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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. As such, the goods being provided are not intended to be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental
measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does
not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling
(WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.

Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from
the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER
AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge.

EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY
INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

TI currently deals with a variety of customers for products, and therefore our arrangement with the user

is not exclusive.

TI assumes

no liability for applications assistance, customer product design, software performance, or infringement of patents or

services described herein.

Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. This
notice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/or
safety programs, please contact the TI application engineer or visit

www.ti.com/esh

.

No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or
combination in which such TI products or services might be or are used.

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 consumer 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. Operation of this equipment in other environments may
cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may
be required to correct this interference.

EVM WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the input voltage range of 3 V to 80 V and the output voltage range of 1.25 V to 32 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.
Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.

During normal operation, some circuit components may have case temperatures greater than 85

°

C. The EVM is designed to operate

properly with certain components above 85

°

C as long as the input and output ranges are maintained. These components include but are

not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified
using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation,
please be aware that these devices may be very warm to the touch.

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265

Copyright © 2009, Texas Instruments Incorporated

Summary of Contents for TPS79801DCQEVM-434

Page 1: ...ted circuit board layout drawings for the EVM Contents 1 Introduction 2 2 Setup 2 2 1 Input Output Connector Descriptions 2 3 Operation 3 3 1 Operation 3 3 2 Fixed Output TPS798xx 3 4 Thermal Guidelines 3 4 1 Thermal Considerations 3 5 Board Layout 4 6 Schematic and Bill of Materials 6 6 1 Schematic 6 6 2 Bill of Materials 7 List of Figures 1 Top Layer Assembly 4 2 Top Layer Routing 5 3 Bottom Lay...

Page 2: ...sient response of the TPS79801 and helps to reduce ringing on the input when long supply wires are used This is the positive connection from the output Connect this pin to the positive input of the load This is the return connection for the input power supply of the regulator This is the return connection for the output This jumper is used to enable or disable the output of the TPS79801 Placing a ...

Page 3: ...sion the integrated circuit IC on the board needs to be changed to the desired fixed output voltage TPS798xx R1 must be shorted or removed from the EVM board and replaced with a 0 Ω resistor C5 must be removed and left open Jumpers must not be installed on J6 for fixed output voltage version parts This section provides guidelines for the thermal management of the TPS79801DCQEM 434 board Thermal ma...

Page 4: ...junction temperature Similar analysis can be performed to determine the maximum input voltage at room temperature 25 C to provide full output current while maintaining the junction temperature at or below 125 C The answer depends on the output voltage Output Voltage Maximum Input Voltage 12 59 6 5 52 6 3 3 50 9 2 5 50 1 This section provides the TPS79801DCQEVM 434 board layout and illustrations Fi...

Page 5: ...www ti com Board Layout Figure 2 Top Layer Routing Figure 3 Bottom Layer Routing SLUU346 June 2009 TPS79801DCQEVM 434 5 Submit Documentation Feedback ...

Page 6: ...matic and Bill of Materials www ti com Figure 4 Bottom Layer Assembly This section provides the TPS79801DCQEVM 434 schematic and bill of materials Figure 5 TPS79801DCQEVM 434 Schematic TPS79801DCQEVM 434 6 SLUU346 June 2009 Submit Documentation Feedback ...

Page 7: ... STD Any 1 R2 23 2K Resistor Chip 1 16W 1 0603 STD Any 1 R3 66 5K Resistor Chip 1 16W 1 0603 STD Any 1 R4 124K Resistor Chip 1 16W 1 0603 STD Any 1 R5 205K Resistor Chip 1 16W 1 0603 STD Any 1 U1 TPS79801DCQ IC LDO Micropower Linear Regulator 3V 80V 50 mA SOT223 5 TPS79801DCQ TI 2 Shunt 100 mil Black 0 100 3M 929950 00 1 PCB 1 60 In 1 500 In 0 062 In HPA334 Any Notes 1 These assemblies are ESD sen...

Page 8: ...oduct This notice contains important safety information about temperatures and voltages For additional information on TI s environmental and or safety programs please contact the TI application engineer or visit www ti com esh No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine process or combination in which such TI products ...

Page 9: ...ice TI is not responsible or liable for any such statements TI products are not authorized for use in safety critical applications such as life support where a failure of the TI product would reasonably be expected to cause severe personal injury or death unless officers of the parties have executed an agreement specifically governing such use Buyers represent that they have all necessary expertis...

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