650 kHz/1.3 MHz Step-Up Converter Evaluation Board Documentation EVAL-ADP1612/ADP1613 The ADP1612/ADP1613 evaluation module operates in pulse-width modulation (PWM) current mode with up to 94% efficiency. The shunt-selectable switching frequency and PWM current-mode architecture allow for excellent transient response, easy noise filtering, and the use of small, cost-saving external inductors and capacitors. Other key features include a 33 nF soft start capacitor, undervoltage lockout (UVLO), thermal shutdown (TSD), and jumper selected enable. The evaluation module demonstrates the operation and performance of the ADP1612/ADP1613. FEATURES Input voltage range 1.8 V to 5.5 V for the ADP1612-5-EVALZ 2.5 V to 5.5 V for the ADP1613-12-EVALZ Output voltage 5 V for ADP1612-5-EVALZ 12 V for ADP1613-12-EVALZ Shunt-selectable 1.3 MHz or 650 kHz switching frequency Jumper for enable/shutdown control Components optimized for the indicated output voltages This data sheet includes I/O descriptions, setup instructions, the schematic, and the PCB layout drawings for the ADP1612/ ADP1613 step-up converter evaluation module. Use this data sheet in conjunction with the ADP1612/ADP1613 data sheet available on www.analog.com. GENERAL DESCRIPTION The ADP1612/ADP1613 evaluation module is a complete stepup dc-to-dc switching converter application with components selected to allow operation over the full range of input and load conditions for the 5 V (ADP1612) and 12 V (ADP1613) output voltages. The evaluation boards can be adjusted for different output voltages by changing R1 and R2. In addition, L1, D1, C3, and R3 may need to be adjusted and should be recalculated to ensure stable operation. TYPICAL APPLICATION CIRCUIT L1 ADP1612/ ADP1613 VIN 6 VIN 3 EN U1 D1 ON CIN R1 FB 2 1.3MHz 650kHz (DEFAULT) 7 FREQ 8 SS CSS R2 COMP 1 GND 4 RCOMP CCOMP COUT 06772-002 OFF VOUT SW 5 Figure 1. Step-Up Regulator Configuration Rev. A Evaluation boards are only intended for device evaluation and not for production purposes. Evaluation boards are supplied “as is” and without warranties of any kind, express, implied, or statutory including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose. No license is granted by implication or otherwise under any patents or other intellectual property by application or use of evaluation boards. Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Analog Devices reserves the right to change devices or specifications at any time without notice. Trademarks and registered trademarks are the property of their respective owners. Evaluation boards are not authorized to be used in life support devices or systems. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. www.analog.com Tel: 781.329.4700 Fax: 781.461.3113 ©2009–2010 Analog Devices, Inc. All rights reserved. EVAL-ADP1612/ADP1613 TABLE OF CONTENTS Features .............................................................................................. 1 Evaluation Board Schematic and Layout .......................................5 General Description ......................................................................... 1 Layout Guidelines..........................................................................5 Typical Application Circuit ............................................................. 1 Ordering Information .......................................................................6 Revision History ............................................................................... 2 Bill of Materials ..............................................................................6 Evaluation Board Hardware ............................................................ 3 Ordering Guide .............................................................................7 Input/Output Connectors ........................................................... 3 ESD Caution...................................................................................7 Evaluation Setup ........................................................................... 3 Performance Evaluation .............................................................. 4 REVISION HISTORY 1/10—Rev. 0 to Rev. A Changes to Figure 4 to Figure 6 ...................................................... 3 12/09—Revision 0: Initial Version Rev. A | Page 2 of 8 EVAL-ADP1612/ADP1613 EVALUATION BOARD HARDWARE The ADP1612/ADP1613 evaluation module 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 module. VOUT Test Bus INPUT/OUTPUT CONNECTORS VIN Test Bus EN 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 the EMI transmission. 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. • 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. 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). SW Test Point 08527-003 PLACE JUMPER HERE The SW test point is for measuring the switch node (SW pin) behavior and switching frequency. Figure 2. Enabled Jumper Position • The output voltage at the VOUT test bus is set by the resistive voltage divider network, R1 and R2. A load can be attached to the VOUT test bus. 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). EVALUATION SETUP Follow these setup instructions to ensure proper operation of the ADP1612/ADP1613 evaluation module: 08527-004 1. PLACE JUMPER HERE Figure 3. Disabled Jumper Position • 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). 08527-005 CONNECT EXTERNAL DEVICE HERE Figure 4. EN Pin Direct Connection 0 Ω Shunt FREQ (R4) 2. 3. 4. 5. 6. This shunt selects the switching frequency via the FREQ pin. Several methods are available as follows. Shunt the top pads of FREQ (R4) for 1.3 MHz operation (see Figure 5). PLACE SHUNT HERE 08527-006 • Figure 5. 1.3 MHz Operation Shunt Position Shunt the bottom pads of FREQ (R4) for 650 kHz operation (see Figure 6). PLACE SHUNT HERE 08527-007 • Figure 6. 650 kHz Operation Shunt Position • If this shunt is left open, the part defaults to 650 kHz. Rev. A | Page 3 of 8 Select the passive components for the bypass capacitance, desired output voltage, compensation, and start-up time, using the applications information from the ADP1612/ ADP1613 data sheet. 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 ADP1612/ ADP1613 is dependent upon the input and output conditions. Apply a voltage between 1.8 V and 5.5 V (ADP1612) or 2.5 V and 5.5 V (ADP1613) to the VIN test bus. Move the jumper on the EN test bus to the enabled position. EVAL-ADP1612/ADP1613 PERFORMANCE EVALUATION Line Transient The following sections discuss tests and the resulting oscilloscope waveforms. Oscilloscope waveforms and typical performance characteristics are provided in the ADP1612/ ADP1613 data sheet. The line transient performance is evaluated by generating a high speed voltage transient on the input (VIN) and observing the behavior of the evaluation module at the inductor (SW) and the output (VOUT.) Line Regulation Load Transient The line regulation is observed and measured by monitoring the output voltage (VOUT) while varying the input voltage (VIN). The load transient performance is evaluated by generating a fast current transient on the output (VOUT) and observing the behavior of the evaluation module at the inductor (SW) and the output (VOUT.) 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. Oscillator Frequency The oscillator frequency can be measured by connecting an oscilloscope to the SW pin. Efficiency Inductor Current The efficiency, η, is measured by comparing the input power to the output power 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. η= VOUT × I OUT V IN × I IN Rev. A | Page 4 of 8 EVAL-ADP1612/ADP1613 EVALUATION BOARD SCHEMATIC AND LAYOUT L1 SW ADP1612/ ADP1613 VIN EN 6 VIN 3 EN 7 FREQ 8 SS U1 VOUT D1 SW 5 R1 FB 2 C7 C8 C9 R2 COMP 1 GND C1 C4 R3 4 C3 C2 C5 C6 GND 08527-008 FREQ R4 Figure 7. ADP1612/ADP1613Boost Application Evaluation Board Schematic LAYOUT GUIDELINES For high efficiency, good regulation, and stability, a welldesigned printed circuit board (PCB) layout is essential. Use the following guidelines when designing PCBs: • • • 08527-009 • • Figure 8. ADP1612/ADP1613 Boost Application PCB Top Layer • • 08527-010 • Figure 9. ADP1612/ADP1613 Boost Application PCB Bottom Layer Rev. A | Page 5 of 8 Keep the low ESR input capacitor, CIN (labeled as C7 in Figure 8), close to VIN and GND. This minimizes noise injected into the part from board parasitic inductance. Keep the high current path from CIN (labeled as C7 in Figure 8) through the L1 inductor to SW and GND as short as possible. Keep the high current path from VIN through L1, the rectifier (D1), and the output capacitor, COUT (labeled as C4 in Figure 8), as short as possible. Keep high current traces as short and as wide as possible. Place the feedback resistors as close to FB as possible to prevent noise pickup. Connect the ground of the feedback network directly to an AGND plane to make a Kelvin connection to the GND pin. Place the compensation components as close as possible to COMP. Connect the ground of the compensation network directly to an AGND plane that makes a Kelvin connection to the GND pin. Connect the soft start capacitor, CSS (labeled as C1 in Figure 8), as close to the device as possible. Connect the ground of the soft start capacitor to an AGND plane that makes a Kelvin connection to the GND pin. Avoid routing high impedance traces from the compensation and feedback resistors near any node connected to SW or near the inductor to prevent radiated noise injection. EVAL-ADP1612/ADP1613 ORDERING INFORMATION BILL OF MATERIALS Table 1. ADP1612 (VOUT = 5 V) Qty 1 1 1 1 1 1 1 1 1 1 1 10 1 Reference Designator U1 L1 D1 C1 C2 C3 C4 C5 C6 C7 C8 C9 R1 R2 R3 FREQ/R4 EN, VIN, SW, VOUT, GND Description ADP1612 step-up converter Inductor, 4.7 μH Diode Soft start capacitor, MLCC, 33 nF, 50 V, 0805, ±10% Compensation capacitor Compensation capacitor, 1200 pF, 50 V, 0805, ±10% Output capacitor, 10 µF, 25 V, 1206, ±10% Output capacitor Output capacitor Input capacitor, 10 μF, 16 V, 0805, ±10% Input capacitor Input capacitor Output voltage divider, 30.0 kΩ, 0805, ±1% Output voltage divider, 10.0 kΩ, 0805, ±1% Compensation resistor, 12 kΩ, 0805, ±5% Frequency select shunt resistor, 0 Ω, 0805, 1.3 MHz (top 2 pads) Header (0.10”, single/double row, straight) Manufacturer 1 Analog Devices, Inc. Coilcraft ON Semiconductor Panasonic–ECG Open Panasonic–ECG Taiyo Yuden Open Open Taiyo Yuden Open Open Yageo Vishay/Dale Yageo Yageo Sullins Electronics Part Number ADP1612 DO3316P-472ML MBRS2040LT3 ECJ-2VB1H333K ECJ-2VB1H122K TMK316BJ106KL-T EMK212BJ106KG-T RC0805FR-0730KL CRCW080510K0FKEA RC0805JR-0712KL RC0805JR-070RL PBC36SAAN Equivalent substitutions may be made for all resistors and capacitors. Table 2. ADP1613 (VOUT = 12 V) Qty 1 1 1 1 1 1 1 1 1 1 1 10 1 Reference Designator U1 L1 D1 C1 C2 C3 C4 C5 C6 C7 C8 C9 R1 R2 R3 FREQ/R4 EN, VIN, SW, VOUT, GND Description ADP1613 step-up converter Inductor, 6.8 μH Diode Soft start capacitor, 33 nF, 50 V, 0805, ±10% Compensation capacitor Compensation capacitor, 1000 pF, 50 V, 0805, ±10% Output capacitor, 10 μF, 25 V, 1206, ±10% Output capacitor Output capacitor Input capacitor, 10 μF, 16 V, 0805, ±10% Input capacitor Input capacitor Output voltage divider, 86.6 kΩ, 0805, ±1% Output voltage divider, 10.0 kΩ, 0805, ±1% Compensation resistor, 10 kΩ, 0805, ±5% Frequency select shunt resistor, 0 Ω, 0805, 1.3 MHz (top 2 pads) Header (0.10”, single/double row, straight) Equivalent substitutions may be made for all resistors and capacitors. Rev. A | Page 6 of 8 Manufacturer 1 Analog Devices, Inc. Coilcraft ON Semiconductor Panasonic–ECG Open Panasonic–ECG Taiyo Yuden Open Open Taiyo Yuden Open Open Yageo Vishay/Dale Yageo Yageo Sullins Electronics Part Number ADP1613 DO3316P-682ML MBRA340T3G ECJ-2VB1H333K ECJ-2VB1H102K TMK316BJ106KL-T EMK212BJ106KG-T RC0805FR-0786K6L CRCW080510K0FKEA RC0805JR-0710KL RC0805JR-070RL PBC36SAAN EVAL-ADP1612/ADP1613 ORDERING GUIDE Model1 ADP1612-5-EVALZ ADP1612-BL1-EVZ ADP1613-12-EVALZ ADP1613-BL1-EVZ 1 ESD CAUTION Description ADP1612 Evaluation Board, 5 V Output Voltage Configuration ADP1612 Blank Evaluation Board ADP1613 Evaluation Board, 12 V Output Voltage Configuration ADP1613 Blank Evaluation Board Z = RoHS Compliant Part. Rev. A | Page 7 of 8 EVAL-ADP1612/ADP1613 NOTES ©2009–2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. EB08527-0-1/10(A) Rev. A | Page 8 of 8