Evaluation Board User Guide UG-054 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 Setting Up the Evaluation Board for the ADP150 Simple device measurements such as line and load regulation, dropout voltage, and ground current can be demonstrated with only a single voltage supply, a voltage meter, a current meter, and load resistors. FEATURES Input voltage range: 2.2 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 For more information about the ADP150 linear regulator, see the ADP150 data sheet. GENERAL DESCRIPTION The ADP150 evaluation board is used to demonstrate the functionality of the ADP150 linear regulator. 08518-002 08518-001 EVALUATION BOARDS Figure 1. TSOT PCB Layout Please see the last page for an important warning and disclaimers. Figure 2. WLCSP PCB Layout Rev. 0 | Page 1 of 8 UG-054 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Load Regulation Measurements ..................................................5 General Description ......................................................................... 1 Dropout Voltage Measurements..................................................5 Evaluation Boards ............................................................................. 1 Ground Current Measurements ......................................................6 Revision History ............................................................................... 2 Ground Current Consumption ...................................................7 Evaluation Board Hardware ............................................................ 3 Ordering Information .......................................................................8 Evaluation Board Configurations .............................................. 3 Bill of Materials ..............................................................................8 Output Voltage Measurements ....................................................... 4 ESD Caution...................................................................................8 Line Regulation Measurements .................................................. 5 REVISION HISTORY 1/10—Revision 0: Initial Version Rev. 0 | Page 2 of 8 Evaluation Board User Guide UG-054 EVALUATION BOARD HARDWARE EVALUATION BOARD CONFIGURATIONS Table 1. Evaluation Board Hardware Components The ADP150 evaluation board is supplied with different components, depending on the version that is ordered. Components common to both versions are C2, C4, and J1. Figure 3 and Figure 4 show the schematics of these evaluation board configurations. Table 1 describes the components. Component U1 1 C1 2 VOUT VIN VIN 2 GND 3 EN C1 VOUT 5 C3 U1 J1 C4 08518-003 C2 1 NC 4 Figure 3. Evaluation Board Schematic, TSOT VIN C2 C32 C4 J1 1 The evaluation board with the WLCSP package is the ADP150CB-3.3-EVALZ. The evaluation board with the TSOT package is the ADP150UJ-3.3-EVALZ. 2 C1 and C3 are not populated. The ADP150 evaluation board requires only one input bypass capacitor and one output capacitor for stable operation. VOUT VIN C1 VOUT C3 J1 C4 U1 EN GND 08518-004 C2 Description ADP150 low dropout linear regulator Input bypass capacitor, 1 μF, 0402 size (not populated) Input bypass capacitor, 1 μF, 0603 size Output capacitor, 1 μF, 0402 size (not populated) Output capacitor, 1 μF, 0603 size Jumper (connects EN to VIN for automatic startup) Figure 4. Evaluation Board Schematic, WLCSP Rev. 0 | Page 3 of 8 UG-054 Evaluation Board User Guide OUTPUT VOLTAGE MEASUREMENTS VOLTMETER VOLTAGE SOURCE 08518-005 LOAD Figure 5. Output Voltage Measurement Setup, TSOT VOLTAGE SOURCE VOLTMETER 08518-006 LOAD Figure 6. Output Voltage Measurement Setup, WLCSP Figure 5 and Figure 6 show how the evaluation board can be connected to a voltage source and a voltage meter 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 that is adequate to handle the power that is 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. Follow these steps to connect to a voltage source and voltage meter: 1. 2. 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. 3. 4. 5. 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. Connect the positive terminal (+) of the voltage meter to the VOUT pad. When these steps are completed, the voltage source can be turned on. If J1 is inserted (connecting EN to VIN for automatic startup), the regulator powers up. If the load current is large, the user must connect the voltage meter as close as possible to the output capacitor to reduce the effects of IR drops. Rev. 0 | Page 4 of 8 Evaluation Board User Guide UG-054 LINE REGULATION MEASUREMENTS DROPOUT VOLTAGE MEASUREMENTS For line regulation measurements, the output of the regulator 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 VOUTNOM + 0.4 V (or 2.2 V, whichever is greater) and VINMAX. Dropout voltage can be measured using the configurations 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 to output voltages above 2.2 V. Dropout voltage increases with larger loads. For example, for an ADP150 with a fixed 3.3 V output, VIN must be varied between 3.7 V and 5.5 V. This measurement can be repeated under different load conditions. Figure 7 shows the typical line regulation performance of an ADP150 with a fixed 3.3 V output. 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 9 shows the typical curve of dropout voltage measurements with different load currents. 3.300 80 IOUT = 0.1mA 3.298 70 DROPOUT VOLTAGE (mV) IOUT = 1mA 3.296 VOUT (V) IOUT = 10mA 3.294 3.292 IOUT = 50mA 3.290 IOUT = 100mA 60 50 40 30 20 IOUT = 150mA 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 VIN (V) 0 08518-007 3.288 3.5 1 For load regulation measurements, the output of the regulator is monitored while the load is varied. For good load regulation, the output must change as little as possible with varying load. 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 an ADP150 with a fixed 3.3 V output for an input voltage of 3.7 V. 3.298 3.297 3.296 VOUT (V) 3.295 3.294 3.293 3.292 10 100 1000 IOUT (mA) 08518-013 3.291 1 1000 Figure 9. Dropout Voltage vs. Load Current (IOUT) at VOUT = 3.3 V, TA = 25°C LOAD REGULATION MEASUREMENTS 0.1 100 IOUT (mA) Figure 7. Output Voltage (VOUT) vs. Input Voltage (VIN) at TA = 25°C 3.290 0.01 10 08518-009 10 Figure 8. Output Voltage (VOUT) vs. Load Current (IOUT) at VIN = 3.7 V, VOUT = 3.3 V, TA = 25°C Rev. 0 | Page 5 of 8 UG-054 Evaluation Board User Guide GROUND CURRENT MEASUREMENTS AMMETER VOLTAGE SOURCE 08518-010 LOAD Figure 10. Ground Current Measurement Setup, TSOT VOLTAGE SOURCE 08518-011 AMMETER LOAD Figure 11. Ground Current Measurement Setup, WLCSP Figure 10 and Figure 11 show how the evaluation board can be 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 that is expected to be dissipated across it. An electronic load can be used as an alternative. Ensure that the voltage source can supply enough current for the expected load levels. Follow these steps to connect to a voltage source and ammeter: 1. 2. 3. 4. Rev. 0 | Page 6 of 8 Connect the positive terminal (+) of the voltage source to the VIN pad of the evaluation board. Connect the positive terminal (+) of the ammeter to one of the GND pads on the evaluation board. Connect the negative terminal (−) of the ammeter 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. Evaluation Board User Guide UG-054 250 When these steps are completed, the voltage source can be turned on. If J1 is inserted (connecting EN to VIN for automatic startup), the regulator powers up. IOUT = 150mA GROUND CURRENT (µA) 200 GROUND CURRENT CONSUMPTION Ground current measurements can determine how much current the internal circuits of the regulator consume while the circuits perform the regulation function. To be efficient, the regulator must consume as little current as possible. Typically, the regulator uses the maximum current when supplying its largest load level (150 mA). Figure 12 shows the typical ground current consumption for various load levels at VOUT = 3.3 V and TA = 25°C. IOUT = 100mA 150 IOUT = 50mA 100 IOUT = 10mA 50 IOUT = 1mA 3.7 3.9 4.1 4.3 4.5 4.7 VIN (V) 4.9 5.1 5.3 5.5 08518-012 IOUT = 0.1mA 0 3.5 When the device is disabled (EN = GND), ground current drops to less than 1 μA. Figure 12. Ground Current vs. Input Voltage (VIN) at VOUT = 3.3 V, TA = 25°C Rev. 0 | Page 7 of 8 UG-054 Evaluation Board User Guide ORDERING INFORMATION BILL OF MATERIALS Table 2. Reference Designator C2, C4 J1 U1 Description Capacitor, MLCC, 1 μF, 16 V, 0603, X5R Jumper, single, STR, two pins IC, LDO regulator Manufacturer Murata (or equivalent) Sullins Connector Solutions Analog Devices, Inc. Part No. GRM188R61C105KA93 PEC02SAAN ADP150ACBZ-3.3-R7 (WLCSP) ADP150AUJZ-3.3-R7 (TSOT) ESD CAUTION 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. ©2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG08518-0-1/10(0) Rev. 0 | Page 8 of 8