EVAL-ADP2106 ADP2106 ADP2106-1 ADP2106-EVAL GRM21BR61A106KE19L ADP2106EVAL

Converter Solution EVAL-ADP2106 FEATURES GENERAL DESCRIPTION Efficiency >95% Input voltage range: 2.7 V to 5.5 V Output

Evaluation Board for Step-Down DC-to-DC Converter Solution EVAL-ADP2106 EVAL-ADP2106 FEATURES GENERAL DESCRIPTION Efficiency >95% Input voltage range: 2.7 V to 5.5 V Output voltage range: 0.8 V to VIN Maximum output current: 1.5 A Switching frequency: 1.2 MHz Quiescent current: 20 A Shutdown current: 0.1 A Enable/shutdown logic input Optimized for small ferrite core inductors Optimized for tiny ceramic input and output capacitors Programmable soft start with single capacitor Programmable compensation for optimizing transient performance with a resistor and a capacitor The ADP2106 ADP2106 evaluation board is a complete step-down dc-to-dc converter solution using the ADP2106 ADP2106 step-down dc-to-dc converter. It provides a ±1% accurate (±3% over all conditions) regulated output voltage with load currents up to 1.5 A. It comes in two versions: the ADP2106-1 ADP2106-1.8-EVAL with fixed output voltage of 1.8 V, and the ADP2106-EVAL ADP2106-EVAL with adjustable output voltage initially set to 2.5 V. The ADP2106 ADP2106 is a synchronous, step-down dc-to-dc converter that uses a current-mode pulse width modulation (PWM) control scheme at medium-to-heavy load currents for high efficiency, but smoothly transitions to a pulse frequency modulation (PFM) scheme at light loads to conserve power. The power switch and synchronous rectifier are integrated for minimal external part count and high efficiency. The ADP2106 ADP2106 has been optimized for operation with small ferrite core inductors and tiny ceramic capacitors to deliver the maximum output power per square inch of the PCB board area. For more details, see the ADP2106 ADP2106 data sheet. FUNCTIONAL BLOCK DIAGRAM ADP2106 ADP2106 EVALUATION BOARD VIN J1 R2 GND ENB GND R3 C4 C7 C1 L1 R4 R5 R1 ADP2106 ADP2106 VOUT C6 C2 C3 VOUT: ANALOG DEVICES, POWER MANAGEMENT (STP) 06313-001 C5 Figure 1. Rev. 0 Evaluation boards are only intended for device evaluation and not for production purposes. Evaluation boards as 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. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2007 Analog Devices, Inc. All rights reserved. EVAL-ADP2106 EVAL-ADP2106 TABLE OF CONTENTS Features . 1 Modifying the Evaluation Board .4 General Description . 1 Measurement Setup.5 Functional Block Diagram . 1 Typical Performance Characteristics .6 Revision History . 2 Ordering Information.7 Using the Evaluation Board. 3 Bill of Materials.7 Powering Up the Evaluation Board. 3 Ordering Guide .9 Measuring Evaluation Board Performance . 3 ESD Caution.9 REVISION HISTORY 1/07-Revision 0: Initial Version Rev. 0 | Page 2 of 12 EVAL-ADP2106 EVAL-ADP2106 USING THE EVALUATION BOARD POWERING UP THE EVALUATION BOARD Turning On the Evaluation Board The ADP2106 ADP2106 evaluation board is supplied fully assembled and tested. Before applying power to the evaluation board, follow the procedures outlined in this section. Once the power source and load are connected to the ADP2106 ADP2106 evaluation board, it can be powered for operation. Slowly increase the input power source voltage until the input voltage exceeds the minimum input operating voltage of 2.7 V. Insert Jumper J1 and check to see if the output voltage rises to the regulated output voltage (1.8 V for the ADP2106-1 ADP2106-1.8-EVAL and 2.5 V for the ADP2106-EVAL ADP2106-EVAL). If the load is not already enabled, enable the load, and check that it is drawing the proper current and that the output voltage maintains voltage regulation. Jumper J1 Before turning on the ADP2106 ADP2106 evaluation board, make sure that all the components are present, but that Jumper J1 is removed. Input Power Source Before connecting the power source to the ADP2106 ADP2106 evaluation board, make sure that it is turned off. If the input power source includes a current meter, use that meter to monitor the input current. Connect the positive terminal of the power source to the VIN terminal on the evaluation board, and the negative terminal of the power source to the GND terminal of the evaluation board. If the power source does not include a current meter, connect a current meter in series with the input source voltage. Connect the positive lead (+) of the power source to the ammeter positive (+) connection, the negative lead (-) of the power source to the GND terminal on the evaluation board, and the negative lead (-) of the ammeter to the VIN terminal on the board. MEASURING EVALUATION BOARD PERFORMANCE Measuring Output Voltage Ripple To observe the output voltage ripple, place an oscilloscope probe across the output capacitor (C3/C4) with the probe ground lead at the negative (-) capacitor terminal and the probe tip at the positive (+) capacitor terminal. Set the oscilloscope to ac, 20 mV/division, and 2 s/division time base. In the PWM mode of operation, the output voltage ripple must be small (