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User's Guide

SLVU292A–April 2010–Revised April 2010

TPS6261x/TPS6262x/TPS6266xEVM

This user’s guide describes the characteristics, operation, and use of the TPS6261x/2x/6xEVM-419

evaluation module (EVM). The TPS626xxEVM-419 is a fully assembled and tested platform for evaluating

the performance of the TPS6261x/2x/6x high-frequency, synchronous, step-down dc-dc converters

optimized for battery-powered portable applications. This document includes schematic diagrams, a

printed circuit board (PCB) layout, bill of materials, and test data. Throughout this document, the

abbreviations EVM, TPS626xxEVM, TPS6261x/2x/6xEVM, and the term evaluation module are

synonymous with the TPS6261x/2x/6xEVM-419 unless otherwise noted.

Contents

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

1.1 Features ............................................................................................................. 2

1.2 Applications ......................................................................................................... 2

1.3 EVM Ordering Options ............................................................................................ 2

2 TPS6261x/2x/6xEVM Electrical Performance Specifications ......................................................... 3

3 TPS626xxEVM Schematic ................................................................................................. 3

4 Connector and Test Point Descriptions .................................................................................. 4

4.1 Input / Output Connectors: TPS626xxEVM ..................................................................... 4

4.2 Jumpers and Switches ............................................................................................ 4

5 Test Configuration .......................................................................................................... 5

5.1 Hardware Setup .................................................................................................... 5

5.2 Procedure ........................................................................................................... 5

6 TPS626xxEVM Test Data .................................................................................................. 6

6.1 Efficiency ............................................................................................................ 6

6.2 Start-Up ............................................................................................................. 8

6.3 Output Voltage Ripple (Power-Save Mode) .................................................................... 9

6.4 Output Voltage Ripple (PWM) .................................................................................... 9

7 TPS626xxEVM Assembly Drawings and Layout ...................................................................... 10

8 Bill of Materials ............................................................................................................. 13

9 Marking Information ....................................................................................................... 13

List of Figures

1 TPS626xxEVM Schematic................................................................................................. 3

2 Hardware Board Connection .............................................................................................. 5

3 TPS6262xEVM Efficiency versus Load Current (VIN = 2.7 V)........................................................ 6

4 TPS6262x and TPS6262xEVM Efficiency versus Load Current (VIN = 3.6 V) ..................................... 6

5 TPS6261xEVM Efficiency versus Load Current (V

OUT

= 1.8 V) ....................................................... 6

6 TPS6261xEVM Efficiency versus Load Current (V

OUT

= 1.2 V) ....................................................... 6

7 TPS6266xEVM Efficiency versus Load Current (V

OUT

= 1.8 V) ....................................................... 6

8 TPS6266xEVM Efficiency versus Load Current (V

OUT

= 1.2 V) ....................................................... 6

9 TPS62660EVM Startup .................................................................................................... 8

10 TPS62620EVM Start-Up ................................................................................................... 8

11 TPS6261xEVM Start-Up ................................................................................................... 8

12 Power-Save Mode Ripple.................................................................................................. 9

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SLVU292A–April 2010–Revised April 2010 TPS6261x/TPS6262x/TPS6266xEVM

Summary of content (15 pages)

PAGE 1
User's Guide SLVU292A – April 2010 – Revised April 2010 TPS6261x/TPS6262x/TPS6266xEVM This user’s guide describes the characteristics, operation, and use of the TPS6261x/2x/6xEVM-419 evaluation module (EVM). The TPS626xxEVM-419 is a fully assembled and tested platform for evaluating the performance of the TPS6261x/2x/6x high-frequency, synchronous, step-down dc-dc converters optimized for battery-powered portable applications.
PAGE 2
Introduction 13 14 15 16 1 www.ti.com ........................................................................................................ TPS626xxEVM Component Placement (Top View) .................................................................. TPS626xxEVM Top-Side Copper (Top View) ......................................................................... TPS626xxEVM Bottom-Side Copper (Bottom View)..................................................................
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TPS6261x/2x/6xEVM Electrical Performance Specifications www.ti.com 2 TPS6261x/2x/6xEVM Electrical Performance Specifications Table 2 summarizes the TPS6261x/2x/6xEVM-419 performance specifications. Table 2. TPS6261x/2x/6xEVM Performance Characteristics Parameter Notes and Conditions Min Typ Max Unit 5.5 V INPUT CHARACTERISTICS VIN Input voltage VIN_UVLO Input UVLO IQ 2.2 Operating quiescent current 2.05 2.1 V IO = 0 mA, device not switching 31 55 µA IO = 0 mA, PWM mode 7.
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Connector and Test Point Descriptions www.ti.com 4 Connector and Test Point Descriptions 4.1 Input / Output Connectors: TPS626xxEVM 4.1.1 J1 VIN This header is the positive connection to the input power supply. The power supply must be connected between J1 and J3 (GND). The leads to the input supply should be twisted and kept as short as possible. The input voltage must be between 2.3 V and 5.5 V. 4.1.2 J2 S+/S– J2 S+/S– are the sense connection for the input of the converter.
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Test Configuration www.ti.com 5 Test Configuration 5.1 Hardware Setup Figure 2 illustrates a typical hardware test configuration. J2 S+ TPS6261x/2x/6xEVM-419 S+ VIN S- GND EN ON JP1 OFF Load J6 J1 S- J5 - VOUT GND J4 + DC Power Supply J3 Oscilloscope MODE PWM PWM JP2 Figure 2. Hardware Board Connection 5.2 Procedure Follow these procedures when configuring the EVM for testing.
PAGE 6
TPS626xxEVM Test Data 6 www.ti.com TPS626xxEVM Test Data Figure 5 through Figure 11 present typical performance graphs for the TPS626xxEVM. Actual performance data can be affected by measurement techniques and environmental variables; therefore, these curves are presented for reference and may differ from actual results obtained by some users. 6.1 Efficiency Figure 3 through Figure 8 show the typical efficiency performance for the TPS626xxEVM. 100 VI = 2.7 V PFM/PWM Operation VO = 1.
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TPS626xxEVM Test Data www.ti.com 100 90 100 VO = 1.8 V (TPS62660) 80 80 VI = 3.6 V PFM/PWM Operation 60 50 VI = 4.2 V PFM/PWM Operation VI = 2.7 V PFM/PWM Operation 40 VI = 3.6 V Forced PWM Operation 30 60 50 30 20 10 10 0 1 10 100 IO - Load Current - mA VI = 4.2 V PFM/PWM Operation 40 20 0.1 VI = 3.6 V PFM/PWM Operation 70 Efficiency - % Efficiency - % 70 VI = 2.7 V PFM/PWM Operation VO = 1.2 V 90 1000 Figure 7. TPS6266xEVM Efficiency versus Load Current (VOUT = 1.8 V) 0 0.
PAGE 8
TPS626xxEVM Test Data 6.2 www.ti.com Start-Up EN - 2 V/div IL - 200 mA/div IL - 200 mA/div VI = 3.6 V, VO = 1.82 V (TPS62620), IO = 0 mA VO - 1 V/div VI = 3.6 V, VO = 1.8 V (TPS62660), IO = 0 mA VO - 1 V/div EN - 2 V/div Figure 9 through Figure 11 show the typical start-up performance for different TPS626xxEVM boards. MODE = Low MODE = Low t - Time - 20 µs/div t - Time - 20 µs/div EN - 2 V/div Figure 9. TPS62660EVM Startup Figure 10.
PAGE 9
TPS626xxEVM Test Data www.ti.com 6.3 Output Voltage Ripple (Power-Save Mode) VI = 3.6 V, VO = 1.8 V, IO = 40 mA SW Node - 2 V/div IL - 200 mA/div VO - 10 mV/div - 1.8 V Offset Figure 12 illustrates the typical output voltage ripple for the TPS626xx in power-save mode. MODE = Low t - Time - 250 ns/div Figure 12. Power-Save Mode Ripple 6.4 Output Voltage Ripple (PWM) IL - 200 mA/div VI = 3.6 V, VO = 1.8 V, IO = 150 mA SW Node - 2 V/div VO - 10 mV/div - 1.
PAGE 10
TPS626xxEVM Assembly Drawings and Layout 7 www.ti.com TPS626xxEVM Assembly Drawings and Layout Figure 14 through Figure 16 show the design of the show the design of the TPS6261x/2x/6xEVM-419 printed circuit boards. The EVM has been designed using a two-layer, 1-ounce copper-clad PCB with all components in an active area on the top side of the board. Moving components to both sides of the PCB or using additional internal layers can offer additional size reduction for space-constrained systems.
PAGE 11
TPS626xxEVM Assembly Drawings and Layout www.ti.com Figure 15.
PAGE 12
TPS626xxEVM Assembly Drawings and Layout www.ti.com Figure 16.
PAGE 13
Bill of Materials www.ti.com 8 Bill of Materials Table 3 lists the bill of materials for the TPS626xxEVM. Table 3. TPS626xxEVM-419 Bill of Materials EVM Device Option: Count -001 9 -002 -003 -004 -005 -006 RefDes Value Description Size Part Number 6032 6TPE150MIC2 1 1 1 1 1 1 C1 150 µF Capacitor, Tantalum, 6.3 V, 18 mΩ, 20% 2 2 2 2 2 2 C2, C3* 4.7 µF Capacitor, Ceramic, 6.3V, X5R, 20% 0402 GRM155R60J475ME87 2012 LQM21PN1R0MC0 0 0 0 0 1 0 L1 1.
PAGE 14
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 15
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.