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The RT7247A is a high-efficiency current mode synchronous step-down regulator that can deliver up to 2A output
current from a wide input voltage range of 4.5V to 18V. This document explains the function and use of the
RT7247A evaluation board (EVB) and provides information to enable operation and modification of the evaluation
board and circuit to suit individual requirements.
Purpose .......................................................................................................................................................... 1
Introduction ..................................................................................................................................................... 2
General Product Information ...................................................................................................................... 2
Key Performance Summary Table ............................................................................................................. 3
Bench Test Setup Conditions ......................................................................................................................... 4
Headers Description and Placement ......................................................................................................... 4
Test Points ................................................................................................................................................. 4
Power-up & Measurement Procedure ........................................................................................................ 5
Output Voltage Setting ............................................................................................................................... 5
Schematic, Bill of Materials and Board Layout .............................................................................................. 6
EVB Schematic Diagram ............................................................................................................................ 6
Bill of Materials ........................................................................................................................................... 7
EVB Layout ................................................................................................................................................ 8
More Information .......................................................................................................................................... 11
Important Notice for Richtek Evaluation Board ............................................................................................ 11
UG7247AHGSP-00
July 2014
Purpose
Table of Contents
RT7247AHGSP
Evaluation Board
www.richtek.com
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Table of Contents
Related Manuals for Richtek RT7247AHGSP
Summary of Contents for Richtek RT7247AHGSP
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Page 1: Table Of Contents
Output Voltage Setting ..........................5 Schematic, Bill of Materials and Board Layout ....................6 EVB Schematic Diagram ..........................6 Bill of Materials ............................7 EVB Layout ..............................8 More Information ............................11 Important Notice for Richtek Evaluation Board .................... 11 UG7247AHGSP-00 July 2014 www.richtek.com... -
Page 2: Introduction
RT7247AHGSP Evaluation Board Introduction General Product Information General Description The RT7247A is a high efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 2A output current from a 4.5V to 18V input supply. The RT7247A's current mode architecture and external compensation allow the transient response to be optimized over a wide range of loads and output capacitors. -
Page 3: Key Performance Summary Table
Evaluation board number: PCB004_V1 Default Input Voltage Max Output Current Default Output Voltage 3.3V Default Marking & Package Type RT7247AHGSP, PSOP-8 (Exposed Pad) Operation Frequency Steady 340kHz at all loads Other Key Features 4.5V to 18V Input Voltage Range Programmable Soft-Start... -
Page 4: Bench Test Setup Conditions
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. -
Page 5: Power-Up & Measurement Procedure
RT7247AHGSP Evaluation Board Power-up & Measurement Procedure 1. Apply a 12V nominal input power supply (4.5V < V < 18V) 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 (<0.4V) to disable operation. -
Page 6: Schematic, Bill Of Materials And Board Layout
RT7247AHGSP Evaluation Board Schematic, Bill of Materials and Board Layout EVB Schematic Diagram SOP-8(Exposed Pad) VOUT 0.1uF 10uF 10uF 0.1uF 100k 10uH 22uF 22uF 0.1uF COMP 0.1uF 3.3nF C1, C2: 10μF/50V/X5R, 1206, TDK C3216X5R1H106K C4, C5: 22μF/16V/X5R, 1210, Murata GRM32ER61C226K L1: 10μH TAIYO YUDEN NR8040T100M, DCR=34mΩ... -
Page 7: Bill Of Materials
RT7247AHGSP Evaluation Board Bill of Materials Reference Part number Description Package Manufacture RT7247AHGSP DC-DC Converter PSOP-8 Richtek 10uF/±10%/50V/X5R C1, C2 C3216X5R1H106K160AB 1206 Ceramic Capacitor 22uF/±10%/16V/X5R C4, C5 GRM32ER61C226KE20# 1210 Murata Ceramic Capacitor 3.3nF/±10%/50V/X7R 0603B332K500 0603 WALSIN Ceramic Capacitor 0.1uF/±10%/50V/X7R C3, C6, C10,C11... -
Page 8: Evb Layout
RT7247AHGSP Evaluation Board EVB Layout Top View (1 layer) Bottom View (2 Layer) UG7247AHGSP-00 July 2014 www.richtek.com... - Page 9 RT7247AHGSP Evaluation Board Component Placement Guide—Component Side (1 layer) PCB Layout—Component Side (1 Layer) UG7247AHGSP-00 July 2014 www.richtek.com...
- Page 10 RT7247AHGSP Evaluation Board Component Placement Guide—Bottom Side (2 layer) PCB Layout—Bottom Side (2 layer) UG7247AHGSP-00 July 2014 www.richtek.com...
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Page 11: More Information
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 TO BUYER OR USER FOR ANY AND ALL DAMAGES INCLUDING WITHOUT LIMITATION TO DIRECT, INDIRECT, SPECIAL, PUNITIVE OR CONSEQUENTIAL DAMAGES.
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