EVB_RT8279GSP

your power partner. RT8279GSP Evaluation Board RT8279 Step-Down Converter Evaluation Board Purpose The RT8279 is a Current mode operation step-down regulator with an internal power MOSFET. This document explains the function and use of the RT8279 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 .................................................................................................................................................................... 4 PCB Layout ......................................................................................................................................................... 5 Step-Down Converter Efficiency Test ................................................................................................................... 7 More Information.................................................................................................................................................. 8 Important Notice for Richtek Evaluation Board ..................................................................................................... 8 EVB_RT8279GSP-00 June 2015 http://www.richtek.com your power partner. RT8279GSP Evaluation Board Introduction General Product Description The RT8279 is a step-down regulator with an internal power MOSFET. It achieves 5A of continuous output current over a wide input supply range with excellent load and line regulation. Current mode operation provides fast transient response and eases loop stabilization. For protection, the RT8279 provides cycle-by-cycle current limiting and thermal shutdown protection. An adjustable soft-start reduces the stress on the input source at start up. In shutdown mode, the regulator draws only 25μA of supply current. The RT8279 requires a minimum number of readily available external components, providing a compact solution. The RT8279 is available in the SOP-8 (Exposed Pad) package. Product Features  5A Output Current Internal Soft-Start 110mΩ Internal Power MOSFET Switch Internal Compensation Minimizes External Parts Count High Efficiency up to 90% 25μA Shutdown Mode Fixed 500kHz Frequency Thermal Shutdown Cycle-by-Cycle Over Current Protection Wide 5.5V to 36V Operating Input Range Adjustable Output Voltage from 1.222V to 26V Available In an SOP-8 (Exposed Pad) Package  RoHS Compliant and Halogen Free            Application  Distributive Power Systems   Battery Charger DSL Modems  Pre-regulator for Linear Regulators EVB_RT8279GSP-00 June 2015 http://www.richtek.com RT8279GSP 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 Signal Comment (expected waveforms or voltage levels on test points) VIN Input voltage Input voltage range = 5.5V to 36V VOUT Output voltage Output voltage = 2.4V SW Switch Node The EN pin is externally pulled to High by adding a 100kΩ resistor (R4) from the VIN pin in this EVB setting. For another enable EN Chip Enable Operation operation, pull the EN pin low (1.4V,