EVB_RT6219AGQW

RT6224CHGJ6F Evaluation Board your power partner. 3A, 18V, 1.4MHz ACOT™ Synchronous Step-Down Converter Purpose The RT6224C is an ACOT control architecture step-down converter, which the input voltage range is from 4.3V to 18V and the output is adjustable from 0.6V to 8V. This document explains the function and use of the RT6224C 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 Bench Test Setup Conditions ........................................................................................................................................3 Schematic, Bill of Materials & Board Layout.................................................................................................................5 More Information ...........................................................................................................................................................8 Important Notice for Richtek Evaluation Board.............................................................................................................8 EVB_RT6224CHGJ6F-00 November 2016 1 http://www.richtek.com RT6224CHGJ6F Evaluation Board your power partner. Introduction General Product Information The RT6224C is a high-efficiency, monolithic synchronous step-down DC-DC converter that can deliver up to 3A output current from a 4.3V to 18V input supply. The RT6224C adopts ACOT™ architecture to allow the transient response to be improved and keep in constant frequency. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. Fault conditions also include output under-voltage protection, output over-voltage protection, and thermal shutdown. Product Feature         Small Output Voltage at Light Load High-Side Over-Current Limit Integrated 90m/45mMOSFETs 4.3V to 18V Supply Voltage Range 1.4MHz Switching Frequency ACOT™ Control 0.6V±1.5% Voltage Reference Monotonic Start-Up into Pre-biased Outputs Key Performance Summary Table Key Features Evaluation Board Number: PCB077_V1 Input Voltage Range 4.3V to 18V Max Output Current 3A Default Output Voltage 1.0V Default Marking & Package Type RT6224CHGJ6F, TSOT-23-6 (FC) Operation Frequency Steady 1.4MHz EVB_RT6224CHGJ6F-00 November 2016 2 http://www.richtek.com RT6224CHGJ6F 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 Name Description BOOT Bootstrap Supply Bootstrap supply for high-side gate driver. Connect a 0.1µF ceramic capacitor between the BOOT and SW pins. GND Ground Power ground. FB Feedback Feedback voltage input. The pin is used to set the output voltage of the converter via a resistive divider. The converter regulates VFB to 0.6V. EN Enable Enable control input. Connect EN to a logic-high voltage to enable the IC or to a logic-low voltage to disable. Do not leave this high impedance input unconnected. VIN Input Voltage Power input. The input voltage range is from 4.3V to 18V. Must bypass with a suitable large ceramic capacitor at this pin. SW Switch node Switch node. Connected to external L-C filter. EVB_RT6224CHGJ6F-00 November 2016 3 http://www.richtek.com RT6224CHGJ6F Evaluation Board your power partner. Power-up & Measurement Procedure 1. Apply a 12V nominal input power supply (4.3V < VIN < 18V) to the VIN and GND terminals. 2. Set the jumper at JP2 to connect terminals 2 and 3, connecting EN to VIN through resistor R5, to enable operation. 3. Verify the output voltage (approximately 1V) 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 (R2, R3) between VOUT and GND with the midpoint connected to FB. The output is set by the following formula : VOUT = 0.6 x (1 + R2 / R3) EVB_RT6224CHGJ6F-00 November 2016 4 http://www.richtek.com RT6224CHGJ6F 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 RT6224CHGJ6F DC-DC Converter TSOT-23-6(FC) RICHTEK C1, C4, C10, C11, D2 5 C3 1 C3216X5R1H106KT000N 10µF/50V/X5R/1206 C-1210 TDK C6, C8 2 C1608X7R1H104KT000N 0.1µF/50V/X7R/0603 C-0603 TDK C9 1 GRM31CR61A226KE19L 22µF/10V/X5R/1206 C-1210 Murata C12 1 C1608X5R1E105K080AC 1µ/25VX5R/0603 C-0603 TDK R2 1 WR06X1002FTL 10k/0603 R-0603 WALSIN/RALEC R3 1 WR06X1502FTL 15k/0603 R-0603 WALSIN R5 1 WR06X1003FTL 100k/0603 R-0603 WALSIN L1 1 NR6045-1R0 1µH L-GSTB135 TAIYO YUDEN EVB_RT6224CHGJ6F-00 NC November 2016 5 http://www.richtek.com RT6224CHGJ6F Evaluation Board your power partner. PCB Layout st Top View (1 layer) PCB Layout—Inner Side (2 EVB_RT6224CHGJ6F-00 November 2016 6 nd Layer) http://www.richtek.com RT6224CHGJ6F Evaluation Board your power partner. rd PCB Layout—Inner Side (3 Layer) th Bottom View (4 Layer) EVB_RT6224CHGJ6F-00 November 2016 7 http://www.richtek.com RT6224CHGJ6F 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_RT6224CHGJ6F-00 November 2016 8 http://www.richtek.com