RT5710CHGQW Evaluation Board your power partner. 1A, 1.5MHz, 5.5V CMCOT Synchronous Step-Down Converter Purpose The RT5710C is a synchronous step-down converter with the input voltage range from 2.5V to 5.5V and provides 1A output current. This document explains the function and use of the RT5710C 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.................................................................................................................................................... 7 Important Notice for Richtek Evaluation Board ....................................................................................................... 7 EVB_RT5710CHGQW-00 October 2015 1 http://www.richtek.com RT5710CHGQW Evaluation Board your power partner. Introduction General Product Information The RT5710C is a high efficiency synchronous step-down DC/DC converter. Its input voltage range is from 2.5V to 5.5V and provides an adjustable regulated output voltage from 0.6V to 3.4V while delivering up to 1A of output current. The internal synchronous low on-resistance power switches increase efficiency and eliminate the need for an external Schottky diode. The Current Mode Constant-On-time (CMCOT) operation with internal compensation allows the transient response to be optimized over a wide range of loads and output capacitors. Product Feature Efficiency Up to 95% RDS(ON) 160m HS / 110m LS VIN Range 2.5V to 5.5V VREF 0.6V with ±2% Accuracy CMCOT™ Control Loop Design for Best Transient Response, Robust Loop Stability with Low-ESR(MLCC) COUT Fixed Soft-Start 1.2ms Cycle-by-Cycle Over Current Protection Input Under Voltage Lockout Output Under Voltage Protection (UVP Hiccup) Thermal Shutdown Protection Power Saving at Light Load Key Performance Summary Table Key Features Evaluation Board Number : PCB034_V1 Default Input Voltage 3.3V Max Output Current 1A Default Output Voltage 1.2V Default Marking & Package Type RT5710CHGQW, WDFN-6L 2x2 Operation Frequency Fixed 1.5MHz EVB_RT5710CHGQW-00 October 2015 2 http://www.richtek.com RT5710CHGQW 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 [email protected] 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 Supply Voltage Input. EN Enable test point Enable control input. GND Ground Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum thermal dissipation. IC No internal connection FB Feedback LX Switch node test point Switch node. Power-up & Measurement Procedure 1. Apply a 3.3V nominal input power supply (2.5V < VIN < 5.5V) to the VIN and GND terminals. 2. Set the jumper at JP1 to connect terminals 2 and 3, connecting EN to enable operation. 3. Verify the output voltage (approximately 1.2V) between VOUT and GND. 4. Connect an external load up to 1A 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_RT5710CHGQW-00 October 2015 3 http://www.richtek.com RT5710CHGQW 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 RT5710CHGQW DC/DC Converter WDFN-6L 2x2 RICHTEK C1, C2 2 GRM31CR71E106KA12L 10μF/25V/X7R C-1206 MURATA C3, C5 2 C1608X7R1H104K080AA 0.1μF/±10%/50V/X7R C-0603 MURATA C4 1 0603N220J500 22pF/50V/NOP C-0603 WALSIN C6 1 GRM31CR71E106KA12L 10μF/25V/X7R C-1206 MURATA R1, R2, R3 3 100k R-0603 R4 1 N/A L 1 EVB_RT5710CHGQW-00 SR04033R3MSB October 2015 3.3μH/2.15A 4 4.5 x 4 mm ABC ELECTRONICS http://www.richtek.com RT5710CHGQW Evaluation Board your power partner. PCB Layout Top View (1st layer) PCB Layout—Inner Side (2nd Layer) EVB_RT5710CHGQW-00 October 2015 5 http://www.richtek.com RT5710CHGQW Evaluation Board your power partner. PCB Layout—Inner Side (3rd Layer) Bottom View (4th Layer) EVB_RT5710CHGQW-00 October 2015 6 http://www.richtek.com RT5710CHGQW 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_RT5710CHGQW-00 October 2015 7 http://www.richtek.com