your power partner. RT6266GSP Evaluation Board RT6266 Step-Down Converter Evaluation Board Purpose The RT6266 is a high-efficiency, monolithic asynchronous step-down DC/DC converter with load line Compensation. This document explains the function and use of the RT6266 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 ........................................................................................................................ 2 Specification ............................................................................................................................... 3 Schematic .................................................................................................................................. 3 BOM ........................................................................................................................................... 4 PCB Layout ................................................................................................................................ 4 Step-Down Converter Efficiency Test ........................................................................................ 5 More Information ........................................................................................................................ 6 Important Notice for Richtek Evaluation Board .......................................................................... 6 EVB_RT6266GSP-00 June 2015 http://www.richtek.com your power partner. RT6266GSP Evaluation Board Introduction General Product Description The RT6266 is a high-efficiency, monolithic asynchronous step-down DC/DC converter that can deliver up to 2.4A output current from a 7.5V to 36Vinput supply. The RT6266’s current mode architecture with internal compensation is optimized for 5V car charger application over a wide range of loads and output capacitors. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. The RT6266 also provides output over voltage protection output under voltage protection and thermal shutdown protection. The low current (<3μA) shutdown mode provides output disconnect, enabling easy power management in battery-powered systems. The RT6266 is available in a SOP-8 (Exposed Pad) package. Product Features ±2% High Accuracy Feedback Voltage 7.5V to 36V Input Voltage Range 2.4A Continuous Output Current (2.7A Peak) CC/CV Mode Control Adjustable Load Line Compensation Short Circuit Protection Integrated N-MOSFET Switches Current Mode Control Fixed Frequency Operation : 100kHz Programmable Output Current Limit 110mΩ Internal Power MOSFET Switch Low EMI Up to 95% Efficiency Cycle-by-Cycle Over Current Protection Input Under Voltage Lockout Output Under Voltage Protection Thermal Shutdown Protection Application USB Power Supplies Automotive Cigarette Lighter Adapters Power Supply for Linear Chargers DC/DC Converters with Current Limited 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 [email protected] EVB_RT6266GSP-00 June 2015 http://www.richtek.com RT6266GSP Evaluation Board your power partner. 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 = 7.5V to 36V VOUT Output voltage Output voltage = 5V CSP Current Sense Positive Input. CSN Current Sense Negative Input. In this RT6266 EVB original setting, the CSP pin of JP1 should be connected short with CSN1 by jumper for normal operation. In this RT6266 EVB original setting, the CSN pin of JP2 should be connected short with CSN2 by jumper for normal operation. Power-up & Measurement Procedure 1. Connect input power (7.5V< VIN < 36V) and input ground to VIN pin. 2. Connect positive end and negative end of load to VOUT pin. 3. The output voltage of (Vout) can be set by R1 and R2. Vout = VREF * (1+R1/R2) where VREF = 0.8V (typ.) Specification Parameter Input Voltage Range Symbol Min VIN 7.5 Output Voltage VOUT Oscillator Frequency fOSC Output Current IOUT Upper Switch Current Limit ILIM Typ. Max Units 36 V 5 85 100 4.4 V 115 kHz 2.4 A A Schematic EVB_RT6266GSP-00 June 2015 http://www.richtek.com RT6266GSP Evaluation Board your power partner. BOM Reference Q'ty P/N Description Package Manufacture U1 1 RT6266GSP Step-down converter SOP-8 RICHTEK C2, C8, C12 3 C1608X7R1H104K080AA 0.1μF/±10%/50V/X7R C-0603 TDK C3, C4 2 C3216X5R1H106K160AB 10μF/±10%/50V/X5R C-1206 TDK C1, C5, C6, C7, C10, C13 6 C9 1 GR, E-Cap 470μF/16V C11 1 C3216X7R1E106K 10uF/±10%/25V/X7R L1 1 L2 1 L3 1 D1 1 R1 1 180k R2 1 34.3k R3 1 100k R6, R7 2 Short R17, R18 2 67m R4, R5, R8 3 NC NC CHI LI TEH C-1206 TDK Short MCD110C-390K-LV 39uH MAG.LAYERS NC CDBA340-G 3A/40V Comchip PCB Layout Top View Bottom View EVB_RT6266GSP-00 June 2015 http://www.richtek.com your power partner. RT6266GSP Evaluation Board Step-Down Converter Efficiency Test EVB_RT6266GSP-00 June 2015 http://www.richtek.com your power partner. RT6266GSP Evaluation Board 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_RT6266GSP-00 June 2015 http://www.richtek.com