ADP121CB-2.8-EVALZ

Evaluation Board for the ADP121 EVAL-ADP121 FEATURES Input voltage range: 2.3 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 EVALUATION BOARD BLOCK DIAGRAMS GND GND ANALOG DEVICES ADP121-xx-EVALZ C1 GENERAL DESCRIPTION C2 U1 The ADP121 evaluation boards are used to demonstrate the functionality of the ADP121 linear regulators. Simple device measurements such as line and load regulation, dropout, and ground current can be demonstrated with just a single voltage supply, a voltmeter, a current meter, and load resistors. J1 VIN VOUT GND EN GND NOTES 1. xx = 28 (2.8V), 30 (3.0V), 33 (3.3V). 07140-001 For more details about the ADP121 linear regulators, see the ADP121 data sheet. 07140-014 Figure 1. TSOT Figure 2. WLCSP 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 ©2008–2009 Analog Devices, Inc. All rights reserved. EVAL-ADP121 TABLE OF CONTENTS Features .............................................................................................. 1 Load Regulation ............................................................................5 General Description ......................................................................... 1 Dropout Voltage ............................................................................5 Evaluation Board Block Diagrams ................................................. 1 Measuring Ground Current .............................................................6 Revision History ............................................................................... 2 Ground Current Consumption ...................................................7 Evaluation Board Hardware ............................................................ 3 Ordering Information .......................................................................8 Evaluation Board Configurations .............................................. 3 Bill of Materials ..............................................................................8 Measuring Output Voltage .............................................................. 4 Ordering Guide .............................................................................8 Line Regulation ............................................................................. 5 ESD Caution...................................................................................8 REVISION HISTORY 4/09—Rev. 0 to Rev. A Changes to Figure 2 .......................................................................... 1 Changes to Figure 5 and Figure 6 ................................................... 4 Changes to Figure 12 ........................................................................ 6 Changes to Ordering Guide ............................................................ 8 7/08—Revision 0: Initial Version Rev. A | Page 2 of 8 EVAL-ADP121 EVALUATION BOARD HARDWARE EVALUATION BOARD CONFIGURATIONS Table 1. Evaluation Board Hardware Components The EVAL-ADP121 is supplied with different components depending on which version is ordered. Components common to all versions are C1, C2, and J1 or J2. Figure 3 and Figure 4 show schematics for these evaluation board configurations. Component U1 1 VIN VOUT VIN C1 C2 U1 J1 2 GND 3 EN C2 VOUT 5 J1 or J2 07140-002 1 C1 NC 4 Figure 3. Evaluation Board Circuit Diagram, TSOT VIN 1 VOUT C2 J2 U1 EN GND 07140-010 C1 Description ADP121 low dropout linear regulator. 1 μF input bypass capacitor. 1 μF output capacitor. Required for stability and transient performance. Jumper. Connects EN to IN for automatic startup. This component varies depending on the evaluation board type ordered. VOUT VIN Function Linear regulator Input capacitor Output capacitor Jumper Figure 4. Evaluation Board Circuit Diagram, WLCSP Rev. A | Page 3 of 8 EVAL-ADP121 MEASURING OUTPUT VOLTAGE VOLTAGE SOURCE + GND GND VOLTMETER ANALOG DEVICES ADP121-xx-EVALZ + – C1 – C2 U1 J1 LOAD VOUT GND EN 07140-003 VIN GND Figure 5. Output Voltage Measurement, TSOT VOLTAGE SOURCE – VOLTMETER + + – 07140-015 LOAD Figure 6. Output Voltage Measurement, WLCSP Figure 5 and Figure 6 show how the evaluation board can be connected to a voltage source and a voltmeter for basic output voltage accuracy measurements. A resistor can be used as the load for the regulator. Ensure that the resistor has a power rating adequate to handle the power expected to be dissipated across it. An electronic load can also be used as an alternative. Ensure that the voltage source can supply enough current for the expected load levels. 2. 3. 5. Connect the negative terminal (−) of the voltmeter to one of the GND pads. Connect the positive terminal (+) of the voltmeter to the VOUT pad. The voltage source can now be turned on. If J1 or J2 is inserted (connecting EN to VIN for automatic startup), the regulator powers up. If the load current is large, the user needs to connect the voltmeter as close as possible to the output capacitor to reduce the effects of IR drops. Use the following steps to connect to a voltage source and voltmeter: 1. 4. 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. Rev. A | Page 4 of 8 EVAL-ADP121 LINE REGULATION DROPOUT VOLTAGE 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 that the device is not in dropout mode during this measurement, VIN must be varied between VOUT nominal + 0.5 V (or 2.3 V, whichever is greater) and VIN maximum. For example, an ADP121 with a fixed 1.8 V output needs VIN to be varied between 2.3 V and 5.5 V. This measurement can be repeated under different load conditions. Figure 7 shows the typical line regulation performance of the ADP121 with fixed 1.8 V output. Dropout voltage can be measured using the configuration shown in Figure 5 and Figure 6. 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 2.3 V. Dropout voltage increases with larger loads. For more accurate measurements, a second voltmeter 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 9 and Figure 10 show the typical curves of dropout voltage measurements with different load currents for different output voltages. 180 TA = 25°C 1.806 1.802 160 140 VDROPOUT (mV) 1.804 VOUT (V) VOUT = 1.8V TA = 25°C LOAD = 10µA LOAD = 100µA LOAD = 1mA LOAD = 10mA LOAD = 50mA LOAD = 100mA 1.800 120 100 80 VOUT = 2.5V 60 VOUT = 3.3V 1.798 40 1.796 0 3.1 3.5 3.9 VIN (V) 4.3 4.7 5.1 5.5 1 140 1.806 VOUT = 1.8V VIN = 2.3V TA = 25°C TA = 25°C 120 100 VDROPOUT (mV) 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 loads. The input voltage must be held constant during this measurement. The load current can be varied from 0 mA to 150 mA. Figure 8 shows the typical load regulation performance of the ADP121 with fixed 1.8 V output for an input voltage of 2.3 V. 80 60 VOUT = 2.5V 40 VOUT = 3.3V 20 1.802 0 1 10 100 ILOAD (mA) 1.800 Figure 10. WLCSP Dropout Voltage vs. Load Current 1.798 0.1 1 10 ILOAD (mA) 100 1000 07140-005 1.796 1.794 0.01 1000 Figure 9. TSOT Dropout Voltage vs. Load Current LOAD REGULATION VOUT (V) 100 ILOAD (mA) Figure 7. Output Voltage vs. Input Voltage 1.804 10 Figure 8. Output Voltage vs. Load Current Rev. A | Page 5 of 8 1000 07140-013 2.7 07140-004 1.794 2.3 07140-006 20 EVAL-ADP121 MEASURING GROUND CURRENT AMMETER VOLTAGE SOURCE + – – + GND GND ANALOG DEVICES ADP121-xx-EVALZ LOAD C1 C2 U1 J1 VOUT GND EN GND 07140-007 VIN Figure 11. Ground Current Measurement, TSOT VOLTAGE SOURCE – + AMMETER + 07140-016 – LOAD Figure 12. Ground Current Measurement, WLCSP Figure 11 and Figure 12 show the evaluation board connected to a voltage source and an ammeter for ground current measurements. A resistor can be used as the load for the regulator. Ensure that the resistor has a power rating that is adequate to handle the power expected to be dissipated across it. An electronic load can be used as an alternative. Ensure that the voltage source used can supply enough current for the expected load levels. Use the following steps to connect to a voltage source and ammeter: 1. 2. 3. 4. Connect the positive terminal (+) of the ammeter to one of the GND pads of the evaluation board. Connect the negative terminal (−) of the ammeter to the negative (−) terminal of the voltage source. Connect a load between the negative (−) terminal of the voltage source and the VOUT pad of the evaluation board. The voltage source can now be turned on. If J1 or J2 is inserted (connecting EN to VIN for automatic startup), the regulator powers up. Connect the positive terminal (+) of the voltage source to the VIN pad on the evaluation board. Rev. A | Page 6 of 8 EVAL-ADP121 35 Ground current measurements can determine how much current the regulator’s internal circuits consume while the circuits perform the regulation function. To be efficient, the regulator needs to consume as little current as possible. Typically, the regulator uses the maximum current when supplying its largest load level (150 mA). Figure 13 shows the typical ground current consumption for various load levels at an input voltage of 2.3 V. 30 VOUT = 1.8V VIN = 2.3V TA = 25°C 25 20 15 10 5 0 0.01 0.1 1 10 ILOAD (mA) 100 Figure 13. Ground Current vs. Load Current Rev. A | Page 7 of 8 1000 07140-008 When the device is disabled (EN = GND), the ground current drops to less than 1 μA. GROUND CURRENT (µA) GROUND CURRENT CONSUMPTION EVAL-ADP121 ORDERING INFORMATION BILL OF MATERIALS Table 2. Qty 2 1 1 Reference Designator C1, C2 J1 or J2 U1 Description Capacitor, MLCC, 1 μF, 10 V, 0402, X5R Header, single, STR, 2 pins IC, LDO regulator Manufacturer/Vendor Murata or equivalent Digi-Key Corp. Analog Devices, Inc. Vendor Part No. GRM155R61A105KE15 S1012E-36-ND ADP121-AUJZ33R7 ADP121-AUJZ30R7 ADP121-AUJZ28R7 ADP121-ACBZ33R7 ADP121-ACBZ30R7 ADP121-ACBZ28R7 ADP121-ACBZ20R7 ADP121-ACBZ18R7 ORDERING GUIDE Model ADP121-3.3-EVALZ1 ADP121-3.0-EVALZ1 ADP121-2.8-EVALZ1 ADP121-1.8-EVALZ1 ADP121-1.5-EVALZ1 ADP121-1.2-EVALZ1 ADP121CB-3.3-EVALZ1 ADP121CB-3.0-EVALZ1 ADP121CB-2.8-EVALZ1 ADP121CB-2.0-EVALZ1 ADP121CB-1.8-EVALZ1 ADP121CB-1.5-EVALZ1 ADP121CB-1.2-EVALZ1 ADP121-BL1-EVZ1 1 Output Voltage 3.3 3.0 2.8 1.8 1.5 1.2 3.3 3.0 2.8 2.0 1.8 1.5 1.2 Description ADP121 3.3 V Output Evaluation Board [TSOT] ADP121 3.0 V Output Evaluation Board [TSOT] ADP121 2.8 V Output Evaluation Board [TSOT] ADP121 1.8 V Output Evaluation Board [TSOT] ADP121 1.5 V Output Evaluation Board [TSOT] ADP121 1.2 V Output Evaluation Board [TSOT] ADP121-1 3.3 V Output Evaluation Board [WLCSP] ADP121-1 3.0 V Output Evaluation Board [WLCSP] ADP121-1 2.8 V Output Evaluation Board [WLCSP] ADP121-1 2.0 V Output Evaluation Board [WLCSP] ADP121-1 1.8 V Output Evaluation Board [WLCSP] ADP121 1.5 V Output Evaluation Board [WLCSP] ADP121 1.2 V Output Evaluation Board [WLCSP] Blank Evaluation Board Z = RoHS Compliant Part. ESD CAUTION ©2008–2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. EB07140-0-4/09(A) Rev. A | Page 8 of 8