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Owner's Manual for RICHTEK models including: RTQ2522AGQW Evaluation Board, RTQ2522AGQW, Evaluation Board, Board
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DocumentDocumentyour power partner. RTQ2522AGQW(2) Evaluation Board 2A Ultra-Low Dropout Voltage LDO Regulators with Soft-Start Evalution Board Guidance General Description The Evaluation Board user guide describes the operational use of the RTQ2522A evaluation board as a reference design for demonstration and evaluation of the RTQ2522A, an ultra-low dropout (LDO) linear regulator with soft-start. Included in this user guide are setup and operating instructions, thermal and layout guidelines, a printed circuit board (PCB) layout, a schematic diagram, and a bill of materials (BOM). For more detail information, please refer to the RTQ2522A datasheet Table of Contents General Description ......................................................................................................................................................1 Performance Sepcification Summary ...........................................................................................................................2 Power-up Procedure .....................................................................................................................................................2 Detailed Description of Hardware .................................................................................................................................3 Bill of Materials..............................................................................................................................................................4 Typical Applications ......................................................................................................................................................5 Evaluation Board Layout...............................................................................................................................................8 More Information.........................................................................................................................................................10 Important Notice for Richtek Evaluation Board...........................................................................................................10 EVB_RTQ2522AGQW(2)-00 March 2023 1 http://www.richtek.com your power partner. RTQ2522AGQW(2) Evaluation Board Performance Specification Summary Summary of the RTQ2522A Evaluation Board performance specificiaiton is provided in Table 1. The ambient temperature is 25°C. Table 1. RTQ2522A Evaluation Board Performance Specification Summary Specification Test Conditions Min Typ Max Unit Input Voltage Range VOUT + Vdrop 1.1 5.5 V VBIAS Pin Voltage 2.7 -- 5.5 V Output Voltage Range Vin = 5V, IOUT = 2A 0.8 0.8 3.6 V Line Regulation VOUT (normal) + 0.3V VIN 5.5V -- 0.03 -- %/V Load Regulation 50mA IOUT 2A -- 0.09 -- %/A VIN Dropout Voltage IOUT = 2A, VBIAS VOUT (normal) 3.25V -- 100 150 mV VBIAS Dropout Voltage VOUT = 80% x VOUT (normal) -- 1.55 1.8 V Power-up Procedure Suggestion Required Equipments RTQ2522A Evaluation Board DC power supply capable of at least 5.5V and 2A Electronic load capable of 2A Function Generator Oscilloscope Quick Start Procedures The Evaluation Board is fully assembled and tested. Follow the steps below to verify board operation. Do not turn on supplies until all connections are made. 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 groundring 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 6V 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, quiescent current, dropout voltage, PSRR, noise and other performance. EVB_RTQ2522AGQW(2)-00 March 2023 2 http://www.richtek.com your power partner. Detailed Description of Hardware Headers Description and Placement RTQ2522AGQW(2) Evaluation Board 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 Function VIN Supply input pin. VOUT Output of the regulator. PG Power good sense pin. VBIAS Input pin of bias voltage. EN Enable sense pin. GND System ground pin. SS Soft-start capacitor waveform sense pin. ENABLE User can decide EN pin connected to high or low. BIAS-EN/VIN-EN Decision of EN pin pull-high voltage source. BIAS-PG/VOUT-PG Decision of PG pull-high voltage source. EVB_RTQ2522AGQW(2)-00 March 2023 3 http://www.richtek.com your power partner. Bill of Materials RTQ2522AGQW(2) Evaluation Board VIN = 1.1V to 6.5V, VOUT = 0.8V to 5.5V, IOUT = 2A Reference Count Part Number Value Description Package Manufacturer U1 1 RTQ2522AGQW(2) RTQ2522A LDO WDFN-10L 3x3 RICHTEK C1 1 TMK212BJ475KG-T 4.7F Capacitor, ceramic, 25V, X5R 0805 TAIYO YUDEN C3 1 GRM21BR71A106KE51L 10F Capacitor, ceramic, 10V, X7R 0805 MURATA CBIAS 1 0805B105K250CT 1F Capacitor, ceramic, 25V, X7R 0805 WALSIN CSS 1 0603B102K500CT 1nF Capacitor, ceramic, 50V, X7R 0603 WALSIN R1, R5 2 WR06X000 PTL 0 Resistor, chip 0603 WALSIN REN1, REN2, RPG1, 4 RPG2 WR06X1003FTL 100k Resistor, chip 0603 WALSIN EVB_RTQ2522AGQW(2)-00 March 2023 4 http://www.richtek.com your power partner. Typical Applications EVB Schematic Diagram RTQ2522AGQW(2) Evaluation Board 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_RTQ2522AGQW(2)-00 March 2023 5 http://www.richtek.com your power partner. Measure Result Power Up Response RTQ2522AGQW(2) Evaluation Board Enable Voltage Threshold vs. Temperature VBIAS Voltage UVLO vs. Temperature Dropout Voltage vs. Output Current Output Spectral Noise Density VIN PSRR vs. Frequency EVB_RTQ2522AGQW(2)-00 March 2023 6 http://www.richtek.com your power partner. Load Transient Response RTQ2522AGQW(2) Evaluation Board OCP Short Protection Bode Plot 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_RTQ2522AGQW(2)-00 March 2023 7 http://www.richtek.com your power partner. RTQ2522AGQW(2) Evaluation Board Evaluation Board Layout Figure 1 to Figure 4 are RTQ2522A Evaluation Board layout. This board is constructed on four-layer PCB, outer layers with 1 oz. Cu and inner layers with 1 oz. Cu. Figure 1. Top View (1st layer) Figure 2. PCB Layout--Inner Side (2nd Layer) EVB_RTQ2522AGQW(2)-00 March 2023 8 http://www.richtek.com your power partner. RTQ2522AGQW(2) Evaluation Board Figure 3. PCB Layout--Inner Side (3rd Layer) Figure 4. Bottom View (4th Layer) EVB_RTQ2522AGQW(2)-00 March 2023 9 http://www.richtek.com your power partner. RTQ2522AGQW(2) Evaluation Board 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_RTQ2522AGQW(2)-00 March 2023 10 http://www.richtek.com