Evaluation Board User Guide UG-186 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 User Guide for ADP322/ADP323 Evaluation Board FEATURES GENERAL DESCRIPTION Bias voltage range (VBIAS): 2.5 V to 5.5 V LDO input voltage range (VIN1/VIN2, VIN3): 1.8 V to 5.5 V Output current range: 0 mA to 200 mA per output Output voltage accuracy: ±1% Operating temperature range: −40°C to +125°C The ADP322/ADP323 evaluation board is used to demonstrate the functionality of the ADP322/ADP323 series of linear regulators. Simple device measurements, such as line and load regulation, dropout voltage, and ground current, can be demonstrated with two voltage supplies, a few voltmeters, current meters, and load resistors. For more details about the ADP322/ADP323 linear regulators, see the ADP322/ADP323 data sheet. 09299-001 EVALUATION BOARD Figure 1. ADP322/ADP323 Evaluation Board PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 12 UG-186 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Dropout Voltage Measurements..................................................5 General Description ......................................................................... 1 Ground and Bias Current Measurements ......................................6 Evaluation Board .............................................................................. 1 Ground Current Measurement....................................................6 Revision History ............................................................................... 2 Bias Current Measurement ..........................................................7 Evaluation Board Hardware and Schematic ................................. 3 Printed Circuit Board Layout Considerations...............................8 Output Voltage Measurements ....................................................... 4 Ordering Information.......................................................................9 Line Regulation Measurements .................................................. 4 Bill of Materials..............................................................................9 Load Regulation Measurements................................................. 5 Related Links......................................................................................9 REVISION HISTORY 10/10—Revision 0: Initial Version Rev. 0 | Page 2 of 12 Evaluation Board User Guide UG-186 EVALUATION BOARD HARDWARE AND SCHEMATIC 1 TP1 TB1 U1 VIN ADP322/ADP323 C1 1µF 2 VOUT1 VBIAS VOUT1 5 1 R1 1 3 TP5 1 VIN1/VIN2 FB1/NC 4 VOUT2 6 1 RES 2 C4 1µF VOUT2 TP6 1 TP9 R3 TB2 VIN3 10 FB2/NC 7 VOUT3 8 FB3/NC 9 1 RES 2 C5 1µF 2 C6 1µF VIN3 C2 1µF TB5 1 VOUT3 R5 PAD R2 2 R4 R6 RES GND 11 NC 13 1 NC 2 EN3 TP10 TB6 14 RES 15 NC 1 C3 1µF EN2 2 16 RES EN1 RES VBIAS 1 1 1 PAD TP7 TB3 12 1 TP8 TB4 JP1 1 2 3 1 2 3 EN1 1 1 HEADER_3 JP2 1 2 3 1 2 3 EN2 1 TP2 TP3 TB7 TP11 1 TP12 1 GND TP4 HEADER_3 JP3 1 2 3 EN3 09299-002 1 2 3 HEADER_3 Figure 2. ADP322/ADP323 Evaluation Board Schematic Table 1. Evaluation Board Hardware Components Component U1 1 C1, C2, C3, C4, C5, C6 JP1, JP2, JP3 R1, R2, R3, R4, R5, R6 1 Function Linear regulator Input capacitor 3-pin jumper Resistor Description ADP322/ADP323 low dropout linear regulator. 1 μF input bypass capacitor, 0402 or 0603 case. These jumpers connect EN1, EN2, and EN3 to VBIAS for automatic startup. Resistors for setting output voltage for the ADP323, 0603 size. Short R1, R3, and R5 to connect the output voltage to the feedback input for the ADP322. Component varies depending on the evaluation board type ordered. Rev. 0 | Page 3 of 12 UG-186 Evaluation Board User Guide OUTPUT VOLTAGE MEASUREMENTS VOLTAGE SOURCE VOLTMETER VOLTMETER VOLTMETER VOLTMETER 1.99711 1.99711 1.99711 1.99711 VOLTAGE SOURCE LOAD LOAD 09299-003 LOAD Figure 3. Output Voltage Measurement Setup Figure 3 shows how the evaluation board can be connected to a voltage source and voltmeters 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 be used as an alternative. In addition, ensure that the voltage source can supply enough current for the expected load levels. Follow these steps to connect to a voltage source and voltmeters: 1. 2. 3. 4. 5. 6. Insert R1, R2, R3, R4, R5, and R6 to set voltages for an ADP323. If an ADP322 is used, short R1, R3, and R5 to connect the output voltages to the feedback input for each LDO. Insert Jumpers JP1, JP2, and JP3 for automatic startup. Connect the negative terminal (−) of the voltage sources to one of the GND pads on the evaluation board. Connect the positive terminal (+) of the main voltage source to the VIN and VIN3 pads of the evaluation board. Connect the positive terminal (+) of the bias voltage source to the VBIAS pad of the evaluation board. Set the bias voltage supply to a voltage from 2.5 V to 5.5 V. Connect a load between VOUT1, VOUT2, and/or VOUT3 and one of the GND pads. 7. 8. Connect the negative terminal (−) of the voltmeters to one of the GND pads. Connect the positive terminal (+) of the voltmeters to VOUT1, VOUT2, and/or VOUT3 and VIN/VIN3. The voltage sources can now be turned on. LINE REGULATION MEASUREMENTS For line regulation measurements, the regulator’s outputs are monitored while its input is varied. For good line regulation, the outputs 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 + 0.5 V (or 1.8 V, whichever is greater) and VINMAX, where VOUTNOM is the highest of the three output voltages. For example, for an ADP322/ ADP323 with a fixed 1.8 V output, VIN must be varied between 2.3 V and 5.5 V. This measurement can be repeated under different load conditions. Figure 4 shows the typical line regulation performance of the ADP322/ADP323 with a fixed 1.8 V output. Rev. 0 | Page 4 of 12 Evaluation Board User Guide UG-186 1.820 Dropout voltage can be measured using the configuration shown in Figure 3. Dropout voltage is defined as the input-tooutput voltage differential when the input voltage is set to the nominal output voltage. This applies only to output voltages above 1.8 V. Dropout voltage increases with larger loads. 1.810 For more accurate measurements, an additional 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 6 shows the typical curve of the dropout voltage measurement with different load currents. 1.800 2.1 2.5 2.9 3.3 3.7 4.1 4.5 4.9 5.3 VIN (V) 09299-008 1.805 100 90 Figure 4. Output Voltage vs. Input Voltage For load regulation measurements, the regulator’s outputs are monitored while the loads are varied. For good load regulation, the outputs must change as little as possible with varying load. The input voltage must be held constant during this measurement. The load currents can be varied from 0 mA to 200 mA per output. Figure 5 shows the typical load regulation performance of a single 1.8 V output of the ADP322/ADP323 for an input voltage of 2.3 V to 5.5 V. DROPOUT VOLTAGE (mV) 80 LOAD REGULATION MEASUREMENTS 70 60 50 40 30 20 10 0 1.820 1 10 100 ILOAD (mA) Figure 6. Dropout Voltage vs. Load Current, VOUT = 3.3 V 1.810 1.805 1.800 1 10 100 ILOAD (mA) 1000 09299-007 VOUT (V) 1.815 Figure 5. Output Voltage vs. Load Current Rev. 0 | Page 5 of 12 1000 09299-022 VOUT (V) 1.815 DROPOUT VOLTAGE MEASUREMENTS LOAD = 1mA LOAD = 5mA LOAD = 10mA LOAD = 50mA LOAD = 100mA LOAD = 200mA UG-186 Evaluation Board User Guide GROUND AND BIAS CURRENT MEASUREMENTS VOLTAGE SOURCE VOLTMETER VOLTMETER VOLTMETER 1.99711 1.99711 1.99711 AMMETE R VOLTAGE SOURCE LOAD LOAD LOAD AMMETER 09299-107 0.00112 Figure 7. Ground and Bias Current Measurements Setup Figure 7 shows how the evaluation board can be connected to a voltage source and ammeters for ground and bias current 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 be used as an alternative. Ensure that the voltage source can supply enough current for the expected load levels. 6. Use the following steps to connect to a voltage source and ammeters: The voltage sources can now be turned on. 1. 2. 3. 4. 5. Insert R1, R2, R3, R4, R5, and R6 to set voltages for an ADP323. If an ADP322 is used, short R1, R3, and R5 to connect the output voltages to the feedback input for each LDO. Insert Jumpers JP1, JP2, and JP3 for automatic startup. Connect the positive terminal (+) of the main voltage source to the VIN and VIN3 pads of the evaluation board. Connect the negative terminal (−) of an ammeter to the VBIAS pad of the evaluation board. Connect the positive terminal (+) of the bias voltage source to the positive terminal (+) of the ammeter connected to the VBIAS pad. Set the bias voltage supply to a voltage between 2.5 V and 5.5 V. 7. 8. Connect the positive terminal (+) of the other ammeter to one of the GND pads of the evaluation board. Connect the negative terminal (−) of the ammeter connected to GND to the negative (−) terminal of the main voltage source. Connect a load between VOUT1, VOUT2, and/or VOUT3 and the negative (−) terminal of the main voltage source. GROUND CURRENT MEASUREMENT 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 per output). Figure 8 shows the typical ground current consumption for various load levels as a function of the input voltage for all three outputs set to 1.2 V and loaded equally. The ground current for the ADP323 also includes the current through the output voltage setting dividers, R1 and R2, R3 and R4, and R5 and R6. Rev. 0 | Page 6 of 12 Evaluation Board User Guide UG-186 When the device is disabled (EN1, EN2, and EN3 = GND), ground current drops to less than 1 μA. perform the regulation function. The bias current typically does not vary much with the load current or input voltage. Figure 8 shows the typical bias current consumption for various load levels at a bias voltage of 4 V for all three outputs loaded equally. 300 100 250 80 BIAS CURRENT (µA) 200 150 100 0 1.7 2.1 2.5 2.9 70 60 50 40 30 20 3.3 3.7 4.1 4.5 4.9 VIN (V) 5.3 10 0 1 Figure 8. Ground Current vs. Input Voltage, All Outputs Loaded Equally, ADP322 10 100 ILOAD (mA) 1000 09299-019 50 LOAD = 1mA LOAD = 5mA LOAD = 10mA LOAD = 50mA LOAD = 100mA LOAD = 200mA 09299-017 GROUND CURRENT (µA) 90 Figure 9. Bias Current vs. Load Current, All Outputs Loaded Equally, ADP322 BIAS CURRENT MEASUREMENT Bias current measurements can determine how much current the regulator’s internal bias circuits consume while the circuits Rev. 0 | Page 7 of 12 UG-186 Evaluation Board User Guide PRINTED CIRCUIT BOARD LAYOUT CONSIDERATIONS Heat dissipation from the package can be improved by increasing the amount of copper attached to the pins of the ADP322/ADP323. 09299-011 Place the input capacitor as close as possible to the VIN (VIN1/ VIN2), VIN3, VBIAS, and GND pins. Place the output capacitors as close as possible to the VOUT1, VOUT2, VOUT3, and GND pins. Use 0402 or 0603 size capacitors and resistors to achieve the smallest possible footprint solution on boards where space is limited. 09299-010 Figure 11. Typical Board Layout, Bottom Side Figure 10. Typical Board Layout, Top Side Rev. 0 | Page 8 of 12 Evaluation Board User Guide UG-186 ORDERING INFORMATION BILL OF MATERIALS Table 2. Qty 6 3 6 1 Reference Designator C1, C2, C3, C4, C5, C6 JP1, JP2, JP3 R1, R2, R3, R4, R5, R6 U1 Description Capacitor, MLCC, 1.0 μF, 10 V, 0402, X5R Header, single, STR, 3 pins Resistor, 1%, 0603 case IC, LDO regulator Manufacturer/Vendor Murata or equivalent Sullins Connector Solutions Vishay Analog Devices, Inc. Vendor Part No. GRM155R61A105KE15 PEC03SAAN CRCW0603xxxxF ADP322/ADP323 RELATED LINKS Resource ADP322 ADP323 Description Product Page, ADP322 Fixed Output, Triple, 200 mA, Low Noise, High PSRR Voltage Regulator Product Page, ADP323 Adjustable Output, Triple, 200 mA, Low Noise, High PSRR Voltage Regulator Rev. 0 | Page 9 of 12 UG-186 Evaluation Board User Guide NOTES Rev. 0 | Page 10 of 12 Evaluation Board User Guide UG-186 NOTES Rev. 0 | Page 11 of 12 UG-186 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. Legal Terms and Conditions By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. 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