ISL97656IRTZEVALZ Evaluation Board Application Manual ® Application Note Description May 10, 2010 AN1473.1 Quick Setup Guide The ISL97656IRTZEVALZ is an evaluation kit for evaluating the ISL97656, a step-up voltage regulator that operates with high frequency and high efficiency. This evaluation kit is designed to deliver up to 2A output current for portable equipment and TFT-LCD display. The ISL97656IRTZEVALZ evaluation kit provides a dip switch that allows users to select either 620kHz or 1.2MHz frequency. 1. Connect power supply between headers of VIN and VIN_GND. The positive output of the power supply should be connected to VIN header. Set power supply voltage between 2.3V and 5V, and current limit at 4A. 2. Connect E-load between headers of VOUT and OUT_GND. The positive input of the E-load should be connected to VOUT header. Set E-load current. The load current should not exceed the maximum output current in Table 1. 3. Close pins 1 and 4 of S1 to tie FREQ pin to VIN to set 1.25MHz switching frequency. Open pins 1 and 4 to pull FREQ to ground with R4 to set 620kHz. Key Features • A Complete Evaluation Platform for the ISL97656 Evaluation 4. Close pins 2 and 3 of S1 to tie EN pin to VIN to enable the part. Open pins 2 and 3 to pull EN to ground with R3 to disable the part. • Input Voltage: 2.3V to 5.5V • Proven Evaluation Board Layout 5. Make sure all the connections on the evaluation board are correct, then turn on power supply and E-load. The part starts to operate. • Pb-Free (RoHS Compliant) What is Needed The following instruments will be needed to perform testing: • Power Supplies • DC Electronic Load • Multimeters Maximum Output Current The MOSFET current limit is normally 4A and guaranteed 3.8A. This restricts the maximum output current that the ISL97656 can drive.Table 1 shows typical maximum IOUT values for 1.2MHz switching frequency and 10µH inductor. TABLE 1. TYPICAL MAXIMUM IOUT VALUES • Oscilloscope • Cables and Wires VIN (V) VOUT (V) IOMAX (mA) Pinout 2.5 5 1790 2.5 9 990 2.5 12 750 3.3 5 2370 3.3 9 1300 ISL97656 (10L ΜTDFN) TOP VIEW COMP 1 10 SS 3.3 12 970 FB 2 9 FREQ 5 9 1970 EN 3 8 IN 5 12 1470 GND 4 7 LX GND 5 6 LX Ordering Information PART NUMBER DESCRIPTION ISL97656IRTZEVALZ Evaluation Board for ISL97656 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2009, 2010. All Rights Reserved All other trademarks mentioned are the property of their respective owners. Application Note 1473 Board Design Schematic R4 10k S1 1 2 4 3 R5 SW DIP-2 10k 4700pF C6 1k R3 COMP 2 10k R2 C4 27nF ISL97656 1 3 R1 88.7k 4 5 VOUT (12V) SS FB FREQ EN IN GND LX GND LX ISL97656 10 C2 0.1µF 9 1 C1 22µF 7 GNDIN C3 22µF C7 CAP CON1 6 D1 L1 1 CON1 VIN (2.3V to 5.5V) 8 10µH FY0504SA 1 CON1 NOTE: The thermal pad should connect to signal ground. Both grounds should connect at pins 4 and 5. FIGURE 1. SCHEMATIC TABLE 2. ISL97656IRTZEVALZ BILL OF MATERIALS (BOM) ITEM QTY REFERENCE PART DESCRIPTION PCB FOOTPRINT PART NUMBER 1 1 C4 27nF 603 TDK 2 1 C6 4700pF 603 TDK 3 1 C2 0.1µF/16V 603 4 1 R1 88.7k 603 5 3 R2, R4, R5 10k 603 6 1 R3 1k 603 8 1 C3 22µF 9 1 C1 10 1 11 C1068X7R1H104K VENDOR TDK WALSIN WR06W1002JTL WALSIN 1206 GRM31CR61C226KE15L MURATA 22µF 1206 GRM31CR61C226KE15L MURATA L1 10µH SLF12575 SLF12575T-100M5R4-PF TDK 1 U1 IC TDFN-10 ISL97656 INTERSIL 12 OPEN C7 CAP 13 1 VOUT (12V) CON1 Powerpost 14 1 VIN (2.3V to 5.5V) CON1 Powerpost 15 1 GNDIN CON1 Powerpost 16 1 D1 FYD054SA DPAK FYD0504SATM Fairchild 17 1 ISL97656 ISL97656 TDFN-10 18 1 S1 SW DIP-2 DIP4 2 INTERSIL CKN3001-ND AN1473.1 May 10, 2010 Application Note 1473 PCB Layout FIGURE 1. EVALUATION BOARD ASSEMBLY LAYER FIGURE 2. TOP LAYER 3 AN1473.1 May 10, 2010 Application Note 1473 PCB Layout (Continued) FIGURE 3. BOTTOM LAYER 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 4 AN1473.1 May 10, 2010