Evaluation Board for the ADP1710/ADP1711 EVAL-ADP1710/ADP1711 FEATURES GENERAL DESCRIPTION Input voltage range: 2.5 V to 5.5 V Output current range: 0 mA to 150 mA Output voltage accuracy: ±1% Operating temperature range: −40°C to +125°C The ADP1710/ADP1711 evaluation boards can be used to demonstrate the functionality of the ADP1710 and ADP1711 series of linear regulators. Depending on what component combinations are used, the evaluation board can be used for ADP1710 fixed output voltage devices, ADP1710 adjustable output voltage devices, and ADP1711 fixed output voltage devices with a bypass capacitor. Simple device measurements such as line and load regulation, dropout, and ground current can be demonstrated with just a single voltage supply, a voltage meter, a current meter, and load resistors. For more details about the ADP1710 and ADP1711 linear regulators, visit www.analog.com. EVALUATION BOARD EVAL-ADP1710/ADP1711 GND GND C1 C2 U1 C3 R1 GND J1 R2 EN NC/ADJ/BYP NC = NO CONNECT VOUT GND 06311-001 VIN 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-ADP1710/ADP1711 TABLE OF CONTENTS Features .............................................................................................. 1 Load Regulation ............................................................................6 General Description ......................................................................... 1 Dropout Voltage ............................................................................6 Evaluation Board .............................................................................. 1 Ground Current Measurements ......................................................7 Revision History ............................................................................... 2 Ground Current Consumption ...................................................7 Evaluation Board Hardware and Schematic ................................. 3 Ordering Information.......................................................................8 Evaluation Board Configurations................................................... 4 Bill of Materials..............................................................................8 ADP1710 Adjustable Output ...................................................... 4 Ordering Guide .............................................................................8 ADP1711 Fixed Output with Bypass Capacitor ....................... 4 ESD Caution...................................................................................8 Output Voltage Measurements ....................................................... 5 Line Regulation............................................................................. 5 REVISION HISTORY 3/07—Revision 0: Initial Version Rev. 0 | Page 2 of 8 EVAL-ADP1710/ADP1711 EVALUATION BOARD HARDWARE AND SCHEMATIC GND GND C1 C2 U1 1 IN 2 GND 3 EN OUT 5 VOUT VIN NC/ ADJ/ BYP 4 NC = NO CONNECT R1 J1 C3 R2 GND EN NC/ADJ/BYP 06311-002 GND Figure 2. Evaluation Board Schematic Table 1. Evaluation Board Hardware Components Component U11 C1 C2 C32 R1, R23 J1 Function Linear regulator Input capacitor Output capacitor Bypass capacitor Output voltage adjust resistors Jumper Description ADP1710/ADP1711 Low Dropout Linear Regulator. 1 μF Input Bypass Capacitor. 1 μF Output Capacitor. Required for stability and transient performance. 10 nF Bypass Capacitor. External Resistors. Used to set VOUT with the adjustable version of ADP1710. Jumper. Connects EN to VIN for automatic startup. 1 Component varies depending on which evaluation board type is ordered. Component present only on boards with ADP1711 fixed output devices. 3 Components present only on boards with ADP1710 adjustable output devices. 2 Rev. 0 | Page 3 of 8 EVAL-ADP1710/ADP1711 EVALUATION BOARD CONFIGURATIONS ADP1710 ADJUSTABLE OUTPUT Evaluation boards that come supplied with ADP1710 adjustable output voltage option devices have the additional R1 and R2 resistors included. Figure 3 shows the schematic of this evaluation board configuration. ADP1711 FIXED OUTPUT WITH BYPASS CAPACITOR Evaluation boards that come supplied with ADP1711 fixed output voltage option devices with a bypass capacitor have C3 populated. Figure 4 shows the schematic of this evaluation board configuration. ADP1711 VIN VOUT 1 IN 2 GND 3 EN OUT 5 ADP1710 ADJUSTABLE VIN C1 VOUT 1 IN 2 GND OUT 5 J1 C2 BYP C2 C1 J1 C3 U1 R1 EN ADJ Figure 4. ADP1711 Fixed Output with Bypass Capacitor 4 R2 U1 06311-004 3 4 Figure 3. ADP1710 Adjustable Output The output voltage is set based on the following equation: VOUT = 0.8 V (1 + R1/R2) For example, if R1 = 10 kΩ and R2 = 4.99 kΩ, then VOUT is 2.403 V. Rev. 0 | Page 4 of 8 06311-005 The ADP1710/ADP1711 evaluation boards come supplied with different components depending on which version is ordered. Components common to all versions are C1, C2, and J1. EVAL-ADP1710/ADP1711 OUTPUT VOLTAGE MEASUREMENTS VOLTMETER VOLTAGE SOURCE + V EVAL-ADP1710/ADP1711 _ _ GND GND C1 + C2 U1 C3 R1 VIN J1 R2 VOUT LOAD EN NC/ADJ/BYP GND 06311-006 GND NC = NO CONNECT Figure 5. 1. 2. 3. 4. 5. Connect the negative terminal (−) of the voltage source to one of the GND pads on the evaluation board. Connect the positive terminal (+) of the voltage source to the VIN pad of the evaluation board. Connect a load between the VOUT pad and one of the GND pads. Connect the negative terminal (−) of the voltage meter to one of the GND pads, and the positive terminal (+) of the voltage meter to the VOUT pad. The voltage source can now be turned on. If J1 is inserted (this connects EN to VIN for automatic startup), then the regulator powers up. For line regulation measurements, the regulator’s output is monitored while its input is varied. For good line regulation, the output must change as little as possible with varying input levels. To ensure the device is not in dropout during this measurement, VIN must be varied between VOUTNOM + 0.5 V (or 2.5 V, whichever is greater) to VINMAX. For an ADP1710 with 3.3 V output, this means VIN needs to be varied between 3.8 V and 5.5 V. This measurement can be repeated under different load conditions. Figure 6 shows the typical line regulation performance of an ADP1710 with 3.3 V output. If large load currents are used, then the user must connect the voltage meter as close as possible to the output capacitor to reduce the effects of IR drops. 3.32 3.31 ILOAD = 100µA ILOAD = 1mA ILOAD = 10mA 3.30 3.29 3.28 ILOAD = 50mA ILOAD = 100mA ILOAD = 150mA 3.27 3.26 3.3 06311-007 Follow these steps to connect to a voltage source and voltage meter: LINE REGULATION VOUT (V) Figure 5 shows how the evaluation board can be connected to a voltage source and a voltage meter for some basic output voltage accuracy measurements. A resistor can be used as the load for the regulator. Ensure the resistor has a power rating adequate to handle the power expected to be dissipated across it. An electronic load can be used as an alternative. Ensure the voltage source used can supply adequate current for the expected load levels. 3.8 4.3 4.8 VIN (V) Figure 6. ADP1710 Line Regulation Rev. 0 | Page 5 of 8 5.3 EVAL-ADP1710/ADP1711 LOAD REGULATION DROPOUT VOLTAGE For load regulation measurements, the regulator’s output is monitored while the load is varied. For good load regulation, the output must change as little as possible with varying load levels. The input voltage must be held constant during this measurement. The load current can be varied from 0 mA to 150 mA. Figure 7 shows the typical load regulation performance of an ADP1710 with 3.3 V output for an input voltage of 3.8 V. Dropout voltage measurements can also be performed using the configuration shown in Figure 5. Dropout voltage is defined as the input-to-output voltage differential when the input voltage is set to the nominal output voltage. This applies only for output voltages above 2.5 V. Dropout voltage increases with larger loads. For more accurate measurements, a second voltage meter can be used to monitor the input voltage across the input capacitor. The input supply voltage may need to be adjusted to account for IR drops, especially if large load currents are used. Figure 8 shows a typical curve of dropout voltage measurements with different load currents. 3.32 3.31 180 160 3.29 140 VDROPOUT (mV) 3.28 3.27 1 10 100 1000 120 100 80 60 40 ILOAD (mA) Figure 7. ADP1710 Load Regulation 20 0 0.1 06311-009 3.26 0.1 06311-008 VOUT (V) 3.30 1 10 100 ILOAD (mA) Figure 8. Dropout Voltage vs. Load Current Rev. 0 | Page 6 of 8 1000 EVAL-ADP1710/ADP1711 GROUND CURRENT MEASUREMENTS VOLTAGE SOURCE + AMMETER _ _ μA + LOAD EVAL-ADP1710/ADP1711 GND C1 GND C2 U1 C3 GND R1 J1 R2 VOUT EN NC/ADJ/BYP 06311-010 VIN GND NC = NO CONNECT Figure 9. largest load level (150 mA). Figure 10 shows the typical ground current consumption for various load levels. 1100 1000 900 800 700 IGND (µA) Follow these steps to connect to a voltage source and current meter: 1. 2. 3. 4. 5. Connect the positive terminal (+) of the voltage source to the VIN pad on the evaluation board. Connect the positive terminal (+) of the current meter to one of the GND pads of the evaluation board. Connect the negative terminal (−) of the current meter to the negative (−) terminal of the voltage source. Connect a load between the VOUT pad of the evaluation board and the negative (−) terminal of the voltage source. The voltage source can now be turned on. If J1 is inserted (this connects EN to VIN for automatic startup), then the regulator powers up. GROUND CURRENT CONSUMPTION Ground current measurements are a way of determining how much current the regulator’s internal circuits are consuming, while performing the regulation function. To be efficient, the regulator must consume as little current as possible. Typically, the regulator consumes maximum current when supplying its 600 500 400 300 200 06311-011 Figure 9 shows how the evaluation board can be connected to a voltage source and a current meter for ground current measurements. A resistor can be used as the load for the regulator. Ensure the resistor has a power rating adequate to handle the power expected to be dissipated across it. An electronic load can be used as an alternative. Ensure the voltage source used can supply adequate current for the expected load levels. 100 0 0.1 1 10 100 1000 ILOAD (mA) Figure 10. Ground Current vs. Load Current. When the device is disabled (EN = 0 V), ground current is reduced to less than 1 μA. Note: Larger ground current levels are observed when using an evaluation board with R1 and R2 present. Rev. 0 | Page 7 of 8 EVAL-ADP1710/ADP1711 ORDERING INFORMATION BILL OF MATERIALS Table 2. Qty 2 1 1 1 1 1 Reference Designator C1, C2 C3 R1 R2 J1 U1 Description Capacitor, MLCC, 1 μF, 16 V, 0805, X7R Capacitor, MLCC, 10 nF, 100 V, 0805, X7R Resistor, 10 kΩ, 1%, 0805 Resistor, 4.99 kΩ, 1%, 0805 Header, single, STR, 2 pins ADP1710/ADP1711 IC, LDO Regulator ORDERING GUIDE Model ADP1710-EVALZ1 ADP1711-2.5-EVALZ1 1 Manufacturer/Vendor Murata or equivalent Murata or equivalent Vishay Dale or equivalent Vishay Dale or equivalent Digi-Key, Corp. Analog Devices, Inc. ESD CAUTION Description Evaluation Board with Adjustable Output ADP1710 Evaluation Board with 2.5 V Fixed Output ADP1711 Z = RoHS Compliant Part. ©2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. EB06311-0-3/07(0) Rev. 0 | Page 8 of 8 Vendor Part No. GRM21BR71C105KA01 GRM21BR72A103KA01 CRCW080510K0FKEA CRCW08054K990FKEA S1012E-36-ND ADP1710AUJZ-R7 ADP1711AUJZ-2.5-R7