MAX17558DPEVKIT#

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° inphase operation, current-limit threshold, and independent open-drain PGOOD signals. Features ●● 6V to 54V Input Range ●● Output Rails: VOUT: 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 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. ●● Selectable Current-Limit Threshold 5) Verify the shunts on jumpers, as described in Table 1, to select default settings of the EV kit. ●● Independent PGOOD Outputs 6) Turn on the DC power supply. ●● Overcurrent, Overvoltage, and Overtemperature Protection 7) Verify that the digital voltmeter displays the expected voltage (3.3V±1%). ●● Proven PCB Layout 8) Enable the electronic load (connect the load in the case of resistor load). ●● Fully Assembled and Tested Ordering Information appears at end of data sheet. 19-7857; Rev 0; 5/16 9) Verify that the voltmeter displays the expected voltage (3.3V±1%). MAX17558 Dual-Phase Evaluation Kit Evaluates: MAX17558 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. Configuring the Output Voltage (VOUT) The device’s output voltages (VOUT) can be adjusted between 0.8V to 24V through sets of feedback resistordividers (R6, R7) by the following formula: R7 = R6 V ( OUT1 − 1) 0.8 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 5µA 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: t ss_OUT1 = C21× 0.8V 5µA The default soft-start time on the EV kit is approximately 2.4ms. Enable/Undervoltage-Lockout Level (EN_) The device’s 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 VIN to GND to program the input undervoltage-lockout threshold to turn on/off the corresponding controller. www.maximintegrated.com 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 kit’s jumper settings for configuring the EN_ pin. Select R17 (R19) below 10K and calculate the R16 (R18) based on the following equation: R16 = R17 × (VINUVLO − 1.25) 1.25 Where VINUVLO is the input voltage at which the controller is required to turn on. Mode Selection (SKIP) The device’s SKIP pin is used to select light-load operating mode among the PWM/DCM modes of operation. Table 3 shows the EV kit’s 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 device’s 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 device’s controllers can be selected using the JU2. Table 5 shows the EV kit jumper settings for selecting the current-limit threshold. Each controller’s 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 device’s 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: R RT = (f SW + 133) 8.8 Where FSW is in kHz and R14 is in KΩ. Maxim Integrated │  2 MAX17558 Dual-Phase Evaluation Kit Evaluates: MAX17558 Power-Good Outputs When reconfiguring the EV kit’s switching frequency, it may be necessary to change the loop-compensation network’s components to new values. Refer to the Loop Compensation section of the MAX17558 IC data sheet for computing new compensation component values. 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 VOUT is within the 90%–110% range of their programmed output voltage. When VOUT is outside of the 90%–110% range of their programmed output voltage, PGOOD1 and PGOOD are pulled low. Table 1. Default Setting of MAX17558 EV kit JUMPER SHUNT POSITION FUNCTION JU1 Unconnected Configure 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 Table 2. Enable Control (JU4, JU5) JUMPER JU4 JU5 SHUNT POSITION EN MAX17558 OUTPUT Not installed Unconnected Enabled 1-2 Connected to the midpoint of input UVLO divider Enabled, UVLO level is set by the resistor divider from VIN to GND. 2-3 Connected to GND Disabled Not installed Unconnected Enabled 1-2 Connected to the midpoint of input UVLO divider Enabled, UVLO level is set by the resistor divider from VIN to GND. 2-3 Connected to GND Disabled Table 3. Mode Selection (JU3) 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 Table 4. Phase-Shift Selection (JU1) SHUNT POSITION SEL_PH PIN PHASE-SHIFT 1-2 Connected to VCCINT 0° Not installed Unconnected 180° Table 5. Peak Current-Limit Threshold Selection (JU2) SHUT POSITION ILIM Pin PEAK CURRENT LIMIT THRESHOLD 1-2 Connected to VCCINT 75mV Not installed Unconnected 50mV 2-3 Connected to GND 30mV www.maximintegrated.com Maxim Integrated │  3 MAX17558 Dual-Phase Evaluation Kit Evaluates: MAX17558 EV Kit Performance Report 100 100 90 70 EFFICIENCY (%) EFFICIENCY (%) 80 60 50 VIN = 12V 40 VIN = 24V VIN = 36V 30 20 10000 80 8000 VIN = 12V 70 VIN = 24V 60 FSW = 350kHz 0 5000 10000 15000 40 20000 STARTUP FROM INPUT SUPPLY VIN = 24V, VOUT = 3.3V, IOUT = 20A VIN = 36V 0 5000 10000 15000 IOUT1 6000 IOUT2 4000 0 20000 OUTPUT CURRENT (mA) FSW = 350kHz 0 5000 10000 15000 20000 OUTPUT CURRENT (mA) STARTUP INTO PREBIASED OUTPUT VIN = 24V, VOUT = 3.3V, IOUT = 0A toc04 toc03 2000 FSW = 350kHz OUTPUT CURRENT (mA) CURRENT SHARING VIN = 24V, VOUT = 3.3V, PWM MODE 12000 90 50 10 0 EFFICIENCY vs. OUTPUT CURRENT VOUT = 3.3V, DCM MODE toc02 IOUT1/IOUT2 (mA) EFFICIENCY vs. OUTPUT CURRENT VOUT = 3.3V, PWM MODE toc01 OUTPUT RIPPLE VIN = 24V, VOUT = 3.3V, IOUT = 20A toc05 1V/div 1V/div toc06 50mV/div VOUT VOUT VOUT 10A/div IOUT 10A/div IOUT IOUT 2ms/div 2ms/div 2µs/div CLOSED-LOOP BODE PLOT VIN = 24V, VOUT = 3.3V, IOUT = 20A 40 150 120 PHASE 30 toc7 90 20 60 10 30 0 0 GAIN -10 -20 -30 -60 CROSSOVER FREQUENCY = 41.7 kHz PHASE MARGIN = 57◦ -30 -90 -120 -40 -50 PHASE MARGIN (°) 50 GAIN (dB) 10A/div 1k 10k 100k -150 FREQUENCY (Hz) www.maximintegrated.com Maxim Integrated │  4 MAX17558 Dual-Phase Evaluation Kit Evaluates: MAX17558 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 Note: Indicate that you are using the MAX17558 when contacting these component suppliers. 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 www.maximintegrated.com Ordering Information PART TYPE MAX17558DPEVKIT# EV kit #Denotes RoHS compliant. Maxim Integrated │  5 MAX17558 Dual-Phase Evaluation Kit Evaluates: MAX17558 Revision History REVISION NUMBER REVISION DATE 0 5/16 DESCRIPTION Initial release PAGES CHANGED — 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. 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. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2016 Maxim Integrated Products, Inc. │  6 Designation C1 Qty Description C21 1 150uF,80V Panasonic Electronic EEV-FK1K151Q 8 CAP CER 4.7UF 80V 10% X7R 1210 Murata GRM32ER71K475ME14 4 180uF,6.3V RUBYCON 6SW180M 4 10uF,10V,X7R,1210,10% Murata GRM32DR71A106KA01 1uF,100V,X7R,0805,10% 1 TDK C2012X7S2A105K125 3 CAP CER 1UF 16V 10% X7R 0603 KEMET C0603C105K4RAC /MURATA GRM188R71C105KA12/TDK C1608X7R1C105K/TAIYO YUDEN EMK107B7105KA 1 10uF,10V,X7R,0805,10% Murata GRM188R71C153KA01 0.015uF,10V(16V),10%,X7R, 0603 1 C22 1 C23 1 120pF,50V,COG,10%,0603 KEMET C0603C121K5GAC 4 1nF,16V,X7R,0603,10% Murata GRM188R71C102KA01 1 1uF,100V,X7R,1206,10% MURATA GRM31CR72A105KA01L/TDK C3216X7R2A105K160 1 0.22uF,25V,X7R,0603,10% KEMET C0603C224K3RAC/ MURATA GRM188R71E224KA88/ 1 10UF,10V,X7R,10%,1206 Murata GRM31CR71A106KA01L 2 5mΩ, 1.5W,1%,2010 TT Electronics LRMAT2010-R005F 4 0Ω ±1% resistor (0603) 2 100KΩ ±1% resistor (0603) C2-C9, C10, C11, C14, C15 C12, C13, C16, C17 C18 C19, C31, C32 C20 C24-C27 C28 C29 C30 R1,R2 R3, R5, R10,R11 R6,R15 Murata GRM188R71C153KA01 0.012uF,10V(16V),10%,X7R, 0603 Murata GRM188R71C123KA01 R7 R8 R9,R12 R13, R22, R24, R29, R31, R32 R14 R20,R21 R25 R26 R27 R28 R33 L1,L2 L3 Q1, Q3, Q5, Q7 1 1 2 6 1 2 1 1 1 1 1 2 1 4 Q2, Q4, Q6, Q8 4 D1,D2 2 U1 1 U2 1 EN1, EN2, GND, VIN, PGND, VOUT, PGND3, PGOOD1, PGOOD2, TRACK1, TRACK2, VCCINT JU1 JU2, JU3,JU4,JU5 12 VIN,PGND,VOUT1,PGND,VOUT2,PGND 6 C33, C34 R4, R16-R19, R23, R30 2 7 1 4 32.4KΩ ±1% resistor (0603) 8.06KΩ ±1% resistor (0603) 1Ω ±1% resistor (0603) 0Ω ±1% resistor (0603) 53.6KΩ ±1% resistor (0603) 10KΩ ±1% resistor (0603) 69.8KΩ ±1% resistor (0603) 22.1Ω ±1% resistor (0603) 324KΩ ±1% resistor (0603) 49.9KΩ ±1% resistor (0603) 2.2Ω ±1% resistor (0603) 2.2μH, 11.5A Inductor , Wurth Electronics 7447709002 100μH, 0.19A Inductor , COIL CRAFT LPS3015-104MR 60V, 25A N-Channel MOSFET (LFPAK) Renesas RJK0651DPB-00#J5 60V, 45A MOSFET (LFPAK) Renesas RJK0653DPB-00#J5 100V Schottky Diode (POWERDI 123) Diodes Incorporated DFLS 1100-7 Wide 4.5V to 60V Input, Dual Output, Step-Down DC-DC Controller (32 TQFN-EP) Maxim ULTRA-SMALL; HIGH-EFFICIENCY; SYNCHRONOUS STEP-DOWN DC-DC CONVERTER WITH 22uA NO-LOAD SUPPLY CURRENT; 20G tinned copper Bus wire formed into “U” shaped loops (0.25” off the PC board) 2-pin header ( 0.1” pitch) 3-pin header ( 0.1” pitch) Sullins PREC003SAAN-RC Non -Insulate Jack Keystone Electronics 575-4 OPEN OPEN 0 3 1 VIN R18 R19 OPEN OPEN COMP1 A R27 324K PGND R28 MODE EP PGND RESET 7 PGND PGND CS1+ CS1- 1 2 3 1 2 3 VOUT R1 2 TP7 575-4 0.005 + C10 180UF C11 180UF C12 10UF 3.3V@20A C13 10UF PGND 1 2 3 1 2 3 2 G S VOUT 1 1 Q4 + 5 5 L1 2.2UH 2 R12 C D Q8 4 VCCINT 2.2UH 2 R2 2 10UF C17 PGND 10UF VOUT VIN 0.005 4 G S D VIN CS2- G S D Q5 Q7 VIN CS2+ C1 150UF 10K 2 SS1 C15 180UF C16 1 2 3 5 1 L2 C14 180UF + G S + D 2 1 2 3 4 G S 1 4 1 C9 4.7UF C8 4.7UF 1 4.7UF PGND GND OPEN PGOOD2 PGND 6V TO 54V TP5 575-4 PGND3 PGND 2 R23 TP6 575-4 C6 C7 4.7UF 0 TRACK2 PGND 49.9K Q3 Q6 0 2.2 10UF TP8 575-4 GND R31 5 VCCEXT 1 4 1 2 3 EP R11 R32 VCCINT GND GND D G S 5 JU5 22.1 C30 1UF R9 SS2 FB SS G S Q2 0 2 R26 R33 2 C32 VCCINT GND R22 EN2 5 5 VCCEXT 19 VCCINT 20 VCCEXT 16 4 G S D 4 D2 CS2+ GND 6 1 R21 10K 28 27 PGOOD1 LX2 LX1 DL1 R20 OPEN VOUT RT/SYNC PGND 1 1UF R17 OPEN GND 18 33 3 CS2- R16 9 69.8K PGND C31 FB1 JU4 1 VIN 29 C33 OPEN 0 2 SS1 1000PF 3 4 R25 4.7UF 5 R24 C2 4.7UF 4.7UF D 1 2 3 EN1 DL2 R10 Q1 C C27 0 0 GND 21 4 A C26 PGND U1 BST2 EN2 23 DH2 8 DL1 MAX17558 17 EN1 25 15 GND 7 LX1 PGOOD2 6 26 14 SKIP DH1 SS2 5 24 D 5 TEST R15 100K OPEN R4 4 1000PF GND 1 2 3 SEL_PH BST1 13 1000PF RT 3 IN 22 COMP2 JU3 EN/UVLO D1 R3 1UF 12 VCCINT C25 2 PGND C18 FB2 53.6K ILIM CS1- COMP1 1 R14 GND GND 30 31 CS1+ FB1 32 10UF CS2+ GND OPEN VCCINT C20 11 1000PF CS1- 2 8 PGND CS2- C24 120PF C3 C19 1UF 9 0 CS1+ R13 GND C23 C4 4.7UF COMP1 C34 VCCINT C5 10 32.4K GND 8.06K R8 R7 1 2 VIN GND L3 100UH 0.22UF 0 GND GND VCCINT PGND C22 0.012UF JU1 10 1 GND SS1 0.015UF FB1 LX C29 C21 100K IN 1UF VOUT 1 2 3 R29 R6 1 JU2 PREC003SAAN-RC OPEN 0 U2 MAX17552AATB+ C28 R30 R5 VIN VCCINT VCCINT VCCINT VOUT VCCINT 1 PGOOD1 + TRACK1