Evaluation Board User Guide UG-116 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 ADP151 FEATURES Input voltage range: 2.2 V to 5.5 V Output current range: 0 mA to 200 mA Output voltage accuracy: ±1% Operating temperature range: −40°C to +125°C GENERAL DESCRIPTION The ADP151 evaluation board is used to demonstrate the functionality of the ADP151 series of linear regulators. Simple device measurements such as line and load regulation, dropout voltage, and ground current can be demonstrated with only a single voltage supply, a voltmeter, a current meter, and load resistors. 08933-002 For more information about the ADP151 linear regulator, see the ADP151 data sheet. EVALUATION BOARDS 08933-001 08933-013 Figure 2. WLCSP PCB Layout Figure 1. TSOT PCB Layout PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Figure 3. LFCSP PCB Layout Rev. A | Page 1 of 12 UG-116 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Measuring Output Voltage ...............................................................4 General Description ......................................................................... 1 Line Regulation Measurements...................................................5 Evaluation Boards............................................................................. 1 Load Regulation Measurements..................................................5 Revision History ............................................................................... 2 Dropout Voltage Measurements..................................................6 Revision History ............................................................................... 2 Measuring Ground Current .............................................................7 Evaluation Board Hardware ............................................................ 3 Ground Current Consumption ...................................................8 Evaluation Board Configurations .............................................. 3 Bill of Materials..................................................................................9 REVISION HISTORY 12/10—Rev. 0 to Rev. A Added LFCSP Throughout................................................Universal Added Figure 3; Renumbered Sequentially .................................. 1 Added Figure 6.................................................................................. 3 Added Figure 9.................................................................................. 5 Added Figure 15................................................................................ 8 4/10—Revision 0: Initial Version Rev. A | Page 2 of 12 Evaluation Board User Guide UG-116 EVALUATION BOARD HARDWARE EVALUATION BOARD CONFIGURATIONS VIN The ADP151 evaluation board is supplied with different components, depending on the version ordered. Components common to all versions are C1, C2, and J1. Figure 4 and Figure 5 show the schematics of these evaluation board configurations. Table 1 describes the components. C1 C1 1µF VOUT U1 2 GND 3 EN 1 U1 5 J1 4 VOUT C2 NC EN TOP VIEW (Not to Scale) NC GND 2 3 NC = NO CONNECT. DO NOT CONNECT TO THIS PIN. 5 Figure 6. Evaluation Board Schematic, LFCSP C2 1µF ADP151 VOUT ADP151 VOUT VIN 1 VIN 08933-014 VIN 6 J1 4 08933-003 NC Figure 4. Evaluation Board Schematic, TSOT 1 2 VIN VOUT U1 J1 ADP151 C2 1µF 1 EN GND Figure 5. Evaluation Board Schematic, WLCSP 08933-004 C1 1µF Component U1 1 C1 2 C22 J1 VOUT VIN Table 1. Evaluation Board Hardware Components Description ADP151 ultralow noise, low dropout linear regulator Input bypass capacitor, 1 μF, 0402 size Output capacitor, 1 μF, 0402 size Jumper (connects EN to VIN for automatic startup) The evaluation board with the WLCSP package is the ADP151CB-xxx-EVALZ. The evaluation board with the TSOT package is the. ADP151UJ-xxx-EVALZ. 2 The ADP151 evaluation board requires only one input bypass capacitor and one output capacitor for stable operation. Rev. A | Page 3 of 12 UG-116 Evaluation Board User Guide MEASURING OUTPUT VOLTAGE VOLTMETER VOLTAGE SOURCE 1.99711 + + – – 08933-005 LOAD Figure 7. Output Voltage Measurement Setup, TSOT VOLTMETER VOLTAGE SOURCE 1.99711 – + + LOAD 08933-006 – Figure 8. Output Voltage Measurement Setup, WLCSP Rev. A | Page 4 of 12 Evaluation Board User Guide UG-116 VOLTMETER 1.99711 VOLTAGE SOURCE – + – + 08933-015 LOAD Figure 9. Output Voltage Measurement Setup, LFCSP This measurement can be repeated under different load conditions. Figure 10 shows the typical line regulation performance of an ADP151 with a 2.8 V output. 2.83 2.82 Use the following steps to connect to a voltage source and voltmeter: 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 voltmeter to one of the GND pads. Connect the positive terminal (+) of the voltmeter 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 voltmeter as close as possible to the output capacitor to reduce the effects of IR drops. LOAD = 10mA LOAD = 100mA LOAD = 200mA 2.80 2.79 2.78 2.77 3.10 08933-007 1. LOAD = 10µA LOAD = 100µA LOAD = 1mA 2.81 VOUT (V) Figure 7 and Figure 8 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 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. 3.50 3.90 4.30 4.70 5.10 5.50 VIN (V) Figure 10. Output Voltage (VOUT) vs. Input Voltage (VIN) at TA = 25°C LOAD REGULATION MEASUREMENTS 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 200 mA. Figure 11 shows the typical load regulation performance of an ADP151 with a 2.8 V output for an input voltage of 3.2 V. LINE REGULATION 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 VOUT nominal + 0.4 V (or 2.2 V, whichever is greater) and VIN maximum. For example, for an ADP151 with a 2.8 V output, VIN needs to be varied between 3.2 V and 5.5 V. Rev. A | Page 5 of 12 UG-116 Evaluation Board User Guide 2.83 The input supply voltage may need to be adjusted to account for IR drops, especially if large load currents are used. Figure 12 shows the typical curve of dropout voltage measurements with different load currents. 2.82 120 2.80 100 VDROPOUT (mV) 2.79 2.77 0.01 0.1 1 10 100 1000 ILOAD (mA) 08933-008 2.78 80 60 40 20 Figure 11. Output Voltage, VOUT vs. Load Current, IOUT at VIN = 3.2 V, VOUT = 2.8 V, TA = 25°C 0 DROPOUT VOLTAGE MEASUREMENTS 1 Dropout voltage can be measured using the configurations shown in Figure 7 and Figure 8. 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 more accurate measurements, a second voltmeter can be used to monitor the input voltage across the input capacitor. Rev. A | Page 6 of 12 10 100 ILOAD (mA) Figure 12. Dropout Voltage vs. Load Currents (ILOAD) VOUT = 2.8 V, TA = 25°C 1000 08933-009 VOUT (V) 2.81 Evaluation Board User Guide UG-116 MEASURING GROUND CURRENT AMMETER VOLTAGE SOURCE 1.99711 – – + 08933-010 LOAD Figure 13. Ground Current Measurement Setup, TSOT AMMETER VOLTAGE SOURCE 0.00112 – + – + LOAD 08933-011 + Figure 14. Ground Current Measurement Setup, WLCSP Rev. A | Page 7 of 12 UG-116 Evaluation Board User Guide VOLTAGE SOURCE – + AMMETER 0.00112 + 08933-016 – LOAD Figure 15. Ground Current Measurement Setup, LFCSP 1. 2. 3. 4. Connect the positive terminal (+) of the voltage source to the VIN pad on the evaluation board. 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 VOUT pad of the evaluation board and the negative (−) terminal of the voltage source. 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 (200 mA). Figure 16 shows the typical ground current consumption for various load levels at VOUT = 2.8 V and TA = 25°C. When the device is disabled (EN = GND), ground current drops to less than 1 μA. When these connection 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. 1000 LOAD = 10µA LOAD = 100µA LOAD = 1mA LOAD = 10mA LOAD = 100mA LOAD = 200mA 100 10 3.10 3.50 3.90 4.30 4.70 5.10 5.50 VIN (V) Figure 16. Ground Current vs. Input Voltage, VOUT = 2.8 V, TA = 25°C Rev. A | Page 8 of 12 08933-012 Use the following steps to connect to a voltage source and ammeter: GROUND CURRENT CONSUMPTION GROUND CURRENT (µA) Figure 13 and Figure 14 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 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. Evaluation Board User Guide UG-116 BILL OF MATERIALS Table 2. Reference Designator C1, C2 J1 U1 Description Capacitor, MLCC, 1 μF, 10 V, 0402, X5R Header, single, STR, 2 pins IC, LDO regulator Manufacturer Murata (or equivalent) Sullins Connector Solutions Analog Devices, Inc. Rev. A | Page 9 of 12 Part No. PEC02SAAN ADP151 UG-116 Evaluation Board User Guide NOTES Rev. A | Page 10 of 12 Evaluation Board User Guide UG-116 NOTES Rev. A | Page 11 of 12 UG-116 Evaluation Board User Guide NOTES ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality. 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