Texas Instruments TPS211 AEVM Series User manual


   
April 2004
User’s Guide
SBVU007

IMPORTANT NOTICE
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Mailing Address: Texas Instruments
Post Office Box 655303 Dallas, Texas 75265
Copyright 2004, Texas Instruments Incorporated

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. As such, the goods being provided
may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective
considerations, including product safety measures typically found in the end product incorporating the goods.
As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic
compatibility and therefore may not meet the technical requirements of the directive.
Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the 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. Please be aware that the products
received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). 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 EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM
User’s Guide prior to handling the product. This notice contains important safety information about temperatures
and voltages. For further safety concerns, please contact the TI application engineer.
Persons handling the product must have electronics training and observe good laboratory practice standards.
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.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2004, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 2.8 V and 5.5 V, and the
output voltage range of 2.8 V and 5.5 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
60°C. The EVM is designed to operate properly with certain components above 60°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 2004, Texas Instruments Incorporated

Trademarks
v
Preface

About This Manual
This user’s guide describes the TPS211xA evaluation module (EVM). This
guide contains the EVM schematic, bill of materials, assembly drawing, and
top and bottom layer printed circuit board layouts.
How to Use This Manual
This document contains the following chapters:
-Chapter 1 − Introduction
-Chapter 2 − EVM Setup
-Chapter 3 − Schematic and Bill of Materials
-Chapter 4 − Board Layout
The information in a caution or a warning is provided for your protection.
Please read each caution and warning carefully.
Related Documentation From Texas Instruments
Data Sheet: Literature Number:
TPS2110/1A: Autoswitching Power Mux SBVS043
TPS2112/3A: Autoswitching Power Mux SBVS045
TPS2114/5A: Autoswitching Power Mux SBVS044
Trademarks
All trademarks are the property of their respective owners.

Trademarks
vi
Electrostatic Sensitive Devices
This EVM contains components that can potentially be damaged by
electrostatic discharge. Always transport and store the EVM in its
supplied ESD bag when not in use. Handle using an antistatic
wristband. Operate on an antistatic work surface. For more
information on proper handling, refer to SSYA008.

Contents
vii

1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 EVM Setup 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Setting Up the EVM 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Current-Limit Adjustment 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Manual Switching Mode (TPS2110/1/4/5A Only) 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.1 Configuring the TPS2110/1A for Manual Switching 2-3. . . . . . . . . . . . . . . . . . . . . . .
2.3.2 Configuring the TPS2114/5A for Manual Switching 2-3. . . . . . . . . . . . . . . . . . . . . . .
2.4 Automatic Switching Modes 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.1 Mode 1 Automatic Switching 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.2 Mode 2 Automatic Switching (TPS2110/1/2/3A Only) 2-4. . . . . . . . . . . . . . . . . . . . .
2.5 Output Voltage Holdup 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6 Switch Status (TPS2112/3/4/5A Only) 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Schematic and Bill of Materials 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 EVM Configurations 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Schematic 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Bill of Materials 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Board Layout 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Layout Considerations 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
viii

2−1 Basic EVM Setup 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3−1 TPS211xAEVM Schematic 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4−1 Component Placement 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4−2 Top-Side Layout 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4−3 Bottom-Side Layout 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2−1 EVM Shorting Jumper Placement for Mode 1 Automatic Switching 2-3. . . . . . . . . . . . . . . . . .
2−2 EVM Shorting Jumper Placement for Mode 2 Automatic Switching 2-4. . . . . . . . . . . . . . . . . .
3−1 Available EVM Configurations 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3−2 HPA061 Bill of Materials 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1
Introduction

The TPS211xA EVM is an evaluation module for the Texas Instruments
TPS211xA family of two-input, one-output power multiplexers. These
multiplexers enable seamless transition between two power supplies, each
operating at 2.8 V–5.5 V and delivering up to 1 A. EVM configurations are
available for the TPS2110A through TPS2115A. Refer to Table 3−1, the
schematic, and the bill of materials in this user’s guide to distinguish between
these configurations.
The EVM has test points for convenient access to all critical node voltages,
potentiometers for adjusting the current limit and the auto-switching voltage
sense thresholds, headers for selecting the manual/auto-switching operating
modes, and headers for selecting the output hold-up capacitance.
Chapter 1

1-2

2-1
EVM Setup
 
This chapter describes the proper setup of the TPS211xAEVM for use in
device evaluations.
Topic Page
2.1 Setting Up the EVM 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Current-Limit Adjustment 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Manual Switching Mode (TPS2110/1/4/5A Only) 2-2. . . . . . . . . . . . . . . . . .
2.4 Automatic Switching Modes 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 Output Voltage Holdup 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6 Switch Status (TPS2112/3/4/5A Only) 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2

Setting Up the EVM
2-2
2.1 Setting Up the EVM
The user is encouraged to read the applicable TPS211xA data sheet before
using the EVM.
The following test equipment is recommended:
-Storage oscilloscope
-Current probe
-Two adjustable power supplies, 0 V – 6 V @ 2−A
-Volt−Ohm meter
-A passive or active load
Figure 2−1 shows the EVM test configuration.
Figure 2−1.Basic EVM Setup
V1
V2
RL
V1
V2
2.2 Current-Limit Adjustment
Potentiometer R4 controls the resistance RILIM that sets the TPS211xA current
limit threshold. Adjusting R4 clockwise increases the current limit threshold by
decreasing RILIM. The current limit threshold is 250/RILIM for the TPS2110A,
TPS2112A, and TPS2114A and 500/RILIM for the TPS2111A, TPS2113A, and
TPS2115A.
To measure the resistance RILIM, connect an ohmmeter between test points
TP4 and GND. The measurement should be made with the IN1 and IN2
supplies off. To ensure accurate in-circuit resistance measurements, the
ohmmeter must apply no more than 0.5 V across the resistor.

Manual Switching Mode (TPS2110/1/4/5A Only)
2-3
EVM Setup
2.3 Manual Switching Mode (TPS2110/1/4/5A Only)
Potentiometer R2 and header J4 do not affect the operation of the manual
switching mode.
Some products like digital cameras and hand-held devices that receive power
from an internal battery or from a docking station can take advantage of the
manual-switching feature. The TPS2110/1/4/5A digital control input, D1, can
directly sense the presence of the docking station and connect the load to the
appropriate power source.
2.3.1 Configuring the TPS2110/1A for Manual Switching
To place the device into manual switching mode, short header J1. The logic
level on the D1 pin now determines which input is selected. On the EVM,
header J2 controls the D1 pin. If J2 is left open, then D1 is internally pulled high
and IN1 is selected. If J2 is shorted, then D1 is pulled low and IN2 is selected.
2.3.2 Configuring the TPS2114/5A for Manual Switching
To place the device into manual switching mode, short header J2. The logic
level on the D1 pin determines which input is selected. On the EVM, header
J3 controls the D1 pin. If J3 is left open, then D1 is internally pulled high and
IN1 is selected. If J3 is shorted, then D1 is pulled low and IN2 is selected.
2.4 Automatic Switching Modes
All EVMs support Mode 1 automatic switching. Mode 2 automatic switching is
supported by the TPS2110A–TPS2113A EVMs only.
2.4.1 Mode 1 Automatic Switching
OUT connects to the higher of IN1 and IN1 in Mode 1 automatic switching.
Refer to Table 2−1 to configure the EVM for Mode 1 automatic switching.
Table 2−1.EVM Shorting Jumper Placement for Mode 1 Automatic Switching
EVM
Device
Header
EVM
Device
J1 J2 J3 J4
HPA061−001 TPS2110A X
HPA061−002 TPS2111A X
HPA061−003 TPS2112A X
HPA061−004 TPS2113A X
HPA061−005 TPS2114A X
HPA061−006 TPS2115A X
A manufacturer can provide a secondary battery pack option to extend the
product run time with Mode 1 automatic switching. The TPS211xA cycles
between the primary and secondary batteries until both batteries are drained.

Output Voltage Holdup
2-4
2.4.2 Mode 2 Automatic Switching (TPS2110/1/2/3A Only)
In Mode 2 automatic switching, OUT connects to IN1 if the voltage at IN1 is
sufficiently high; otherwise, OUT connects to the higher of IN1 and IN2. The
threshold at which IN1 is selected corresponds to approximately 0.8 V at test
point TP3. The corresponding value of the IN1 voltage depends upon the
setting of potentiometer R2. Adjusting R2 clockwise increases the IN1
selection threshold voltage.
Refer to Table 2−2 to configure the EVM for Mode 2 automatic switching.
Table 2−2.EVM Shorting Jumper Placement for Mode 2 Automatic Switching
EVM
Device
Header
EVM
Device
J1 J2 J3 J4
HPA061−001 TPS2110A X X
HPA061−002 TPS2111A X X
HPA061−003 TPS2112A X X
HPA061−004 TPS2113A X X
A manufacturer can provide a secondary battery pack option to extend the
product run time with Mode 2 automatic switching. The TPS2110A–TPS2113A
drains the primary battery at IN1 and automatically switches to the secondary
battery at IN2.
2.5 Output Voltage Holdup
Headers J5–J8 select the output holdup capacitance.
The output voltage drops out for 60 µs (max) whenever the TPS211xA
switches between the IN1 and IN2 supplies. Some capacitance at the
TPS211xA output is necessary to prevent the output voltage from dropping too
much during the supply switchover. Excessive voltage drop can cause a
system to reset or lose data.
2.6 Switch Status (TPS2112/3/4/5A Only)
The switch status output can be monitored at the positive terminal of header
J1. A switch status output equal to logic 1 corresponds to an IN2 switch that
is on.

3-1
Schematic and Bill of Materials
    
This chapter provides the TPS211xAEVM schematic and bill of materials.
Topic Page
3.1 EVM Configurations 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Schematic 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Bill of Materials 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 3

EVM Configurations
3-2
3.1 EVM Configurations
Table 3−1.Available EVM Configurations
EVM
Device
Current-Limit Adjustment
Switch Status
Switching Modes
EVM
Designator
Device
Current-Limit Adjustment
Range
Switch Status
Output Automatic Manual
HPA061−001 TPS2110A 0.31 A–0.75 A No Yes Yes
HPA061−002 TPS2111A 0.63 A–1.25 A No Yes Yes
HPA061−003 TPS2112A 0.31 A–0.75 A Yes Yes No
HPA061−004 TPS2113A 0.63 A–1.25 A Yes Yes No
HPA061−005 TPS2114A 0.31 A–0.75 A Yes Yes Yes
HPA061−006 TPS2115A 0.63 A–1.25 A Yes Yes Yes
3.2 Schematic
Figure 3−1.TPS211xAEVM Schematic
+ +++
U1 R1 R2 R3 R5 Current-Limit
TPS2110A — 10KΩ887 332 0.31 A–0.75 A
TPS2111A — 10KΩ681 392 0.63 A–1.25 A
TPS2112A 10KΩ10KΩ887 332 0.31 A–0.75 A
TPS2113A 10KΩ10KΩ681 392 0.63 A–1.25 A
TPS2114A 10KΩ— 887 332 0.31 A–0.75 A
TPS2115A 10KΩ— 681 392 0.63 A–1.25 A

Bill of Materials
3-3
Schematic and Bill of Materials
3.3 Bill of Materials
Table 3−2.HPA601 Bill of Materials
Quantity
Ref Des −001 −002 −003 −004 −005 −006 Description MFG MFG Part # Size
1 0 0 0 0 0 IC, Power mux Texas
Instruments TPS2110APW PW−8
0 1 0 0 0 0 IC, Power mux Texas
Instruments TPS2111APW PW−8
U1 0 0 1 0 0 0 IC, Power mux Texas
Instruments TPS2112APW PW−8
0 0 0 1 0 0 IC, Power mux Texas
Instruments TPS2113APW PW−8
0 0 0 0 1 0 IC, Power mux Texas
Instruments TPS2114APW PW−8
0 0 0 0 0 1 IC, Power mux Texas
Instruments TPS2115APW PW−8
R3 1 0 1 0 1 0 Resistor, 887 Ω,
1%, 0.1 W Panasonic ERJ−6ENF8870 805
0 1 0 1 0 1 Resistor, 681 Ω,
1%, 0.1 W Panasonic ERJ−6ENF6810 805
R5 0 1 0 1 0 1 Resistor, 392 Ω,
1%, 0.1 W Panasonic ERJ−6ENF3920 805
1 0 1 0 1 0 Resistor, 332 Ω,
1%, 0.1 W Panasonic ERJ−6ENF3320 805
R1 0 0 1 1 1 1 Resistor, 10 KΩ,
1%, 0.1 W Panasonic ERJ−6ENF1002 805
R4 1 1 1 1 1 1 Resistor, Pot,
1 KΩ, 10%,
0.25 W, 12-turn
Bourns 3266W−1−102 N/A
R2 1 1 1 1 0 0 Resistor, Pot,
10 KΩ, 10%,
0.25 W, 12-turn
Bourns 3266W−1−103 N/A
C1, C2 2 2 2 2 2 2 Capacitor, 0.1 µF,
10%, 50 V, X7R Philips 12062R104K9B20D 1206
C3 1 1 1 1 1 1 Capacitor,
tantalum, 10 µF,
20%, 10 V
Vishay 293D106X0010B2T B
C4−C6 3 3 3 3 3 3 Capacitor,
tantalum, 100 µF,
20%, 10 V
Vishay 293D107X0010D2T D
J1−J8 8 8 8 8 8 8 Header, 2 pin,
0.1” center Molex 22−03−2021 N/A
TP1−TP4,
TP7 5 5 5 5 5 5 Test-point, white Keystone 5012 N/A
TP5, TP6 2 2 2 2 2 2 Test-point, sur-
face mount,
square
Keystone 5016 N/A
J9−J11 3 3 3 3 3 3 Terminal block,
125 VAC, 6A,
2 x 3,5mm
On-Shore
Tech. ED555/2DS N/A

Bill of Materials
3-4
Table 3−2.HPA601 Bill of Materials (continued)
SizeMFG Part #MFGDescription
Quantity
Ref Des SizeMFG Part #MFGDescription
−006−005−004−003−002−001
Ref Des
REF 1 1 1 1 1 1 PCB, SLVP227A American
PCB N/A
REF 4 4 4 4 4 4 Bumper, rubber,
PSA, black SPC Technology SPC2568 N/A
REF 5 5 5 5 5 5 Shorting jumper,
10 µ-inch gold 3M 929955−06 N/A

4-1
Board Layout
 
This chapter describes the TPS211xAEVM board layout and presents some
component placement considerations.
Topic Page
4.1 Layout Considerations 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 4

Layout Considerations
4-2
4.1 Layout Considerations
The IN1, IN2, and OUT pins of the TPS211xA can carry up to 1 A, so traces
to these pins should be of suitable length and width to minimize the voltage
drop to the load. Locate the 0.1 µF bypass capacitors close to the IN1, IN2, and
GND pins of the TPS211xA.
Figure 4−1.Component Placement
Figure 4−2.Top-Side Layout
Figure 4−3.Bottom-Side Layout