Evaluation Board for ADP1864 with Web Design Tool EVAL-ADP1864 FEATURES EVALUATION BOARD DESCRIPTION Powerful companion design tool for quick design times Input voltage range: 3.15 V to 14 V Output voltage range: 0.8 V to VIN Output current: up to 10 A Accommodating layout with multiple packages for diodes, PFETs, input and output capacitors, and inductors 3 PFETs in parallel for high current applications Programmable compensation for optimizing transient performance Programmable current limit with sense resistor(s) Enable/shutdown logic Switching frequency: 580 kHz Kelvin connections for measuring input and output voltage The ADP1864 evaluation board is designed to be used with the ADP1864 Buck Design Software. The evaluation board is configured to provide 3.3 V output at 3 A over an input voltage range of 9 V to 12 V. Through a versatile layout that accommodates several packages and a powerful companion design tool, the ADP1864 evaluation board can provide a wide variety of solutions, including up to a 5.0 V output at 10 A from a 12 V input. Kelvin connection terminals provide an accurate means for measuring the input and output voltages. SHIPPED CONFIGURATION Fully populated ADP1864-EVALZ Input voltage range: 9 V to 12 V Output voltage: 3.3 V Output current: 3 A Bare board ADP1864-BL-EVALZ Populated with only ADP1864 The evaluation board is designed to use the ADP1864 as an asynchronous, step-down dc-to-dc converter that uses a current mode pulse-width modulation control scheme. The ADP1864 drives a P-channel MOSFET that regulates an output voltage as low as 0.8 V with ±1.25% accuracy (up to 85°C), for up to 10 A load currents, from input voltages as high as 14 V. The ADP1864 provides system flexibility by allowing accurate setting of the current limit with an external resistor, while the output voltage is easily adjustable using two external resistors. For more details, see the ADP1864 data sheet. 05612-016 EVALUATION BOARD PHOTO Figure 1. ADP1864-EVALZ Rev. C 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. www.analog.com Tel: 781.329.4700 Fax: 781.461.3113 ©2006–2009 Analog Devices, Inc. All rights reserved. EVAL-ADP1864 TABLE OF CONTENTS Features .............................................................................................. 1 Enter Performance Specifications ...............................................8 Shipped Configuration .................................................................... 1 Select Component Values and Sizes ...........................................9 Evaluation Board Description......................................................... 1 Power Dissipation and Temperature ..........................................9 Evaluation Board Photo ................................................................... 1 Efficiency ........................................................................................9 Revision History ............................................................................... 2 Application Schematic ..................................................................9 Powering the Evaluation Board ...................................................... 3 BOM Summary .............................................................................9 Input Power Source ...................................................................... 3 Modifying the Evaluation Board .................................................. 10 Output Load .................................................................................. 3 Changing the MOSFET ............................................................. 10 Input and Output Voltmeters...................................................... 3 Changing the Sense Resistor ..................................................... 10 Turning On the Evaluation Board .............................................. 3 Changing the Diode ................................................................... 10 Measuring the Performance of the Evaluation Board ................. 4 Changing the Output Inductor ................................................ 10 Measuring Output Voltage Ripple.............................................. 4 Changing the Output Capacitors ............................................. 10 Measuring the Switching Waveform .......................................... 4 Changing the Output Voltage ................................................... 11 Measuring the Gate-to-Source Waveform ................................ 4 Schematic ......................................................................................... 12 Measuring the Inductor Current ................................................ 4 Assembly Drawing ......................................................................... 13 Measuring Efficiency and Load Regulation.............................. 4 Ordering Information .................................................................... 14 Measuring Line Regulation ......................................................... 4 Bill of Materials ........................................................................... 14 Monitoring Short-Circuit Behavior ........................................... 4 Ordering Guide .......................................................................... 14 Typical Performance Characteristics ............................................. 5 ESD Caution................................................................................ 14 Excel Design Tool Interface ............................................................. 8 REVISION HISTORY 7/09—Rev. B to Rev. C Changes to Changing the Output Voltage Section, Equation .. 11 6/07—Rev. 0 to Rev. A 4/06—Revision 0: Initial Version 6/08—Rev. A to Rev. B Changes to Shipped Configuration Section .................................. 1 Changes to Figure 1 .......................................................................... 1 Changes to Powering the Evaluation Board Section ................... 3 Changes to Figure 3 Caption ........................................................... 4 Changes to Excel Design Tool Interface Section Heading .......... 8 Changes to Figure 18 Caption......................................................... 8 Changes to BOM Summary Section .............................................. 9 Changes to Changing the Output Capacitors Section ............... 10 Changes to Figure 19 ...................................................................... 12 Added Figure 20 and Figure 21..................................................... 13 Changes to Table 1 .......................................................................... 14 Added Table 2.................................................................................. 14 Changes to Ordering Guide .......................................................... 14 Rev. C | Page 2 of 16 EVAL-ADP1864 POWERING THE EVALUATION BOARD The ADP1864 evaluation board is supplied fully assembled or, optionally, populated with only the ADP1864 IC. Before applying power to the evaluation board, refer to Figure 2 and follow the procedures in this section. ammeter terminal to the evaluation board VOUT terminal, the negative (−) ammeter terminal to the positive (+) load terminal, and the negative (−) load terminal to the evaluation board GND terminal just above the VOUT terminal. INPUT POWER SOURCE After the load is connected, make sure that it is set to the proper current before powering the ADP1864 evaluation board. Before connecting the power source to the ADP1864 evaluation board, make sure that it is turned off. If the input power source includes a current meter, use that meter to monitor the input current. Connect the positive terminal of the power source to the VIN terminal on the evaluation board, and the negative terminal of the power source to the GND terminal just below the VIN terminal. If the power source does not include a current meter, connect a current meter in series with the input source voltage. Connect the positive lead (+) of the power source to the ammeter positive (+) connection, the negative lead (−) of the power source to the GND terminal just below the VIN terminal on the evaluation board, and the negative lead (−) of the ammeter to the VIN terminal on the board. OUTPUT LOAD Although the ADP1864 evaluation board can sustain the sudden connection of the load, it is possible to damage the load if it is not properly connected. Make sure that the board is turned off before connecting the load. If the load includes an ammeter, or if the current is not measured, connect the load directly to the evaluation board with the positive (+) load connection to the VOUT terminal and the negative (−) load connection to the GND terminal just above the VOUT terminal. If an ammeter is used, connect it in series with the load; connect the positive (+) INPUT AND OUTPUT VOLTMETERS Measure the input and output voltages with voltmeters. Connect the voltmeter measuring the input voltage with the positive lead (+) connected to TP1 and the negative lead (−) connected to TP2. Connect the voltmeter measuring the output voltage with the positive lead (+) connected to TP4 and the negative lead (−) connected to TP3. Make sure to connect the voltmeters to the appropriate evaluation board terminals and not to the load or power source themselves. If the voltmeters are not connected directly to the evaluation board at these Kelvin connection test points (TP1 to TP4), the measured voltages will be incorrect due to the voltage drop across the leads connecting the evaluation board to both the source and load. TURNING ON THE EVALUATION BOARD After the power source and load are connected to the ADP1864 evaluation board, the board can be powered for operation. Slowly increase the input power source voltage until the input voltage exceeds the minimum input operating voltage of 9 V. If the load is not already enabled, enable the load and check that it is drawing the proper current and that the output voltage maintains voltage regulation. VOLTAGE SOURCE VIN IIN SWITCH NODE WAVEFORM ELECTRONIC LOAD VOLTMETER VOUT IOUT INDUCTOR CURRENT WAVEFORM CURRENT PROBE OUTPUT VOLTAGE WAVEFORM Figure 2. Measurement Setup Rev. C | Page 3 of 16 05612-018 OSCILLOSCOPE EVAL-ADP1864 MEASURING THE PERFORMANCE OF THE EVALUATION BOARD MEASURING OUTPUT VOLTAGE RIPPLE MEASURING THE INDUCTOR CURRENT To observe the output voltage ripple, place an oscilloscope across the output capacitor (COUT) with the probe ground lead at the negative (−) capacitor terminal and the probe tip at the positive (+) capacitor terminal. Set the oscilloscope to ac-coupled, 100 mV/division, and 2 μs/division time base. For a more accurate measurement, the test leads should be as short as possible, as shown in Figure 3. The output ripple voltage increases as the input voltage is increased because the duty cycle is decreased. The inductor current can be measured by removing one end of the inductor from its pad and connecting a wire with adequate current handling capabilities from the pad to inductor lead. Then, a current probe can be used to measure the current through the inductor, as shown in Figure 2. MEASURING THE SWITCHING WAVEFORM To observe the switching waveform with an oscilloscope, place the oscilloscope probe tip to TP6 with the probe ground at test point near the anode of the diode, which is on the GND plane. Set the scope to dc coupling, 2 V/division, and 2 μs/division time base. The switching waveform should alternate between the negative forward voltage drop of the diode and approximately the input voltage with resonances near the switching transitions. MEASURING THE GATE-TO-SOURCE WAVEFORM Using the voltages from the voltmeters and current readings from the source and load, calculate efficiency from the following equation: n= VOUT × I OUT V IN × I IN Sweep the load across the full load range to obtain the efficiency and load regulation plot. The efficiency results should correspond to the ADP1864 Buck Design Software. MEASURING LINE REGULATION Vary the input voltage and examine the change in the output voltage reading from the voltmeter. MONITORING SHORT-CIRCUIT BEHAVIOR Place a current probe on the load cable that connects the output to the positive input of the electronic load. Monitor the output voltage with a similar technique used to measure the output voltage ripple; however, dc couple the scope with a 5 V/div setting. Many electronic loads have short-circuit capability. Enable this function on the load and ensure that the circuit current limits at the correct current. 05612-017 To observe the gate-to-source waveform, place an oscilloscope probe at TP7 with the ground lead at the test point nearest to the anode of the diode, which is on the GND plane. Place another oscilloscope probe at the source of the MOSFET with the ground lead at the test point nearest the anode of the diode. Use the math functions of the oscilloscope to observe the gateto-source waveform. Do not place a probe across gate-to-source terminals of the MOSFET unless a differential probe is being used. For a more accurate measurement, the test leads should be as short as possible, as shown in Figure 3. MEASURING EFFICIENCY AND LOAD REGULATION Figure 3. Measuring Technique for Output Voltage Ripple Rev. C | Page 4 of 16 EVAL-ADP1864 TYPICAL PERFORMANCE CHARACTERISTICS C3 DC1M 5.00V/div –5.00V ofst Timebase –1.32µs Trigger WStream 500ns Auto 12.5ks 2.5GSPS Edge C4 DC 3.05V Positive C3 BWL AC1M 50.0mV/div 0.0mV ofst Figure 4. Switch Node Ringing at 3 A Load; VIN = 9 V Timebase –4.76µs Trigger WStream 2.00ns Auto 2.5GSPS Edge 50.0ks C4 DC 4.55V Positive 05612-005 C4 05612-002 C4 Figure 7. VOUT Ripple at 3 A Load; VIN = 12 V C4 Timebase –1.19µs Trigger WStream 500ns Auto 12.5ks 2.5GSPS Edge C4 DC 4.55V Positive C4 DC1M 5.00V/div –5.00V ofst Figure 5. Switch Node Ringing at 3 A Load; VIN = 12 V Timebase –1.19µs Trigger 500ns Stop WStream 2.5GSPS Edge 12.5ks C4 DC 4.55V Positive 05612-006 DC1M 5.00V/div –5.00V ofst C4 DC 7.00V Positive 05612-007 C4 05612-003 C4 Figure 8. Gate Waveform 3 A; VIN = 9 V C3 C3 BWL AC1M 50.0mV/div 0.0mV ofst Timebase 0.00µs Trigger WStream 2.00ns Single 50.0ks 2.5GSPS Edge C1 DC –168mV Positive 05612-004 C4 C4 DC1M 5.00V/div –5.00V ofst Figure 6. VOUT Ripple at 3 A Load; VIN = 9 V Timebase –2.38µs Trigger WStream 1.00ns Stop 2.5GSPS Edge 25.0ks Figure 9. Gate Waveform 3 A; VIN = 12 V Rev. C | Page 5 of 16 EVAL-ADP1864 IOUT VOUT IOUT C3 C2 VOUT DC C3 BWL AC1M 1.00A/div 100mV/div 0mA offset 0.0mV ofst Timebase –476µs Trigger 200µs Auto WStream 1.00MS 500MSPS Edge C2 DC 2.21A Positive C2 DC C3 DC1M 5.00A/div 5.00V/div –5.00A ofst –10.00V ofst Timebase –119µs Trigger WStream 50.0µs Stop 1.25MS 2.5GSPS Edge C2 DC 5.35A Positive 05612-011 C2 05612-008 C3 Figure 13. Short Circuit; VIN = 12 V Figure 10. Load Transient; 1.5 A to 3 A at 250 mA/μs, VIN = 9 V IOUT IOUT C2 VOUT COMP/EN C3 C4 VOUT C3 C2 DC C3 BWL AC1M 1.00A/div 100mV/div 0mA offset 0.0mV ofst Timebase –476µs Trigger 200µs Auto WStream 1.00MS 500MSPS Edge C2 DC 2.21A Positive C3 DC1M C4 DC1M 1.00V/div 1.00V/div –2.030V ofst 0mV offset Figure 11. Load Transient; 1.5 A to 3 A at 250 mA/μs, VIN = 12 V Timebase –119µs Trigger C2 DC WStream 50.0µs Stop 1.15V 1.25MS 2.5GSPS Edge Negative 05612-012 DC 2.00A/div 2.860A ofst 05612-009 C2 Figure 14. Disable; VIN = 9 V IOUT C2 IOUT COMP/EN C4 C2 VOUT VOUT C3 C3 C2 DC C3 DC1M 5.00A/div 5.00V/div –5.00A ofst –10.00V ofst Timebase –119µs Trigger WStream 50.0µs Stop 1.25MS 2.5GSPS Edge C2 DC 5.35A Positive C3 Figure 12. Short Circuit; VIN = 9 V DC1M C4 DC1M 1.00V/div 1.00V/div –2.030V ofst 0mV offset Timebase –119µs Trigger C3 DC WStream 50.0µs Stop 1.15V 1.25MS 2.5GSPS Edge Negative Figure 15. Disable; VIN = 12 V Rev. C | Page 6 of 16 05612-013 DC 2.00A/div 2.860A ofst 05612-010 C2 EVAL-ADP1864 1.0 0.9 3.289 VIN = 9V 0.8 OUTPUT VOLTAGE (V) 3.284 VIN = 12V 0.6 0.5 0.4 0.3 3.279 VIN = 9V 3.274 VIN = 12V 3.269 0.2 0 0.01 0.1 1 LOAD CURRENT (A) 10 3.264 0 0.5 1.0 1.5 2.0 LOAD CURRENT (A) 2.5 Figure 17. Load Regulation Figure 16. Efficiency vs. Load Current Rev. C | Page 7 of 16 3.0 3.5 05612-015 0.1 05612-014 EFFICIENCY(%) 0.7 EVAL-ADP1864 05612-019 EXCEL DESIGN TOOL INTERFACE Figure 18. Excel Design Tool Interface ENTER PERFORMANCE SPECIFICATIONS In this section, the user can provide the specifications on how the power supply being designed needs to perform. The voltage range for the first two pull-down menus (Vinmin and Vinmax) is 3.15 V to 14 V. In the third pull-down menu, the user provides the required regulated output voltage (Vout), which needs to be less than Vinmin and Vinmax, because this tool is to be used with the buck topology. The next pull-down menu is the required output current (Ioutmax). It is wise to design for the peak current the regulator needs to provide, even if the peak is required for only a short period of time. Without taking this into consideration, it is possible to hit the current limit when peak current is needed. The information provided in the ambient temperature (Tmax ambient) pull-down menu allows the estimated temperature to be computed for each component. This is a required piece of information to ensure that the parts selected are thermally capable of handling the rise in temperature associated with internal losses of the parts. The switching frequency is internally set in the ADP1864 to 580 kHz. There is a tolerance on this specification, and the minimum and maximum limits can be selected through the pull-down menu (Fsw). When the switching frequency is at a minimum, the current in the inductor rises to a slightly higher amplitude than in the nominal switching frequency case. Consequently, the voltage across the sense resistor will also be higher, which needs to be accounted for when the tool calculates the current limit trip point. A robust design should always consider this minimum switching frequency. Additionally, the performance of the system can be viewed when selecting the maximum switching frequency from the pull-down menu. The inductor ripple selection (IripplemaxL) affects several parameters. As a general guideline, it is recommended to set this value between 30% to 50% of the output load. A small inductor allows energy to be transferred from the input to the output more quickly during a load step, resulting in a smaller output voltage excursion during the load step. However, a small inductor requires a higher current rating of the inductor itself, that is, the ripple current is inversely proportional to the size of the inductor. Higher ripple current also translates to higher output voltage ripple for a fixed capacitance value. Selecting the maximum output voltage ripple from the next pull-down menu (Vripple ppk) determines the amount and type (MLCC, aluminum electrolytic, for example) of output capacitance needed and correspondingly how the compensation components are sized. Rev. C | Page 8 of 16 EVAL-ADP1864 As a general guideline, it is recommended to set this value around 5%. In the next pull-down menu (Ioutstep), the user can select the estimate of the largest step in load the regulator will demand. This, in conjunction with the allowable voltage excursion on load transient (in the Vout step error pull-down menu), delegates how much output capacitance is required. If the Ioutstep specification is not known, entering a 50% load step provides an adequate design for most applications at the power level the ADP1864 is designed to be used. SELECT COMPONENT VALUES AND SIZES When starting a new design, it is recommended to reset each of the pull-down menus to Auto, which is at the top of the list for each option. With these settings, the tool automatically calculates the most efficient design and provides that solution. If the user would like to explore how other components affect various parameters of the system, all the parts of the regulator except the compensation components can be changed through the use of the pull-down menus in this section. Note that the tool provides a bill of materials that maintains all specifications entered in the Enter Performance Specifications section of the tool when a component is changed. Accordingly, other component values can change as well. The feedback resistor selector at the bottom of this section finds the right combination of resistors to provide the feedback voltage with the 0.8 V. POWER DISSIPATION AND TEMPERATURE The Power Dissipation and Temperature section of the tool provides the user with the power dissipation of each part at the full rated current at both the maximum and minimum input voltages. It also provides the user with the estimated temperature of the ADP1864, the MOSFET, the diode, and the inductor. These calculations are done taking into account the temperature rise due to dissipation as well as the ambient temperature. EFFICIENCY From the power dissipation information calculated in the Power Dissipation and Temperature section of the tool, the efficiency across the full load range is plotted for both maximum and minimum input voltages. APPLICATION SCHEMATIC The Application Schematic section provides a schematic of the ADP1864 evaluation board. The reference designators on the evaluation board match this schematic. BOM SUMMARY The BOM Summary provides the user with the final parts list necessary to meet all the requirements entered into the performance specifications section. Vendors, part numbers, individual and total area, along with a value for each component, are provided. If no part number is provided, a vital specification is given instead. This specification can be used to find a part to populate on the board. From this BOM, the user can modify the fully populated configuration or populate the bare board configuration to validate design changes. Rev. C | Page 9 of 16 EVAL-ADP1864 MODIFYING THE EVALUATION BOARD The ADP1864-EVALZ evaluation board is complete and tested for operation. Due to the versatility of the ADP1864 step-down dc-to-dc controller, the ADP1864 evaluation board can be modified for a variety of external components. Some of the most common modifications are described in this section. CHANGING THE MOSFET The ADP1864-EVALZ evaluation board is supplied with a Siliconix Si5435 power MOSFET. The layout can accommodate MOSFETs placed in parallel to accommodate higher current levels. Additionally, 8-lead SOIC, thermally enhanced 8-lead SOIC, 6-lead TSOP, 1206-8, and SOT-23 packages all have footprints available on the ADP1864 evaluation board. On resistances, gate charges and capacitances, gate-to-source thresholds, and maximum drain to source voltage ratings should all be considered before changing the MOSFET. CHANGING THE SENSE RESISTOR If an increase in current capability is desired, it may be necessary to change the current limit via the sense resistor. As supplied, two 33 mΩ resistors in parallel are used to sense current. For duty cycles <40%, the current limit voltage is 125 mV typically. For duty cycles >40%, use the slope factor (SF) vs. duty cycle plot in the ADP1864 data sheet to determine the actual current sense limit. for all these changes when the new inductance value is selected from the L1 pull-down menu. It then provides new suggestions for component values. The Applications Information section of ADP1864 data sheet also provides information concerning the implications of changing the output inductor. If the duty cycle is to exceed 40%, keep the ripple current to 30% to 50% of the output current so that the slope compensation remains effective. See the ADP1864 data sheet for more details. CHANGING THE OUTPUT CAPACITORS The ADP1864-EVALZ evaluation board is supplied with a 100 μF ceramic capacitor on the output. If the capacitance is insufficient to meet load transient requirements, a D-case tantalum capacitor footprint and an 8 mm electrolytic capacitor footprint are available to provide the capability to greatly increase the output capacitance. Any change in output capacitance also requires a change in compensation component values. To compensate for a change in output capacitor, use the following equations: RC = C C1 = C C0 = Note that across the full temperature range and input voltage range of the ADP1864, the current limit voltage can be as low as 80 mV. C C0 = CHANGING THE DIODE The ADP1864-EVALZ evaluation board is supplied with a Diodes, Inc. PDS1040L Schottky diode. The board can accommodate SMC, DPAK (TO-252), and other popular packages. The two primary factors to consider when changing the diode are the current handling capabilities as well as the maximum reverse dc blocking voltage. Because of switch node voltage excursions, it is recommended to select a diode with at least three times the reverse dc blocking voltage as the maximum input voltage for the application when no snubber circuit is used. CHANGING THE OUTPUT INDUCTOR The ADP1864-EVALZ evaluation board is populated with a Coilcraft DO3316P-332ML 3.3 μH inductor with a saturation current of 6.4 A. To operate at currents higher than this, the inductor needs to be modified to accommodate at least the higher current plus half the inductor ripple current. If the current demand is less, it could be advantageous to select a physically smaller and lower saturation current inductor for cost considerations. Changing the inductance value can affect the stress on the transistor and diode, the output voltage ripple, and the load transient response. The ADP1864 Buck Design Software accounts 2π × f UN × C OUT × ( ESR + R LOAD ) 2 × V OUT × R CL × G C G M × R LOAD 2 × V REF 3 2π × R C × f UN 2π × f UN G M × R LOAD × ESR × V REF or × ( ESR + R LOAD ) × R CL × G C × V OUT 3 , whichever is larger. 2π × R C × f SW where: fUN is the desired unity gain frequency in hertz (usually 40 kHz). COUT is output capacitance in farads. ESR is the effective series resistance of COUT in ohms. RLOAD is VOUT (volts)/maximum load current (amps). RCL is the parallel resistance of the current sense resistors in ohms. GC is the nominal gain of the current sense amplifier (12). GM is the nominal gain of the error amplifier (2.4 × 10−4 mhos). VREF is the nominal error amplifier reference voltage (0.8 V). fSW is the nominal switching frequency of the ADP1864 (580 kHz). If multiple output capacitors are used and of the same type and value, ESR is defined as the parallel effective series resistance of all the capacitors. If multiple output capacitors are used that are not of the same type and value, the analysis to calculate optimal compensation components is considerably more complicated and beyond the scope of this document. It is recommended to always refer to the manufacturer’s data for capacitance derating over applied voltage and temperature. Rev. C | Page 10 of 16 EVAL-ADP1864 CHANGING THE OUTPUT VOLTAGE The ADP1864-EVALZ evaluation board output regulation voltage can be changed by altering the voltage divider consisting of RF2 and RF1. The output regulation voltage is determined by the following equation: Modifying the output voltage changes the inductor ripple current and subsequently the output voltage ripple, transient response, and stress on the PFET. The design tool considers this and, if necessary, provides new component values. ⎛ R + RF1 ⎞ ⎟⎟ VOUT = 0.8 × ⎜⎜ F 2 RF1 ⎠ ⎝ Rev. C | Page 11 of 16 EVAL-ADP1864 SCHEMATIC RIN1 LS VIN TP1 CIN1 C1 CIN4 CIN2 TP2 EN ADP1864 R1 1 RC COMP PGATE 6 2 GND VIN 5 3 CF2 RF2 Q1-2 Q1-3 Q1-4 TP6 RCL2 RCL3 RCL4 D1 CS 4 FB Q1-5 TP5 RCL1 RF1 L2 TP7 Q1-1 CC0 CS RS L1 VOUT COUT2 TP4 COUT1 TP3 05612-001 CC1 U1 Figure 19. ADP1864-EVALZ Evaluation Board Schematic Rev. C | Page 12 of 16 EVAL-ADP1864 05612-020 1900mm ASSEMBLY DRAWING 1900mm 05612-021 Figure 20. ADP1864-EVALZ Evaluation Board Assembly Drawing, Front Figure 21. ADP1864-EVALZ Evaluation Board Assembly Drawing, Back Rev. C | Page 13 of 16 EVAL-ADP1864 ORDERING INFORMATION BILL OF MATERIALS Table 1. ADP1864-EVALZ Qty. 1 Package 6-lead TSOT Area (mm2) 9 Manufacturer and Part Number Analog Devices ADP1864AUJZ-R7 Designator U1 Value Comments CC0 33 pF 1 0603 1.3 X7R or COG ceramic, 10% tolerance CC1 0.82 nF 1 0603 1.3 X7R or COG ceramic, 10% tolerance CIN1 10 μF 1 1210 8 TDK C3225X7R1C106M COUT1 100 μF 1 1210 8.0 TDK C3225X5R0J107M RC 27.4 kΩ 1 0603 1.3 RCL1, RCL2 0.033 Ω 2 0805 6.4 RF1 80.6 kΩ 1 0603 1.3 RF2 249 kΩ 1 0603 1.3 L1 3.3 μH, 15 mΩ 1 Drum 124 LS Short 1 None 0 D1 10 A, 40 V 1 DI-5 27 J1 15-pin header 1 Header 96.8 Samtec HTSW-115-07-T-S Q1-1 0.080 Ω 1 1206-8 5 Siliconix Si5435BDC 1% tolerance Susumu RL1220T-R033-J 1% tolerance 1% tolerance Coilcraft DO3316P-332ML Shorted Diodes, Inc. PDS1040L Not populated C1, CIN2, CIN4, CF2, COUT2, CS, R1, RIN1, RCL3, RCL4, RS, L2, Q1-2, Q1-3, Q1-4, Q1-5 Table 2. ADP1864-BL-EVALZ Designator U1 Value Qty. 1 Package 6-lead TSOT Area (mm2) 9 J1 15-pin header 1 Header 96.8 ORDERING GUIDE Model ADP1864-EVALZ1 ADP1864-BL-EVALZ1 1 Manufacturer and Part Number Analog Devices ADP1864AUJZ-R7 Samtec HTSW-115-07-T-S ESD CAUTION Description Evaluation Board Blank Evaluation Board Z = RoHS Compliant Part. Rev. C | Page 14 of 16 Comments EVAL-ADP1864 NOTES Rev. C | Page 15 of 16 EVAL-ADP1864 NOTES ©2006–2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. EB05612-0-7/09(C) Rev. C | Page 16 of 16