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This user's guide describes the characteristics, operation, and use of the TPS79801DCQEVM-434
evaluation module (EVM). This EVM demonstrates the Texas Instruments TPS79801, a low-dropout linear
regulator in a SOT223-5 package that is capable of 50 mA of output current. This document includes
setup instructions, a schematic diagram, thermal guidelines, a bill of materials, and printed-circuit board
layout drawings for the EVM.
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SLUU346 - June 2009
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TPS79801DCQEVM-434
Contents
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List of Figures
List of Tables
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User's Guide
SLUU346 - June 2009
TPS79801DCQEVM-434
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Summary of Contents for Texas Instruments TPS79801DCQEVM-434
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Page 1: Table Of Contents
SLUU346 – June 2009 TPS79801DCQEVM-434 This user’s guide describes the characteristics, operation, and use of the TPS79801DCQEVM-434 evaluation module (EVM). This EVM demonstrates the Texas Instruments TPS79801, a low-dropout linear regulator in a SOT223-5 package that is capable of 50 mA of output current. This document includes setup instructions, a schematic diagram, thermal guidelines, a bill of materials, and printed-circuit board layout drawings for the EVM. -
Page 2: Introduction
Introduction www.ti.com Introduction The TPS79801DCQEVM-434 evaluation module (EVM) helps designers evaluate the operation and performance of the TPS79801 low-dropout (LDO) linear regulator in the SOT223-5 package. The TPS79801 is a 50-mA, micropower, linear regulator. Setup This section describes the jumpers and connectors on the EVM as well as how to properly connect, set up, and use the TPS79801EVM. -
Page 3: Operation
= 125°C, T = 42°C/W Using Equation 1, substitute the preceding given values, and find that the maximum power dissipation for the part is P = 0.952 W. 125°C = 85°C + P (42°C/W) SLUU346 – June 2009 TPS79801DCQEVM-434 Submit Documentation Feedback... -
Page 4: Board Layout
125°C. The answer depends on the output voltage. Output Voltage Maximum Input Voltage 59.6 52.6 50.9 50.1 Board Layout This section provides the TPS79801DCQEVM-434 board layout and illustrations. Figure 1. Top Layer Assembly TPS79801DCQEVM-434 SLUU346 – June 2009 Submit Documentation Feedback... -
Page 5: Top Layer Routing
Board Layout www.ti.com Figure 2. Top Layer Routing Figure 3. Bottom Layer Routing SLUU346 – June 2009 TPS79801DCQEVM-434 Submit Documentation Feedback... -
Page 6: Schematic And Bill Of Materials
Schematic and Bill of Materials www.ti.com Figure 4. Bottom Layer Assembly Schematic and Bill of Materials This section provides the TPS79801DCQEVM-434 schematic and bill of materials. Schematic Figure 5. TPS79801DCQEVM-434 Schematic TPS79801DCQEVM-434 SLUU346 – June 2009 Submit Documentation Feedback... -
Page 7: Bill Of Materials
Schematic and Bill of Materials www.ti.com Bill of Materials Table 2. TPS79801DCQEVM-434 Bill of Materials Count RefDes Value Description Size Part Number Open Capacitor, Ceramic 1206 0.22 µF Capacitor, Ceramic, 100V, X7R, 10% 0805 2.2 µF Capacitor, Ceramic, 50V, X7R, 10%... - Page 8 EVALUATION BOARD/KIT IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: 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 consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
- Page 9 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.
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