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evaluates: max17558 max17558 dual-phase evaluation kit general description the max17558 dual-phase ev kit provides a proven design to evaluate the max17558 wide 4.5v to 60v input, dual-phase, synchronous step-down dc-dc controller. in 2-phase operation, the two channels of the max17558 are operated 180 out of phase. this interleaves the current pulses drawn by the 2 phases, and results in reduced total rms input current, which allows use of lesser number of input capacitors. the ev kit provides 3.3v/20a at the outputs from a 6v to 54v input supply. the switching frequency of the ev kit is preset to 350khz for optimal efficiency and component size. the ev kit features adjustable input undervoltage-lockout and soft-start time, selectable pwm/dcm modes, 180 out-of-phase/0 in- phase operation, current-limit threshold, and independent open-drain pgood signals. features 6v to 54v input range output rails: v out : 3.3v/20a 350khz switching frequency independent enable inputs independent adjustable soft-start time configurable tracking operation selectable pwm/dcm modes of operation selectable 180 out-of-phase/0 in-phase operation selectable current-limit threshold independent pgood outputs overcurrent, overvoltage, and overtemperature protection proven pcb layout fully assembled and tested quick start required equipment max17558 ev kit 6v to 54v 4.5v to 54v, 15a dc power supply loads capable of sinking 20a two digital voltmeters (dvm) procedure the ev kit is fully assembled and tested. follow the steps below to verify board operation. caution: do not turn on the power supply until all connections are completed. 1) ensure that the dc power supply is disabled. set the power supply voltage to 24v. 2) set the load to 20a. disable the load in the case of an electronic load. leave the load unconnected in the case of a resistor load and ensure that the resistor power rating is high enough to dissipate the output power. 3) connect the positive terminal of the power supply to the vin connector and the negative terminal of the power supply to pgnd connector, which is nearest to vin connector. 4) connect a digital voltmeter across vout connector and the nearest pgnd connector with the positive terminal of the dvm connected to vout connector. 5) verify the shunts on jumpers, as described in table 1 , to select default settings of the ev kit. 6) turn on the dc power supply. 7) verify that the digital voltmeter displays the expected voltage (3.3v1%). 8) enable the electronic load (connect the load in the case of resistor load). 9) verify that the voltmeter displays the expected voltage (3.3v1%). 19-7857; rev 0; 5/16 ordering information appears at end of data sheet. downloaded from: http:///
maxim integrated 2 www.maximintegrated.com evaluates: max17558 max17558 dual-phase evaluation kit detailed description of hardware the ev kit provides a proven design to evaluate the device. the ev kit provides 3.3v/20a at the outputs from 6v to 54v input supply. the ev kit is preset to operate at 350khz for optimum efficiency and component size. the ev kit provides set resistors r16, r17 and r18, r19 and jumpers ju4, ju5 to enable/disable the output at a desired input uvlo voltage. the dcm or pwm mode of operation can be selected using ju3. ju1 allows selection of 180/0 phase-shift operation between the two controllers. ju2 allows the selection of three different current-limit thresholds for both controllers. refer to table 2 through table 4 for additional jumper setting details. coniguring the output voltage (v out ) the devices output voltages (v out ) can be adjusted between 0.8v to 24v through sets of feedback resistor- dividers (r6, r7) by the following formula: out1 v 0.8 r6 r7 ( 1) = ? please refer to the max17558 ic data sheet to select r6 resistor values and change compensation components, as well as output capacitors, for new output voltage settings. soft-start (ss_) the device offers an ss_ pin used to adjust the soft-start time to limit inrush current during startup. an internal 5a current source charges the capacitor c21 at the ss_ pin, providing a linear ramping voltage for output voltage reference. the soft-start time of the output is calculated based on the following equation: ss_out1 0.8v t c21 5a = the default soft-start time on the ev kit is approximately 2.4ms. enable/undervoltage-lockout level (en_) the devices two controllers may be independently shut down/enabled using the en1 and en2 pins. the en_ pin can be programmed at 1.25v (typ) to detect the input undervoltage-lockout at a desired input voltage to enable/ disable the corresponding controller with 50mv (typ) hysteresis. connect a resistor-divider to en_ from v in to gnd to program the input undervoltage-lockout threshold to turn on/off the corresponding controller. for normal operation, the device is enabled whenever the input voltage is greater than 4.5v and ju4 and ju5 are open. set the voltage at which each controller turns on by placing a shunt across pins 1-2 on ju4 and ju5, and adjust the resistor-divider formed by r16, r17 for controller 1 and by r18, r19 for controller 2. table 2 shows the ev kits jumper settings for configuring the en_ pin. select r17 (r19) below 10k and calculate the r16 (r18) based on the following equation: inuvlo r17 (v 1.25) r16 1.25 ? = where v inuvlo is the input voltage at which the controller is required to turn on. mode selection (skip) the devices skip pin is used to select light-load operating mode among the pwm/dcm modes of operation. table 3 shows the ev kits jumper settings for configuring the desired light-load operating mode. phase shift between controllers ju1 can be configured to switch between 0 and 180 phase-shift of the devices two controllers. table 4 shows the jumper configurations to select the phase-shift between the two controllers. current-limit threshold selection (ju2) the current-limit threshold of both of the devices controllers can be selected using the ju2. table 5 shows the ev kit jumper settings for selecting the current-limit threshold. each controllers peak current limit can be adjusted independently by changing the values of r1 and r2. note that changing r1 and r2 values affect the stability and current-sense signal across the current sense pins. refer to the current sensing section of the max17558 ic data sheet for calculating the current-sense resistor value. switching frequency the devices switching frequency is set to 350khz by resistor r14. replace r14 with another value to set the switching frequency between 100khz to 2200khz. use the following equation to calculate r14 when reconfiguring the switching frequency: sw rt (f 133) r 8.8 + = where f sw is in khz and r14 is in k. downloaded from: http:///
maxim integrated 3 www.maximintegrated.com evaluates: max17558 max17558 dual-phase evaluation kit when reconfiguring the ev kits switching frequency, it may be necessary to change the loop-compensation networks components to new values. refer to the loop compensation section of the max17558 ic data sheet for computing new compensation component values. power-good outputs the ev kit provides power-good output test points (pgood1 and pgood2) to monitor the pgood1 and pgood2 signals. the pgood signals are pulled-up to vccint by r21 and r20. pgood1 and pgood2 are high when v out is within the 90%C110% range of their programmed output voltage. when v out is outside of the 90%C110% range of their programmed output voltage, pgood1 and pgood are pulled low. table 1. default setting of max17558 ev kit table 2. enable control (ju4, ju5) table 3. mode selection (ju3) table 4. phase-shift selection (ju1) table 5. peak current-limit threshold selection (ju2) jumper shunt position function ju1 unconnected conigure controller 1 and controller 2 180 out-of-phase operation ju2 1-2 select 75mv current-limit threshold ju3 1-2 select the pwm mode of operation ju4 unconnected enable controller 1 ju5 unconnected enable controller 2 jumper shunt position en max17558 output ju4 not installed unconnected enabled 1-2 connected to the midpoint of input uvlo divider enabled, uvlo level is set by theresistor divider from vin to gnd. 2-3 connected to gnd disabled ju5 not installed unconnected enabled 1-2 connected to the midpoint of input uvlo divider enabled, uvlo level is set by theresistor divider from vin to gnd. 2-3 connected to gnd disabled shunt position skip pin light-load operating mode 1-2 connected to vccint pwm mode 2-3 connected to vccint through a 100k resistor dcm mode shunt position sel_ph pin phase-shift 1-2 connected to vccint 0 not installed unconnected 180 shut position ilim pin peak current limit threshold 1-2 connected to vccint 75mv not installed unconnected 50mv 2-3 connected to gnd 30mv downloaded from: http:///
maxim integrated 4 www.maximintegrated.com evaluates: max17558 max17558 dual-phase evaluation kit 0 10 20 30 40 50 60 70 80 90 100 0 5000 10000 15000 20000 efficiency (%) output current (ma) efficiency vs. output current v out = 3.3v, pwm mode toc01 v in = 12v v in = 24v v in = 36v f sw = 350khz startup from input supply v in = 24v, v out = 3.3v, i out = 20a toc04 2ms/div 10a/div 1v/div v out i out -150 -120 -90 -60 -30 0 30 60 90 120 150 1k 10k 100k -50 -40 -30 -20 -10 0 10 20 30 40 50 phase margin ( ) gain (db) frequency (hz) closed- loop bode plot v in = 24v, v out = 3.3v, i out = 20a gain toc7 phase crossover frequency = 41.7 khz phase margin = 57 ? 40 50 60 70 80 90 100 0 5000 10000 15000 20000 efficiency (%) output current (ma) efficiency vs. output current v out = 3.3v, dcm mode toc02 v in = 12v v in = 24v v in = 36v f sw = 350khz startup into prebiased output v in = 24v, v out = 3.3v, i out = 0a toc05 2ms/div 10a/div 1v/div v out i out 0 2000 4000 6000 8000 10000 12000 0 5000 10000 15000 20000 i out 1/i out 2 (ma) output current (ma) current sharing v in = 24v, v out = 3.3v, pwm mode toc03 f sw = 350khz i out2 i out1 output ripple v in = 24v, v out = 3.3v, i out = 20a toc06 2s/div 10a/div 50mv/div vout iout ev kit performance report downloaded from: http:///
maxim integrated 5 www.maximintegrated.com evaluates: max17558 max17558 dual-phase evaluation kit note: indicate that you are using the max17558 when contacting these component suppliers. supplier website wurth elektronik www.we-online.com renesas electronics am.renesas.com murata americas www.murata.com panasonic electronic components www.panasonic.com/industrial vishay dale www.vishay.com tdk corp. www.tdk.com rubycon corp. www.rubycon.com tt electronics/welwyn www.welwyn-tt.com #denotes rohs compliant. part type MAX17558DPEVKIT# ev kit component information, pcb layout, and schematic see the following links for component information, pcb layout diagrams, and schematic. max17558dp ev bom max17558dp ev pcb layout max17558dp ev schematic ordering information component suppliers 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. ? 2016 maxim integrated products, inc. 6 evaluates: max17558 max17558 dual-phase evaluation kit revision number revision date description pages changed 0 5/16 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:///
designation qty description c1 1 150uf,80v panasonic electronic eev-fk1k151q c2-c9, 8 cap cer 4.7uf 80v 10% x7r 1210 murata grm32er71k475me14 c10, c11, c14, c15 4 180uf,6.3v rubycon 6sw180m c12, c13, c16, c17 4 10uf,10v,x7r,1210,10% murata grm32dr71a106ka01 c18 1 1uf,100v,x7r,0805,10% t dk c2012x7s2a105k125 c19, c31, c32 3 cap cer 1uf 16v 10% x7r 0603 kemet c0603c105k4rac /murata grm188r71c105ka12/tdk c1608x7r1c105k/taiyo yuden emk107b7105ka c20 1 10uf,10v,x7r,0805,10% murata grm188r71c153ka01 c21 1 0.015uf,10v(16v),10%,x7r, 0603 murata grm188r71c153ka01 c22 1 0.012uf,10v(16v),10%,x7r, 0603 murata grm188r71c123ka01 c23 1 120pf,50v,cog,10%,0603 kemet c0603c121k5gac c24-c27 4 1nf,16v,x7r,0603,10% murata grm188r71c102ka01 c28 1 1uf,100v,x7r,1206,10% murata grm31cr72a105ka01l/tdk c3216x7r2a105k160 c29 1 0.22uf,25v,x7r,0603,10% kemet c0603c224k3rac/ murata grm188r71e224ka88/ c30 1 10uf,10v,x7r,10%,1206 murata grm31cr71a106ka01l r1,r2 2 5m, 1.5w,1%,2010 tt electronics lrmat2010-r005f r3, r5, r10,r11 4 0 1% resistor (0603) r6,r15 2 100k 1% resistor (0603)
r7 1 32.4k 1% resistor (0603) r8 1 8.06k ? 1% resistor (0603) r9,r12 2 1 1% resistor (0603) r13, r22, r24, r29, r31, r32 6 0 1% resistor (0603) r14 1 53.6k 1% resistor (0603) r20,r21 2 10k 1% resistor (0603) r25 1 69.8k 1% resistor (0603) r26 1 22.1 1% resistor (0603) r27 1 324k 1% resistor (0603) r28 1 49.9k 1% resistor (0603) r33 1 2.2 1% resistor (0603) l1,l2 2 2.2h, 11.5a inductor , wurth electronics 7447709002 l3 1 100h, 0.19a inductor , coil craft lps3015-104mr q1, q3, q5, q7 4 60v, 25a n-channel mosfet (lfpak) renesas rjk0651dpb-00#j5 q2, q4, q6, q8 4 60v, 45a mosfet (lfpak) renesas rjk0653dpb-00#j5 d1,d2 2 100v schottky diode (powerdi 123) diodes incorporated dfls 1100-7 u1 1 wide 4.5v to 60v input, dual output, step-down dc-dc controller (32 tqfn-ep) maxim u2 1 ultra-small; high-efficiency; synchronous step-down dc-dc converter with 22ua no-load supply current; en1, en2, gnd, vin, pgnd, vout, pgnd3, pgood1, pgood2, track1, track2, vccint 12 20g tinned copper bus wire formed into u shaped loops (0.25 off the pc board) ju1 1 2-pin header ( 0.1 pitch) ju2, ju3,ju4,ju5 4 3-pin header ( 0.1 pitch) sullins prec003saan-rc vin,pgnd,vout1,pgnd,vout2,pgnd 6 non -insulate jack keystone electronics 575-4 c33, c34 2 open r4, r16-r19, r23, r30 7 open
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6v to 54v 3.3v@20a 12 3 5 4 12 3 5 4 12 3 5 4 1 2 2 1 12 3 5 4 12 3 5 4 12 3 5 4 12 3 5 4 c a c a 12 3 5 4 0.012uf gnd 10k 31 r21 1uf q1 dl1 2316 1 r9 vccint r12 0 c18 10uf c20 r7 vout 0.005 0.22uf c29 vout 9 100uh l3 r26 2.2 vccext r33 c30 10uf 22.1 6 pgnd 10 0.015uf pgnd pgnd u2 max17552aatb+ pgnd 69.8k c13 vout 3 4.7uf pgnd 1uf 4.7uf pgnd c32 1uf vccint pgood2 53.6k 2.2uh 2 cs1- cs1+ ss1 0 0 open vin 575-4 tp8 pgnd 8 1 c12 10uf c11 1 c10 180uf 180uf tp7 1 pgnd tp5575-4 150uf c1 575-4 tp6 vin pgnd3 575-4 cs2- q4 0 gnd gnd 0 fb1 11 d2 vccint gnd fb1 cs1+ vccint ju1 r15 100k cs2+ cs2- 32.4k 5 cs1- 1000pf gnd r24 ss2 r31 r22 r23 open gnd open c33 1000pf vin 33 18 10 comp1 cs2+ c22 c14 c9 13 r32 2 ju3 gnd 15 14 12 2 gnd r20 c6 2.2uh q5 vccint q8 q6 r10 24 2 21 pgnd c25 c5 4.7uf 22 vin open 7 ju5 c27 gnd pgnd open r16 open 1 1 3 q3 vccint ju2 19 68 29 r30 vout ju4 r14 3 10uf ss1 2 q7 r19 2 3 4.7uf u1 4.7uf 4.7uf 0 26 vccint 9 1 r3 c7 2 c16 2 1 en1 gnd 3 track1 3 pgood1 gnd c17 0 r29 c21 r5 0 2 1 180uf l1 r13 r6 100k 180uf 2 10uf c15 2 4.7uf 2 en2 d1 open pgnd 1 pgnd 25 4 l2 0 r17 vin track2 open r18 1 gnd gnd 1 10uf c3 r1 prec003saan-rc 1 vccint c8 2 1 gnd c2 c4 4.7uf 2 gnd c26 1000pf c28 vin vin r27 324k pgnd r25 4 7 49.9k r28 pgnd 5 vccint vccint vccext vout r4 20 32 c24 1000pf gnd pgnd vccint 1 10k lx1 q2 0.005 r2 1 c31 1uf c23 8.06k gnd open c34 r8 c19 1uf comp1 120pf 3028 27 max17558 17 r11 0 s d g s d g s d g + in ep lx gnd mode reset vout rt/sync en/uvloss fb s d g s d g s d g s d g + + + + s d g comp2 comp1 ep ilim in pgnd vccext vccint dl2 dl1 bst2 bst1 lx2 lx1 dh2 dh1 pgood2 pgood1 ss2 ss1 fb2 fb1 cs2+ cs1+ en2 en1 gnd skip test sel_ph rt cs2- cs1- downloaded from: http:///

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