ADP1764-EVALZ/ADP1765-EVALZ User Guide UG-1072 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 Evaluating the ADP1764 and ADP1765 Low VIN, Low Noise, CMOS Linear Regulators FEATURES EVALUATION BOARD PHOTOGRAPHS Full featured evaluation boards for ADP1764 and ADP1765 Input voltage range: 1.10 V to 1.98 V Output current range: ADP1764: 0 mA to 4 A ADP1765: 0 mA to 5 A Evaluation available on adjustable or fixed output voltage Convenient test points for electrical measurements Operating temperature range: -40C to +125C ADDITIONAL EQUIPMENT NEEDED Voltage source Voltmeter Ammeter Electronic resistor load The ADP1764-1.0-EVALZ and ADP1765-1.0-EVALZ fixed evaluation boards and the ADP1764-ADJ-EVALZ and ADP1765ADJ-EVALZ adjustable evaluation boards demonstrate the functionality of the ADP1764 and the ADP1765 series of linear regulators. 15194-001 GENERAL DESCRIPTION Figure 1. The ADP1765-1.0-EVALZ Fixed Board (Identical to the ADP1764-1.0-EVALZ) Simple device measurements, such as line and load regulation, dropout voltage, and ground current, are demonstrated with only a single voltage supply, a voltmeter, an ammeter, and load resistors. Figure 1 and Figure 2 show the ADP1765 evaluation boards; the ADP1764 fixed and adjustable evaluation boards are identical to the ADP1765. 15194-002 For full details on the ADP1764 and the ADP1765 linear regulators, see the ADP1764 and the ADP1765 data sheets, which should be consulted in conjunction with this user guide when using these evaluation boards. Figure 2. The ADP1765-ADJ-EVALZ Adjustable Board (Identical to the ADP1764-ADJ-EVALZ) PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 9 UG-1072 ADP1764-EVALZ/ADP1765-EVALZ User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Load Regulation Measurements ..................................................5 General Description ......................................................................... 1 Dropout Voltage Measurements..................................................5 Evaluation Board Photographs ....................................................... 1 Ground Current Measurements ..................................................5 Revision History ............................................................................... 2 Ground Current Consumption ...................................................6 Evaluation Board Hardware ............................................................ 3 Evaluation Board Schematics and Artwork ...................................7 Evaluation Board Configurations .............................................. 3 Ordering Information .......................................................................9 Output Voltage Measurements ................................................... 4 Bill of Materials ..............................................................................9 Line Regulation Measurements .................................................. 5 REVISION HISTORY 1/2017--Revision 0: Initial Version Rev. 0 | Page 2 of 9 ADP1764-EVALZ/ADP1765-EVALZ User Guide UG-1072 EVALUATION BOARD HARDWARE EVALUATION BOARD CONFIGURATIONS Calculate the start-up time of the regulator by The ADP1764 and ADP1765 evaluation boards come supplied with different components, depending on the adjustable or fixed version ordered. Components common to all versions are C1, C2, C3, C4, C5, J1, and R2. Use R1 for the ADP1764-ADJ-EVALZ and ADP1765-ADJ-EVALZ evaluation boards. Figure 9 and Figure 10 show the schematics of these evaluation board configurations, and Table 1 describes the hardware components. The ADP1764-ADJ-EVALZ and ADP1765-ADJ-EVALZ have an output voltage range of 0.5 V to 1.5 V. The output voltage is set to 1.0 V by the external 6.8 k adjust resistor. tSTART-UP_FIXED = tDELAY + VREF x (CSS/ISS) tSTART-UP_ADJ = tDELAY + VADJ x (CSS/ISS) where: tDELAY is a fixed delay of 100 s. VREF is a 0.5 V internal reference for the fixed output model option. CSS is the soft start capacitance from the SS pin to GND. ISS is the current sourced from the SS pin (10 A). VADJ is the voltage at the VADJ pin equal to RADJ x IADJ. Table 1. Evaluation Board Hardware Components Component U1 Calculate the output voltage (VOUT) by VOUT = AD x (RADJ x IADJ) where: AD is the gain factor with a typical value of 2.99 between the VADJ pin and VOUT pin. RADJ is the resistor connected between the VADJ pin and ground. IADJ is the 50 A constant current from the VADJ pin. The ADP1764-1.0-EVALZ and ADP1765-1.0-EVALZ fixed evaluation boards use a 1.0 V output model. Do not connect R1 for the fixed output option. C1 C2 C3 C4 C5 J1 R1 R2 Rev. 0 | Page 3 of 9 Description ADP1764 and ADP1765 low dropout linear regulators. For the fixed output option, U1 uses the 1.0 V output option of the ADP1764 and the ADP1765. For the adjustable output option, U1 uses the adjustable option of the ADP1764 and the ADP1765 and is set to 1.0 V. Input bypass capacitor (CIN), 22 F, 0603 size. Output capacitor (COUT), 22 F, 0603 size. Soft start capacitor (CSS), 1000 pF, 0603 size. (not installed in the evaluation board) Regulator capacitor (CREG), 1 F, 0603 size. Reference capacitor (CREG), 1 F, 0603 size. Jumper (connects EN to VIN for automatic startup) Adjust resistor (RADJ) used to set the output voltage of the adjustable version of the ADP1764 and the ADP1765. Pull-up resistor (RPULL-UP) used for the open-drain PG output pin. UG-1072 ADP1764-EVALZ/ADP1765-EVALZ User Guide OUTPUT VOLTAGE MEASUREMENTS VOLTMETER VOLTAGE SOURCE 1.29999 + + - - 15194-003 LOAD Figure 3. Output Voltage Measurement Setup Figure 3 shows how the evaluation boards 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 expected to dissipate across it. Use an electronic load as an alternative. Ensure the voltage source can supply enough current for the expected load levels. Follow these steps to connect the evaluation board to a voltage source and voltmeter: 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 on the evaluation board. 3. 4. 5. Connect a load between the VOUT pad and one of the GND pads on the evaluation board. Connect the negative terminal of the voltmeter to one of the GND pads on the evaluation board. Connect the positive terminal of the voltmeter to the VOUT pad on the evaluation board. 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 ohmic voltage drops (IR). Rev. 0 | Page 4 of 9 ADP1764-EVALZ/ADP1765-EVALZ User Guide UG-1072 LINE REGULATION MEASUREMENTS DROPOUT VOLTAGE MEASUREMENTS For line regulation measurements, the change in the output of the regulator is measured when the 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 line regulation measurement, VIN must be varied between VOUT + 0.2 V (or 1.1 V, whichever is greater) and 1.98 V. For example, for an ADP1764 or an ADP1765 device with a fixed 1.3 V output, VIN must be varied between 1.5 V and 1.98 V. This measurement can be repeated under different load conditions. Figure 4 shows the typical line regulation performance of an ADP1764 and an ADP1765 with a fixed 1.3 V output. The dropout voltage can be measured using the configuration shown in Figure 3. Dropout voltage is defined as the input to output voltage differential when the input voltage is set to the nominal output voltage. The ADP1764 and the ADP1765 only enter dropout mode for output voltages of at least 1.2 V. For lower voltage outputs, the ADP1764 and the ADP1765 enter undervoltage lockout and shut down. The dropout voltage increases with larger loads. 1.305 = 0.1A = 1.0A = 2.0A = 3.0A = 4.0A = 5.0A 0.10 1.303 0.09 1.302 0.08 1.301 0.07 1.300 0.06 VDROP (V) VOUT (V) 1.304 ILOAD ILOAD ILOAD ILOAD ILOAD ILOAD 1.299 1.298 1.66 1.74 1.82 1.90 1.98 0.02 15194-004 1.58 VIN (V) 0.01 Figure 4. Output Voltage vs. Input Voltage at VOUT = 1.3 V, TA = 25C 0 0.1 LOAD REGULATION MEASUREMENTS 1 10 LOAD CURRENT (A) 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 load regulation measurement. The load current can be varied from 0 mA to 4 A for the ADP1764 and 0 mA to 5 A for the ADP1765. Figure 5 shows the typical load regulation performance of an ADP1764 and an ADP1765 with a fixed 1.3 V output for an input voltage of 1.5 V. 1.304 1.303 VOUT (V) 0.04 0.03 1.297 1.296 1.50 0.05 15194-006 1.306 For accurate measurements, use a second voltmeter to monitor the input voltage across the input capacitor. The input supply voltage may need adjusting to account for IR drops, especially when using large load currents. Figure 6 shows the typical curve of dropout voltage measurements with different load currents. Figure 6. Dropout Voltage vs. Load Current, VOUT = 1.3 V, TA = 25C GROUND CURRENT MEASUREMENTS Figure 8 shows how the ADP1764 and ADP1765 evaluation boards can connect to a voltage source and an ammeter for ground current measurements. A resistor can be used as the load for the regulator. Ensure the resistor has a power rating that is adequate to handle the power expected to be dissipated across it. Use an electronic load as an alternative. Ensure that the voltage source can supply enough current for the expected load levels. 1.302 Follow these steps to connect the evaluation board to a voltage source and ammeter: 1.301 1. 2. 1.300 1.299 3. 1.298 4. 1.296 0.1 1 LOAD CURRENT (A) 10 15194-005 1.297 Figure 5. Output Voltage vs. Load Current at VIN = 1.5 V, VOUT = 1.3 V, TA = 25C 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 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 on the evaluation board and the negative terminal of the voltage source. 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. Rev. 0 | Page 5 of 9 ADP1764-EVALZ/ADP1765-EVALZ User Guide GROUND CURRENT CONSUMPTION 24 When the device is disabled (EN = GND), the ground current drops to less than 2 A. 20 18 ILOAD ILOAD ILOAD ILOAD ILOAD ILOAD = 0.1A = 1.0A = 2.0A = 3.0A = 4.0A = 5.0A 16 IGND (mA) 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 (4 A for the ADP1764 and 5 A for the ADP1765). Figure 7 shows the typical ground current consumption for various load levels at VOUT = 1.3 V and TA = 25C. 22 14 12 10 8 6 4 2 0 1.5 1.6 1.7 1.9 1.8 2.0 VIN (V) Figure 7. Ground Current vs. Input Voltage, VOUT = 1.3 V, TA = 25C VOLTAGE SOURCE - + LOAD AMMETER 0.012345 + 15194-008 - Figure 8. Ground Current Measurement Setup Rev. 0 | Page 6 of 9 15194-007 UG-1072 ADP1764-EVALZ/ADP1765-EVALZ User Guide UG-1072 15194-009 EVALUATION BOARD SCHEMATICS AND ARTWORK 15194-010 Figure 9. Fixed Output Schematic Figure 10. Adjustable Output Schematic Rev. 0 | Page 7 of 9 15194-011 ADP1764-EVALZ/ADP1765-EVALZ User Guide Figure 11. Top Layer 15194-012 UG-1072 Figure 12. Bottom Layer Rev. 0 | Page 8 of 9 ADP1764-EVALZ/ADP1765-EVALZ User Guide UG-1072 ORDERING INFORMATION BILL OF MATERIALS Table 2. Reference Designator C1, C2 C31 C4, C5 J1 R1 R2 U1 1 Description Capacitors, MLCC, 22 F, 10 V, 0603, X5R Capacitor, MLCC, 1000 pF, 100 V, 0603, X7R Capacitors, MLCC, 1 F, 10 V, 0603, X7R Header/jumper, single, STR, two pins Resistor, 0603, 6.8 k, 1% tolerance (do not install on the fixed model) Resistor, 0603, 100 k, 1% tolerance IC, low input, low dropout regulators, including the following devices: Manufacturer Murata (or equivalent) Murata (or equivalent) Murata (or equivalent) FCI Any manufacturer Any manufacturer Analog Devices, Inc. Part Number GRM188R61A226ME15D GRM188R72A102KA01D GRM188R71A105KA61D 69157-102HLF Depends on manufacturer Depends on manufacturer ADP1764ACPZ-1.0-R7 ADP1765ACPZ-1.0-R7 ADP1764ACPZ-R7 ADP1765ACPZ-R7 Not installed in the evaluation board. 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. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term "Third Party" includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. 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Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed. (c)2017 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG15194-0-1/17(0) Rev. 0 | Page 9 of 9