ADP1761-EVALZ/ADP1762-EVALZ/ADP1763-EVALZ User Guide UG-954 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 ADP1761/ADP1762/ADP1763 Low VIN, Low Noise, CMOS Linear Regulators FEATURES ADP1761, ADP1762, AND ADP1763 EVALUATION BOARDS Input voltage range: 1.1 V to 1.98 V Output current range ADP1761: 0 mA to 1 A ADP1762: 0 mA to 2 A ADP1763: 0 mA to 3 A Output voltage accuracy: ±1.5% Operating temperature range: −40°C to +125°C GENERAL DESCRIPTION The ADP1761, the ADP1762, and the ADP1763 evaluation boards demonstrate the functionality of the ADP1761, the ADP1762, and the ADP1763 series of linear regulators. 14354-001 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. For full details on the ADP1761, the ADP1762, and the ADP1763 line regulators, see the ADP1761, the ADP1762, and the ADP1763 data sheets, which should be consulted in conjunction with this user guide when using this evaluation board. 14354-002 Figure 1. The ADP1761, the ADP1762, and the ADP1763 Fixed Board Figure 2. The ADP1761, the ADP1762, and the ADP1763 Adjustable Board PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 9 UG-954 ADP1761-EVALZ/ADP1762-EVALZ/ADP1763-EVALZ User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Load Regulation Measurements ..................................................5 General Description ......................................................................... 1 Dropout Voltage Measurements..................................................5 ADP1761, ADP1762, and ADP1763 Evaluation Boards ............. 1 Ground Current Measurements ..................................................6 Revision History ............................................................................... 2 Ground Current Consumption ...................................................6 Evaluation Board Hardware ............................................................ 3 Schematics and Silkscreens ..............................................................7 Evaluation Board Configurations .............................................. 3 Ordering Information .......................................................................9 Output Voltage Measurements ................................................... 4 Bill of Materials ..............................................................................9 Line Regulation Measurements .................................................. 5 REVISION HISTORY 4/16—Revision 0: Initial Version Rev. 0 | Page 2 of 9 ADP1761-EVALZ/ADP1762-EVALZ/ADP1763-EVALZ User Guide UG-954 EVALUATION BOARD HARDWARE Calculate the start-up time of the regulator by EVALUATION BOARD CONFIGURATIONS The ADP1761, the ADP1762, and the ADP1763 evaluation boards come supplied with different components, depending on the version ordered. Components common to all versions are C1, C2, C3, C4, C5, J1, and R2. Use R1 for the adjustable output version of the ADP1761, the ADP1762, and the ADP1763 evaluation boards. Figure 9 and Figure 10 show the schematics of these evaluation board configurations, and Table 1 describes the hardware components. The ADP1761, the ADP1762, and the ADP1763 adjustable option has an output voltage range of 0.5 V to 1.5 V. The output voltage is set to 1.1 V by the external 7.32 kΩ adjust resistor. Calculate the output voltage (VOUT) by tSTART-UP_FIXED = tDELAY + VREF × (CSS/ISS) tSTART-UP_ADJ = tDELAY + VADJ × (CSS/ISS) where: tDELAY is a fixed delay of 100 μs. VREF is a 0.5 V internal reference for the fixed output model option. CSS is the soft start capacitance from SS to GND. ISS is the current sourced from SS (10 μA). VADJ is the voltage at the VADJ pin equal to RADJ × IADJ. Table 1. Evaluation Board Hardware Components Component U1 VOUT = AD × (RADJ × IADJ) where: AD is the gain factor with a typical value of 3 between the VADJ pin and VOUT pin. RADJ is the resistor connected between the VADJ pin and ground. IADJ is the 50 μA constant current out of the VADJ pin. The ADP1761, the ADP1762, and the ADP1763 fixed option uses a 1.3 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 ADP1761, ADP1762, and ADP1763 low dropout linear regulators. For the fixed output option, U1 uses the 1.3 V output option of the ADP1761, the ADP1762, and the ADP1763. For the adjustable output option, U1 uses the adjustable option of the ADP1761, the ADP1762, and the ADP1763 and is set to 1.1 V. Input bypass capacitor (CIN), 10 μF, 0603 size. Output capacitor (COUT), 10 μF, 0603 size. Soft start capacitor (CSS), 10 nF, 0603 size. Regulator capacitor (CREG), 1 μF, 0603 size. Reference capacitor (CREG), 1 μF, 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 ADP1761, the ADP1762, and the ADP1763. Pull-up resistor (RPULL-UP) used for the open-drain PGOOD output pin. UG-954 ADP1761-EVALZ/ADP1762-EVALZ/ADP1763-EVALZ User Guide OUTPUT VOLTAGE MEASUREMENTS VOLTMETER VOLTAGE SOURCE 1.29999 + + – – 14354-004 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. 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 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 IR voltage drops. Rev. 0 | Page 4 of 9 ADP1761-EVALZ/ADP1762-EVALZ/ADP1763-EVALZ User Guide 1.303 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 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 ADP1761, an ADP1762, or an ADP1763 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 ADP1761, an ADP1762, and an ADP1763 with a fixed 1.3 V output. OUTPUT VOLTAGE (V) 1.301 0.01 0.1 1 14354-006 1.302 10 LOAD CURRENT (A) ILOAD ILOAD ILOAD ILOAD Figure 5. Output Voltage vs. Load Current at VIN = 1.5 V, VOUT = 1.3 V, TA = 25°C = 100mA = 1A = 2A = 3A DROPOUT VOLTAGE MEASUREMENTS 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 ADP1761, the ADP1762, and the ADP1763 only enter dropout mode for output voltages of at least 1.2 V. For lower voltage outputs, the ADP1761, the ADP1762, and the ADP1763 enter undervoltage lockout and shut down. The dropout voltage increases with larger loads. 1.306 1.304 1.302 1.6 1.7 1.8 1.9 2.0 INPUT VOLTAGE (V) 14354-005 1.300 1.298 1.5 1.302 Figure 4. Output Voltage vs. Input Voltage at VOUT = 1.3 V, TA = 25°C LOAD REGULATION MEASUREMENTS 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. 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 1 A for the ADP1761, 0 mA to 2 A for the ADP1762, and 0 mA to 3 A for the ADP1763. Figure 5 shows the typical load regulation performance of an ADP1761, an ADP1762, and an ADP1763 with a fixed 1.3 V output for an input voltage of 1.5 V. 100 90 80 70 60 50 40 30 20 10 0 0.1 1 LOAD CURRENT (A) 10 14354-007 OUTPUT VOLTAGE (V) 1.308 1.303 DROPOUT VOLTAGE (mV) 1.310 UG-954 Figure 6. Dropout Voltage vs. Load Current, VOUT = 1.3 V, TA = 25°C Rev. 0 | Page 5 of 9 UG-954 ADP1761-EVALZ/ADP1762-EVALZ/ADP1763-EVALZ User Guide GROUND CURRENT MEASUREMENTS GROUND CURRENT CONSUMPTION Figure 8 shows how the ADP1761, the ADP1762, or the ADP1763 evaluation board can be connected to a voltage source and an ammeter for ground current measurements. 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 (1 A for the ADP1761, 2 A for the ADP1762, and 3 A for the ADP1763). Figure 7 shows the typical ground current consumption for various load levels at VOUT = 1.3 V and TA = 25°C. 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 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 the device is disabled (EN = GND), the ground current drops to less than 2 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. 14 12 10 8 6 4 2 0 1.5 NO LOAD ILOAD = 10mA ILOAD = 100mA ILOAD = 500mA ILOAD = 1A ILOAD = 2A ILOAD = 3A 1.6 1.7 1.8 1.9 2.0 INPUT VOLTAGE (V) Figure 7. Ground Current vs. Input Voltage, VOUT = 1.3 V, TA = 25°C VOLTAGE SOURCE – + LOAD AMMETER 0.012345 + 14354-008 – Figure 8. Ground Current Measurement Setup Rev. 0 | Page 6 of 9 14354-009 Follow these steps to connect the evaluation board to a voltage source and ammeter: GROUND CURRENT (mA) 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. ADP1761-EVALZ/ADP1762-EVALZ/ADP1763-EVALZ User Guide UG-954 14354-109 SCHEMATICS AND SILKSCREENS Figure 9. Fixed Output Schematic Rev. 0 | Page 7 of 9 14354-109 ADP1761-EVALZ/ADP1762-EVALZ/ADP1763-EVALZ User Guide 14354-010 Figure 10. Adjustable Output Schematic 14354-011 UG-954 Figure 12. Bottom Layer Figure 11. Top Layer Rev. 0 | Page 8 of 9 ADP1761-EVALZ/ADP1762-EVALZ/ADP1763-EVALZ User Guide UG-954 ORDERING INFORMATION BILL OF MATERIALS Table 2. Reference Designator C1, C2 C3 C4, C5 J1 R1 R2 U1 Description Capacitors, MLCC, 10 μF, 6.3 V, 0603, X5R Capacitor, MLCC, 10 nF, 25 V, 0603, X7R Capacitors, MLCC, 1 μF, 10 V, 0603, X7R Header/jumper, single, STR, two pins Resistor, 0603, 7.32 kΩ, 1% tolerance (do not install on the fixed model) Resistor, 0603, 100 kΩ, 1% tolerance IC, low input, low dropout regulators, including the following devices: ADP1761-1.3-EVALZ ADP1762-1.3-EVALZ ADP1763-1.3-EVALZ ADP1761-ADJ-EVALZ ADP1762-ADJ-EVALZ ADP1763-ADJ-EVALZ Manufacturer Murata (or equivalent) Murata (or equivalent) Murata (or equivalent) FCI Any manufacturer Any manufacturer Analog Devices, Inc. Part Number GRM188R60J106ME47D GRM188R71E103KA0 GRM188R71A105KA61D 69157-102HLF Depends on manufacturer Depends on manufacturer ADP1761ACPZ-1.3-R7 ADP1762ACPZ-1.3-R7 ADP1763ACPZ-1.3-R7 ADP1761ACPZ-R7 ADP1762ACPZ-R7 ADP1763ACPZ-R7 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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