.1 f r21 short pc trace ldo c10 1 f r16 33 ? c11 1 f r17 short pc trace r18 short pc trace r20 short pc trace r19 short pc trace c15 open c13 open c14 open r2 0.015 ? 1% l1 10 h 2 1 3 n1 6 5 4 8 7 6 7 8 5 p1 2 3 1 4 8 7 5 6 p2 4 1 2 3 load c1 10 f c2 10 f c3 open c4 22 f batt- batt+ cls 2 r12 50k ? 3 1 15 9 4 14 12 13 ccv cci ccs ref cls gnd iinp pkpres acok mode ictl vctl acin dcin src pds cssp cssn dhiv pdl ldo dlov dhi dlo pgnd csip csin 8 5 6 7 10 11 3 24 1 u1 27 26 25 22 28 2 21 23 20 19 18 17 16 batt max1909 figure 1. max1909 ev kit schematic
evaluates: max1909 max1909 evaluation kit _______________________________________________________________________________________ 5 figure 4. max1909 ev kit pc board layout?ignal and ground layer figure 5. max1909 ev kit pc board layout?round layer figure 2. max1909 ev kit component placement guide component side figure 3. max1909 ev kit pc board layout?omponent side
evaluates: max1909 max1909 evaluation kit maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 6 _____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2003 maxim integrated products printed usa is a registered trademark of maxim integrated products. figure 7. max1909 ev kit component placement guide solder side figure 6. max1909 ev kit pc board layout?older side
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