EVB_RT9742AGJ5F

RT9742AGJ5F Evaluation Board your power partner. 55mΩ, 3A High-Side Power Switches with Flag Purpose The RT9742A is a cost-effective, low-voltage, single N-MOSFET high-side Power Switch IC for USB application. This document explains the function and use of the RT9742A 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 Key Performance Summary Table .......................................................................................................................... 2 Bench Test Setup Conditions ................................................................................................................................. 3 Schematic, Bill of Materials & Board Layout ........................................................................................................... 4 More Information.................................................................................................................................................... 6 Important Notice for Richtek Evaluation Board ....................................................................................................... 6 EVB_RT9742AGJ5F-00 October 2015 1 http://www.richtek.com RT9742AGJ5F Evaluation Board your power partner. Introduction General Product Information The RT9742A integrates an over-current protection circuit, a short fold back circuit, a thermal shutdown circuit and an under-voltage lockout circuit for overall protection. Besides, a flag output is vailable to indicate fault conditions to the local USB controller. Furthermore, the chip also integrates an embedded delay function to prevent miss-operation from happening due to inrush-current. The RT9742A is an ideal solution for USB power supply and can support flexible applications since it is available in TSOT-23-5 (FC) package. Product Feature           55mΩ (typ.) N-MOSFET Switch Operating Range : 2.7V to 6V Reverse Blocking Current Under Voltage Lockout Deglitched Fault Report (FLG) Thermal Protection with Fold-back Over Current Protection Short Circuit Protection UL Approved−E219878 Nemko Approved-NO87949 Key Performance Summary Table Key Features Evaluation Board Number : PCB050_V1 Input Voltage Range 2.7V to 6V Max Output Current 3A Default Output Voltage 5V @ VIN = 5V Default Marking & Package Type RT9742AGJ5F, TSOT-23-5 (FC) EVB_RT9742AGJ5F-00 October 2015 2 http://www.richtek.com RT9742AGJ5F 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 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 Power input. Support 2.7V to 6V Input Voltage. EN Enable test point High = Enable. Apply a voltage exceeds than enable logic high voltage (2V) for chip enable. GND Ground Ground. VOUT Output voltage Output voltage pin. Probe this pin to observe the output voltage waveform. /FLG Fault FLAG Output FLAG output indicator pin. FLAG is a low active output. Once the over current, short circuit, and over temperature occurring, it will indicate “LOW” after 10ms delay time. Power-up & Measurement Procedure 1. Connecting input power (2.7V < VIN < 6V) and input ground to VIN and GND test pins respectively. 2. Connecting positive end and negative terminals of load to VOUT and GND test pins respectively. 3. There is a 3-pin header “EN” for enable control. To use a jumper at “HI” option to tie EN test pin to input power VIN for enabling the device. Inversely, to use a jumper at “LO” option to tie EN test pin and ground GND for disabling the device. 4. Connecting an external load up to 5A to the VOUT and GND terminals and verify the over current protection and FLAG indication. EVB_RT9742AGJ5F-00 October 2015 3 http://www.richtek.com RT9742AGJ5F 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 RT9742AGJ5F Power Switch with Flag TSOT-23-5 (FC) RICHTEK CIN 1 10µF/10V/X7R/0805 C-0805 COUT 1 0.1μF/50V/X7R/0805 C-0805 C1, C2 2 NC J1 1 SIP-3P SIP-3P R1 1 10kΩ/0603 R-0603 R3 1 100kΩ/0603 R-0603 R2 1 NC GP1, GP2, GP3, GP4 4 VIN, GND, VOUT, GND (Gold Pin) SIP-1P TP1, TP2, TP3 3 VIN-S, VOUT-S, /FLG (Test Pin) SIP-1P EVB_RT9742AGJ5F-00 October 2015 4 http://www.richtek.com RT9742AGJ5F Evaluation Board your power partner. PCB Layout Top View Bottom View EVB_RT9742AGJ5F-00 October 2015 5 http://www.richtek.com RT9742AGJ5F 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 TO BUYER OR USER FOR ANY AND ALL DAMAGES INCLUDING WITHOUT LIMITATION TO DIRECT, INDIRECT, SPECIAL, PUNITIVE OR CONSEQUENTIAL DAMAGES. EVB_RT9742AGJ5F-00 October 2015 6 http://www.richtek.com