Application Note 1564 ISL9305/ISL9305H Evaluation Board User Guide Evaluation Board Features • Input voltage rating from 2.3V to 5.5V for ISL9305 and 2.5V to 5.5V for ISL9305H • Two 800mA buck converters for ISL9305 and two 1.5A buck converters for ISL9305H • Two 300mA LDOs • Output voltages are programmable with I2C DEFAULT START-UP NO LOAD VODCD1 VODCD2 LDO1 • 3MHz switching frequency • Connector, test point and Jumper LDO2 Required Equipment • Power supply capable of delivering up to 5.5V and 3A • Electronic load • Voltmeter, Oscilloscope Quick Setup Guide FIGURE 1. START-UP SEQUENCE 1. Install jumpers on JP3, JP4, JP8 and JP9. 2. Connect power supply to VCC, with voltage setting within voltage rating. 3. Connect electronic loads at VODCD1, VODCD2, with load setting up to 800mA for ISL9305, and 1.5A for ISL9305H. 4. Connect electronic loads at VOLDO1, VOLDO2, with current setting up to 300mA. 5. Place scope probes at 4 outputs. 6. Turn on the power supply. 7. Monitor output voltages start-up sequence in default on the scope. The waveforms will look similar to that shown in Figure 1. 8. Turn on the electronic loads at all outputs. 9. Measure the output voltages with voltmeter. The voltages should regulate within the data sheet spec limit. June 4, 2012 AN1564.1 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. Copyright Intersil Americas Inc. 2010, 2012. All Rights Reserved. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. Application Note 1564 TABLE 1. DESCRIPTION OF CONNECTOR AND TEST POINT TEST POINT(S) DESCRIPTION P1, P3 VCC (Power supply input for the evaluation board) P2, P4 GND (Ground) P5 P6, P8 GND (Ground) VODCD2 (Output of DCD2 buck converter) P9 VINDCD1 (Input of DCD1 and IC internal logic and analog circuits. DCD2, LDO1 and LDO2 will not operate if VINDCD1 is open) P11 P15, P17 VINDCD2 (input of DCD2) JP1 Connecting points for connecting a load between VODCD1 to ground. JP2 Connecting points for connecting a load between VODCD2 to ground. JP3 Jumper installed to short VINDCD1 to VCC as input supply for DCD1. JP4 Jumper installed to short VINDCD2 to VCC as input supply for DCD2. JP5 Jumper installed to connect VODCD1 to FB1 pin, allowing user to program VODCD1 with the internal feedback network. JP6 Jumper installed to connect VODCD2 to FB2 pin, allowing user to program VODCD2 with the internal feedback network. JP8 Jumper installed to short VINLDO1 to VCC as input supply for LDO1. JP9 Jumper installed to short VINLDO2 to VCC as input supply for LDO2. JP10 Connecting points for connecting a load between VOLDO1 to ground. JP11 Connecting points for connecting a load between VOLDO2 to ground. GND (Ground) PG (Power-good signal output) P14 VINLDO1 (Input of LDO1) P16 VINLDO2 (Input of LDO2) P18 VOLDO1 (Output of LDO1) P20 VOLDO2 (Output of LDO2) JP7 DESCRIPTION GND (Ground) P13 P19, P20 JUMPER VODCD1 (Output of DCD1 buck converter) P7 P10, P12 TABLE 2. DESCRIPTION OF JUMPERS GND (Ground) 4 pin header (connector to connect I2C interface board to the EVB) Evaluation Software Installation and Use 1. Check your system specs against the system requirements listed in the following. • Windows 98SE, Windows XP, or Windows NT • CDROM drive • USB port • At least 20MB free hard disk space • 1024x768 or larger resolution monitor 2. Install the driver for the ISLUSB2I2C interface by double clicking on the file named “usb2i2c_Installer.exe” on the ISL9305/ISL9305H eval kit CDROM. Follow the instructions that appear on-screen to install the driver. 3. Install the ISL9305 evaluation software by double clicking on the file named: “ISL9305_Eval_Installer.exe” on the ISL9305 eval kit CDROM. Follow the instructions that appear on-screen to install the application. This software is applicable to the ISL9305H evalution kit as well. 4. Attach the ISLUSB2ISC interface to the computer using the supplied USB cable. The ‘Found New Hardware” dialog will appear. Select “Install the software automatically” and click “Next”. 5. Locate the 4-wire I2C cable that is provided with the ISLUSBI2C kit. Attach one end of this cable to the 4-pin header on the ISLUSBI2C interface, and connect the other end of this cable to the corresponding 4-pin header on the ISL9305 eval board. 2 June 4, 2012 AN1564.1 Application Note 1564 6. Following the Quick Setup Guide on page 1 of this document, connect power supply, DC load, and other test equipment to the ISL9305/ISL9305H evaluation board, then apply power. 7. Launch the ISL9305 eval software. The installer adds a shortcut in the Start menu: Start > Programs > Intersil > ISL9305 > ISL9305 Eval. Select this item to launch the evaluation software. 8. When launched, the ISL9305 eval software detects the ISLUSBI2C interface. At the bottom of the ISL9305 application window is a Log textbox. The message in this textbox should report: “UB-to-I2C driver initialization successful” and “USB-to-I2C interface detected”, indicating successful connection between the device and the eval software. If this message is not displayed, please check connections and try reinstalling the ISLUSBI2C driver. 9. Check if the “Enable I2C Functions” box under SYS Control section is checked. 10. Try reading the ISL9305/ISL9305H device registers by clicking on the READ buttons. Observe the activity reported in the Log textbox. Successful I2C communication will be reported in this textbox. If there is a communication error, this will also be reported in the Log text box. 11. Also try changing the DCD or LDO voltages to a different value using the up/down arrow buttons next to that text box. The WRITE button for that register should get highlighted. Click on the WRITE button. This will update the register with the new control bits and the output voltage should change. 12. Refer to the ISL9305/ISL9305H datasheet for description of the registers and control bits provided in the ISL9305, ISL9305H. FIGURE 2. ISL9305/ISL9305H EVALUATION SOFTWARE MAIN SCREEN 3 June 4, 2012 AN1564.1 Application Note 1564 NOTE: CHANGE C7 AND C8 TO 10µF FOR ISL9305H - 1.5A VERSION FIGURE 3. ISL9305/ISL9305H EVALUATION BOARD SCHEMATIC 4 June 4, 2012 AN1564.1 Application Note 1564 Evaluation Board Layout FIGURE 4. ISL9305 EVALUATION BOARD SILKSCEEN TOP (SIMILAR to ISL9305H) FIGURE 5. ISL9305/ISL9305H TOP COPPER 5 June 4, 2012 AN1564.1 Application Note 1564 Evaluation Board Layout (Continued) FIGURE 6. ISL9305/ISL9305H MIDLAYER 1 (AGND) FIGURE 7. ISL9305/ISL9305H MIDLAYER 2 (VCC) 6 June 4, 2012 AN1564.1 Application Note 1564 Evaluation Board Layout (Continued) FIGURE 8. ISL9305/ISL9305H BOTTOM LAYER (PGND) TABLE 3. ISL9305 EVALUATION BOARD BILL OF MATERIALS ITEM# QTY DESIGNATOR PART TYPE FOOTPRINT 1 1 U1 ISL9305/ISL9305H L16.4x4 TQFN DESCRIPTION VENDORS 2 2 L1, L2 1.5µH 3x3x1.55 3 2 C1, C2 10µF/10V/X7R 4 2 C1A, C2A 5 4 C3 - C6 1µF/16V/X7R 6 2 C7, C8 7 2 C7A, 8A 8 2 C9, C11 Generic 603 Capacitor, 10V rating is OK 9 2 C10, C12 47PF/50V 603 C1608C0G1H470J TDK 10 2 C13, C14 0.1µF/50V 603 GRM188R71H104KA93D MURATA 11 5 R1, R2, R5, R6, R7 100kΩ, 1%, SMD 603 CR0603-16W-1003FT VENKEL 12 2 R3, R4 10kΩ, 1%, SMD 603 RHM10.0KHTR-ND Rohm 13 4 TP1 - TP4 SW1 TEST POINT Digikey 5000K-ND 14 4 JP1, JP2, JP10, JP11 Jumper-2 pin Jumper-2 pin ED7336-ND 15 4 JP3 - JP6, JP8, JP9 Jumper-2 pin Jumper-2 pin 538-22-28-4360 Intersil ISL9305 INTERSIL CDRH2D14NP-1R5NC SUMIDA 805 GRM21BR71A106KE51L MURATA 805 Do Not Populate 805 C2012X7R1C105K TDK 4.7µF/16V/X7R 805 GRM21BR71C475KA73L MURATA (Place holder) 805 Capacitor, 10V rating is OK 16 1 JP7 CON4 Header 4x1 17 21 P1 - P21 GOLD PIN POWERPOST MOLEX 640456-4 TYCO 3156-1-00-15-00-00-08-0 Mill-max NOTE: Change C7 and C8 to 10µF for ISL9305H (1.5A version). Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding. For information regarding Intersil Corporation and its products, see www.intersil.com 7 June 4, 2012 AN1564.1