Texas Instruments Switch TPS22921 User Manual

TPS22921/22/22B Load Switch EVM  
User's Guide  
Literature Number: SLVU286  
January 2009  
 
Contents  
1
TPS22921/22/22B Load Switch Evaluation Module (EVM) ................................................ 5  
1.1  
Introduction ................................................................................................................... 5  
2
Schematics and Bill of Materials .................................................................................. 7  
EVM Options ................................................................................................................. 7  
Schematic..................................................................................................................... 7  
Bill of Materials............................................................................................................... 8  
2.1  
2.2  
2.3  
3
Board Layout ............................................................................................................. 9  
TPS22921/22/22B EVM Board............................................................................................. 9  
Layout Considerations..................................................................................................... 11  
3.1  
3.2  
4
EVM Setup ............................................................................................................... 13  
Recommended Test Equipment.......................................................................................... 13  
Calculating Voltage Drop and Load Current............................................................................ 13  
4.1  
4.2  
5
Related Documentation from Texas Instruments .......................................................... 15  
Important Notices............................................................................................................... 16  
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Contents  
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List of Figures  
3-1  
3-2  
3-3  
4-1  
TPS22921/22/22B EVM Component Placement ........................................................................ 9  
TPS22921/22/22B EVM Top-Side Layout .............................................................................. 10  
TPS22921/22/22B EVM Bottom-Side Layout........................................................................... 10  
EVM Setup For Calculating Voltage Drop and Load Current......................................................... 13  
List of Tables  
2-1  
2.4  
TPS22921/22/22B EVM Options .......................................................................................... 7  
Bill of Materials............................................................................................................... 8  
4
List of Figures  
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Chapter 1  
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TPS22921/22/22B Load Switch Evaluation Module (EVM)  
This user's guide describes the TPS22921/22/22B evaluation module (EVM). This guide contains the EVM  
schematics, bill of materials, assembly drawings, and top and bottom board layouts.  
1.1 Introduction  
The TPS22921/22/22B EVM is an evaluation module for the Texas Instruments family of low-input voltage,  
ultra-low rON load switches. This EVM operates over a 0.9 V to 3.6 V range and provides a continuous  
output current of up to 110 mA. Additional open resistor and capacitor footprints allow for the use of  
customer-selected input and output load values.  
The TPS22921/22/22B EVM accepts a YFP-6 packaged load switch for any of three (3) possible devices:  
TPS22921, TPS22922, or TPS22922B. These switches have a low threshold enable input, internally  
controlled slew rate, and ultra-low quiescent/shutdown current. The TPS22922 and TPS22922B also  
incorporate a 120-quick output discharge resistor internally.  
Table 2-1 summarizes the available EVM options.  
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TPS22921/22/22B Load Switch Evaluation Module (EVM)  
 
5
   
6
TPS22921/22/22B Load Switch Evaluation Module (EVM)  
 
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Chapter 2  
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Schematics and Bill of Materials  
2.1 EVM Options  
Table 2-1. TPS22921/22/22B EVM Options  
QUICK  
OUTPUT DISCHARGE  
MAX  
EVM  
DEVICE  
SLEW RATE  
ENABLE  
OUTPUT CURRENT  
HPA393-01  
HPA393-02  
HPA393-03  
TPS22921  
TPS22922  
TPS22922B  
30 µs  
30 µs  
No  
Yes  
Yes  
2 A  
2 A  
2 A  
Active high  
Active high  
Active high  
200 µs  
2.2 Schematic  
J2  
V
ON  
R1  
10 kΩ  
U1  
J3  
J1  
C2  
B2  
A2  
C1  
ON GND  
1
2
1
V
+
2
V
V
V
V
B1  
A1  
V
V
IN  
IN  
OUT  
OUT  
+
V
TPS22921/22/22B  
V
V
OUT  
IN  
J6  
OUT RES  
J4  
J5  
OUT CAP  
IN CAP  
C5 C6 C7 C8  
C1 C2 C3 C4  
R1 R2 R3 R4  
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Schematics and Bill of Materials  
 
7
       
Bill of Materials  
2.3 Bill of Materials  
Table 2.4. Bill of Materials  
QTY  
REFDES  
VALUE  
DESCRIPTION  
SIZE  
PART NUMBER  
MFR  
-01 -02 -03  
1
2
1
2
1
2
Two-layer, 2420 × 2320 mil, PCB  
2420 × 2320 mil  
HPA393  
Any  
GRM216R61E1  
05KA12D  
C1, C6  
1 µF  
Capacitor, ceramic, 25 V, X5R  
805  
STD  
GRM21BR61C1  
06KE15L  
1
1
0
1
1
0
1
1
0
C2  
C5  
10 µF  
0.1 µF  
Capacitor, ceramic, 16 V, X5R  
Capacitor, ceramic, 25 V, X7R  
Capacitor, ceramic, 16 V, X5R  
805  
805  
805  
STD  
STD  
STD  
GRM21BR71E1  
04KA01L  
C3, C4,  
C7, C8  
Sullins  
1
3
1
3
1
3
J2  
Header, 3 × 1 pin, 100 mil spacing  
0.100 × 0.100 in  
PEC36SAAN  
Connector  
Solutions  
Sullins  
Connector  
Solutions  
J4, J5, J6  
Header, 4 x 2 pin, 100 mil spacing  
0.100 × 0.100 in  
PEC36DAAN  
ED555/2DS  
2
Terminal block, 6A, 125 V, 3.5-mm  
pitch  
OnShore  
Technology  
2
1
1
2
1
1
J1, J3  
R1  
7 × 6.5 mm  
805  
ERJ-  
6GEYJ103V  
1
1
1
10 kΩ  
33 Ω  
Resistor, chip, 1/8 W, 5%  
Resistor, chip, 1/8 W, 5%  
Resistor, chip, 1/8 W, 5%  
STD  
STD  
ERJ-  
6GEYJ330V  
R2  
805  
ERJ-  
6GEYJ331V  
1
0
1
1
0
0
R3  
R4, R5  
U1  
330 Ω  
805  
805  
STD  
STD  
TI  
0
0
Resistor, chip, 1/8 W, 5%  
IC, ultra-small, low-input voltage, low  
TPS22921  
YFP/0.4-mm pitch WCSP TPS22921YFPR  
YFP/0.4-mm pitch WCSP TPS22922YFPR  
rON load switch  
IC, ultra-small, low-input voltage, low  
rON load switch  
0
0
1
0
0
1
U1  
U1  
TPS22922  
TI  
TI  
IC, ultra-small, low-input voltage, low  
rON load switch  
TPS22922BYFP  
TPS22922B  
YFP/0.4-mm pitch WCSP  
R
Sullins  
3
4
3
4
3
4
Conn. jumper, shorting, gold, flash  
0.100 × 0.256 in  
SPC02SYAN  
SJ-5303  
Connector  
Solutions  
Bumpon, hemisphere, .44 × .20, clear  
11.1 mm × 5.1 mm  
3M  
8
Schematics and Bill of Materials  
 
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Chapter 3  
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Board Layout  
This section contains three views of the TPS22921/22/22B EVM evaluation board as well as some layout  
considerations.  
3.1 TPS22921/22/22B EVM Board  
Figure 3-1. TPS22921/22/22B EVM Component Placement  
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Board Layout  
9
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TPS22921/22/22B EVM Board  
Figure 3-2. TPS22921/22/22B EVM Top-Side Layout  
Figure 3-3. TPS22921/22/22B EVM Bottom-Side Layout  
10  
Board Layout  
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Layout Considerations  
3.2 Layout Considerations  
The VIN and VOUT pins of U1 can carry significant current; so, traces to these pins should be of suitable  
length and width to minimize voltage drop to the load. Locate the CIN and COUT bypass capacitors close to  
the VIN and VOUT pins of U1.  
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Board Layout  
11  
 
 
12  
Board Layout  
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Chapter 4  
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EVM Setup  
4.1 Recommended Test Equipment  
The following test equipment is recommended:  
Two-channel storage oscilloscope  
Current probe  
Voltage probe  
3.6 V at 2-A power supply  
Volt-ohm meter  
4.2 Calculating Voltage Drop and Load Current  
The user should read the applicable data sheet before using the EVM.  
Figure 4-1 shows the EVM test setup for measuring input and output voltage. The load switch is enabled  
into a passive on-board load for this measurement. After measuring the voltages at both VIN and VOUT, the  
voltage drop across the switch as well as the load current can be calculated from the following equations:  
VDROP = VIN – VOUT  
ILOAD = VOUT / RLOAD  
Oscilloscope  
Voltage  
probe  
Voltage  
probe  
+
IN  
+
OUT  
EVM  
3.6 V, 2 A Max  
7” twisted pair, #20 AWG  
Figure 4-1. EVM Setup For Calculating Voltage Drop and Load Current  
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EVM Setup  
13  
 
       
14  
EVM Setup  
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Chapter 5  
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Related Documentation from Texas Instruments  
TPS22921, TPS22922, TPS22922B, Low-Input Voltage, Ultra-Low rON Load Switches data sheet  
(SLVS749)  
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Related Documentation from Texas Instruments  
 
15  
 
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  
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No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or  
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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  
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designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may  
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be required to correct this interference.  
EVM WARNINGS AND RESTRICTIONS  
It is important to operate this EVM within the input voltage range of 1.0 V to 3.6 V and the output voltage range of 1.0 V to 3.6 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.  
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.  
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Copyright © 2009, Texas Instruments Incorporated  
 
 
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TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and  
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