TPS62220EVMĆ014, TPS62221EVMĆ014 User’s Guide January 2004 PMP Portable Power SLVU092
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.
EVM IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use.
EVM WARNINGS AND RESTRICTIONS It is important to operate this EVM within the input voltage range of 2.5 V to 6 V. Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power. Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM.
How to Use This Manual Preface About This Manual This users guide describes the characteristics, operation, and use of the TPS62220EVM-014 and TPS62221EVM-014 evaluation modules (EVM). These EVMs contain Texas Instruments high-efficiency buck converters that are configured to provide a regulated 1.8-V and 1.5-V output voltage and up to 400 mA of current. The users guide includes a schematic diagram, bill of materials (BOM), and test data.
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Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Performance Specification Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 Modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contents 2−1 3−1 3−2 3−3 4−1 TPS62220 Efficiency With CDRH2D18/HP-4.7 µH Inductor . . . . . . . . . . . . . . . . . . . . . . . . . Top Assembly Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Top Layer Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bottom Layer Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1 This chapter contains background information for the TPS62220EVM−014 and TPS62221EVM−014 evaluation modules. Topic Page 1.1 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.2 Performance Specification Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.3 Modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Background 1.1 Background This TPS6222xEVM uses a TPS6222X buck converter to step down 2.5-V or higher input voltages. This EVM operates over an input voltage range of 2.5 V to 6 V. The goal of the EVM is to demonstrate the small size of the TPS6220X power supply solution and provide flexibility in interchanging the supporting passive components. The TPS62221EVM uses a TPS62221 fixed 1.5-V output buck converter.
Chapter 2 This chapter describes how to properly connect, setup, and use the TPS6222xEVM. Topic Page 2.1 Input/Output Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2.2 EVM Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2.3 Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input/Output Connections 2.1 Input/Output Connections The connection points are described in the following paragraphs. 2.1.1 J1−Vin This is the positive connection to the input power supply. The leads to the input supply should be twisted and kept as short as possible. 2.1.2 J2−GND This is the return connection to the input power supply. 2.1.3 JP1−Enable This is the enable pin of the device. The enable pin is pulled up to Vin by an onboard pullup resistor.
Test Results 2.3 Test Results Below are the test results using this EVM. Figure 2−1. TPS62220 Efficiency With CDRH2D18/HP−4.7-mH Inductor EFFICIENCY vs OUTPUT CURRENT 100 VIN = 2.5 V Efficiency − % 90 VIN = 3.6 V 80 VIN = 5 V 70 VO = 1.
Chapter 3 This chapter provides the TPS6222xEVM board layout and illustrations. Topic 3.1 Page Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Layout 3.1 Layout Board layout is critical for all switch mode power supplies. Figures 3−1, 3−2, and 3−3 show the board layout for the HPA014 PWB. The switching nodes with high frequency noise are isolated from the noise sensitive feedback circuitry and careful attention has been given to the routing of high frequency current loops. Refer to the data sheet for specific layout guidelines. Figure 3−1. Top Assembly Layer Figure 3−2. Top Layer Routing Figure 3−3.
Chapter 4 This chapter provides the TPS6222xEVM-014 bill of materials and schematics. Topic Page 4.1 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 4.2 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bill of Materials 4.1 Bill of Materials Table 4−1. Bill of Materials ’20 ’21 RefDes 1 1 C1 Capacitor, ceramic, 4.7 µF, 6.3 V, X5R, ±20% 603 TDK C1608X5R0J475M C2 Capacitor, ceramic, 10 µF, 6.3 V, X5R, 20% 805 TDK C2012X5R0J106M Capacitor, ceramic, 22 µF, 6.
Schematic 4.2 Schematic Figure 4−1. TPS6222x Schematic J1 VIN 1 1 2 C5 2 J2 GND 1 1 5 1 VIN SW 2 GND 4 3 FB EN L1 4.7 µH J3 R1 C3 1 1 R2 2 JP1 EN C1 4.
