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general description the max17574 5v output evaluation kit (ev kit) provides a proven design to evaluate the max17574 high-voltage, high-efficiency, synchronous step-down dc-dc converter. the ev kit is preset for 5v output at load currents up to 3a and features a 500khz switching frequency for optimum efficiency and component size. the ev kit features adjustable input undervoltage lockout, adjustable soft-start, open-drain reset signal, and external frequency synchronization. features operates from a 6.5v to 60v input supply 5v output voltage up to 3a output current 500khz switching frequency enable/uvlo input, resistor-programmable uvlo threshold adjustable soft-start time mode/sync pin to select among pwm, pfm, or dcm modes open-drain reset output external frequency synchronization overcurrent and overtemperature protection proven pcb layout fully assembled and tested 19-8745; rev 0; 12/16 ordering information appears at end of data sheet. evaluates: max17574 in 5v output-voltage application max17574 5v output evaluation kit
maxim integrated 2 quick start recommended equipment max17574 5v output ev kit 6.5v to 60v, 5a dc input power supply load capable of sinking 3a digital voltmeter (dvm) 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 6.5v 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 3a 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 shunts are installed across pins 1-2 on jumper ju1 and pins 2-3 on jumper ju3 (see table 1 for details). 5) select the shunt position on jumper ju2 according to the intended mode of operation (see table 2 for details). 6) turn on the dc power supply. 7) enable the load. 8) verify that the dvm displays 5v. detailed description the max17574 5v output ev kit provides a proven design to evaluate the max17574 high-voltage, high- efficiency, synchronous step-down dc-dc converter. the ev kit is preset for 5v output from 6.5v to 60v input at load currents up to 3a and features a 500khz switching frequency for optimum efficiency and component size. the ev kit includes an en/uvlo pcb pad and jumper ju1 to enable the output at a desired input voltage. the sync pcb pad and jumper ju3 allow an external clock to synchronize the device. jumper ju2 allows the selection of a particular mode/sync of operation based on light-load performance requirements. an additional reset pcb pad is available for monitoring whether the converter output is in regulation. 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 c8, the external capacitor from ss to gnd. the selected output capacitance (c sel ) and the output voltage (v out ) determine the minimum value of c8, as shown by the following equation: c8 28 x 10 -6 x c sel x v out the soft-start time (t ss ) is related to c8 by the following equation: t ss = c8/(5.55 x 10 -6 ) for example, to program a 1ms soft-start time, c8 should be 5.6nf. evaluates: max17574 in 5v output-voltage application max17574 5v output evaluation kit www.maximintegrated.com
maxim integrated 3 regulator enable/undervoltage-lockout level (en/uvlo) the device offers an adjustable input undervoltage- lockout level. 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. set the voltage at which the device turns on with the resistive voltage-divider r1/r2 connected from vin_ to sgnd. connect the center node of the divider to en/uvlo. choose r1 to be 3.32m and then calculate r2 as follows: inu r1 1.215 r2 (v 1.215) = ? where v inu is the voltage at which the device is required to turn on. mode selection (mode/sync) the devices mode/sync pin can be used to select among pwm, pfm, or dcm modes of operation. the logic state of the mode/sync pin is latched when vcc and en/uvlo voltages exceed the respective uvlo rising thresholds and all internal voltages are ready to allow lx switching. state changes on the mode/sync pin are ignored during normal operation. refer to the max17574 ic data sheet for more information on the pwm, pfm, and dcm modes of operation. table 2 shows ev kit jumper settings that can be used to configure the desired mode of operation. external clock synchronization mode/sync) the internal oscillator of the device can be synchronized to an external clock signal on the sync pin. the external synchronization clock frequency must be between 1.1f sw and 1.4f sw , where f sw is the frequency of operation set by r3. the minimum external clock high pulse width should be greater than 50ns and the minimum external clock low pulse width should be greater than 160ns. *default position. *default position. table 1. regulator enable (en/uvlo) description (ju1) table 2. mode/sync description (ju2) shunt position mode/sync pin max17574_ mode not installed* unconnected pfm mode of operation 2-3 connected to sgnd pwm mode of operation 1-2 connected to vcc dcm mode of operation shunt position en/uvlo pin max17574_ output 1-2* connected to vin enabled not installed connected to the center node of resistor-divider r1 and r2 enabled, uvlo level set through the r1 and r2 resistors 2-3 connected to sgnd disabled evaluates: max17574 in 5v output-voltage application max17574 5v output evaluation kit www.maximintegrated.com
maxim integrated 4 figure 1. max17574 5v output load and line regulation (pwm mode) figure 2. max17574 5v output efficiency (pwm mode) figure 3. max17574 5v output load and line regulation (pfm mode) figure 4. max17574 5v output efficiency (pfm mode) ev kit test report 4 . 9 4 4 . 9 5 4 . 9 6 4 . 9 7 4 . 9 8 4 . 9 9 5 . 0 0 5 . 0 1 5 . 0 2 toc01 0 . 0 0 . 5 1 . 0 1 . 5 2 . 0 2 . 5 3 . 0 v i n = 36v v i n = 48v v i n = 24v v i n = 12v 4 . 7 5 4 . 8 4 . 8 5 4 . 9 4 . 9 5 5 5 . 0 5 5 . 1 5 . 1 5 5 . 2 5 . 2 5 toc02 0 . 0 0 . 5 1 . 0 1 . 5 2 . 0 2 . 5 3 . 0 v i n = 36v v i n = 48v v i n = 12v v i n = 24v 3 0 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 0 . 0 0 . 5 1 . 0 1 . 5 2 . 0 2 . 5 3 . 0 v i n = 4 8 v v i n = 3 6 v v i n = 2 4 v v i n = 1 2 v m o d e = s g n d t o c 0 3 6 0 6 5 7 0 7 5 8 0 8 5 9 0 9 5 1 0 0 0 . 0 0 . 1 1 . 0 e ff i c i e n c y ( %) v i n = 4 8 v v i n = 3 6 v v i n = 2 4 v v i n = 1 2 v m o d e = o p e n 3 . 0 t o c 0 4 evaluates: max17574 in 5v output-voltage application max17574 5v output evaluation kit www.maximintegrated.com
maxim integrated 5 figure 5. max17574 5v output efficiency (dcm mode) figure 6. max17574 5v output full load bode plot (v in = 24v) figure 7. max17574 5v output, no load to 1a load transient (pwm mode) figure 8. max17574 5v output, 5ma to 1a load transient (pfm mode) ev kit test report (continued) 3 0 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 0 . 0 0 . 1 1 . 0 v i n = 48v v i n = 36v v i n = 24v v i n = 12v m o d e = v c c toc05 gain (db) frequency (hz) max17574, 5v output, 3a load current, bode plot phase ( ) toc06 crossover frequency = 52.4khz, phase margin = 65.4 phase gain 100 s/div 100mv/div max17574, 5v output, pwm mode, (load current stepped from no load to 1.5a) v out ac 1a/div i lx toc07 2 m s / d i v 1 0 0 m v / d i v m a x 1 7 5 7 4 , 5 v o u t p u t , p f m m o d e , ( l o a d c u r r e n t s t e p p e d f r o m 5 m a t o 1 . 5 a ) v o u t a c 1 a / d i v i l x t o c 0 8 evaluates: max17574 in 5v output-voltage application max17574 5v output evaluation kit www.maximintegrated.com
maxim integrated 6 figure 9. max17574 5v output, 50ma to 1a load transient (dcm mode) figure 10. max17574 5v output, 1a to 2a load transient #denotes rohs compliant. note: indicate that you are using the max17574 when contacting these component suppliers. ev kit test report (continued) 1 a / d i v 2 0 0 s / d i v v o u t ( a c ) 1 0 0 m v / d i v m a x 1 7 5 7 4 , 5 v o u t p u t , d c m m o d e ( l o a d c u r r e n t s t e p p e d f r o m 5 0 m a t o 1 . 5 a ) i o u t m o d e = v c c toc09 100 s/div 100mv/div max17574, 3.3v output, pwm mode, (load current stepped from 1.5a to 3a) v out ac 1a/div i lx toc10 ordering information part type max17574evkitb# ev kit component suppliers supplier website coilcraft, inc. www.coilcraft.com murata americas www.murata.com panasonic corp. www.panasonic.com taiyo yuden www.t-yuden.com tdk corp. www.tdk.com evaluates: max17574 in 5v output-voltage application max17574 5v output evaluation kit www.maximintegrated.com
maxim integrated 7 max17574 5v ev system bill of materials ser i a l no. d escri p t ion q u a n t i t y d esign a t o r p a r t num b e r 1 2 . 2 f 1 0 %, 100v x 7 r ce r a m i c ca paci t o r ( 1210) 2 c 1 , c 2 m ura t a g r m 32er 72a225ka35 2 22f 1 0 %, 10v x 7 r ce r a m i c ca paci t o r ( 1210) 2 c 3 , c 4 m ura t a g r m 32er 71a226k 3 0 . 1 f 1 0 %, 50v x 7 r ce r a m i c ca paci t o r ( 0402) 2 c 5 , c 9 m ura t a g r m 155r 71h 104ke14 4 2 . 2 f 1 0 %, 10v x 7 r ce r a m i c ca paci t o r ( 0603) 1 c 6 m ura t a g r m 188r 71a225ke15 5 47uf, 80v e l e ct r o l y t i c ca paci t o r ( 6 . 3 mm. dia . ) 1 c 7 pan aso n i c eee- fk 1k470p 6 0 . 022f 1 0 %, 50v x 7 r ce r a m i c ca paci t o r ( 0402) 1 c 8 m ura t a g r m 155r 71h 223ka12 7 0 . 1 f 1 0 %, 100v x 7 r ce r a m i c ca paci t o r ( 0603) 1 c 1 1 m ura t a g r m 188r 72a104ka35 8 2 - p i n header ( 36- p i n header 0 . 1 ? ce n t e r s ) 2 ju 1 , ju 2 sullin s: pec 03saan 9 10uh i nduct o r ( 4 mm x 4 mm x 3 mm) 1 l 1 c o ilcr a ft x al8080- 103m e 1 0 3 . 3 m ohm 1 %, r e si st o r ( 0603) 1 r 1 any 1 1 604k ohm 1 %, r e si st o r ( 0603) 1 r 2 any 1 2 10k ohm 1 %, r e si st o r ( 0402) 1 r 4 any 1 3 4 . 7 ohm 1 %, r e si st o r ( 0402) 1 r 5 any 1 4 105k ohm 1 %, r e si st o r ( 0402) 1 r 6 any 1 5 22. 6 k ohm 1 %, r e si st o r ( 0402) 1 r 7 any 1 6 buck c onv e r t e r MAX17574ATG+ 1 u 1 MAX17574ATG+ 1 7 o pen 1 c 1 0 1 8 o pen 1 r 3 1 9 shunt 2 see t he j u m per t abl e s u lli n s s t c 02sy a n 2 0 t e st loops 8 v i n , s g nd, v o u t , p g nd1 , p g nd2 , r eset /, e n / u vlo, m o d e / s y n c 9020 b u ss w e i c o w i r e 2 1 m e d i u m b r o w n 9 3 / 8 ? x 7 1 / 4 ? x 2 1 / 2 1 pack - out 2 2 w eb i n st r u ct i ons f o r m a x i m d a t a sheet 1 pack - out 2 3 label 1 pack - out 2 4 bag; s t a t i c s h i eld 5 x 8 ; w / esd l ogo 1 pack - out 2 5 foa m , a n t i - s t a t i c pe 12? x 12? x 5 m m 1 pack - out 2 6 r ubber bum per s, 3 m s j- 5003 4 pack - out jumper shunt position ju1 1-2 ju2 2-3 for pwm and 1-2 for pfm mode jumper table evaluates: max17574 in 5v output-voltage application max17574 5v output evaluation kit www.maximintegrated.com
maxim integrated 8 pgnd pgnd 5v,3a c8 9 7 6 5 12 16 21 19 14 11 3 2 13 8 4 15 24 23 1 18 20 25 10 17 22 u1 c11 c3 r5 c9 sgnd en/uvlo vout 2 1 l1 vin mode/sync reset/ 3 2 1 ju1 3 2 1 ju2 r7 r6 r4 r3 r2 r1 c10 c4 c5 c6 2 1 c7 c2 c1 mode/sync 4.7 2.2uf 10k 22uf 22uf 0.1uf 2.2uf 2.2uf 0.1uf 604k max17574 open en/uvlo vcc vcc vcc vin sgnd pgnd 3.3m 0.022uf 0.1uf 10uh 22.6k 105k 47uf vout open + nc nc nc vin pgnd pgnd reset\ pgnd bst fb vin lx lx lx mode/sync cf sgnd rt vin vcc en/uvlo vin ss extvcc ep max17574 5v ev system schematic evaluates: max17574 in 5v output-voltage application max17574 5v output evaluation kit www.maximintegrated.com
maxim integrated 9 max17574 5v ev kitlayer 2 gnd max17574 5v ev kittop silkscreen max17574 5v ev kittop max17574 5v ev system pcb layout evaluates: max17574 in 5v output-voltage application max17574 5v output evaluation kit www.maximintegrated.com
maxim integrated 10 max17574 5v ev kitlayer 3 gnd max17574 5v ev kitbottom max17574 ev system pcb layout (continued) evaluates: max17574 in 5v output-voltage application max17574 5v output evaluation kit www.maximintegrated.com
? 2016 maxim integrated products, inc. 11 revision history revision number revision date description pages changed 0 12/16 initial release 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 specifcations without notice at any time. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. max17574 5v output evaluation kit evaluates: max17574 in 5v output-voltage application for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com.

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