ADP1607-EVALZ

Evaluation Board User Guide UG-488 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com Evaluating the ADP1607 2 MHz, Synchronous Boost, DC-to-DC Converter FEATURES The ADP1607 is a high efficiency, synchronous, fixed frequency, step-up dc-to-dc switching converter with an adjustable output voltage between 1.8 V and 3.3 V for use in portable applications. 0.8 V to VOUT input voltage range Low 0.9 V input start-up voltage Fixed 2 MHz PWM and light load PFM mode options Auto PFM/PWM transition modes (ADP1607-EVALZ) PWM mode only (ADP1607-001-EVALZ) 3.3 V output voltage Jumper for enable/shutdown control R1 and R2 selected for VOUT = 3.3 V output voltages The 2 MHz operating frequency enables the use of small footprint, low profile external components. Additionally, the synchronous rectification, internal compensation, internal fixed current limit, and current mode architecture allow for excellent transient response and a minimal external part count. Other key features include fixed PWM and light load PFM mode options, true output isolation, thermal shutdown (TSD), and logic controlled enable. GENERAL DESCRIPTION The ADP1607 evaluation board is a complete step-up, dc-to-dc switching converter application with components selected to allow operation over the full input voltage and load ranges for VOUT = 3.3 V. The boost converter is set to transition automatically between PFM and PFM (ADP1607-EVALZ) or fixed to operate in PWM mode only (ADP1607-001-EVALZ). The evaluation boards can be adjusted for different output voltages by changing the feedback resistors, R1 and R2. This user guide includes I/O descriptions, setup instructions, and the schematic and PCB layout drawings for the ADP1607 step-up converter evaluation board. Complete specifications for the ADP1607 are available in the ADP1607 data sheet and should be consulted in conjunction with this document when using the evaluation board. TYPICAL APPLICATION CIRCUIT L 2.2µH INPUT VOLTAGE 0.8V TO VOUT ADP1607 1 ADJUSTABLE OUTPUT VOLTAGE 1.8V TO 3.3V SW 5 VIN CIN 10µF VOUT 6 R1 2 EN GND FB 3 4 R2 Figure 1. Step-Up Regulator Configuration PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 8 COUT 10µF 11089-001 ON OFF UG-488 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Evaluation Setup ............................................................................3 General Description ......................................................................... 1 Performance Evaluation ...............................................................3 Typical Application Circuit ............................................................. 1 Evaluation Board Schematic and Layout........................................4 Revision History ............................................................................... 2 Layout Guidelines..........................................................................4 Evaluation Board Hardware ............................................................ 3 Ordering Information .......................................................................5 Input/Output Connectors ........................................................... 3 Bill of Materials ..............................................................................5 REVISION HISTORY 11/12—Revision 0: Initial Version Rev. 0 | Page 2 of 8 Evaluation Board User Guide UG-488 EVALUATION BOARD HARDWARE The ADP1607 evaluation board is fully assembled and tested. The following sections describe the various connectors on the board, the proper evaluation setup, and the testing capabilities of the evaluation board. INPUT/OUTPUT CONNECTORS EVALUATION SETUP To ensure proper operation of the ADP1607 evaluation board: 1. 2. 3. EN Test Bus The EN connector is used to enable/disable the converter via the EN pin. Use one of the following methods to enable the converter. Do not leave the EN pin floating. PERFORMANCE EVALUATION Use a jumper to connect the top two pins of the EN test bus. This connects EN to VIN and enables the converter (see Figure 2). PLACE JUMPER HERE The following sections discuss tests and the resulting oscilloscope waveforms. Oscilloscope waveforms and typical performance characteristics are provided in the ADP1607 data sheet. Line Regulation 11089-002 • 4. 5. The line regulation is observed and measured by monitoring the output voltage (VOUT) while varying the input voltage (VIN). Figure 2. Enabled Jumper Position Use a jumper to connect the bottom two pins of the EN test bus. This connects EN to GND and disables the converter (see Figure 3). PLACE JUMPER HERE 11089-003 • 11089-004 Alternatively, connect a voltage between VIN and GND to the center pin of the EN test bus for independent control of the EN pin voltage (see Figure 4). CONNECT EXTERNAL DEVICE HERE Load Regulation The load regulation is observed and measured by monitoring the output voltage (VOUT) while sweeping the applied load between VOUT and GND. To minimize voltage drop, use short low resistance wires, especially for heavy loads. Efficiency Figure 3. Disabled Jumper Position • Connect the input supply ground to GND. Connect the positive input supply to VIN. Connect the desired load between VOUT and GND. The maximum continuous output current of the ADP1607 is dependent upon the input and output voltage conditions. Apply a voltage between 0.9 V and VOUT to the VIN test bus. Move the jumper on the EN test bus to the enabled position. The efficiency, η, is measured by comparing the input power to the output power. η= VOUT × I OUT VIN × I IN Line Transient Figure 4. EN Pin Direct Connection VIN Test Bus The VIN test bus connects the positive input supply voltage to the VIN pin. Connect the power supply to this bus and keep the wires as short as possible to minimize EMI transmissions. SW Test Point The SW test point is for monitoring the switch node (SW pin) behavior and switching frequency. Connect a BNC cable to this test point to measure the ADP1607 switching frequency. VOUT Test Bus The output voltage at the VOUT test bus is set by the resistive voltage divider network, R1 and R2. A load can be attached from the VOUT test bus to the GND test bus. GND Test Bus The GND test bus is the power ground connection for the part via the GND pin as well as the bypass capacitors. Connect ground connections from external equipment to this bus. The line transient performance is evaluated by generating a high speed voltage transient on the input (VIN) and observing the behavior of the evaluation board at the output (VOUT). Load Transient The load transient performance is evaluated by generating a fast current transient on the output (VOUT) and observing the behavior of the evaluation board at the output (VOUT.) Oscillator Frequency The oscillator frequency can be measured by connecting an oscilloscope to the SW pin. Inductor Current The inductor current is made accessible by removing one side of the inductor from its pad and connecting a current loop in series. Place an oscilloscope current probe on the loop to view the current waveform. Rev. 0 | Page 3 of 8 UG-488 Evaluation Board User Guide EVALUATION BOARD SCHEMATIC AND LAYOUT SW L1 ADP1607 (U1) ADP1607ACPZN-R7 ADP1607ACPZN001-R7 VIN 1 VIN SW 5 VOUT C1 EN VOUT 6 R1 2 EN C3 FB 3 GND C4 R2 4 GND 11089-005 C2 Figure 5. ADP1607 Boost Application Evaluation Board Schematic LAYOUT GUIDELINES For high efficiency, good regulation, and stability, a welldesigned printed circuit board layout is required. Use the following guidelines when designing printed circuit boards. • • 11089-006 • Figure 6. ADP1607 Boost Application Printed Circuit Board (PCB) Top Layer • • 11089-007 • Figure 7. ADP1607 Boost Application PCB Bottom Layer Rev. 0 | Page 4 of 8 Keep the low ESR input capacitor, C1, close to VIN and GND. This minimizes noise injected into the part from board parasitic inductance. Keep the high current path from C1 through the L1 inductor to SW as short as possible. Place the feedback resistors, R1 and R2, as close to FB as possible to prevent noise pickup. Connect the ground of the feedback network directly to an AGND plane that makes a Kelvin connection to the GND pin. Avoid routing high impedance traces from feedback resistors near any node connected to SW or near the inductor to prevent radiated noise injection. Keep the low ESR output capacitor, C3, close to VOUT and GND. This minimizes noise injected into the part from board parasitic inductance. Connect Pin 7 (EPAD) and GND to a large copper plane for proper heat dissipation. Evaluation Board User Guide UG-488 ORDERING INFORMATION BILL OF MATERIALS Table 1. ADP1607-EVALZ (Automatic PFM/PWM Switching Modes, VOUT = 3.3 V) Qty 1 1 1 1 1 1 1 1 1 1 4 1 2 Reference Designator U1 L1 C1 C2 C3 C4 R1 R2 EN SW VIN, VOUT, GND (2) Description ADP1607 automatic PFM/PWM switching modes Inductor, 2.2 µH, 1.26 A Input capacitor, 10 µF, 10 V, 0603, ±20% Input capacitor Output capacitor, 10 µF, 10 V, 0603, ±20% Output capacitor Output voltage divider top resistor, 392 kΩ, ±1% Output voltage divider bottom resistor, 243 kΩ, ±1% Headers, 0.100 in, single, straight, 3-pin Headers, 0.100 in, single, straight, 1-pin Test point loop connectors Manufacturer 1 Analog Devices, Inc. TDK Taiyo Yuden Open Taiyo Yuden Open Vishay Dale Vishay Dale Sullins Connector Solutions Sullins Connector Solutions Aavid Thermalloy Part Number ADP1607ACPZN-R7 VLF302512MT-2R2M LMK107BJ106MALTD Manufacturer 1 Analog Devices, Inc. TDK Taiyo Yuden Open Taiyo Yuden Open Vishay Dale Vishay Dale Sullins Connector Solutions Sullins Connector Solutions Aavid Thermalloy Part Number ADP1607ACPZN001-R7 VLF302512MT-2R2M LMK107BJ106MALTD LMK107BJ106MALTD CRCW0805392KFKEA CRCW0805243KFKEA PBC03SAAN 2 PBC01SAAN2 125800D00000G Equivalent substitutions may be made for all resistors and capacitors. Alternatively, PBC36SAAN can be purchased and cut as necessary. Table 2. ADP1607-001-EVALZ (PWM Mode Only, VOUT = 3.3 V) Qty 1 1 1 1 1 1 1 1 1 1 4 1 2 Reference Designator U1 L1 C1 C2 C3 C4 R1 R2 EN SW VIN, VOUT, GND (2) Description ADP1607 PWM mode only Inductor, 2.2 µH, 1.26 A Input capacitor, 10 µF, 10 V, 0603, ±20% Input capacitor Output capacitor, 10 µF, 10 V, 0603, ±20% Output capacitor Output voltage divider top resistor, 392 kΩ, ±1% Output voltage divider bottom resistor, 243 kΩ, ±1% Headers, 0.100 in, single, straight, 3-pin Headers, 0.100 in, single, straight, 1-pin Test point loop connectors Equivalent substitutions may be made for all resistors and capacitors. Alternatively, PBC36SAAN can be purchased and cut as necessary. Rev. 0 | Page 5 of 8 LMK107BJ106MALTD CRCW0805392KFKEA CRCW0805243KFKEA PBC03SAAN 2 PBC01SAAN2 125800D00000G UG-488 Evaluation Board User Guide NOTES Rev. 0 | Page 6 of 8 Evaluation Board User Guide UG-488 NOTES Rev. 0 | Page 7 of 8 UG-488 Evaluation Board User Guide NOTES ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality. Legal Terms and Conditions By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term “Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed. ©2012 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG11089-0-11/12(0) Rev. 0 | Page 8 of 8