USERS MANUAL ISL8018DEMO1Z UG052 Rev.3.00 Demonstration Board Aug 3, 2017 Description Key Features The ISL8018DEMO1Z is intended for point-of-load applications High efficiency synchronous buck regulator with up to 97% sourcing from 2.7V to 5.5V. The ISL8018DEMO1Z is a simple, efficiency small form factor demonstration board for a quick and easy 10% output voltage margining performance demonstration of the ISL8018 low quiescent, Adjustable current limit high efficiency synchronous buck regulator. Start-up with prebiased output The ISL8018DEMO1Z is a 20.07mmx16.51mm 4-layer FR4 Internal soft-start - 1ms or adjustable board with 2oz copper in all layers. The complete converter 2 occupies 115.613mm area. Soft-stop output discharge while disabled Adjustable frequency from 500kHz to 4MHz - default at 1MHz Specifications External synchronization up to 4MHz - master to slave phase This board has been configured and optimized for the following shifting capability operation conditions: Related Literature V = 2.7 to 5.5V IN For a full list of related documents, visit our website V = 1.8V OUT - ISL8018 product page I = 8A OUTMAX f = 1MHz SW Ordering Information Efficiency at 50% load: >90% Output ripple: <1% of output voltage (PWM mode) PART NUMBER DESCRIPTION Operating junction temperature range: -40C to +125C ISL8018DEMO1Z Demonstration board ISL8018 VIN VIN FS GND EN PHASE VOUT GND PG PGND EPAD SYNCIN SGND SYNCOUT COMP ISET SS VSET FB FIGURE 1. ISL8018DEMO1Z BLOCK DIAGRAM UG052 Rev.3.00 Page 1 of 6 Aug 3, 2017ISL8018DEMO1Z Recommended Equipment Functional Description The following materials are recommended for 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 This device is a monolithic, synchronous step-down DC/DC converter that can deliver up to 8A of continuous output current Electronic loads capable of sinking current up to 10A from 2.7V to 5.5V input supply. It uses peak current mode control Digital Multimeters (DMMs) architecture to allow low duty cycle operation. The device operates 100MHz quad-trace oscilloscope at 1MHz switching frequency. Signal generator PCB Layout Guidelines Quick Setup Guide The PCB layout is a very important design step to ensure the converter works well. For ISL8018, the power loop is composed 1. Ensure that the circuit is correctly connected to the supply and of the output inductor Ls, the output capacitor C , the PHASE OUT loads before applying any power. pins, and the PGND pin. It is necessary to make the power loop 2. Connect the bias supply to VIN, the plus terminal to VIN, and as small as possible and the connecting traces among them the negative return to PGND. should be direct, short, and wide. The switching node of the 3. Connect the output load to VOUT, the plus terminal to VO, and converter, the PHASE pins, and the traces connected to the node the negative return to PGND. are very noisy, so keep the voltage feedback trace away from these noisy traces. The input capacitor should be placed as close 4. Verify the output voltage is 1.8V for V O. 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 five vias ground connection within the pad for the best thermal relief. ISL8018DEMO1Z Demonstration Board ISL8018DEMO1Z FIGURE 2. TOP SIDE FIGURE 3. BOTTOM SIDE UG052 Rev.3.00 Page 2 of 6 Aug 3, 2017