EVB_RT2862GSP

your power partner. RT2862GSP Evaluation Board RT2862 Step-Down Converter Evaluation Board Purpose The RT2862 is a high-efficiency current mode synchronous step-down regulator that can deliver up to 3A output current from a wide input voltage range of 4.5V to 36V. This document explains the function and use of the RT2862 evaluation board (EVB) and provides information to enable operation and modification of the evaluation board and circuit to suit individual requirements. Table of Contents Purpose ............................................................................................................................................................... 1 Introduction.......................................................................................................................................................... 2 General Product Description ................................................................................................................................ 2 Product Features ................................................................................................................................................. 2 Application ........................................................................................................................................................... 2 Evaluation Board ................................................................................................................................................. 3 Specification ........................................................................................................................................................ 4 Schematic............................................................................................................................................................ 4 BOM .................................................................................................................................................................... 5 PCB Layout ......................................................................................................................................................... 6 Step-Down Converter Efficiency Test ................................................................................................................. 10 More Information................................................................................................................................................ 11 Important Notice for Richtek Evaluation Board ................................................................................................... 11 EVB_RT2862GSP-01 May 2016 http://www.richtek.com your power partner. RT2862GSP Evaluation Board Introduction General Product Description The RT2862 is a high efficiency, current mode synchronous step-down DC/DC converter that can deliver up to 3A output current over a wide input voltage range from 4.5V to 36V. The device integrates a 105mΩ high side and an 80mΩ low side MOSFET to achieve high conversion efficiency up to 95%. The current mode control architecture supports fast transient response and uses a simple compensation circuit. A cycle-by-cycle current limit function provides protection against a shorted output and an internal soft-start eliminates input surge current during start-up. The RT2862 provides complete protection functions such as input under voltage lockout, output under voltage protection, over current protection and thermal shutdown. The RT2862 is available in the thermal enhanced SOP-8 (Exposed Pad) package. Product Features  4.5V to 36V Input Voltage Range  3A Output Current  Internal N-MOSFETs  Current Mode Control  Frequency Operation : 300kHz to 1MHz  Adjustable Output Voltage from 0.8V to 30V  High Efficiency Up to 95%  Stable with Low ESR Ceramic Output Capacitors  Cycle-by-Cycle Current Limit Application     Point of Load Regulator in Distributed Power Systems Digital Set Top Boxes Broadband Communications Vehicle Electronics  Automotive Audio, Navigation, and Information Systems Enterprise Datacom Platforms Point of Load (POL)  Industrial Grade General Purpose Point of Load  EVB_RT2862GSP-01 May 2016 http://www.richtek.com RT2862GSP Evaluation Board your power partner. Evaluation Board Please carefully inspect the EVB IC and external components, comparing them to the following Bill of Materials, to ensure that all components are installed and undamaged. If any components are missing or damaged during transportation, please contact the distributor or send e-mail to evb_service@richtek.com Test Points The EVB is provided with the test points and pin names listed in the table below. Test point/Pin name VIN Signal Input voltage Comment (expected waveforms or voltage levels on test points) Input voltage range = 4.5V to 36V Default output voltage = 3.3V VOUT Output voltage Output voltage range = 0.8V to 30V (see ‘’ Output Voltage Setting’’ section for changing output voltage level) SW Switch Node SW waveform EN Chip Enable Operation BOOT Boot strap supply test point Floating supply voltage for the high-side N-MOSFET switch MODE RT test point Switching frequency setting point GND Ground Ground Enable signal. EN is automatically pulled high (by R4) to enable operation. Connect EN low to disable operation. Power-up & Measurement Procedure 1. Apply a 12V nominal input power supply (4.5V < VIN < 36V) to the VIN and GND terminals. 2. The EN voltage is pulled to logic high by R4 (100kΩ to VIN) to enable operation. Drive EN high (>2.0V) to enable operation or low (