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User's Guide

SLVU369–April 2010

TPS62239EVM-574 User's Guide

This user's guide describes the characteristics, operation, and use of the TPS62239EVM-574 evaluation

module (EVM). This EVM demonstrates three individual configurations of the Texas Instruments

TPS6223x 3-MHz, synchronous step-down converter capable of supplying up to 500 mA of output current.

This user's guide includes setup instructions, a schematic diagram, a bill of materials, and printed-circuit

board layout drawings for the evaluation module.

Contents

1 Introduction .................................................................................................................. 2

2 Setup ......................................................................................................................... 2

3 Board Layout ................................................................................................................ 4

4 Schematic and Bill of Materials ........................................................................................... 6

5 Related Documentation From Texas Instruments ...................................................................... 8

List of Figures

1 Assembly Layer ............................................................................................................. 4

2 Top Layer Routing .......................................................................................................... 5

3 Bottom Layer Routing ...................................................................................................... 6

4 TPS62239EVM-574 Schematic ........................................................................................... 7

List of Tables

1 Device and Output Voltage Configurations.............................................................................. 2

2 Input and Output Connections ............................................................................................ 3

3 TPS62239EVM-574 Bill of Materials ..................................................................................... 7

SLVU369–April 2010 TPS62239EVM-574 User's Guide

Summary of content (10 pages)

PAGE 1
User's Guide SLVU369 – April 2010 TPS62239EVM-574 User's Guide This user's guide describes the characteristics, operation, and use of the TPS62239EVM-574 evaluation module (EVM). This EVM demonstrates three individual configurations of the Texas Instruments TPS6223x 3-MHz, synchronous step-down converter capable of supplying up to 500 mA of output current.
PAGE 2
Introduction 1 www.ti.com Introduction The Texas Instruments TPS62239EVM-574 evaluation module helps designers evaluate the operation and performance of the TPS6223x family of devices. These devices are high-efficiency, ultra-small size, buck converters that switch at up to 3 MHz. The EVM contains three independent dc/dc converters. Table 1 lists the default output voltages of the converters. Table 1.
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Setup www.ti.com 2.1.8 JP12, JP22, and JP32 – Mode This jumper is used to select the operating mode of the converter. The converter operates in a fixed-frequency, low-noise, PWM mode when a jumper is used to short the MODE pin to the ON pin. Shorting the MODE pin and OFF pin together allows the controller to use the power-saving (PFM) mode for high efficiency at low output currents. 2.2 Converter Configurations All converters are designed to use an input voltage between 2.05 V and 6 V.
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Board Layout 3 www.ti.com Board Layout This section provides the TPS62239EVM-574 board layout and illustrations. Board layout is critical for all high-frequency, switch-mode power supplies. Figure 1, Figure 2, and Figure 3 show the board layout for the TPS62239EVM-574 printed-circuit board. The nodes with high-switching frequencies and currents are kept as short as possible to minimize trace inductance.
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Board Layout www.ti.com Figure 2.
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Schematic and Bill of Materials www.ti.com Figure 3. Bottom Layer Routing 4 Schematic and Bill of Materials This section provides the TPS62239EVM-574 schematic and bill of materials.
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Schematic and Bill of Materials www.ti.com 4.1 Schematic Figure 4. TPS62239EVM-574 Schematic 4.2 Bill of Materials Table 3. TPS62239EVM-574 Bill of Materials Count -001 RefDes Value Description Size Part Number MFR 3 C11,C21,C31 2.2 mF Capacitor, Ceramic, 6.3 V, X5R, 20% 0402 JMK105BJ225MV-F CL05A225MQ5NNNC GRM155R60J225ME15D Taiyo Yuden Samsung Murata 3 C12,C22,C32 4.7 mF Capacitor, Ceramic, 6.
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Related Documentation From Texas Instruments 5 www.ti.com Related Documentation From Texas Instruments TPS622311, TPS62235, TPS62239, 3 MHz Ultra Small Step Down Converter in 1x1.
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FCC Warning This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general customer use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency interference.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.