RT2568GQW Evaluation Board your power partner. DDR Termination Regulator Purpose The RT2568 is a sink/source tracking termination regulator. This document explains the function and use of the RT2568 evaluation board (EVB), and provides information to enable operation, modification of the evaluation board and circuit to suit individual requirements. Table of Contents Purpose ................................................................................................................................................................. 1 Introduction............................................................................................................................................................ 2 Applications ........................................................................................................................................................... 2 Bench Test Setup Conditions ................................................................................................................................. 3 Schematic, Bill of Materials & Board Layout ........................................................................................................... 5 More Information.................................................................................................................................................... 8 Important Notice for Richtek Evaluation Board ....................................................................................................... 8 EVB_RT2568GQW-00 December 2015 1 http://www.richtek.com RT2568GQW Evaluation Board your power partner. Introduction General Product Information The RT2568 is a sink/source tracking termination regulator. It is specifically designed for low-cost and low-external component count systems. The RT2568 possesses a high speed operating amplifier that provides fast load transient response and only requires a minimum 10μF x 3 ceramic output capacitor. The RT2568 supports remote sensing functions and all features required to power the DDRIII and Low Power DDRIII/DDRIV VTT bus termination according to the JEDEC specification. In addition, the RT2568 provides an open-drain PGOOD signal to monitor the output regulation and an EN signal that can be used to discharge VTT during S3 (suspend to RAM) for DDR applications. The RT2568 is available in the thermal efficient package, WDFN-10L 3x3. Product Feature VIN Input Voltage Range : 1.1V to 3.5V VCNTL Input Voltage Range : 2.9V to 5.5V Support Ceramic Capacitors Power Good Indicator 10mA Source/Sink Reference Output Meet DDRI, DDRII JEDEC Spec Support DDRIII, Low Power DDRIII/DDRIV VTT Applications Soft-Start Function UVLO and OCP Protection Thermal Shutdown Applications Notebook/Desktop/Server Telecom/Datacom, GSM Base Station, LCD-TV/PDPTV, Copier/Printer, Set-Top Box Key Performance Summary Table Key Features Evaluation Board Number : PCB027_V1 Input Voltage Range 1.1V to 3.5V VCNTL Input Voltage Range 2.9V to 5.5V Max Output Current 3A Default Output Voltage Set by REFIN pin voltage level (VOUT = VREFIN) Default Marking & Package Type RT2568GQW, WDFN-10L 3x3 EVB_RT2568GQW-00 December 2015 2 http://www.richtek.com RT2568GQW Evaluation Board your power partner. Bench Test Setup Conditions Headers Description and Placement 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 [email protected] 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 = 2.9V to 5.5V VOUT Output voltage Power output of the regulator. EN Enable test point Enable Control Input. EN = High (higher than 1.7V) for ON operation, while EN = Low (lower than 0.3V) for OFF operation. GND Ground VCNTL Control voltage input REFIN Reference input REFOUT Reference output PGOOD Power good output test point EVB_RT2568GQW-00 December 2015 Ground. Control voltage input. Connect this pin to the 3.3V or 5V power supply. A ceramic decoupling capacitor with a value 4.7µF is required. Reference input. Reference output. Connect to GND through a 0.1µF ceramic capacitor. Power good open-drain output. Connect a pull-up resistor between this pin and VCNTL pin. 3 http://www.richtek.com RT2568GQW Evaluation Board your power partner. Power-up & Measurement Procedure 1. Short J1 and the (1, 2) pin of J2 by jumper respectively. 2. Provide input voltage (2.9V < VCNTL < 5.5V) to VCNTL pin. 3. Connect input power (1.1V < VIN < 3.5V) and input ground to VIN and GND pins respectively. 4. Connect positive end and negative end of load to VOUT and GND of output pins respectively. 5. The output voltage of (VOUT) can be set by R1 and R2 : R2 ) VOUT = VIN × ( R1 + R2 6. If J1 is not shorted by Jumper, the output voltage can be set by the input voltage of REFIN pin : VOUT = VREFIN Specification Parameter Symbol Min Control Input Voltage VCNTL Supply Input Voltage Max Units 2.9 5.5 V VIN 1.1 3.5 V VOUT Source Current Limit ILIM_VOUT_SR 3.5 5.5 A VOUT Sink Current Limit ILIM_VOUT_SK 3.5 5.5 A VREFIN 0.5 1.8 V REFIN Voltage Range EVB_RT2568GQW-00 December 2015 4 Typ. http://www.richtek.com RT2568GQW Evaluation Board your power partner. Schematic, Bill of Materials & Board Layout EVB Schematic Diagram Bill of Materials Reference Qty Part Number Description Package Manufacture U1 1 RT2568GQW DDR Termination Regulator WDFN-10L 3x3 RICHTEK C2, C3, C6, C7, C8 5 GRM219R61A106KE44D 10µF/X5R/16V C-0805 MURATA C13 1 C1608X7R1H104K080AA 0.1µF/50V/X7R C-0603 TDK C12 1 C2012X5R0J475KT00HW 4.7µF/X5R/6.3V C-0805 TDK C1 1 0603B102K500 1nF/50V/X7R C-0603 WALSIN C4, C5, C9, C10, C11, C14, C15, C16, C17, C18, C19 11 NC R1, R2 2 10k R-0603 R3 1 100k R-0603 R4 1 0 EVB_RT2568GQW-00 December 2015 5 http://www.richtek.com RT2568GQW Evaluation Board your power partner. PCB Layout Top View (1st layer) PCB Layout—Inner Side (2nd Layer) EVB_RT2568GQW-00 December 2015 6 http://www.richtek.com RT2568GQW Evaluation Board your power partner. PCB Layout—Inner Side (3rd Layer) Bottom View (4th Layer) EVB_RT2568GQW-00 December 2015 7 http://www.richtek.com RT2568GQW Evaluation Board your power partner. More Information For more information, please find the related datasheet or application notes from Richtek website http://www.richtek.com. Important Notice for Richtek Evaluation Board THIS DOCUMENT IS FOR REFERENCE ONLY, NOTHING CONTAINED IN THIS DOCUMENT SHALL BE CONSTRUED AS RICHTEK’S WARRANTY, EXPRESS OR IMPLIED, UNDER CONTRACT, TORT OR STATUTORY, WITH RESPECT TO THE PRESENTATION HEREIN. IN NO EVENT SHALL RICHTEK BE LIABLE T O BUYER OR USER FOR ANY AND ALL DAMAGES INCLUDING WITHOUT LIMITATION TO DIRECT, INDIRECT, SPECIAL, PUNITIVE OR CONSEQUENTIAL DAMAGES. EVB_RT2568GQW-00 December 2015 8 http://www.richtek.com