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evaluates: max17541g in 5v output-voltage application max17541g 5v output evaluation kit general description the max17541g 5v output ev kit provides a proven design to evaluate the max17541g 5v high-efficiency, high-voltage, synchronous step-down dc-dc converter. the ev kit generates 5v at load currents up to 500ma from a 6v to 42v input supply. the ev kit features a 600khz fixed switching frequency for optimum efficiency and component size. the ev kit features a forced-pwm control scheme that provides constant switching-frequency operation at all load and line conditions. features operates from a 6v to 42v input supply 5v output voltage 500ma output current 600khz switching frequency enable /uvlo input resistor-programmable uvlo threshold open-drain reset output overcurrent and overtemperature protection proven pcb layout fully assembled and tested quick start recommended equipment max17541g 5v output ev kit 6v to 42v, 2a dc input power supply load capable of sinking 500ma digital voltmeter (dvm) function generator procedure the ev kit is fully assembled and tested. follow the steps below to verify the board operation. caution: do not turn on power supply until all connections are completed. 1) set the power supply at a voltage between 6v and 42v. disable the power supply. 2) connect the positive terminal of the power supply to the vin pcb pad and the negative terminal to the nearest pgnd pcb pad. connect the positive terminal of the 500ma load to the vout pcb pad and the negative terminal to the nearest pgnd pcb pad. 3) connect the dvm across the vout pcb pad and the nearest pgnd pcb pad. 4) turn on the dc power supply. 5) enable the load. 6) verify that the dvm displays 5v. to turn-on/off the part from en/uvlo, follow the steps below: 1) connect the power supply to the ev kit and turn on the power supply. set the power supply at a voltage between 6v and 42v. 2) connect the function generator output to the en /uvlo test loop. 3) en/uvlo rising threshold is 1.24v and falling threshold is 1.11v. make sure that the voltage-high and voltage-low levels of the function generator output are greater than 1.24v and less than 1.11v, respectively. 4) while powering down the ev kit, irst disconnect the function generator output from the en/uvlo test loop and then turn off the dc power supply. 19-7723; rev 0; 7/15 ordering information appears at end of data sheet. downloaded from: http:///
maxim integrated 2 www.maximintegrated.com evaluates: max17541g in 5v output-voltage application max17541g 5v output evaluation kit detailed description of hardware the max17541g 5v output ev kit provides a proven design to evaluate the 5v high-efficiency, high-voltage, synchronous step-down dc-dc converter. the ev kit generates 5v at load currents up to 500ma from a 6v to 42v input supply. the ev kit features a 600khz fixed switching frequency for optimum efficiency and component size. the ev kit features a forced-pwm control scheme that provides constant switching-frequency operation at all load and line conditions. the ev kit includes an en/uvlo pcb pad to enable control of the converter output. an additional reset pcb pad is available for monitoring the open-drain logic output. the vcc pcb pad helps measure the internal ldo voltage. soft-start input (ss) the device utilizes an adjustable soft-start function to limit inrush current during startup. the soft-start time is adjusted by the value of c3, the external capacitor from ss to gnd. to adjust the soft-start time, determine c3 using the following formula: c3 = 5.55 x t ss where t ss is the required soft-start time in milliseconds and c3 is in nanofarads. regulator enable/undervoltage-lockout level (en/uvlo) the device features an en/uvlo input. for normal operation, no shunts should be installed across pins 1-2 or 2-3 on jumper ju1. to disable the output, install a shunt across pins 2-3 on ju1 and the en/uvlo pin is pulled to gnd. see table 1 for ju1 settings. setting the undervoltage-lockout level the device offers an adjustable input undervoltage- lockout level. set the voltage at which the device turns on with a resistive voltage-divider connected from vin to gnd (see figure 1 ). connect the center node of the divider to en/uvlo. choose r1 to be 3.3m and then calculate r2 as follows: inu r1 1.218 r2 (v 1.218) = ? where v inu is the voltage at which the device is required to turn on. ensure that v inu is higher than 0.8 x v out . adjusting the output voltage the device offers an adjustable output voltage. set the output voltage with a resistive voltage-divider connected from the positive terminal of the output capacitor (v out ) to gnd (see schematic attached to this pdf). connect the center node of the voltage-divider to fb. to choose the values of r4 and r5, select the parallel combination of r4 and r5, with r p less than 15k. once r p is selected, calculate r4 as follows: p out rv r4 0.9 = calculate r5 as follows: out r4 0.9 r5 (v 0.9) = ? table 1. regulator enable (en/uvlo) jumper ju1 settings *default position. shunt position ev/uvlo pin max17541g 5v output not installed* connected to the center node of resistor-divider r1 and r2 enabled, uvlo level set through the r1 and r2 resistor-divider 2-3 connected to gnd disabled downloaded from: http:///
maxim integrated 3 www.maximintegrated.com evaluates: max17541g in 5v output-voltage application max17541g 5v output evaluation kit figure 1. max17541g 5v output load and line regulation figure 2. max17541g 5v output efficiency 4.87 4.89 4.91 4.93 4.95 4.97 4.99 5.01 5.03 5.05 0 100 200 300 400 500 output voltage (v) load current (ma) 5 v output load and line regulation v in = 36v v in = 24v v in = 12v 40 50 60 70 80 90 100 50 100 150 200 250 300 350 400 450 500 e ff icie nc y (%) load curr ent (ma) 5v o utput e ff icie nc y vs. lo ad curr ent v in = 36 v v in = 24 v v in = 12 v l1 = 74404054470 figure 3. max17541g 5v output efficiency figure 4. max17541g 5v output 250ma to 500ma load transient 40 50 60 70 80 90 100 50 100 150 200 250 300 350 400 450 500 e ff icie nc y (%) load curr ent (ma) 5v o utput e ff icie nc y vs. lo ad curr ent v in = 36 v v in = 24 v v in = 12 v l1 = xfl6060-473 40 s /div 100mv/div 5v output (load current stepped from 0.25a to 0.5a) v out (ac) 200ma/div i out 40 s /div 100mv/div 5v output (load current stepped from 0a to 0.25a) v out (ac) 100ma/div i out bode plot gain phase (o) gain (db) frequency(hz) f cr = 53.6khz, phase margin = 56.9 gain phase figure 5. max17541g 5v output no-load to 250ma load transient figure 6. max17541g 5v output full-load bode plot (v in = 24v) ev kit performance report downloaded from: http:///
maxim integrated 4 www.maximintegrated.com evaluates: max17541g in 5v output-voltage application max17541g 5v output evaluation kit #denotes rohs compliant. part type MAX17541GTBEVKIT# ev kit ordering information note: indicate that you are using the max17541g when contacting these component suppliers. supplier website coilcraft, inc. www.coilcraft.com murata americas www.murata.com panasonic corp. www.panasonic.com wurth group www.we-online.com component suppliers component information, pcb layout, and schematic see the following links for component information, pcb layouts, and schematic: max17541g 5v ev bom max17541g 5v pcb layout max17541g 5v ev schematic downloaded from: http:///
maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and speciications without n otice at any time. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. ? 2015 maxim integrated products, inc. 5 evaluates: max17541g in 5v output-voltage application max17541g 5v output evaluation kit revision number revision date description pages changed 0 7/15 initial release revision history for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com. downloaded from: http:///
ep 5v/ 500 ma 1 pgnd 2 vin 3 en/uvlo 4 vcc 5 fb/vo 10 lx 9 gnd 8 r ese t 7 comp 6 ss u1 m ax 17541 g l1 47 uh c4 10 uf r4 1% 82 .5k r5 1% 18 .2k vout c3 3300p f r3 1% 21 .5k c5 3300p f r6 1% 10 k c2 1uf 1 2 3 ju1 r1 1% 3. 32 m r2 1% 681 k c1 1uf vin pgnd + c7 33 uf r es et pgnd en/uvlo vcc gnd gnd c9 22p f r7 o pe n en/uvlo vin vin en/uvlo vout vout downloaded from: http:///
1.0" 888-maxim-ic max17541gtb evkit rev-a 03/15 ea pgnd pgnd gnd vcc vin vout + reset gnd en/uvlo 1 2 3 max17541gtb evkit a top silkscreen layer all units are in 0.001" date: rev property of www.maximintegrated.com c1 c2 c3 c5 ju1 r1 r2 r3 r4 r5 r6 c9 c4 r7 u1 c7 l1 c3 c5 ju1 r1 r2 r3 r4 r5 r6 c1 c2 c9 c4 r7 x6 u1 c7 l1 c3 c3x1 c3x2 c5 c5x1c5x2 ju1 ju1x1 ju1x2 ju1x3 x1 x1x1x1x2 x7 x7x1x7x2 x8 x8x1x8x2 x9 x9x1x9x2 x2 x2x1 x3 x3x1 x4 x4x1 x5 x5x1 r1 r1x1r1x2 r2 r2x1 r2x2 r3 r3x1 r3x2 r4 r4x1 r4x2 r5 r5x1 r5x2 r6 r6x1 r6x2 x10 x10x1x10x2 x11 x11x1 x11x2 x12 x12x1x12x2 x13 x13x1x13x2 x14 x14x1x14x2 c1 c1x1 c1x2 c2 c2x1c2x2 c9 c9x1 c9x2 c4 c4x1c4x2 r7 r7x1 r7x2 u1 u1x1u1x2u1x3u1x4u1x5 u1x6 u1x7 u1x8 u1x9 u1x10 u1x11 u1x12 u1x13 c7 c7x1 c7x2 l1 l1x1 l1x2 downloaded from: http:///
1.0" max17541gtb evkit a top soldermask layer all units are in 0.001" date: rev property of c3 c3x1 c3x2 c5 c5x1c5x2 ju1 ju1x1 ju1x2 ju1x3 x1 x1x1x1x2 x7 x7x1x7x2 x8 x8x1x8x2 x9 x9x1x9x2 x2 x2x1 x3 x3x1 x4 x4x1 x5 x5x1 r1 r1x1r1x2 r2 r2x1 r2x2 r3 r3x1 r3x2 r4 r4x1 r4x2 r5 r5x1 r5x2 r6 r6x1 r6x2 x10 x10x1x10x2 x11 x11x1 x11x2 x12 x12x1x12x2 x13 x13x1x13x2 x14 x14x1x14x2 c1 c1x1 c1x2 c2 c2x1c2x2 c9 c9x1 c9x2 c4 c4x1c4x2 r7 r7x1 r7x2 u1 u1x1u1x2u1x3u1x4u1x5 u1x6 u1x7 u1x8 u1x9 u1x10 u1x11 u1x12 u1x13 c7 c7x1 c7x2 l1 l1x1 l1x2 downloaded from: http:///
1.0" max17541gtb evkit a component side layer all units are in 0.001" date: rev property of c3 c3x1 c3x2 c5 c5x1c5x2 ju1 ju1x1 ju1x2 ju1x3 x1 x1x1x1x2 x7 x7x1x7x2 x8 x8x1x8x2 x9 x9x1x9x2 x2 x2x1 x3 x3x1 x4 x4x1 x5 x5x1 r1 r1x1r1x2 r2 r2x1 r2x2 r3 r3x1 r3x2 r4 r4x1 r4x2 r5 r5x1 r5x2 r6 r6x1 r6x2 x10 x10x1x10x2 x11 x11x1 x11x2 x12 x12x1x12x2 x13 x13x1x13x2 x14 x14x1x14x2 c1 c1x1 c1x2 c2 c2x1c2x2 c9 c9x1 c9x2 c4 c4x1c4x2 r7 r7x1 r7x2 u1 u1x1u1x2u1x3u1x4u1x5 u1x6 u1x7 u1x8 u1x9 u1x10 u1x11 u1x12 u1x13 c7 c7x1 c7x2 l1 l1x1 l1x2 figure 7 downloaded from: http:///
1.0" solder side max17541gtb evkit a layer all units are in 0.001" date: rev property of ju1 ju1x1 ju1x2 ju1x3 x1 x1x1x1x2 x7 x7x1x7x2 x8 x8x1x8x2 x9 x9x1x9x2 x2 x2x1 x3 x3x1 x4 x4x1 x5 x5x1 x10 x10x1x10x2 x11 x11x1 x11x2 x12 x12x1x12x2 x13 x13x1x13x2 x14 x14x1x14x2 u1 u1x11 downloaded from: http:///
1.0" max17541gtb evkit a bottom soldermask layer all units are in 0.001" date: rev property of ju1 ju1x1 ju1x2 ju1x3 x1 x1x1x1x2 x7 x7x1x7x2 x8 x8x1x8x2 x9 x9x1x9x2 x2 x2x1 x3 x3x1 x4 x4x1 x5 x5x1 x10 x10x1x10x2 x11 x11x1 x11x2 x12 x12x1x12x2 x13 x13x1x13x2 x14 x14x1x14x2 u1 u1x11 downloaded from: http:///
reference description quantity designator part number 1 1f 10%, 50v x7r ceramic capacitor (1206) 1 c1 murata grm31mr71h105k 2 1f 10%, 6.3v x7r ceramic capacitor (0603) 1 c2 murata grm188r70j105k 3 3300pf 10%, 50v x7r ceramic capacitor (0402) 1 c3 murata grm155r71h332k 4 10uf 10%, 6.3v x7r ceramic capacitor (1206) 1 c4 murata grm31cr70j106k 5 3300pf 10%, 50v x7r ceramic capacitor (0402) 1 c5 murata grm155r71h332k 6 33uf 50v aluminum electrolytic (d=6.3mm) 1 c7 panasonic eee-fk1h330xp 7 22pf 5%, 50v c0g ceramic capacitor (0402) 1 c9 murata grm1555c1h220j 8 3-pin header (36-pin header 0.1 centers ) 1 ju1 sullins: ptc36saan 9 47uh inductor (5mm x 5mm x 4mm) 1 l1 wurth electronics 74404054470 10 47uh inductor (6.56mm x 6.36mm x 5.1mm) 0 l1 (alternate inductor) coilcraft xfl6060-473me_ 11 3.32m ohm 1%, resistor (0402) 1 r1 12 681k ohm 1%, resistor (0402) 1 r2 13 21.5k ohm 1%, resistor (0402) 1 r3 14 82.5k 1% ohm resistor (0402) 1 r4 15 18.2k 1% ohm resistor (0402) 1 r5 16 10k ohm 1%, resistor (0402) 1 r6 17 not installed, resistor (0402) 0 r7 18 buck converter (10tdfn 3mmx2mm) max17541gatb+ 1 u1 max17541gatb+ 19 shunt 1 see jumper table sullins stc02syan jumper shunt position ju1 1-2 jumper table bill of materials (revision 7/15) downloaded from: http:///

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