MAX20028EVKIT#

Click here for production status of specific part numbers. MAX20028 Evaluation Kit General Description The MAX20028 evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB that contains all the components necessary to evaluate the MAX20028 power-management IC (PMIC). The EV kit includes one high-voltage step-down controller and two low-voltage step-down converters. The EV kit can operate from 3.5V to 36V input voltages and is optimized for automotive infotainment applications. The high-voltage controller is configured for a 5V output that provides at least 5A. The low-voltage step-down converters are configured for 3.3V and 1.2V, each providing up to 3A. The EV kit can be easily reconfigured to operate in continuous PWM mode, skip mode, or external synchronization operation. The EV kit comes with MAX20028ATJA/VY+ device installed, but is capable of evaluating other variants of the MAX20028 IC. Refer to the MAX20028 IC data sheet for external component selection. Evaluates: MAX20028 Features ● 3.5V to 36V Input Range ● 20µA Quiescent Current with DC-DC Controller Enabled ● Output Voltages • 5V Output at 5A (High-Voltage, Step-Down Controller, Buck 1) • 3.3V Output at 3A (Step-Down Converter, Buck 2) • 1.2V Output at 3A (Step-Down Converter, Buck 3) ● High-Frequency Operation • 2.1MHz or Optional Divide-Down Operation for Buck 1 ● Individual Enable Inputs and Reset Outputs ● Proven PCB Layout ● Fully Assembled and Tested Ordering Information appears at end of data sheet. 319-100219A; Rev 1; 2/19 MAX20028 Evaluation Kit Quick Start Recommended Equipment ● MAX20028 EV kit ● 3.5V to 36V, 4A DC power supply ● Voltmeter 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) Verify that a shunt is installed across pins 1-2 on jumpers JU1–JU3 and JU5–JU7. 2) Verify that a shunt is installed across pins 2-3 on jumper JU4. 3) Connect the positive terminal of the power supply to the VBAT PCB pad. Connect the negative terminal of the power supply to the PGND PCB pads closest to VBAT. 4) Set the power-supply VIN to 14V. 5) Turn on the power supply and verify that the Buck 1 output (VOUT1) is 5V. 6) Verify that the Buck 2 output (VOUT2) is 3.3V. 7) Verify that the Buck 3 output (VOUT3) is 1.2V. Detailed Description of Hardware The MAX20028 EV kit comes fully assembled and tested with all the components necessary to evaluate the MAX20028 step-down controller with dual 2.1MHz step-down DC-DC converters. The EV kit comes with a MAX20028ATJA/VY+ 32-pin side-wettable TQFN-EP device installed. However, other MAX20028 variants can be evaluated on the same EV kit with some simple modifications. Refer to the MAX20028 IC data sheet for additional information regarding component selection when altering the EV kit. High-Voltage Controller, Buck 1 Buck 1 is a high-voltage, step-down controller designed to operate with a 3.5V to 36V input voltage range. Buck 1 is configured for a 5V output and up to 5A load current. To change the Buck 1 output voltage to a fixed 3.3V, remove R7 and populate R6 with a 0Ω resistor. The Buck 1 switching frequency can be configured for 2.1MHz or the factory-trimmed divide-down frequency of www.maximintegrated.com Evaluates: MAX20028 420kHz. By default, Buck 1 is configured to operate at 2.1MHz. To change the Buck 1 switching frequency to 420kHz, remove R22 and populate R21 with a 0Ω resistor. The switching frequencies of Buck 2 and Buck 3 are not affected by the CSEL1 input. For additional information, refer to the Buck 1 Clock Select (CSEL1) section in the MAX20028 IC data sheet. Low-Voltage Converters, Buck 2 and Buck 3 Buck 2 and Buck 3 are low-voltage, synchronous stepdown converters designed to operate directly from the Buck 1 output. Buck 2 is configured for a 3.3V output and Buck 3 is configured for a 1.2V output. Both Buck 2 and Buck 3 have a maximum output current of 3A. The output voltages are configurable between 0.8V and 3.6V by resistor-dividers. Refer to the OUT2/OUT3 Adjustable Output-Voltage Option section in the MAX20028 IC data sheet for additional information. Spread-Spectrum Operation (JU4) The EV kit features a pin-selectable spread-spectrum mode of operation. Jumper JU4 enables or disables spread-spectrum operation (see Table 1). Synchronization Input (JU5) The EV kit’s SYNC input allows synchronization to an external clock. When synchronizing the device to an external clock, leave jumper JU5 unconnected. For fixedfrequency PWM mode operation, connect a shunt across pins 1-2 on JU5. For skip mode operation, connect a shunt across pins 2-3 on JU5. Reset Outputs The EV kit features individual RESET_ outputs for each buck that assert low when the buck output drops 6% below the regulated voltage. RESET_ remains low for a fixed timeout period of 3.9ms after the buck output rises up to its regulated voltage. RESET1 has a pullup resistor, making it a logic-level output. RESET2 and RESET3 are either logic-level or open-drain outputs, depending on jumpers JU6 and JU7 (see Table 1). Thermal Warning The EV kit features a thermal-warning indicator output. The ERR output asserts low when the junction temperature on the IC exceeds +145°C (typ). The thermal-warning indicator has a typical hysteresis of 15°C. Maxim Integrated │  2 MAX20028 Evaluation Kit Evaluates: MAX20028 Table 1. Jumper Descriptions (JU1–JU7) SHUNT POSITION JUMPER JU1 JU2 JU3 JU4 1-2* Connects EN1 to VBAT through a pullup resistor (normal operation). 2-3 Connects EN1 to PGND (shutdown). 1-2* Connects EN2 to BIAS (Buck 2 enabled). 2-3 Connects EN2 to PGND (Buck 2 disabled). 1-2* Connects EN3 to BIAS (Buck 3 enabled). 2-3 Connects EN3 to PGND (Buck 3 disabled). 1-2 Connects SSEN to BIAS, enabling spread-spectrum operation. 2-3* Connects SSEN to PGND, disabling spread-spectrum operation. 1-2* Connects SYNC to BIAS to enable continuous PWM mode. 2-3 Connects SYNC to PGND to enable skip mode under light-load conditions. JU5 Open Closed* JU6 Open Closed* JU7 DESCRIPTION Open When SYNC is unconnected, or when a clock source is present, continuous PWM mode is enabled. SYNC can be used to synchronize with other supplies when a clock source is present. Connects RESET2 to VOUT1 through a pullup resistor, making the RESET2 output a logic level signal. Disconnects RESET2 from VOUT1, leaving RESET2 as an open-drain output. Connects RESET3 to VOUT1 through a pullup resistor, making RESET3 output a logic level signal. Disconnects RESET3 from VOUT1, leaving RESET3 as an open-drain output. *Default position. Component Suppliers SUPPLIER PHONE WEBSITE AVX Corp. 864-967-2150 www.avx.com Coilcraft Inc. 847-639-6400 www.coilcraft.com Diodes Incorporated 805-446-4800 www.diodes.com Fairchild Semiconductor 888-522-5372 www.fairchildsemi.com Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com NXP Semiconductors 408-474-8142 www.nxp.com Panasonic Corp. 800-344-2112 www.panasonic.com TDK Corp. 847-803-6100 www.component.tdk.com Vishay Dale 402-563-6866 www.vishay.com Note: Indicate that you are using the MAX20028 when contacting these component suppliers. Ordering Information PART MAX20028EVKIT# TYPE EV Kit #Denotes RoHS compliant. www.maximintegrated.com Maxim Integrated │  3 MAX20028 Evaluation Kit Evaluates: MAX20028 MAX20028 EV Kit Bill of Materials DESIGNATION QTY C1 1 DESCRIPTION 2.2uF 10%, 50V X7R ceramic capacitor (0805), TDK C2012X7R1H225K C2 1 1uF 10%, 50V X7R ceramic capacitor (0805), TDK C2012X7R1H105K C3, C4, C6, C7, C16 5 0.1uF 10%, 50V X7R ceramic capacitor (0603), MURATA GCM188R71H104K C5 1 220uF 20%, 50V aluminum electrolytic capacitor (Case size H13), Panasonic EEV-TG1H221Q C9-C12 C13 C14 C15 C17 C18, C22 C19, C20, C23, C24 C21 C25 C27 D1 D2 FB1 FB2, FB3 JU1-JU5 JU6, JU7 L1 L2 L3 N1, N2 R1-R4, R7, R20, R22 R5, R6, R21 R8 R9-R11, R13 R12, R14 R15 R16 R17 R18 R19 RCS TP1-TP3 4 0 1 1 1 2 4 1 1 1 1 1 1 2 5 2 1 1 1 2 7 0 1 4 2 1 1 1 1 1 1 3 U1 1 - 7 1 47uF 20%, 10V X7R ceramic capacitor (1210), Murata GRM32ER71A476K Not installed, ceramic capacitor (0402) 120pF 10% 50V ceramic capacitor (0402), AVX 04025C121KAT2A 1.5nF 10% 50V ceramic capacitor (0402), TDK C1005X7R1H152K 1uF 10%, 16V X7R ceramic capacitor (0603), MURATA GCM188R71C105K 10uF 10%, 6.3V X7R ceramic capacitor (0805), MURATA GCM21BR70J106K 47uF 10%, 6.3V X7R ceramic capacitor (1210), MURATA GRM32ER70J476KE20L 20pF 50V C0G ceramic capacitor (0402), MURATA GRM1555C1H200J 10pF 50V C0G ceramic capacitor (0402), MURATA GRM1555C1H100J 4.7uF 10%, 50V X7R ceramic capacitor (1210), MURATA GCM32ER71H475K switching diode SOD-323, Diodes inc. 1N4148WS 5A low VF MEGA Schottky barrier rectifier, NXP PMEG3050EP Ferrite Bead, 60 ohm, 600mA, Murata BLM41PG600SH1 Not installed, ferrite beads, short (PCB trace) 3 pin header, 2.54MM, 2 pin header, 2.54MM, 1.2uH, 12.5A inductor, Coilcraft XAL5030-122ME 1.0µH, 8.7A inductor, Coilcraft XAL4020-102ME 0.6µH, 10.4A inductor, Coilcraft XAL4020-601ME 40V, 18A, 26m ohm N-Channel Power Trench MOSFET, Fairchild FDMC8015L 0 ohm, +/-5% resistors (0402) Not installed, resistors (0402) 22k ohm 1% (0402), Panasonic ERJ-2RKF2202X 5.1k ohm, 5% tolerance (0402) 100k ohm, 5% tolerance (0603) 10 ohm, 1% tolerance (0402) 10k ohm, 1% tolerance (0402) 20k ohm, 1% tolerance (0402) 75k ohm, 1% tolerance (0402) 24k ohm, 1% tolerance (0402) 15m ohm, 1W, 1% (1206), Vishay Dale WSL1206R0150FEA PCB Miniature test points Step-Down Controller with Dual 2.1MHz Step-Down DC-DC Converters (32 TQFN-EP), MAX20028ATJA/VY+ Shunts PCB: MAX20028 EVKIT www.maximintegrated.com Maxim Integrated │  4 RESET3 RESET2 RESET1 PGND VOUT1 PGND VBAT D2 C12 47uF C7 0.1uF 50V 1 1 R11 5.1k 2 JU6 2 FB1 C11 47uF C6 0.1uF 50V R10 5.1k VOUT1 JU7 VOUT1 VBAT R9 5.1k VOUT1 C10 47uF C4 0.1uF 50V C5 220uF 50V BIAS R7 0 TP1 1 TP-SMALL C9 47uF VOUT1 + R6 OPEN R5 OPEN R20 0 RCS 15m 1% C3 0.1uF D1 C13 OPEN L1 1.2uH BIAS SYNC ERR 1 JU4 2 3 BIAS N1 N2 R22 0 1 JU2 2 3 4 4 JU5 2 1 3 BIAS R14 100k BIAS 1% C14 120pF R8 R2 0 R1 0 C2 1uF C1 2.2uF R21 OPEN BIAS 22k 1 JU3 2 3 VBAT C15 1.5nF BIAS R12 100k R13 5.1k VOUT1 1 JU1 2 3 C27 4.7uF BIAS 5 6 7 8 1 2 3 5 6 7 8 www.maximintegrated.com 1 2 3 PGND 32 26 27 31 15 14 8 17 24 28 30 11 13 12 3 2 4 5 7 6 9 29 SYNC CSEL1 SSEN ERR EN3 EN2 EN1 RESET3 RESET2 RESET1 COMP1 FB1 OUT1 CS1 PGND1 DL1 LX1 DH1 VSUP BST1 BIAS GND U1 EP MAX20028 OUT2 PGND2 LX2 PV2 OUT3 PGND3 LX3 PV3 PV PV1 25 21 22 23 16 20 19 18 10 1 BIAS TP3 L3 0.6uH C18 10uF TP-SMALL 1 TP2 L2 1uH C22 10uF R19 24k 1% R18 75k 1% R4 0 1% FB2 VOUT1 SHORT (PC TRACE) R17 20k 1% R16 10k 1% R3 0 1% FB3 VOUT1 SHORT (PC TRACE) C17 1uF R15 10 1% C16 0.1uF TP-SMALL 1 BIAS C25 10pF C24 47uF C21 20pF C20 47uF C23 47uF C19 47uF PGND VOUT2 PGND VOUT3 MAX20028 Evaluation Kit Evaluates: MAX20028 MAX20028 EV Kit Schematic Maxim Integrated │  5 MAX20028 Evaluation Kit Evaluates: MAX20028 MAX20028 EV Kit PCB Layout MAX20028 EV Kit Component Placement Guide—Component Side MAX20028 EV Kit PCB Layout—Component Side MAX20028 EV Kit PCB Layout—Layer 2 www.maximintegrated.com Maxim Integrated │  6 MAX20028 Evaluation Kit Evaluates: MAX20028 MAX20028 EV Kit PCB Layout (continued) MAX20028 EV Kit PCB Layout—Layer 3 MAX20028 EV Kit PCB Layout—Solder Side MAX20028 EV Kit Component Placement Guide—Solder Side www.maximintegrated.com Maxim Integrated │  7 MAX20028 Evaluation Kit Evaluates: MAX20028 Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 7/18 Initial release 1 2/19 Updated part number MAX20028AGJA/VY+ to MAX20028ATJA/VY+ in General Description, Detailed Description of Hardware, and EV Kit Bill of Materials DESCRIPTION — 1, 2, 4 For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html. 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. © 2018 Maxim Integrated Products, Inc. │  8