RT6219AGQW Evaluation Board your power partner. 4A, 23V, 500kHz, ACOT™ Synchronous Buck Converter Purpose The RT6219A is an ACOTTM synchronous Buck converter with the input voltage range from 5V to 23V and provides 4A output current. This document explains the function and use of the RT6219A 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.................................................................................................................................................... 8 Important Notice for Richtek Evaluation Board ....................................................................................................... 8 EVB_RT6219AGQW-00 October 2015 1 http://www.richtek.com RT6219AGQW Evaluation Board your power partner. Introduction General Product Information The RT6219A is a synchronous Buck converter with Advanced Constant On-Time (ACOTTM) mode control which provides a very fast transient response with no external compensators. The RT6219A operates from 5V to 23V input voltage, provides complete protection functions including Over Current Protection (OCP), Under Voltage Protection (UVP) and Over Voltage Protection (OVP). This IC also provides a 1.5ms internal soft-start function and an open-drain power good indicator. Product Feature 5V to 23V Input Voltage Range Adjustable from 0.6V to 5V Output Range Up to 98% Duty for 2S Battery Application 500kHz Switching Frequency Fixed Switching Frequency: 500kHz ACOT™ Mode Performs Fast Transient Response Integrated MOSFETs 67mΩ of High-Side MOSFET 41mΩ of Low-Side MOSFET Supports MLCC Output Capacitors Internal Soft-Start (1.5ms typ) Built-in OVP/UVP/OCP Power Good Indicator Thermal Shutdown Key Performance Summary Table Key Features Evaluation Board Number : PCB049_V1 Input Voltage Range 5V to 23V Max Output Current 4A Default Output Voltage 5V Default Marking & Package Type RT6219AGQW, WDFN-10L 3x3 Operation Frequency 500kHz at CCM EVB_RT6219AGQW-00 October 2015 2 http://www.richtek.com RT6219AGQW Evaluation Board your power partner. Bench Test Setup Conditions Headers Description and Placement Top View Bottom View 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) EN Enable test point Enable Control Input. Do not leave this pin floating. The slew rate of EN is recommended to be slower than 4.8V/µs. GND Ground Ground. PG Power good indicator Open-Drain Power Good Indicator Output. VBYP External 5V supply Switch Over Input Supply Voltage for VCC. A low pass filter shoulde be connected to GND, if VBYP is applied. If VBYP is not used, then connect to GND. VCC Internal regulator output 5V Linear Regulator Output for Internal Control Circuit. Bypass VCC to AGND with a 2.2µF capacitor. VCC can only supply internal circuits. Do not connect to external loads. BOOT Bootstrap supply test point Bootstrap Supply for High-Side Gate Driver. A capacitor is needed to drive the power switch's gate above the supply voltage. It is connected between the SW and BOOT pins to form a floating supply across the power switch driver. SW Switch node test point Switch Node. EVB_RT6219AGQW-00 October 2015 3 http://www.richtek.com RT6219AGQW Evaluation Board your power partner. Power-up & Measurement Procedure 1. Connect input power (5V < VIN < 23V) and input ground to VIN and GND test pins respectively. 2. Connect positive end and negative terminals of load to VOUT and GND test pins respectively. 3. There is a 3-pin header “J5” for enable control. To use a jumper at “VDD” option to tie EN test pin to input power VIN for enabling the device. Inversely, to use a jumper at “GND” option to tie EN test pin and ground GND for disabling the device. 4. Verify the output voltage (approximately 5V) between VOUT and GND. 5. Connect an external load up to 4A to the VOUT and GND terminals and verify the output voltage and current. Output Voltage Setting Set the output voltage with the resistive divider (R8, R4) between VOUT and GND with the midpoint connected to FB. The output is set by the following formula : VOUT = VFB x (1 + EVB_RT6219AGQW-00 R4 ) R8 October 2015 4 http://www.richtek.com RT6219AGQW Evaluation Board your power partner. Schematic, Bill of Materials & Board Layout EVB Schematic Diagram Bill of Materials Reference Qty Part Number Description Package Manufacture U2 1 RT6219AGQW DC/DC Converter WDFN-10L 3x3 RICHTEK C1, C2 2 4.7µF/25V C-1206 C4 1 22pF/50V C-0603 C9 1 220nF/50V C-0603 C10, C11, C12, C14, C18, R3 6 NC NC C13 1 2.2µF/50V C-0603 C15, C16, C17 3 22µF/6.3V/0805 C-0805 C19 1 0.1µF/50V C-0603 L1 1 2.2µH R1, R5 2 100K R-0603 R2, R9 2 0 R-0603 R4 1 22k R-0603 R6 1 10M R-0603 R8 1 3k R-0603 EVB_RT6219AGQW-00 October 2015 NC 5 NC http://www.richtek.com RT6219AGQW Evaluation Board your power partner. PCB Layout Top View (1st layer) PCB Layout—Inner Side (2nd Layer) EVB_RT6219AGQW-00 October 2015 6 http://www.richtek.com RT6219AGQW Evaluation Board your power partner. PCB Layout—Inner Side (3rd Layer) Bottom View EVB_RT6219AGQW-00 October 2015 7 http://www.richtek.com RT6219AGQW Evaluation Board your power partner. Bottom View (4th Layer) 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_RT6219AGQW-00 October 2015 8 http://www.richtek.com