View MAX1549_4115694.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

general description the MAX1549 evaluation kit (ev kit) demonstrates the MAX1549? standard application circuit. this dc-dc converter steps down high-voltage batteries and/or ac adapters, generating precision low-voltage chipset and ram power supplies for notebook computers. the MAX1549 ev kit provides a dynamically adjustable 0.7v to 1.5v output voltage range (out1), and a fixed 2.5v output voltage (out2) from a 5v to 20v battery input range. it delivers up to a 6a output current for out1, and up to a 4a output current for out2, with greater than 90% efficiency. the ev kit operates at 300khz switching frequency and has superior line- and load-transient response. this ev kit is a fully assembled and tested circuit board. it is capable of evaluating other dynamically adjustable output voltages in the 0.5v to 2.0v range by changing r10?14. other fixed output voltages in the 0.5v to 2.7v range can be evaluated by changing r20 and r21. features ? 5v to 20v input voltage range ? four digitally selectable operating voltages (out1) ? dynamically selectable output voltages 0.7v/1.0v/1.3v/1.5v (out1, adjustable from 0.5v to 2.0v) ? fixed 2.5v output voltage (out2, adjustable from 0.5v to 2.7v) ? 6a output current (out1) ? 4a output current (out2) ? 300khz switching frequency ? independent power-good outputs ? low-profile components ? fully assembled and tested evaluates: MAX1549 MAX1549 evaluation kit ________________________________________________________________ maxim integrated products 1 19-3299; rev 0; 5/04 component list 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 MAX1549evkit 0 o c to +70 o c 40 thin qfn (6mm x 6mm) designation qty description c1, c19 0 not installed (e-case) c2 1 470?, 2.5v, 6m ? low-esr polymer capacitor (e-case) sanyo 2r5tpd470m6 c3 1 220?, 4v, 15m ? low-esr capacitor (d-case) sanyo 4tpe220mf c4, c5 2 10? ?0%, 25v x5r ceramic capacitors (1812) taiyo yuden tmk432bj106km or tdk c4532x5r1e106m c6, c7 0 not installed (1812) c8, c9 2 0.1? ?0%, 50v x7r ceramic capacitors (0603) murata grm188r71h104k or equivalent c10, c11, c20?26 0 not installed (0603) designation qty description c12 1 2.2?, 10v x5r ceramic capacitor (0612) tdk c1632x5r1a225ktb09n c13, c16 2 470pf ?0%, 50v x7r ceramic capacitors (0603) murata grm188r71h471k or equivalent c14 1 0.22?, 16v x5r ceramic capacitor (0805) taiyo yuden emk212bj224kg c15 1 1? ?0%, 10v x5r ceramic capacitor (0805) taiyo yuden lmk212bj105kg or tdk c2012x7r1c105mkt c17, c18 2 100pf ?%, 50v c0g ceramic capacitors (0603) murata grm1885c1h101j or equivalent
evaluates: MAX1549 MAX1549 evaluation kit 2 _______________________________________________________________________________________ quick start equipment needed 5v to 20v power supply, battery, or notebook ac adapter dc bias power supply, 5v at 100ma dummy loads capable of sinking 6a ? igital multimeters (dmms) 100mhz dual-trace oscilloscope component suppliers component list (continued) designation qty description c27, c28 2 10? ?0%, 6.3v x5r ceramic capacitors (0805) tdk c2012x5r0j106m or taiyo yuden amk212bj106mg d1, d2 2 1a, 30v schottky diodes nihon ep10qy03 or toshiba crs02 d3 1 100ma, 30v dual schottky diode (sot23) central semiconductor cmpsh-3a ju1, ju2, ju6 3 3-pin headers ju3 0 not installed, 4-pin header ju4, ju5 2 2-pin headers ju1 (1,2) ju2 (1,2) ju6 (1,2) 4 shunts l1 1 1.5?, 7a power inductor sumida cdrh105r-1r5 l2 1 4.7?, 5.7a power inductor sumida cdrh124-4r7 n1, n3 2 n-channel mosfets (8-pin so) fairchild fds6612a n2, n4 2 n-channel mosfets (8-pin so) fairchild fds6670a supplier phone fax website central semiconductor 516-435-1110 516-435-1824 www.centralsemi.com dale-vishay 402-564-3131 402-563-6296 www.vishay.com fairchild 408-721-2181 408-721-1635 www.fairchildsemi.com irc 361-992-7900 361-992-3377 www.irctt.com murata 770-436-1300 770-436-3636 www.murata.com nihon 847-843-7500 847-843-2798 www.niec.co.jp sanyo 619-661-6835 619-661-1055 www.sanyovideo.com sumida 708-956-0666 708-956-0702 www.sumida.com taiyo yuden 800-348-2496 847-925-0899 www.t-yuden.com tdk 847-390-4373 847-390-4428 www.component.tdk.com designation qty description r1 1 0.012 ? ?%, 0.5w resistor (2010) irc lr2010-01-r012-f or dale wsl-2010-r012f r2 1 0.015 ? ?%, 0.5w resistor (2010) irc lr2010-01-r015-f or dale wsl-2010-r015f r3?6, r22, r23 0 not installed (short pc trace) (0603) r7, r8, r27, r28 4 100k ? ?% resistors (0603) r9 1 10 ? ?% resistor (0805) r10, r15?18 5 100k ? ?% resistors (0603) r11 1 301k ? ?% resistor (0603) r12 1 487k ? ?% resistor (0603) r13 1 150k ? ?% resistor (0603) r14 1 66.5k ? ?% resistor (0603) r19, r20, r24, r25, r26, r29, r32 0 not installed (0603) r21 1 0 ? ?% resistor (0603) u1 1 MAX1549etl (40-pin thin qfn 6mm x 6mm) none 4 rubber bumpers none 1 MAX1549 pc board note: indicate that you are using the MAX1549 when contacting these component suppliers.
procedure 1) ensure that the circuit is connected correctly to the supplies and dummy loads prior to applying any power. 2) verify that the shunts are installed across pins 1 and 2 of jumper ju1 (on1 high), pins 1 and 2 of jumper ju2 (on2 high), and pins 1 and 2 of ju6 ( skip high, forced pwm). 3) turn on battery power prior to +5v bias power; oth- erwise, the output uvlo timer times out and the fault latch is set, disabling the regulator outputs until +5v power is cycled or on1/on2 is toggled. 4) verify that the output voltages are v out1 = 1.5v, v out2 = 2.5v. detailed description jumper settings evaluates: MAX1549 MAX1549 evaluation kit _______________________________________________________________________________________ 3 note: do not change the operating frequency without first recalculating component values. the frequency has a signifi- cant effect on preferred inductor value, peak current-limit level, mosfet heating, pfm/pwm switchover point, output noise, efficiency, and other critical parameters . table 1. jumper ju1 functions (output voltage out1 control) ju1 on1 pin out1 1 and 2 (default) connected to vcc. out1 enabled, v out1 = 1.5v. out1 depends on gate inputs g0 and g1. see table 4. 2 and 3 connected to gnd. out1 shutdown mode not installed on 1 m ust b e d r iv en b y an exter nal si g nal connected to on1 p ad. out1 operation depends on the external on1 signal levels. table 4. jumpers ju4 and ju5 functions (gate inputs g0 and g1) ju4 ju5 out1 not installed g0 = gnd not installed g1 = gnd 1.50v (default) installed g0 = vcc not installed g1 = gnd 1.30v not installed g0 = gnd installed g1 = vcc 1.00v installed g0 = vcc installed g1 = vcc 0.70v table 5. jumper ju6 functions (low-noise mode) ju6 skip pin operational mode 1 and 2 (default) connected to vcc. low-noise mode, out1 and out2 are in forced pwm mode. 2 and 3 connected to gnd. out1 and out2 are in pulse-skipping mode. table 2. jumper ju2 functions (output voltage out2 control) ju2 on2 pin out2 1 and 2 (default) connected to vcc. out2 enabled, v out2 = 2.5v 2 and 3 connected to gnd. out2 shutdown mode not installed on 2 m ust b e d r iv en b y an exter nal si g nal connected to on2 p ad. out2 operation depends on the external on2 signal levels. table 3. jumpers ju3 functions (switching-frequency selection) ju3 ton pin frequency (khz) 1 and 2 connected to vcc 400 1 and 3 connected to ref 200 1 and 4 connected to gnd 100 not installed (default) floating 300 (as shipped)
evaluates: MAX1549 evaluating other dynamic output voltages (out1) the ev kit output is preset to 0.7v/1.0v/1.3v/1.5v (out1). g0 (ju4) and g1 (ju5) gate inputs select the out1 voltage (see table 4). however, out1 can also be adjusted between 0.5v and 2.0v by selecting r10 r14 values. refer to the MAX1549 data sheet output voltage section for more information. evaluating other fixed output voltages (out2) the MAX1549 provides a fixed 2.5v output (out2) when fb2 is connected to gnd (r20 = open, r21 = 0, r19 = open) or a fixed 1.8v output when fb2 is con- nected to vcc (r20 = open, r21 = open, r19 = 0). out2 can also be adjusted from 0.5v to 2.7v by using a resistive voltage-divider formed by r20 and r21 (r19 = open). the MAX1549 regulates fb2 to a fixed refer- ence voltage (0.5v). the adjusted output voltage is: v out2 = v fb2 (1 + r20 / r21) where v fb2 = 0.5v a 330pf to 1000pf feed-forward bypass capacitor (c26) reduces duty-cycle jitter and feedback noise. refer to the MAX1549 data sheet for selection of out- put-capacitor and inductor values for different output voltages. MAX1549 evaluation kit 4 _______________________________________________________________________________________
evaluates: MAX1549 MAX1549 evaluation kit _______________________________________________________________________________________ 5 l r d1 MAX1549 u1 pgood1 v cc od1 out1 pgood1 csl1 csh1 bst1 dh1 n.c. lx1 dl1 skip n.c. v dd pgnd bst2 dh2 n.c. dl2 pg00d2 fb2 out2 od2 od3 gnd n.c. refin ref ilim1 cc1 ilim2 skip g0 fsel g1 fblank on1 on2 vref n1 1 1 4 3 2 3 2 1 2 d3 3 4 5 6 5 6 7 8 7 8 n2 vout1 200khz 100khz 400khz vcc vcc vref vref g0 ju3 ju4 open 300k ? 1 2 3 4 l1 1.5 h c14 0.22 f c16 470pf vout1 0.7v to 1.5v at 6a gnd vin gnd 20v max r29 open vbias +5v r1 0.012 ? 1% r16 100k ? 1% r11 301k ? 1% r10 100k ? 1% r14 66.5k ? 1% r13 150k ? 1% r12 487k ? 1% r6 short (pc trace) r5 short (pc trace) r22 short (pc trace) r23 short (pc trace) r4 short (pc trace) r3 short (pc trace) c1 open c10 open r15 100k ? 1% c17 100pf c23 open c13 470pf c22 open c20 open c2 470 f 2.5v c9 0.1 f c12 2.2 f c11 open c26 open c25 open c8 0.1 f 37 38 39 40 vdd vcc r9 10 ? c15 1 f c4 10 f 25v c6 open vcc vin c28 10 f 6.3v vout1 r7 100k ? 4 3 1 2 6 5 vref vcc r18 100k ? 1% r17 100k ? 1% vref vref r24 open c18 100pf r27 100k ? r26 open r25 open vcc g1 on1 ju5 r28 100k ? c24 open 7 8 9 10 11 vcc ju1 1 2 3 12 vcc ju6 1 2 3 vcc vdd on2 vcc ju2 1 2 3 13 34 33 35 36 29 32 31 30 27 28 25 26 23 22 bst1 vcc vout2 r20 open r21 0 ? r19 open vcc r8 100k ? bst1 n4 n3 d2 lx2 csh2 csl2 1 1 4 3 2 3 2 4 5 6 5 6 7 8 7 8 l2 4.7 h vout2 pg00d2 r32 open r2 0.015 ? 1% c3 220 f 4v c21 open c19 open c5 10 f 25v c7 open vin c27 10 f 6.3v vout2 vout2 19 21 24 14 15 18 16 17 20 figure 1. MAX1549 ev kit schematic
evaluates: MAX1549 MAX1549 evaluation kit 6 _______________________________________________________________________________________ figure 2. MAX1549 ev kit component placement guide?omponent side
evaluates: MAX1549 MAX1549 evaluation kit _______________________________________________________________________________________ 7 figure 3. MAX1549 ev kit component placement guide?older side
evaluates: MAX1549 MAX1549 evaluation kit 8 _______________________________________________________________________________________ figure 4. MAX1549 ev kit pc board layout?round/signal layer 2
evaluates: MAX1549 MAX1549 evaluation kit _______________________________________________________________________________________ 9 figure 5. MAX1549 ev kit pc board layout?round plane layer 3
evaluates: MAX1549 MAX1549 evaluation kit 10 ______________________________________________________________________________________ figure 6. MAX1549 ev kit pc board layout?omponent side
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. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 11 2004 maxim integrated products printed usa is a registered trademark of maxim integrated products. evaluates: MAX1549 MAX1549 evaluation kit figure 7. MAX1549 ev kit pc board layout?older side

▲Up To Search▲

Price & Availability of MAX1549

	To Download MAX1549 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .