general description the max1649 evaluation kit (ev kit) provides a regulat-ed 5v output voltage from a 5.5v to 16.5v source. the circuit is configured to deliver up to 1.5a of output cur- rent using all surface-mount components. the max1649? low quiescent current and unique current- limited pfm control scheme provide high efficiency over a wide range of load currents. the max1649 ev kit can also be used to evaluate the max1651 (3.3v output), max649, max651, and max652. however, the max1649/max1651 are improved versions of the max649/max651, and are recommended for new designs. features ? + 5.5v to +16.5v input supply range ? over 90% efficiency for 10ma to 1.5a loads ? 100 a (max) quiescent supply current ? fixed 5v or optional adjustable output voltage ? 1.5a output current capability ? fully assembled and tested evaluates: max649/max651/max652/max1649/max1651 max1649 evaluation kit ________________________________________________________________ maxim integrated products 1 19-1293; rev 1; 11/07 component suppliers component list ordering information for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642,or visit maxim? website at www.maxim-ic.com. _________________________quick start the max1649 ev kit is fully assembled and tested.follow the steps below to verify board operation. do not turn on the power supply until all connectionsare completed. 1) connect a +5.5v to +16.5v power supply to the pad marked vin. 2) connect ground to the gnd pad. 3) connect a voltmeter and load (if any) to the vout pad. 4) for normal operation, place the shunt across pins 1 and 2 of jumper ju1. 5) turn on the power supply and verify that the output voltage is 5v. note: indicate that you are using the max1649 when contacting these component suppliers. + denotes lead-free and rohs compliant. designation qty description c1, c6 2 68?, 20v ?0% tantalum capacitors(e-case) avx tpse686m020r0150 c2 1 330?, 10v ?0% tantalum capacitor(e-case) avx tpse337k010r0060 c3, c4 2 0.1? ?0% ceramic capacitors(0805) panasonic ecj-3vb1h104k c5 0 not installed, capacitor (1206) c7 0 not installed, capacitor (d-case) d1 1 schottky diodenihon nsq03a03l ju1 1 3-pin header ju3 0 not installed, shorted by pc trace l1 1 47? inductorsumida cdrh125np-470mc p1 1 p-channel mosfet (8-pin so-8)international rectifier irf7416pbf fairchild nds8435a_nl r1 1 0.050 ?%, 0.5w resistor (2010) dale wsl2010r0500feairc lrc-lr2010lf-01-r050-f r2 0 not installed, resistor (1206) r3 0 not installed, resistor (1206)?hortedby pc trace u1 1 max1649csa+ (8-pin so-8) 1 shunt 1 pcb: max1649 evaluation kit+ part type MAX1649EVKIT-SO+ ev kit supplier phone website avx 843-946-0238 www.avx.com fairchild 888-522-5372 w w w .fai r chi l d sem i .com internationalrectifier 310-322-3331 irf.com irc 361-992-7900 irctt.com nihon/niec 847-843-7500 www.niec.co.jp panasonic 800-344-2112 www.panasonic.com sumida corp. 847-545-6700 www.sumida.com vishay/daleresistors 402-564-3131 www.vishay.com downloaded from: http:///
evaluates: max649/max651/max652/max1649/max1651 max1649 evaluation kit 2 _______________________________________________________________________________________ _______________detailed description shutdown control the max1649 provides a shdn pin to disable the out-put. table 1 lists the options available for shutdown control jumper ju1. an external controller can be used by removing the shunt on ju1 completely and connect- ing the external controller to the pad labeled shdn. shdn is a ttl/cmos logic-level input. output voltage adjustment the output voltage can be adjusted with minor modifi-cations to the ev kit board. first, select output voltage- divider resistors r2 and r3 (refer to the setting the output voltage section of the max1649 data sheet). second, open jumper ju3 and resistor r3 by cuttingthe thin pcb trace between their pads. finally, install r2 and r3. the standard output filter capacitor is rated at 10v. use a higher-rated capacitor if necessary. when using the max1651 or when adjusting the output of either device, an input voltage below 5.5v is accept- able. however, the input voltage must be high enoughto avoid dropout (refer to the typical operating charac- teristics of the max1649/max1651 data sheet). evaluating the max649/max651/max652 the max1649 ev kit can also be used to evaluate themax649/max651/max652. in addition to replacing the max1649 with a max649, change resistor r1 to 0.1 . contact maxim for free samples of the max649csa,max651csa, or max652csa. note that the max1649/ max1651 are recommended over the max649/ max651/max652 for new designs. table 1. jumper ju1 functions max1649 v+shdn ref gnd fb out ext cs 53 31 48 67 123 4 5678 12 vin shdn 5.5v to 16.5v c1 68 f 20v c4 0.1 f c668 f 20v r10.05 1% u1 ju1 off on 2 r3 short (pcb trace) r2 open c5 open ju3 p1 l1 47 h d1 vout c2330 f 10v c7open gnd c3 0.1 f figure 1. max1649 ev kit schematic shunt location shdn pin max1649 output 1 and 2 connected to gnd max1649 enabled,v out = 5v 2 and 3 connected to vin shutdown mode,v out = 0v downloaded from: http:///
evaluates: max649/max651/max652/max1649/max1651 max1649 evaluation kit _______________________________________________________________________________________ 3 figure 2. max1649 ev kit component placement guide component side figure 3. max1649 ev kit pcb layout?omponent side figure 4. max1649 ev kit pcb layout?older side 1.0" 1.0" 1.0" downloaded from: http:///
evaluates: max649/max651/max652/max1649/max1651 max1649 evaluation kit maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 4 _____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2007 maxim integrated products is a registered trademark of maxim integrated products, inc. revision number revision date description pages changed 0 10/97 initial release 1 11/07 update for rohs compliance; update component suppliers list 1, 2, 3 revision history downloaded from: http:///
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