ADP2311-1-EVALZ

EVAL-ADP2311 User Guide UG-653 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 Evaluation Board for the ADP2311, Dual, 1 A, 18 V Synchronous Step-Down Regulator with Fail-Safe Voltage Monitoring FEATURES GENERAL DESCRIPTION Input voltage: 4.5 V to 18 V ±1.0% output accuracy Integrated MOSFET: 110 mΩ/60 mΩ typical Continuous output current: 1 A/1 A Power fail comparator generates warning Power-on reset with programmable delay timer Adjustable voltage monitor for power-down Watchdog refresh input Dual phase with 180° out of phase operation Fixed switching frequency: 300 kHz Internal compensation and soft start Stable with low effective series resistance (ESR) output ceramic capacitors Precision enable input Power feedback during power off Undervoltage lockout (UVLO), overcurrent protection (OCP), overvoltage protection (OVP), and thermal shutdown (TSD) The ADP2311 evaluation board is a complete, dual, 1 A step-down regulator solution that allows users to evaluate the performance of the ADP2311 with a near ideal printed circuit board (PCB) layout. The outputs of the ADP2311 evaluation board are preset to 1.2 V and 3.3 V for Channel 1 and Channel 2, respectively. The VIN threshold of the power fail input is set at 8.99 V. Different output and power fail input voltages can be achieved by changing the appropriate passive components. Full details on the ADP2311 dual regulator are provided in the ADP2311 data sheet, available from Analog Devices, Inc., which should be consulted in conjunction with this user guide. 11995-001 ADP2311 EVALUATION BOARD Figure 1. PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 8 UG-653 EVAL-ADP2311 User Guide TABLE OF CONTENTS Features .............................................................................................. 1  Evaluation Board Schematic and Artwork.....................................5  General Description ......................................................................... 1  ADP2311 Evaluation Board Schematic ......................................5  ADP2311 Evaluation Board ............................................................ 1  PCB Layout ....................................................................................6  Revision History ............................................................................... 2  Ordering Information .......................................................................8  Using the Evaluation Board............................................................. 3  Bill of Materials ..............................................................................8 Powering Up the Evaluation Board ............................................ 3  Measuring Evaluation Board Performance .................................. 3  Modifying the Evaluation Board ................................................ 4  REVISION HISTORY 3/14—Revision 0: Initial Version Rev. 0 | Page 2 of 8 EVAL-ADP2311 User Guide UG-653 USING THE EVALUATION BOARD POWERING UP THE EVALUATION BOARD Turning On the Evaluation Board The ADP2311 evaluation board is supplied fully assembled and tested. Before applying power to the evaluation board, follow the procedures in this section. When the power source and load are connected to the evaluation board, it can be powered for operation. Jumper J20 Setting (Enable) 1. 2. 3. Jumper J20 is used to control the ADP2311. Use one of the following methods to enable or to disable the device: • • To enable the ADP2311, short the middle pin of J20 (EN) to high. To disable the ADP2311, short the middle pin of J20 (EN) to low. Input Power Source 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 J4 (VIN) of the evaluation board, and connect the negative terminal of the power source to J6 (GND) 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 positive (+) ammeter terminal, the negative lead (−) of the power source to J6 (GND), and the negative lead (−) of the ammeter to J4 (VIN). Output Load To turn on the evaluation board, perform the following steps: Ensure that the power source voltage is >4.5 V and