Evaluates: MAX17509 4.5V16V, MAX17509 Evaluation Kit Dual 3A Synchronous Buck Converter General Description Quick Start The MAX17509 evaluation kit (EV kit) is a fully assembled Recommended Equipment and tested circuit board to demonstrate the performance MAX17509 EV kit of the MAX17509, a dual 3A, high-efficiency, synchronous 4.5V to 16V, 4A DC input power supply step-down DC-DC converter. The EV kit operates from a 4.5V to 16V input voltage to generate two, independent Two loads capable of sinking 3A 3.3V and 1.2V outputs, with each regulator delivering Digital voltmeters (DVM) up to 3A continuous output current. The EV kit is preset 100MHz dual-trace oscilloscope to the default 1MHz switching frequency for optimum efficiency and component sizes, and each regulator Procedure operates 180 out-of-phase to reduce input-voltage ripple The EV kit is fully assembled and tested. Follow the steps and total RMS input ripple current. The EV kit also below to verify board operation. Caution: Do not turn on features adjustable input undervoltage-lockout (UVLO), the power supply until all connections are completed. programmable frequency, external frequency synchro- 1) Set the power supply at a voltage between 4.5V and nization input, adjustable output voltage ranging from 16V. Disable the power supply. 0.904V to 3.782V and 4.756V to 5.048V with 20mV 2) Connect the positive and negative terminals of the resolution, selectable switching slew rate, adjustable soft- power supply to IN and PGND PCB pads, respectively. start time with soft-stop option, power-good outputs, and 3) Connect the positive and negative terminals of the selectable overcurrent (OC) fault response to promote first 3A load to OUT1 and PGND PCB pads, respec - design flexibility and system reliability. tively, and the second 3A load to OUT2 and PGND Features PCB pads, respectively. Set both loads to 0A. 4) Connect the first DVM across the OUT1 and PGND Wide Input-Voltage Range (4.5V to 16V) PCB pads, and the second across OUT2 and PGND, 3.3V and 1.2V Output Voltages respectively. Up to 3A Output Current per Regulator 5) Change the position of SW1 and SW2 to position 1-2 (or 2-3) to enable the respective regulator. SW1 and Two Independent Outputs Operating 180 Out-of- SW2 in the middle position will disable the device. Phase 6) Enable the input power supply. 1MHz Switching Frequency 7) Verify that DVM1 displays 3.3V and DVM2 displays External Frequency Synchronization Input 1.2V. 8) Increase the load up to 3A to verify that DVM Brickwall and Latchoff Overcurrent Response continues displaying 3.3V and 1.2V, respectively. (Selectable to Hiccup Response) Note that the EV kit is designed to demonstrate com- Autoconfigured Internal Compensation pact solution-size so that the output voltage-sensing Power-Good Output Indicator is performed near C2 for VOUT1 and C3 for VOUT2. Therefore, the output voltage is accurate across Independent Adjustable EN/UVLO Input those respective components. Independent Adjustable Soft-Start Time with Soft- Stop Option Selectable Switching Slew Rate for EMC Compliant Low-Profile and Small-Size, Surface-Mount Ordering Information appears at end of data sheet. Components Fully Assembled and Tested 19-7670 Rev 1 9/16Evaluates: MAX17509 4.5V16V, MAX17509 Evaluation Kit Dual 3A Synchronous Buck Converter disable the device, test point TP1 to optionally synchro- Detailed Description of Hardware nize to an external clock source (SYNC), and LED1,2 The EV kit is a proven circuit to demonstrate the high- connected to PGOOD1,2 to indicate the status of the efficiency and compact solution-size of the synchronous outputs. Additional footprints of optional components are step-down DC-DC regulators. The EV kit operates from included to ease board modification for different input/ a 4.5V to 16V input voltage to generate two independent output configurations. Table 1 displays the resistor 3.3V and 1.2V outputs, with each regulator delivering up programming options. When the output voltage is changed, to 3A continuous output current. The switching frequency refer to the MAX17509 IC data sheets recommendation on is set to 1MHz to balance efficiency and component the inductance and capacitance selection criteria. size. The EV kit includes switches SW1,2 to enable/ Table 1. Summary of Resistor Programming R13 R1 R2 R5, R8 R6, R7 Index 1% RES. MODE SS1 SS2 COARSE FINE PHASE TSS1 LX- TSS2 COARSE FINE (k) MODE F OC SSTOP1 SSTOP2 SW SHIFT (ms) SLEW (ms) V (V) V (V) OUT OUT 475 (OPEN 0 500kHz 1 1 0.000 or VCC) 0.650 1 200 1.0MHz 4 4 0.019 180 2 115 1.5MHz 8 8 0.037 3 75 2.0MHz 16 16 0.966 0.057 4 53.6 500kHz 1 1 1.281 0.078 5 40.2 1.0MHz 4 4 1.597 0.097 0 6 30.9 1.5MHz 8 8 1.912 0.115 7 24.3 2.0MHz 16 16 2.228 0.135 8 19.1 500kHz 1 1 2.543 0.157 9 15 1.0MHz 4 4 2.859 0.176 10 11.8 1.5MHz 8 8 3.174 0.194 11 9.09 2.0MHz 16 16 3.490 0.213 4.756 12 6.81 500kHz 1 1 0.235 (7V VIN) 180 4.756 13 4.75 1.0MHz 4 4 0.254 (9V VIN) 4.756 14 3.01 1.5MHz 8 8 0.272 (12V VIN) 4.756 15 GND 2.0MHz 16 16 0.291 (16V VIN) Maxim Integrated 2 www.maximintegrated.com TWO SINGLE-PHASE DUAL-PHASE, SINGLE OUTPUT INDEPENDENT OUTPUTS HICCUP BRICKWALL AND LATCHOFF ENABLE DISABLE ENABLE DISABLE MINIMUM MAXIMUM ENABLE DISABLE ENABLE DISABLE