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
SLVU286–January 2009
Contents
3
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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-Ω quick output discharge resistor internally.
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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
SLVU286–January 2009
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
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
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
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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
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Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. This
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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
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
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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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