EVB_RT2101AGQW

RT2101AGQW Evaluation Board your power partner. RT2101AGQW Evaluation Board Purpose The RT2101A is a synchronous step-down converter with the input voltage range from 2.95V to 6V and provides 3A output current. This document explains the function and use of the RT2101A 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.................................................................................................................5 More Information ...........................................................................................................................................................7 Important Notice for Richtek Evaluation Board.............................................................................................................7 EVB_RT2101AGQW-00 January 2017 1 http://www.richtek.com RT2101AGQW Evaluation Board your power partner. Introduction General Product Information The RT2101A is a high efficiency step-down converter and capable of delivering 3A output current over a wide input voltage range from 2.95V to 6V. The RT2101A provides accurate regulation for a variety of loads with ±3% accuracy. For reducing inductor size, it provides up to 2MHz switching frequency. The efficiency is maximized through the integrated 45mΩ MOSFETs and 550μA typical supply current. Under voltage lockout voltage of the RT2101A is 2.7V, and it also provides external setting by a resistor network on the enable pin. The RT2101A provides protections such as inductor current limit under voltage lockout and thermal shutdown. The over temperature threshold is 145°C. The RT2101A is available in WQFN-16L 3x3 package. Product Feature            Integrated 45mMOSFETs Input Range : 2.95V to 6V Adjustable PWM Frequency : 700kHz to 2MHz Output Current : 3A 95% Efficiency Adjustable Soft-Start Power Good Indicator Enable Control Under Voltage Lockout Current Limit Thermal Shutdown Key Performance Summary Table Key Features Evaluation Board Number : PCB038_V1 Input Voltage Range 2.95V to 6V Max Output Current 3A Default Output Voltage 1.8V Default Marking & Package Type RT2101AGQW, WQFN-16L 3x3 Operation Frequency Adjustable from 700kHz to 2MHz EVB_RT2101AGQW-00 January 2017 2 http://www.richtek.com RT2101AGQW Evaluation Board your power partner. Bench Test Setup Conditions Headers Description and Placement Carefully inspect all the components used in the EVB according to the following Bill of Materials table, and then make sure all the components are undamaged and correctly installed. If there is any missing or damaged component, which may occur during transportation, please contact our distributors or e-mail us at 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. EN Enable test point Chip Enable. Externally pulled high to enable and pulled low to disable thischip. It is internally pulled up to high when the pin is floating. GND Ground Power Ground. PGOOD Power good test point Output of power good indicator. BOOT Bootstrap supply test point Bootstrap supply for high-side gate driver. Connect a 0.1µF ceramic capacitor between the BOOT and SW pins. LX Switch node test point Connect this pin to an external L-C filter. RT/SYNC Clock input Frequency Setting and External Synchronous. EVB_RT2101AGQW-00 January 2017 3 http://www.richtek.com RT2101AGQW Evaluation Board your power partner. Power-up & Measurement Procedure 1. Apply a 12V nominal input power supply (2.95V < VIN < 6V) to the VIN and GND terminals. 2. Set the jumper at JP1 to connect terminals 1 and 2, connecting EN to enable operation. 3. Verify the output voltage (approximately 1.8V) between VOUT and GND. 4. Connect an external load up to 3A to the VOUT and GND terminals and verify the output voltage and current. Output Voltage Setting Set the output voltage with the resistive divider (R1, R2) between VOUT and GND with the midpoint connected to FB. The output is set by the following formula : VOUT = 0.827 x (1 + R1 ) R2 EVB_RT2101AGQW-00 January 2017 4 http://www.richtek.com RT2101AGQW Evaluation Board your power partner. Schematic, Bill of Materials & Board Layout EVB Schematic Diagram Bill of Materials Reference Qty Part number Description Package Manufacturer U1 1 RT2101AGQW DC-DC Converter WQFN-16L 3x3 Richtek R1 1 RTT031182FTP 11.8k R-0603 旺詮 R2 1 WR06X1002FTL 10k R-0603 WALSIN R3 1 WR06X7871FTL 7.68k R-0603 WALSIN R4 1 WR06X1803FTL 180k R-0603 WALSIN R5 1 WR06X1003FTL 100k R-0603 WALSIN C1 1 C2012X5R1C106KT 10µF/16V/X5R C-0805 TDK C3 1 C1608X5R1E105KT000E 1µF/25V/X5R C-0603 TDK C5, C6 2 GRM32ER61C226KE20L 22µF/16V/X7R C-1210 muRata C8 1 C1608X7R1H104KT000N 0.1µF/50V/X7R C-0603 TDK C10 1 0603B103K500 10nF/50V/x7R C-0603 WALSIN C11 1 0603B332K500 3.3nF/50V/X7R R-0603 WALSIN L1 1 7447714015 1.5µH/10A 10 x 10 x 5 mm WE EVB_RT2101AGQW-00 January 2017 5 http://www.richtek.com RT2101AGQW Evaluation Board your power partner. PCB Layout st Top View (1 layer) th Bottom View (4 Layer) EVB_RT2101AGQW-00 January 2017 6 http://www.richtek.com RT2101AGQW 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_RT2101AGQW-00 January 2017 7 http://www.richtek.com