EVAL-ADP7156 User Guide UG-809 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 ADP7156 Ultralow Noise, 1.2 A, Fixed Output, RF Linear Regulator FEATURES EVALUATION BOARD LAYOUT 12948-001 Power supply rejection ratio (PSRR) 80 dB from 1 kHz to 100 kHz; 60 dB at 1 MHz, VOUT = 3.3 V, VIN = 4.0 V Low noise 0.9 µV rms total integrated noise from 100 Hz to 100 kHz 1.6 µV rms total integrated noise from 10 Hz to 100 kHz Noise spectral density: 1.7 nV/√Hz from 10 kHz to 1 MHz Low dropout voltage: 120 mV typical at VOUT = 3.3 V, IOUT = 1.2 A Maximum output current: 1.2 A Input voltage range: 2.3 V to 5.5 V Low quiescent and shutdown current Initial accuracy: ±0.6% at ILOAD = 10 mA Accuracy over line, load, and temperature: ±1.5% 10-lead, 3 mm × 3 mm LFCSP package EVALUATION KIT CONTENTS Figure 1. ADP7156CP-3.3EVALZ Printed Circuit Board (PCB) Layout ADP7156CP-3.3EVALZ ADDITIONAL EQUIPMENT NEEDED A dc power supply Multimeters for voltage and current measurements Electronic or resistive loads GENERAL DESCRIPTION The ADP7156CP-3.3EVALZ evaluation board demonstrates the operation and functionality of the ADP7156 ultralow noise, 1.2 A, fixed output, radio frequency (RF) linear regulator in a 10-lead LFCSP package. Complete specifications for the ADP7156 ultralow noise, 1.2 A, linear regulator are available in the ADP7156 data sheet available from Analog Devices, Inc., and should be consulted in conjunction with this user guide when using the evaluation board. Simple device measurements, such as line and load regulation, dropout voltage, and ground current, can be demonstrated using only a single voltage supply, load resistors, and a voltmeter or an ammeter. PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 8 UG-809 EVAL-ADP7156 User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Line Regulation Measurements ...................................................5 Evaluation Kit Contents ................................................................... 1 Load Regulation Measurements ..................................................5 Additional Equipment Needed ....................................................... 1 Dropout Voltage Measurements..................................................5 General Description ......................................................................... 1 Ground Current Measurements ..................................................6 Evaluation Board .............................................................................. 1 Ground Current Consumption ...................................................7 Revision History ............................................................................... 2 Ordering Information .......................................................................8 Evaluation Board Hardware ............................................................ 3 Bill of Materials ..............................................................................8 Evaluation Board Configurations .............................................. 3 Output Voltage Measurements ................................................... 4 REVISION HISTORY 3/16—Revision 0: Initial Version Rev. 0 | Page 2 of 8 EVAL-ADP7156 User Guide UG-809 EVALUATION BOARD HARDWARE EVALUATION BOARD CONFIGURATIONS Table 1. ADP7156CP-3.3EVALZ The ADP7156CP-3.3EVALZ evaluation board comes supplied with components as shown in Table 1. The schematics of the evaluation board configuration are shown in Figure 2. The ADP7156 is available in 16 fixed output voltage options, ranging from 1.2 V to 3.3 V. Component U1 C1 C2 C3 C4 C5 C6, C7 R1 R2 JP1 Description ADP7156ACPZ-3.3-R7 Input bypass capacitor (CIN) VREG bypass capacitor (CREG) VREF bypass capacitor (CREF) Bypass capacitor (CBYP) Output capacitor (COUT) Optional output capacitors (not installed in the evaluation board) Reference short resistor Reference resistor for adjustable output versions only (not installed in the evaluation board for fixed output versions) Jumper (connects the EN pin to the VIN pin for automatic startup) TP1 U1 1 P5 1 2 3 4 5 6 7 8 C1 10µF JP1 1 ADP7156 1 9 VIN VOUT 10 2 VIN VOUT 3 5 EN VOUT_SENSE 4 BYP 8 VREG 7 REF 6 REF_SENSE EP TP3 1 2 C4 AGND 1µF AGND C2 1µF 0Ω C3 1µF P6 1 C5 10µF AGND C6 DNI1 C7 DNI1 1 2 3 4 5 6 7 8 PAD R1 AGND TP2 AGND R2 DNI1 AGND AGND 1 2 3 4 P4 P3 P2 P1 1 2 3 4 1 2 3 4 1 2 3 4 1DNI = DO NOT INSTALL. DO NOT INSTALL THIS COMPONENT IN THE EVALUATION BOARD. Figure 2. ADP7156CP-3.3EVALZ Evaluation Board Schematic Rev. 0 | Page 3 of 8 12948-002 AGND UG-809 EVAL-ADP7156 User Guide OUTPUT VOLTAGE MEASUREMENTS VOLTMETER VOLTAGE SOURCE 3.29999 + – + – 12948-004 LOAD Figure 3. Output Voltage Measurement Setup for the ADP7156CP-3.3EVALZ Figure 3 shows the connections to a voltage source and a voltmeter for basic output voltage accuracy measurements for the ADP7156CP-3.3EVALZ. Use a resistor as the load for the regulator. Ensure the resistor has a power rating that can handle the power dissipated across it. An electronic load can also be used as an alternative to using a resistor load. Ensure the voltage source supplies enough current for the expected load levels. The steps on how to connect the ADP7156CP-3.3EVALZ to a voltage source and a voltmeter are as follows: 1. 2. Connect the negative terminal of the voltage source to one of the GND pins on the evaluation board. Connect the positive terminal of the voltage source to the VIN pin on the evaluation board. 3. 4. 5. Connect a load between the evaluation board VOUT pin and one of the GND pins. Connect the negative terminal of the voltmeter to one of the GND pins on the evaluation board. Connect the positive terminal of the voltmeter to the VOUT pin on the evaluation board. When these steps are complete, turn on the voltage source. If the JP1 jumper is inserted (connecting the EN pin to the VIN pin for automatic startup), the regulator powers up. If the load current is large, connect the voltmeter as close as possible to the output capacitor to reduce the effects of voltage drops. Rev. 0 | Page 4 of 8 EVAL-ADP7156 User Guide UG-809 LINE REGULATION MEASUREMENTS 3.35 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 maintain a minimal change in voltage with respect to varying input voltage levels. To ensure the device is not in dropout mode during this measurement, vary VIN between VOUT_NOM + 0.5 V (or 2.3 V, whichever is greater) and VIN_MAX. For example, if the ADP7156 has a fixed 3.3 V output, vary VIN between 3.8 V and 5.5 V. This measurement can be repeated under different load conditions. The typical line regulation performance of an ADP7156 with a fixed 3.3 V output is shown in Figure 4. 3.34 3.33 VOUT (V) 3.32 3.28 3.27 100m 1 10 ILOAD (A) Figure 5. Output Voltage (VOUT) vs. Load Current (ILOAD), VOUT = 3.3 V, TA = 25°C, CIN = COUT = 10 µF DROPOUT VOLTAGE MEASUREMENTS 3.31 Dropout voltage is defined as the input to output voltage differential when the input voltage is set to the nominal output voltage. This definition is only applicable to output voltages above 2.3 V. Dropout voltage increases with larger loads. Figure 3 shows the configuration for measuring dropout voltage. 3.30 3.29 3.28 3.27 4.0 4.2 4.4 4.6 4.8 VIN (V) 5.0 5.2 5.4 5.6 12948-006 3.26 3.25 3.8 10m Figure 4. Output Voltage (VOUT) vs. Input Voltage (VIN), VOUT = 3.3 V, TA = 25°C, CIN = COUT = 10 µF LOAD REGULATION MEASUREMENTS For more accurate measurements, use a second voltmeter to monitor the input voltage across the input capacitor. The input supply voltage can require adjusting for voltage drops, especially if using large load currents. The typical curve of dropout voltage measurements over varying load current levels is shown in Figure 6. 0.16 For load regulation measurements, the output voltage of the regulator is monitored while the load current is varied. For a good load regulation, the output must maintain a minimal voltage change with respect to varying load current levels. Hold the input voltage constant during this measurement. The load current can vary from 0 mA to 1.2 A. The typical load regulation performance of an ADP7156 with a fixed 3.3 V output for an input voltage of 3.8 V is shown in Figure 5. 0.14 VDROPOUT (V) 0.12 0.10 0.08 0.06 0.04 0.02 0 10m 12948-008 VOUT (V) 3.32 1m 12948-007 3.26 3.25 0.1m ILOAD = 0mA ILOAD = 10mA ILOAD = 100mA ILOAD = 600mA ILOAD = 1200mA 3.33 3.30 3.29 3.35 3.34 3.31 100 1 10 ILOAD (A) Figure 6. Dropout Voltage vs. Load Current (ILOAD), VOUT = 3.3 V, TA = 25°C, CIN = COUT = 10 µF Rev. 0 | Page 5 of 8 UG-809 EVAL-ADP7156 User Guide GROUND CURRENT MEASUREMENTS VOLTAGE SOURCE – + LOAD AMMETER 0.004599 + 12948-009 – Figure 7. Ground Current Measurement Setup for the ADP7156CP-3.3EVALZ Figure 7 shows the connections to a voltage source and an ammeter for ground current measurements for the ADP7156CP-3.3EVALZ. Use a resistor as the load for the regulator. Ensure the resistor has a power rating that can handle the power dissipated across it. An electronic load can also be used as an alternative to using a resistor load. Ensure that the voltage source supplies enough current for the expected load levels. The steps on how to connect the ADP7156CP-3.3EVALZ and to a voltage source and an ammeter are as follows: 1. 2. Connect the positive terminal of the ammeter to one of the GND pins on the evaluation board. 3. Connect the negative terminal of the ammeter to the negative terminal of the voltage source. 4. Connect a load between the VOUT pin and the negative terminal of the voltage source. When these steps are completed, turn on the voltage source. If the JP1 jumper is inserted (connecting the EN pin to the VIN pin for automatic startup), the regulator powers up. Connect the positive terminal of the voltage source to the VIN pin on the evaluation board. Rev. 0 | Page 6 of 8 EVAL-ADP7156 User Guide UG-809 GROUND CURRENT CONSUMPTION 14 ILOAD = 0mA ILOAD = 10mA ILOAD = 100mA ILOAD = 600mA ILOAD = 1200mA 13 Ground current measurements can determine how much current the internal circuits of the regulator consume while the circuits perform the regulation function. For efficiency, the regulator must consume as little current as possible. Typically, the regulator uses the maximum current when supplying the largest load level (1.2 A). The typical ground current consumption for various load current levels at VOUT = 3.3 V and TA = 25°C is shown in Figure 8. 12 11 10 IGND (mA) 9 8 7 6 5 4 When the device is disabled (EN = GND), the ground current typically drops to 0.2 µA. 3 2 0 3.8 4.0 4.2 4.4 4.6 4.8 VIN (V) 5.0 5.2 5.4 5.6 12948-011 1 Figure 8. Ground Current (IGND) vs. Input Voltage (VIN), VOUT = 3.3 V, TA = 25°C, CIN = COUT = 10 µF Rev. 0 | Page 7 of 8 UG-809 EVAL-ADP7156 User Guide ORDERING INFORMATION BILL OF MATERIALS Table 2. Reference Designator U1 C1, C5, C6 1, C71 C2, C4 C3 R1 R21 JP1 Description ADP7156, IC, ultralow noise, low dropout, linear regulator Capacitor, MLCC, 10 µF, 10 V, 0805, X5R, 10% Capacitor, MLCC, 1 µF, 10 V, 0805, X5R, 10% Capacitor, MLCC, 1 µF, 10 V, 0603, X5R, 10% Resistor, 0 Ω, 0603 case Resistor, 1%, 0603 case Jumper, plug, 2-position, single row VIN, VOUT, GND Header 0.100, single, straight, two pins 1 Manufacturer Analog Devices, Inc. TDK or equivalent TDK or equivalent TDK or equivalent Vishay Dale Vishay Dale Omron Electronics Inc-EMC Div Sullins Electronics/3M Part Number ADP7156ACPZ-3.3-R7 C2012X5R1A106K125AB C2012X5R1A105K/10 C1608X5R1A105K080AC CRCW06030000Z0EA CRCW0603xxxxF XG8S-0241 S1012E-36-ND 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. 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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. ©2016 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG12948-0-3/16(0) Rev. 0 | Page 8 of 8