EVB_RT6212AHGJ6F

RT6212AHGJ6F Evaluation Board your power partner. 2A, 18V, 500kHz, ACOT™ Step-Down Converter Purpose The RT6212A is a synchronous step-down converter with the input voltage range from 4.5V to 18V and provides 2A output current. This document explains the function and use of the RT6212A 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_RT6212AHGJ6F-00 October 2015 1 http://www.richtek.com RT6212AHGJ6F Evaluation Board your power partner. Introduction General Product Information The RT6212A is a high-efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 2A output current from a 4.5V to 18V input supply. The RT6212A 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 current protection, and thermal shutdown. Product Feature         Integrated 163mΩ/86mΩ MOSFETs 4.5V to 18V Supply Voltage Range 500kHz Switching Frequency ACOT Control 0.8V±1.5% Voltage Reference Internal Start-Up into Pre-biased Outputs Compact Package : TSOT-23-6 Pin Over-Current Protection and Hiccup Key Performance Summary Table Key Features Evaluation Board Number : PCB039_V1 Default Input Voltage 12V Max Output Current 2A Default Output Voltage 1.2V Default Marking & Package Type RT6212AHGJ6F, TSOT-23-6 (FC) Operation Frequency Fixed 500kHz EVB_RT6212AHGJ6F-00 October 2015 2 http://www.richtek.com RT6212AHGJ6F 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 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 Floating this pin or connecting this pin to GND can disable the device and connecting this pin to logic high can enable the device. GND Ground System Ground. Provides the ground return path for the control circuitry and low-side power MOSFET. BOOT Bootstrap supply test point Bootstrap Supply for High-Side Gate Driver. Connect a 0.1µF or greater capacitor from LX to BOOT to power the high-side switch. FB Feedback Voltage Input. This pin is used to set the desired output voltage via an external resistive divider. The feedback voltage is 0.8V typically. LX Switch node test point LX is the switching node that supplies power to the output and connect the output LC filter from LX to the output load. EVB_RT6212AHGJ6F-00 October 2015 3 http://www.richtek.com RT6212AHGJ6F Evaluation Board your power partner. Power-up & Measurement Procedure 1. Apply a 12V nominal input power supply (4.5V < VIN < 18V) to the VIN and GND terminals. 2. Set the jumper at JP2 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 2A 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 = 0.8 x (1 + R2 ) R3 EVB_RT6212AHGJ6F-00 October 2015 4 http://www.richtek.com RT6212AHGJ6F 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 RT6212AHGJ6F DC/DC Converter TSOT-23-6 (FC) RICHTEK C3, C9 2 C3225X5R1E226MT 22µF/25V/X7R C-1210 TDK C8 1 C1608X7R1H104K080AA 0.1µF/±10%/50V/X7R C-0603 TDK C1, C4, C6, C10, C11, C12, D2 7 N/A R2 1 12kΩ R-0603 R3 1 24kΩ R-0603 R5 1 100kΩ R-0603 L1 1 2.2µH/12.5A 8.4 x 7.9 x 7.2 mm EVB_RT6212AHGJ6F-00 7443340220 October 2015 5 WE http://www.richtek.com RT6212AHGJ6F Evaluation Board your power partner. PCB Layout Top View (1st layer) PCB Layout—Inner Side (2nd Layer) EVB_RT6212AHGJ6F-00 October 2015 6 http://www.richtek.com RT6212AHGJ6F Evaluation Board your power partner. PCB Layout—Inner Side (3rd Layer) Bottom View (4th Layer) EVB_RT6212AHGJ6F-00 October 2015 7 http://www.richtek.com RT6212AHGJ6F 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 T O BUYER OR USER FOR ANY AND ALL DAMAGES INCLUDING WITHOUT LIMITATION TO DIRECT, INDIRECT, SPECIAL, PUNITIVE OR CONSEQUENTIAL DAMAGES. EVB_RT6212AHGJ6F-00 October 2015 8 http://www.richtek.com