TPS22921/22/22B Load Switch EVM
User's Guide
Literature Number: SLVU286
January 2009
2
SLVU286 – January 2009
Submit Documentation Feedback
Contents
................................................ 5
1
TPS22921/22/22B Load Switch Evaluation Module (EVM)
1.1
Introduction ................................................................................................................... 5
2
2.1
2.2
2.3
3
3.1
3.2
.................................................................................. 7
................................................................................................................. 7
Schematic ..................................................................................................................... 7
Bill of Materials ............................................................................................................... 8
Schematics and Bill of Materials
EVM Options
............................................................................................................. 9
TPS22921/22/22B EVM Board............................................................................................. 9
Layout Considerations ..................................................................................................... 11
Board Layout
............................................................................................................... 13
4
EVM Setup
4.1
Recommended Test Equipment .......................................................................................... 13
4.2
Calculating Voltage Drop and Load Current ............................................................................ 13
5
Related Documentation from Texas Instruments
.......................................................... 15
Important Notices ............................................................................................................... 16
SLVU286 – January 2009
Submit Documentation Feedback
Contents
3
www.ti.com
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
4
TPS22921/22/22B EVM Options .......................................................................................... 7
Bill of Materials ............................................................................................................... 8
List of Figures
SLVU286 – January 2009
Submit Documentation Feedback
Chapter 1
SLVU286 – January 2009
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-Ω quick output discharge resistor internally.
Table 2-1 summarizes the available EVM options.
SLVU286 – January 2009
Submit Documentation Feedback
TPS22921/22/22B Load Switch Evaluation Module (EVM)
5
6
TPS22921/22/22B Load Switch Evaluation Module (EVM)
SLVU286 – January 2009
Submit Documentation Feedback
Chapter 2
SLVU286 – January 2009
Schematics and Bill of Materials
2.1
EVM Options
Table 2-1. TPS22921/22/22B EVM Options
2.2
EVM
DEVICE
SLEW RATE
QUICK
OUTPUT DISCHARGE
MAX
OUTPUT CURRENT
ENABLE
HPA393-01
TPS22921
30 µs
No
2A
Active high
HPA393-02
TPS22922
30 µs
Yes
2A
Active high
HPA393-03
TPS22922B
200 µs
Yes
2A
Active high
Schematic
1
2
3
J2
VON
R1
10 kΩ
J1
U1
C2
V+
V–
J3
1
ON
B2 VIN
GND
VOUT
2
A2 VIN
VOUT
C1
B1
1
A1
2
V+
V–
TPS22921/22/22B
VOUT
3
5
1
1
J6
OUT RES
2
2
3
5
6
4
4
7
7
8
8
6
1
2
1
3
3
4
2
4
7
5
5
7
6
8
8
6
J5
OUT CAP
ROUT2
ROUT1
330
33
COUT1
COUT2
C5 C6 C7 C8
1 µF
CIN2
CIN1
10 µF
1 µF
C1 C2 C3 C4
J4
IN CAP
0.1 µF
3
5
1
1
2
2
3
5
6
4
4
6
8
8
7
7
VIN
R1 R2 R3 R4
SLVU286 – January 2009
Submit Documentation Feedback
Schematics and Bill of Materials
7
Bill of Materials
2.3
www.ti.com
Bill of Materials
Table 2.4. Bill of Materials
QTY
-01
-02
-03
1
1
1
REFDES
VALUE
DESCRIPTION
SIZE
MFR
–
–
Two-layer, 2420 × 2320 mil, PCB
2420 × 2320 mil
HPA393
Any
STD
2
2
2
C1, C6
1 µF
Capacitor, ceramic, 25 V, X5R
805
GRM216R61E1
05KA12D
1
1
1
C2
10 µF
Capacitor, ceramic, 16 V, X5R
805
GRM21BR61C1
06KE15L
STD
1
1
1
C5
0.1 µF
Capacitor, ceramic, 25 V, X7R
805
GRM21BR71E1
04KA01L
STD
0
0
0
C3, C4,
C7, C8
–
Capacitor, ceramic, 16 V, X5R
805
–
STD
1
1
1
J2
–
Header, 3 × 1 pin, 100 mil spacing
0.100 × 0.100 in
PEC36SAAN
Sullins
Connector
Solutions
3
J4, J5, J6
–
Header, 4 x 2 pin, 100 mil spacing
0.100 × 0.100 in
PEC36DAAN
Sullins
Connector
Solutions
2
J1, J3
–
Terminal block, 6A, 125 V, 3.5-mm
pitch
7 × 6.5 mm
ED555/2DS
OnShore
Technology
3
3
2
2
1
1
1
R1
10 kΩ
Resistor, chip, 1/8 W, 5%
805
ERJ6GEYJ103V
STD
1
1
1
R2
33 Ω
Resistor, chip, 1/8 W, 5%
805
ERJ6GEYJ330V
STD
1
1
1
R3
330 Ω
Resistor, chip, 1/8 W, 5%
805
ERJ6GEYJ331V
STD
0
0
0
R4, R5
–
Resistor, chip, 1/8 W, 5%
805
–
STD
YFP/0.4-mm pitch WCSP
TPS22921YFPR
TI
1
8
PART NUMBER
0
0
U1
TPS22921
IC, ultra-small, low-input voltage, low
rON load switch
0
1
0
U1
TPS22922
IC, ultra-small, low-input voltage, low
rON load switch
YFP/0.4-mm pitch WCSP
TPS22922YFPR
TI
0
0
1
U1
TPS22922B
IC, ultra-small, low-input voltage, low
rON load switch
YFP/0.4-mm pitch WCSP
TPS22922BYFP
R
TI
3
3
3
–
–
Conn. jumper, shorting, gold, flash
0.100 × 0.256 in
SPC02SYAN
Sullins
Connector
Solutions
4
4
4
–
–
Bumpon, hemisphere, .44 × .20, clear
11.1 mm × 5.1 mm
SJ-5303
3M
Schematics and Bill of Materials
SLVU286 – January 2009
Submit Documentation Feedback
Chapter 3
SLVU286 – January 2009
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
SLVU286 – January 2009
Submit Documentation Feedback
Board Layout
9
TPS22921/22/22B EVM Board
www.ti.com
Figure 3-2. TPS22921/22/22B EVM Top-Side Layout
Figure 3-3. TPS22921/22/22B EVM Bottom-Side Layout
10
Board Layout
SLVU286 – January 2009
Submit Documentation Feedback
www.ti.com
3.2
Layout Considerations
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.
SLVU286 – January 2009
Submit Documentation Feedback
Board Layout
11
12
Board Layout
SLVU286 – January 2009
Submit Documentation Feedback
Chapter 4
SLVU286 – January 2009
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
3.6 V, 2 A Max
+
IN
–
EVM
+
OUT
–
7” twisted pair, #20 AWG
Figure 4-1. EVM Setup For Calculating Voltage Drop and Load Current
SLVU286 – January 2009
Submit Documentation Feedback
EVM Setup
13
14
EVM Setup
SLVU286 – January 2009
Submit Documentation Feedback
Chapter 5
SLVU286 – January 2009
Related Documentation from Texas Instruments
•
TPS22921, TPS22922, TPS22922B, Low-Input Voltage, Ultra-Low rON Load Switches data sheet
(SLVS749)
SLVU286 – January 2009
Submit Documentation Feedback
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
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 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.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2009, Texas Instruments Incorporated
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. All products are
sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard
warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where
mandated by government requirements, testing of all parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and
applications using TI components. To minimize the risks associated with customer products and applications, customers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right,
or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information
published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a
warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual
property of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied
by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive
business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional
restrictions.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all
express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. 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 expertise in the safety and regulatory ramifications of their applications, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products
and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be
provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in
such safety-critical applications.
TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are
specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military
specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at
the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.
TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are
designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated
products in automotive applications, TI will not be responsible for any failure to meet such requirements.
Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products
Amplifiers
Data Converters
DLP® Products
DSP
Clocks and Timers
Interface
Logic
Power Mgmt
Microcontrollers
RFID
RF/IF and ZigBee® Solutions
amplifier.ti.com
dataconverter.ti.com
www.dlp.com
dsp.ti.com
www.ti.com/clocks
interface.ti.com
logic.ti.com
power.ti.com
microcontroller.ti.com
www.ti-rfid.com
www.ti.com/lprf
Applications
Audio
Automotive
Broadband
Digital Control
Medical
Military
Optical Networking
Security
Telephony
Video & Imaging
Wireless
www.ti.com/audio
www.ti.com/automotive
www.ti.com/broadband
www.ti.com/digitalcontrol
www.ti.com/medical
www.ti.com/military
www.ti.com/opticalnetwork
www.ti.com/security
www.ti.com/telephony
www.ti.com/video
www.ti.com/wireless
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2009, Texas Instruments Incorporated
