Application Note 1611 ISL8033EVAL2Z Dual 3A Low Quiescent Current, High Efficiency, Synchronous Buck Regulator Description Recommended Equipment The ISL8033EVAL2Z kit is intended for use by individuals with requirements for Point-of-Load applications sourcing from 2.85V to 6V. The ISL8033EVAL2Z evaluation board is used to demonstrate the performance of the ISL8033 low quiescent current mode converter. The following materials are recommended to perform testing: The ISL8033 is offered in a 4mmx4mm 24 Ld QFN package with 1mm maximum height. The complete converter occupies less than 0.229in2. • 0V to 10V Power Supply with at Least 3A Source Current Capability or 5V Battery • Electronic Loads Capable of Sinking Current up to 3A • Digital Multimeters (DMMs) • 100MHz Quad-Trace Oscilloscope • Signal Generator Key Features Quick Setup Guide • Dual 3A High Efficiency Synchronous Buck Regulator with up to 95% Efficiency • Power-Goods (PG) Output with 1.5ms Delay • 2.85V to 6V Supply Voltage • 2% Output Accuracy Over-temperature/Load/Line • Start-up with Pre-biased Output • External Synchronization up to 6MHz • Typical 8µA Logic Controlled Shutdown Current • 100% Maximum Duty Cycle for Lowest Dropout • Internal Current Mode Compensation • Peak Current Limiting, Hiccup Mode Short Circuit Protection and Over-temperature Protection • Negative Current Detection and Protection • Adjustable Peak Overload Current 1. Ensure that the circuit is correctly connected to the supply and loads prior to applying any power. 2. Connect the bias supply to VIN, the plus terminal to VIN and the negative return to P1. 3. Turn on the power supply. 4. Verify the output voltage is 1.8V for VOUT1 and 1.8V for VOUT2. Bill of Materials REFERENCE DESIGNATOR DESCRIPTION MFR MFR PART PWB-PCB, ISL8033EVAL2Z, REVA, ROHS LIANCHUANG ISL8033EVAL2ZREVAPCB CAP, SMD, 0805, 22µF, 6.3V, 20%, X5R, ROHS TDK C2012X5R0J226M CAP, SMD, 0402, 47pF, 50V, 5%, NPO, ROHS MURATA GRM36COG470J050AQ L1, L2 COIL-PWR INDUCTOR, SMD, 4mm 1.5µH, 20%, 4.1A, 14.4mΩ, ROHS COILCRAFT XFL4020-152MEC U1 IC-DUAL 3A BUCK REGULATOR, 24P, QFN, 4X4, ROHS INTERSIL ISL8033IRZ R2 RES, SMD, 0402, 0Ω, 1/16W, 5%, TF, ROHS VENKEL CR0402-16W-00T RF11, RF21 RES, SMD, 0402, 100k, 1/16W, 1%, TF, ROHS PANASONIC ERJ2RKF1003 RF12, RF22 RES, SMD, 0402, 124k, 1/16W, 1%, TF, ROHS PANASONIC ERJ-2RKF1243X C3, C4, C9, C11, CIN1, CIN2 C5, C10 R1 October 27, 2010 AN1611.0 RES, SMD, 0402, DNP, TF, ROHS 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. 2010. All Rights Reserved All other trademarks mentioned are the property of their respective owners. Application Note 1611 FIGURE 1. ISL8033EVAL2Z SCHEMATIC FIGURE 2. TOP COMPONENTS FIGURE 3. BOTTOM SILK SCREEN 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 2 AN1611.0