19-6436; rev 1; 10/13 ordering information appears at end of data sheet. component list general description the max17501b/max17501f evaluation kits (ev kits) provide proven designs to evaluate the max17501b/ max17501f high-efficiency, high-voltage, synchronous step-down dc-dc converters. the ev kits use these devices to generate a fixed 5v at load currents up to 500ma from a 6v to 60v input supply. the max17501b supports a pfm control scheme with high light-load efficiency, while the max17501f features a forced- pwm control scheme that provides constant switching- frequency operation at all load and line conditions. features s operates from a 6v to 60v input supply s 5v fixed output voltage s 500ma output current s 600khz switching frequency s enable/uvlo input s resistor-programmable uvlo threshold s open-drain reset output s overcurrent and overtemperature protection s pfm/pwm (max17501b ev kit) s pwm (max17501f ev kit) s proven pcb layout s fully assembled and tested max17501b/max17501f evaluation kits evaluate: max17501b/max17501f in tdfn packages designation qty description c1 1 1 f f q 10%, 100v x7r ceramic capacitor (1206)murata grm31cr72a105ka01l c2 1 1 f f q 10%, 6.3v x7r ceramic capacitor (0603)murata grm188r70j105k c3 1 3300pf q 10%, 50v x7r ceramic capacitor (0402)murata grm155r71h332k c4 1 10 f f q 10%, 10v x7r ceramic capacitor (1206)murata grm31cr71a106k c7 1 33 f f, 80v aluminum electrolytic (d = 8mm)panasonic eeefk1k330p designation qty description ju1 1 3-pin header l1 1 47 f h, 1.4a inductor (6mm x 6mm x 3.5mm)coilcraft lps6235-473ml r1 1 3.32m i q 1% resistor (0402) r2 1 866k i q 1% resistor (0402) r4 1 100 i resistor (0402) r6 1 10k i q 1% resistor (0402) tp1, tp2 0 not installed, test points u1 1 see the ev kit-specific component list ? 1 shunt ? 1 pcb: see the ev kit-specific component list for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrated?s website at www.maximintegrated.com. downloaded from: http:///
ev kit-specific component list component suppliers quick start recommended equipment ? max17501b or max17501f ev kit ? 6v to 60v, 1a 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 60v. 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) verify that a shunt is installed across pins 1-2 on jumper ju1. 5) turn on the dc power supply. 6) enable the load. 7) verify that the dvm displays the expected voltage. to turn-on/off the part from en/uvlo, follow the steps below: 1) remove resistors r1 and r2 and the jumper installed across pins 1-2 on jumper ju1. 2) connect the power supply to the ev kit and turn on the power supply. set the power supply at a voltage between 6v and 60v. 3) connect the function generator output to the en/uvlo test loop. 4) 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. 5) while powering down the ev kits, first disconnect the function generator output from the en/uvlo test loop and then turn off the dc power supply. care should be taken in board layout and systems wir - ing to prevent violation of the absolute maximum rating of the fb/vo pin under short-circuit conditions. under such conditions, it is possible for the ceramic output capacitor to oscillate with the board or wiring inductance between the note: indicate that you are using the max17501 when contacting these component suppliers. * ep = exposed pad. 2 maxim integrated max17501b/max17501f evaluation kits evaluate: max17501b/max17501f in tdfn packages ev kit designation description MAX17501BTEVKIT# u1 buck converter (10 tdfn-ep*)maxim max17501batb+ ? pcb: max17501bt evaluation kit max17501ftevkit# u1 buck converter (10 tdfn-ep*)maxim max17501fatb+ ? pcb: max17501ft evaluation kit supplier phone website coilcraft, inc. 847-639-6400 www.coilcraft.com murata electronics north america, inc. 770-436-1300 www.murata-northamerica.com panasonic corp. 800-344-2112 www.panasonic.com downloaded from: http:///
capacitor and short-circuited load, and thereby cause the absolute maximum rating of fb/vo (-0.3v) to be exceeded. this parasitic board or wiring inductance should be mini - mized and the output voltage waveform under short-cir - cuit operation should be verified to ensure that the absolute maximum rating of fb/vo is not exceeded. detailed description of hardware the max17501b/max17501f ev kits provide proven designs to evaluate the max17501b /max17501f high- efficiency, high-voltage, synchronous step-down dc-dc converters. the ev kits generate a fixed 5v, at load cur - rents up to 500ma, from a 6v to 60v input supply. the ev kits feature a 600khz fixed switching frequency for optimum efficiency and component size. the max17501b ev kit supports a pfm control scheme with high light-load efficiency, while the max17501f ev kit features a forced- pwm control scheme that provides constant switching- frequency operation at all load and line conditions. the ev kits include an en/uvlo pcb pad and jumper ju1 to enable control of the converter output. an additional reset pcb pad is available for monitor - ing the converter output. the vcc pcb pad helps measure the internal ldo voltage. soft-start input (ss) the devices utilize 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 devices feature an en/uvlo input. for normal operation, a shunt should be installed across pins 1-2 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 devices offer 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. connect the center node of the divider to en/ uvlo. choose r1 to be 3.3m i and then calculate r2 as follows: inu r1 1.218 r2 (v 1.218) = ? where v inu is the voltage at which the ic is required to turn on. * default position. table 1. regulator enable (en/uvlo) jumper ju1 settings 3 maxim integrated max17501b/max17501f evaluation kits evaluate: max17501b/max17501f in tdfn packages shunt position en/uvlo pin max17501_ output 1-2* connected to in enabled 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:///
figure 2. max17501f load and line regulation figure 1. max17501b load and line regulation ev kits performance report figure 3. max17501b efficiencyfigure 4. max17501f efficiency 4 maxim integrated max17501b/max17501f evaluation kits evaluate: max17501b/max17501f in tdfn packages load and line regulation (max17501b) load current (ma) output voltage (v) 450 400 350 300 250 200 150 100 50 4.95 5.155.10 5.05 5.00 5.204.90 0 500 vin = 12v vin = 24v vin = 36v vin = 48v efficiency vs. load current (max17501b) load current (ma) efficiency (%) 100 10 40 50 60 70 80 90 100 30 1 vin = 12v vin = 24v vin = 36v vin = 48v load and line regulation (max17501f) load current (ma) output voltage (v) 450 400 350 300 250 200 150 100 50 0 500 4.974.96 4.98 4.99 5.00 5.01 5.035.02 5.04 5.054.95 vin = 48v vin = 36v vin = 24v vin = 12v efficiency vs. load current (max17501f) load current (ma) efficiency (%) 450 400 300 350 150 200 250 100 50 60 70 80 90 100 40 50 500 vin = 48v vin = 12v vin = 36v vin = 24v downloaded from: http:///
figure 6. max17501b 5ma to 255ma load transient ev kits performance report (continued) figure 8. max17501b/max17501f 250ma to 500ma load transient figure 7. max17501f no load to 250ma load transient figure 5. max17501b/max17501f full-load bode plot (vin = 24v) 5 maxim integrated max17501b/max17501f evaluation kits evaluate: max17501b/max17501f in tdfn packages f cr = 49.8khz pm = 62 45 67 89 12 v out (ac) 100mv/div i out 100ma/div 20s/div v out (ac) 100mv/div i out 100ma/div 200s/div v out (ac) 100mv/div i out 200ma/div 20s/div downloaded from: http:///
figure 9. max17501b/max17501f ev kits schematic 6 maxim integrated max17501b/max17501f evaluation kits evaluate: max17501b/max17501f in tdfn packages pgnd 1 pgndvin en/uvlo vcc fb /v os s 6 gnd 9 lx 10 n.c. 7 reset 8 r610k 1% vout c410f r4100 l1 47h ep 2 34 5 vin vout vin en/uvlo vcc gnd c7 33 f c1 1 f e n/ uvlo c2 1 f c33300p f vin 1 3 2 ju1 en/uvlo r2866k 1% r13.32m 1% reset pgnd 5v/500ma tp2 vout tp1 gnd u1 max17501 downloaded from: http:///
figure 11. max17501f ev kit component placement guide?component side figure 13. max17501b/max17501f ev kits pcb layout?solder side figure 12. max17501b/max17501f ev kits pcb layout?component side figure 10. max17501b ev kit component placement guide?component side 7 maxim integrated max17501b/max17501f evaluation kits evaluate: max17501b/max17501f in tdfn packages 1 2 1 2 3 1 2 1 2 1 2 1 2 1 1 1 1 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 1 1 2 1 2 3 4 5 6 7 8 9 10 11 12 13 1 2 1 2 1.0?? 1 2 1 2 3 1 2 1 2 1 2 1 2 1 1 1 1 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 1 1 2 1 2 3 4 5 6 7 8 9 10 11 12 13 1 2 1 2 1.0?? 1 2 1 2 3 1 2 1 2 1 2 1 2 1 1 1 1 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 1 1 2 1 2 3 4 5 6 7 8 9 10 11 12 13 1 2 1 2 1.0?? 1 2 3 1 2 1 2 1 2 1 2 1 1 1 1 1 2 1 2 1 2 1 2 1 2 1 1 11 1.0?? downloaded from: http:///
figure 15. max17501b/max17501f ev kits pcb layout?bottom solder mask figure 14. max17501b/max17501f ev kits pcb layout?top solder mask 8 maxim integrated max17501b/max17501f evaluation kits evaluate: max17501b/max17501f in tdfn packages 1.0?? 1.0?? downloaded from: http:///
ordering information # denotes rohs compliant. 9 maxim integrated max17501b/max17501f evaluation kits evaluate: max17501b/max17501f in tdfn packages part type MAX17501BTEVKIT # ev kit max17501ftevkit # ev kit downloaded from: http:///
revision history 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 specifications without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 10 ? 2013 maxim integrated products, inc. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. max17501b/max17501f evaluation kits evaluate: max17501b/max17501f in tdfn packages revision number revision date description pages changed 0 8/12 initial release ? 1 10/13 replaced the r4 resistor value from 0 w to 100 w in the component list and figure 9 schematic; added new paragraph to the procedure section about preventing violation of the abs max rating for fb/vo 1, 2, 6 downloaded from: http:///
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