EVB_RTQ2131BGQW-QA

RTQ2131BGQW-QA Evaluation Board your power partner. RTQ2131B, 36V, 1A, Synchronous Step-Down Converter Evaluation Board General Description The Evaluation Board demonstrates the RTQ2131B to be designed for a 5V/1.0A output from a 7V to 25V input at 2.1MHz switching frequency. The RTQ2131B can apply to other output voltages by changing the resistive divider for input voltages support up to 36V. For more application circuits, please refer to the RTQ2131B datasheet. The wide input range makes it suitable for automotive systems and car camera module. The RTQ2131B provides complete protection functions such as input under-voltage lockout, output under-voltage protection, over-current protection, and thermal shutdown. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. Table of Contents General Description ............................................................................................................................................... 1 Performance Sepcification Summary ..................................................................................................................... 2 Power-up Procedure .............................................................................................................................................. 2 Detailed Description of Hardware ........................................................................................................................... 3 Bill of Materials ...................................................................................................................................................... 5 Typical Applications ............................................................................................................................................... 6 Evaluation Board Layout ........................................................................................................................................ 9 More Information................................................................................................................................................... 11 Important Notice for Richtek Evaluation Board ...................................................................................................... 11 EVB_RTQ2131BGQW-QA-00 November 2020 1 http://www.richtek.com RTQ2131BGQW-QA Evaluation Board your power partner. Performance Sepcification Summary Summary of the RTQ2131B Evaluation Board performance specificiaiton is provided in Table 1. The ambient temperature is 25°C. Table 1. RTQ2131BGQW Evaluation Board Performance Specification Summary Specification Test Conditions Min Typ Max Unit 7 -- 25 V Output Current 0 -- 1 A Default Output Voltage -- 5 -- V Operation Frequency -- 2100 -- kHz Input Voltage Range VOUT = 5V Output Ripple Voltage IOUT = 1A -- 10 -- mVp-p Line Regulation IOUT = 1A, VIN = 7V to 25V -- ±1 -- % Load Regulation VIN = 12V, IOUT = 0.001 A to 1A -- ±1 -- % Load Transient Response IOUT = 0A to 1A -- ±5 -- % Maximum Efficiency VIN = 12V, VOUT = 5V, IOUT = 1A -- 89.3 -- % Power-up Procedure Suggestion Required Equipments  RTQ2131B Evaluation Board  DC power supply capable of at least 36V and 1A Electronic load capable of 6A Function Generator Oscilloscope    Quick Start Procedures The Evaluation Board is fully assembled and tested. Follow the steps below to verify board operation. Caution : Do not turn on supplies until all connections are made. Note: When measuring the output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the output voltage ripple by touching the probe tip and ground ring directly across the last output capacitor. Proper measurement equipment setup and follow the procedure below. 1) With power off, connect the input power supply to VIN and GND pins. 2) With power off, connect the electronic load between the VOUT and nearest GND pins. 3) Turn on the power supply at the input. Make sure that the input voltage does not exceeds 36V on the Evaluation Board. 4) Check for the proper output voltage using a voltmeter. 5) Once the proper output voltage is established, adjust the load within the operating ranges and observe the output voltage regulation, ripple voltage, efficiency and other performance. EVB_RTQ2131BGQW-QA-00 November 2020 2 http://www.richtek.com RTQ2131BGQW-QA Evaluation Board your power partner. Detailed Description of Hardware 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. EVB_RTQ2131BGQW-QA-00 November 2020 3 http://www.richtek.com RTQ2131BGQW-QA Evaluation Board your power partner. Test Points The EVB is provided with the test points and pin names listed in the table below. Test Point/ Pin Name Function VIN Input voltage positive connection. The power supply must be connected to input connectors, VIN and GND. EN Enable test point. The test point can be used to measure the enable signal. VOUT Output voltage connection. The load must be connected to output connectors, VOUT and GND. JP1 EN jumper. Connect EN to ground to disable, connect EN to logic high to enable. PG Power-good indication test point. The test point can be used to measure the power-good singal. GND Ground. Input/Output voltage return connection. BOOT Bootstrap node test point. The test point can be used to measure the bootstrap voltage. SW Switch node test point. The test point can be used to measure the switching node. VIN_EMI Input voltage node before EMI solution. Optional for EMI requirement. VCC Linear regulator output test point. The test point can be used to measure the output node of the internal regulator. EVB_RTQ2131BGQW-QA-00 November 2020 4 http://www.richtek.com RTQ2131BGQW-QA Evaluation Board your power partner. Bill of Materials VIN = 12V, VOUT = 5V, IOUT = 1A, f SW = 2100kHz Reference Count Part Number Value Description Package Manufacturer U1 1 RTQ2131BGQW-QA RTQ2131B Step-Down Converter WDFN-10SL 3x3 RICHTEK C1, C2, C3, C4, C16 5 N/A N/A Optional for EMI requirement N/A N/A C5 1 GCM31CR71H225KA 2.2µF Capacitor, ceramic, 50V, X7R, ±10% 1206 MURATA C6, C7, C8 3 CGA3E2X7R1H104K 0.1µF Capacitor, ceramic, 50V, X7R, ±10% 0603 TDK C9, C10 2 GCM31CC71E106KA 10µF Capacitor, ceramic, 25V, X7S, ±10% 1206 MURATA C11 1 GCM188R71C105KA 1µF Capacitor, ceramic, 16V, X7R, ±10% 0603 MURATA C12 1 N/A N/A Optional N/A N/A C13 1 N/A N/A Optional N/A N/A C15 1 GCE188R71H152KA 1.5nF Capacitor, ceramic, 50V, X7R, ±10% 0603 N/A L1, L2 2 N/A N/A Optional for EMI requirement N/A N/A L3 1 WE-74437336047 4.7µH R2, R4 2 WR06X1003 100kΩ Resistor, chip, 1/10W, 1% 0603 WALSIN R3 1 WR06X1053 105k Resistor, chip, 1/10W, 1% 0603 WALSIN R5 1 WR06X2002 20k Resistor, chip, 1/10W, 1% 0603 WALSIN R6 1 WR06X3742 37.4k Resistor, chip, 1/10W, 1% 0603 WALSIN EVB_RTQ2131BGQW-QA-00 November 2020 Inductor, SMT, 5.2 x 5.2 x 2.8mm Isat = 5.9A, 50mΩ 5 Wurth Elektronik http://www.richtek.com RTQ2131BGQW-QA Evaluation Board your power partner. Typical Applications EVB Schematic Diagram 1. The capacitance values of the input and output capacitors will influence the input and output voltage ripple. 2. MLCC capacitors have degrading capacitance at DC bias voltage, and especially smaller size MLCC capacitors will have much lower capacitance. EVB_RTQ2131BGQW-QA-00 November 2020 6 http://www.richtek.com RTQ2131BGQW-QA Evaluation Board your power partner. Measure Result Output Ripple Measurement Load Transient Response VIN = 12V, VOUT = 5V, IOUT = 1A VOUT (10mV/Div) VOUT (100mV/Div) Output ripple at 1A load : 6mVpp, Frequency : 2100kHz VSW (5V/Div) VIN = 12V, VOUT = 5V, IOUT = 0A to 1A (TR = TF = 1s) Overshoot : 147mV, Undershoot : 148mV IOUT (500mA/Div) Time (500ns/Div) Time (500s/Div) Power On from EN Power Off from EN VOUT (5V/Div) VOUT (5V/Div) VIN = 12V, VOUT = 5V, IOUT = 1A VSW (10V/Div) VSW (10V/Div) VPGOOD (5V/Div) VPGOOD (5V/Div) VEN (3V/Div) VEN (3V/Div) VIN = 12V, VOUT = 5V, IOUT = 1A Time (1ms/Div) Time (1ms/Div) Soft-start time = 1.7ms Short Circuit Response – Short and Recovery VOUT (2V/Div) Strating Progile III (Cold cranking) VIN (5V/Div) VIN = 12V, VOUT = 5V, IOUT = 0A VOUT (1V/Div) VPGOOD (4V/Div) VPGOOD (2V/Div) VOUT = 5V, RLOAD = 5Ω, with external bootstrap diode ISW (1A/Div) Time (5ms/Div) EVB_RTQ2131BGQW-QA-00 November 2020 Time (200ms/Div) 7 http://www.richtek.com RTQ2131BGQW-QA Evaluation Board your power partner. Efficiency vs. Output Current Output Voltage vs. Output Current Output Voltage vs. Input Voltage Note : When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the output voltage ripple by touching the probe tip directly across the output capacitor. EVB_RTQ2131BGQW-QA-00 November 2020 8 http://www.richtek.com RTQ2131BGQW-QA Evaluation Board your power partner. Evaluation Board Layout Figure 1 to Figure 4 are RTQ2131B Evaluation Board layout. This board size is 110mm x 80mm and is constructed on four-layer PCB with 1 OZ. Cu on the outer layers and 1 OZ. Cu in the inner layers. Figure 1. Top View (1st layer) Figure 2. PCB Layout—Inner Side (2nd Layer) EVB_RTQ2131BGQW-QA-00 November 2020 9 http://www.richtek.com RTQ2131BGQW-QA Evaluation Board your power partner. Figure 3. PCB Layout—Inner Side (3rd Layer) Figure 4. Bottom View (4th Layer) EVB_RTQ2131BGQW-QA-00 November 2020 10 http://www.richtek.com RTQ2131BGQW-QA 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_RTQ2131BGQW-QA-00 November 2020 11 http://www.richtek.com