Evaluation Board for the High-Side Power Switch EVAL-ADP190 FEATURES GENERAL DESCRIPTION Ultrasmall 0.8 × 0.8 mm, 4-ball, 0.4 mm pitch WLCSP Low RDSON of 105 mΩ @ 1.8 V Low input voltage range of 1.2 V to 3.6 V 500 mA continuous operating current Operating temperature range: TJ = −40°C to +85°C The EVAL-ADP190 is used to demonstrate the functionality of the ADP190 power switch. Simple device measurements such as VIN to VOUT resistance (RDSON), ground current, and off state current can be demonstrated with just a single voltage supply, a voltmeter, a current meter, and load resistors. Full details about the ADP190 regulators are available in the ADP190 data sheet, which should be consulted when using the EVAL-ADP190. 07862-001 EVALUATION BOARD Figure 1. Rev. 0 Evaluation boards are only intended for device evaluation and not for production purposes. Evaluation boards are supplied “as is” and without warranties of any kind, express, implied, or statutory including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose. No license is granted by implication or otherwise under any patents or other intellectual property by application or use of evaluation boards. Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Analog Devices reserves the right to change devices or specifications at any time without notice. Trademarks and registered trademarks are the property of their respective owners. Evaluation boards are not authorized to be used in life support devices or systems. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2009 Analog Devices, Inc. All rights reserved. EVAL-ADP190 TABLE OF CONTENTS Features .............................................................................................. 1 Ground Current Consumption ...................................................5 General Description ......................................................................... 1 Shutdown Current Measurement ....................................................6 Evaluation Board .............................................................................. 1 Ordering Information .......................................................................7 Revision History ............................................................................... 2 Bill of Materials ..............................................................................7 Evaluation Board Schematic and Hardware ................................. 3 Ordering Guide .............................................................................7 VIN to VOUT Resistance (RDSON) ................................................ 4 ESD Caution...................................................................................7 Ground Current Measurement ....................................................... 5 REVISION HISTORY 2/09—Revision 0: Initial Version Rev. 0 | Page 2 of 8 EVAL-ADP190 EVALUATION BOARD SCHEMATIC AND HARDWARE VIN = 1.8V VOUT = 1.8V VIN C2 J1 U1 EN GND 07862-002 C1 VOUT Figure 2. Evaluation Board Schematic Table 1. Evaluation Board Hardware Components Component U1 C1 Function Power switch Input capacitor C2 Output capacitor J1 Jumper Description ADP190 high-side power switch. 0.1 µF input bypass capacitor. Required for stability and transient performance. Connect C1 from VIN to GND. 0.1 µF output capacitor. Required for stability and transient performance. Connect C2 from VOUT to GND. Jumper. Connects EN to VIN for automatic startup. Rev. 0 | Page 3 of 8 EVAL-ADP190 VIN TO VOUT RESISTANCE (RDSON) RDSON can be measured using the configuration shown in Figure 4. RDSON is defined as the input-to-output voltage differential divided by load current. 200 ILOAD ILOAD ILOAD ILOAD ILOAD 180 The voltmeter reading divided by the load current value gives the equivalent RDSON value. For more accurate measurements, a second voltage meter 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 3 shows a typical curve of RDSON measurements with different load currents. = 10mA = 100mA = 250mA = 350mA = 500mA RDSON (mΩ) 160 140 120 80 1.2 1.6 2.0 2.4 VIN (V) 2.8 3.2 3.6 07862-003 100 Figure 3. RDSON vs. Input Voltage, VIN (Includes ~15 mΩ Trace Resistance) RDSON VOLTMETER 0.035 VIN VOLTAGE SOURCE 07862-004 LOAD Figure 4. RDSON Measurement Rev. 0 | Page 4 of 8 EVAL-ADP190 GROUND CURRENT MEASUREMENT GROUND CURRENT CONSUMPTION Ground current measurement is a way of determining how much current the internal circuits of the regulator are consuming, while performing the power switch function. To be efficient, the power switch needs to consume as little current as possible. Figure 5 shows the typical ground current consumption for various load levels. 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. The voltage source can now be turned on. If J1 is inserted (connecting EN to VIN for automatic startup), the regulator powers up. 1.8 1.6 ILOAD ILOAD ILOAD ILOAD ILOAD = 10mA = 100mA = 250mA = 350mA = 500mA 1.4 1.2 1.0 0.8 0.6 1.2 1.7 2.2 2.7 3.2 VIN (V) Figure 5. Ground Current vs. Input Voltage, VIN VIN GND CURRENT VOLTAGE SOURCE AMMETER 0.035 07862-005 LOAD Figure 6. Ground Current Measurement Rev. 0 | Page 5 of 8 3.6 07862-006 Follow these steps to connect to a voltage source and ammeter: 2.0 GROUND CURRENT (µA) Figure 6 shows 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 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 used can supply enough current for the expected load levels. If voltmeters are connected at the input or output terminals, subtract the current resulting from the shunt resistance of the voltmeter for accurate ground current measurement. EVAL-ADP190 SHUTDOWN CURRENT MEASUREMENT Figure 8 shows how the evaluation board can be connected to a voltage source and an ammeter for shutdown current measurements. The ammeter can also be connected to the GND terminal to measure the ground current, which is equal to the shutdown current when EN is tied to ground. Figure 7 shows the typical shutdown current consumption for various input voltages. Follow these steps to connect to a voltage source and ammeter: 1. 2. 3. 0.7 4. The voltage source can now be turned on. 0.5 0.4 0.3 0.2 0.1 0 –50 –25 0 25 50 75 100 JUNCTION TEMPERATURE, TJ (°C) 125 07862-007 Figure 7. Shutdown Current vs. Temperature and Input Voltage GND CURRENT VIN AMMETER VOLTAGE SOURCE 0.035 J1 07862-008 SHUTDOWN CURRENT (µA) 0.6 VIN = 1.2V VIN = 1.8V VIN = 2.5V VIN = 3.6V Connect the positive terminal (+) of the voltage source to the (+) of the ammeter. Connect the negative (−) terminal of the voltage source to GND pad on the evaluation board. Connect the negative terminal (−) of the ammeter to the VIN pad on the evaluation board. Connect the EN pin to ground using Jumper J1. Figure 8. Shutdown Current Measurement Rev. 0 | Page 6 of 8 EVAL-ADP190 ORDERING INFORMATION BILL OF MATERIALS Table 2. Qty 2 1 1 Reference Designator C1, C2 J1 U1 Description Capacitor, MLCC, 0.1 µF, 10 V, 0402, X5R Header, single, STR, 2 pins IC, power switch ORDERING GUIDE Model ADP190CB-EVALZ1 1 Manufacturer/Vendor Murata or equivalent Digi-Key Corp. Analog Devices, Inc. ESD CAUTION Description Evaluation Board Z = RoHS Compliant Part. Rev. 0 | Page 7 of 8 Vendor Part No. GRM155R61A104KA01D S1012E-36-ND ADP190 EVAL-ADP190 NOTES ©2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. EB07862-0-2/09(0) Rev. 0 | Page 8 of 8