User Guide 052 ISL8018DEMO1Z Demonstration Board User Guide Description Key Features The ISL8018DEMO1Z is intended for use by individuals with requirements for point-of-load applications sourcing from 2.7V to 5.5V. The ISL8018DEMO1Z simple smallest factor demonstration board is used for a quick and easy demonstration of the performance of the ISL8018 low quiescent high efficiency synchronous buck regulator. • High efficiency synchronous buck regulator with up to 97% efficiency The ISL8018DEMO1Z is a 20.07mmx16.51mm 4-layer FR4 board with 2oz copper in all layers. The complete converter occupies 115.613mm2 area. • Internal soft-start - 1ms or adjustable References • External synchronization up to 4MHz - master to slave phase shifting capability • ±10% output voltage margining • Adjustable current limit • Start-up with prebiased output • Soft-stop output discharge during disabled • Adjustable frequency from 500kHz to 4MHz - default at 1MHz ISL8018 Datasheet Ordering Information PART NUMBER ISL8018DEMO1Z DESCRIPTION Demonstration board ISL8018 VIN VIN GND FS EN PHASE VOUT GND PG EPAD PGND SYNCIN SGND SYNCOUT COMP ISET SS VSET FB FIGURE 1. ISL8018DEMO1Z BLOCK DIAGRAM October 26, 2015 UG052.1 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2015. All Rights Reserved Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. User Guide 052 Recommended Equipment Functional Description The following materials are recommended to perform testing: The ISL8018DEMO1Z board provides a simple platform for the ISL8018. • 0V to 10V power supply with at least 15A source current capability or 5V battery • Electronic loads capable of sinking current up to 10A • Digital Multimeters (DMMs) • 100MHz quad-trace oscilloscope • Signal generator Quick Setup Guide 1. Ensure that the circuit is correctly connected to the supply and loads prior to applying any power. 2. Connect the bias supply to VIN, the plus terminal to VIN and the negative return to PGND. 3. Connect the output load to VOUT, the plus terminal to VO and the negative return to PGND. 4. Verify the output voltage is 1.8V for VO. This device is a monolithic, synchronous step-down DC/DC converter that can deliver up to 8A of continuous output current from 2.7V to 5.5V input supply. It uses peak current mode control architecture to allow low duty cycle operation. The device operates at 1MHz switching frequency. PCB Layout Guidelines The PCB layout is a very important converter design step to make sure the designed converter works well. For ISL8018, the power loop is composed of the output inductor L’s, the output capacitor COUT, the PHASE pins and the PGND pin. It is necessary to make the power loop as small as possible and the connecting traces among them should be direct, short and wide. The switching node of the converter, the PHASE pins and the traces connected to the node are very noisy, so keep the voltage feedback trace away from these noisy traces. The input capacitor should be placed as close as possible to the VIN pin and the ground of the input and output capacitors should be connected as close as possible. The heat of the IC is mainly dissipated through the thermal pad. Maximizing the copper area connected to the thermal pad is preferable. In addition, a solid ground plane is helpful for better EMI performance. It is recommended to add at least 5 vias ground connection within the pad for the best thermal relief. ISL8018DEMO1Z Demonstration Board ISL8018DEMO1Z FIGURE 2. TOP SIDE Submit Document Feedback 2 FIGURE 3. BOTTOM SIDE UG052.1 October 26, 2015 User Guide 052 ISL8018DEMO1Z Schematic / 8+ 9,1 9,1 & 8) 9287 & & & 8) 8) X) 5 9,1 3* 6<1&287 X) $ 3 5 $ & 3*1' /; /; /; 9,1 9,1 (3 3 & 8) 92 8 ,6/,5= 6<1&,1 3*1' 3*1' 6*1' 9)% . & $ 3) 5 . 5 66 ,6(7 9,1 &203 )6 96(7 (1 $ 23(1 $ FIGURE 4. ISL8018DEMO1Z SCHEMATIC Bill of Materials REFERENCE DESIGNATOR QTY UNITS DESCRIPTION MANUFACTURER MANUFACTURER PART 1 ea ISL8018DEMO1ZPCB IMAGINEERING INC. ISL8018DEMO1ZPCB C7 1 ea CAP, SMD, 0402, 15pF, 50V, 5%, NP0, ROHS MURATA GRM36COG150J050AQ C1, C2, C3, C4, C5, C6 6 ea CAP, SMD, 1206, 22µF, 6.3V, 20%, X5R, 1.6mm Height, ROHS TDK C3216X5R0J226M160AA L1 1 ea COIL-PWR INDUCTOR, SMD, 7x6.9, 0.76µH, 20%, 15.5A, 2.25mΩ, ROHS Wurth Electronics 744314076 VO, VIN 2 ea CONN-MINI TEST PT, VERTICAL, RED, ROHS KEYSTONE 5000 P1, P2 2 ea CONN-MINI TEST PT, VERTICAL, BLK, ROHS KEYSTONE 5001 U3 1 ea IC-ADJ. 8A BUCK REGULATOR, 20P, QFN, 3X4, ROHS INTERSIL ISL8018IRAJZ R3 1 ea RES, SMD, 0402, 0Ω, 1/16W, 5%, TF, ROHS VENKEL H2510-00R00-1/16W-T R2 1 ea RES, SMD, 0402, 100k, 1/16W, 1%, TF, ROHS PANASONIC ERJ2RKF1003 R1 1 ea RES, SMD, 0402, 200k, 1/16W, 1%, TF, ROHS ROHM MCR01MZPF2003 R4 0 ea RES, SMD, 0402, DNP, DNP, DNP, TF, ROHS Submit Document Feedback 3 UG052.1 October 26, 2015 User Guide 052 ISL8018DEMO1Z Board Layout FIGURE 5. TOP COMPONENTS Submit Document Feedback 4 FIGURE 6. BOTTOM SILK SCREEN UG052.1 October 26, 2015 User Guide 052 Typical Performance Curves VIN = 5.5V, VOUT = 1.8V, IOUT = 8A VIN 2V/DIV IOUT 2A/DIV VIN 2V/DIV VOUT 1V/DIV IOUT 2A/DIV VOUT 1V/DIV 1ms/DIV 200µs/DIV FIGURE 7. VIN AT FULL LOAD FIGURE 8. SHUTDOWN WITH VIN AT FULL LOAD C2 20mV/DIV 1µs/DIV FIGURE 9. VOUT RIPPLE ACROSS THE OUTPUT CAPS Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that the document is current before proceeding. For information regarding Intersil Corporation and its products, see www.intersil.com Submit Document Feedback 5 UG052.1 October 26, 2015