Using the TPS2500/1 EVM
User's Guide
Literature Number: SLUU363
June 2009
User's Guide
SLUU363 – June 2009
TPS2500/1, Power-Distribution Switch
With Low Voltage Input EVM
This user’s guide describes the TPS2500/1DRCEVM evaluation modules (EVM). This guide contains the
EVM schematic, bill of materials, assembly drawing, and top and bottom board layouts.
1
Introduction
The TPS2500/1DRCEVM is an evaluation module (EVM) for Texas Instruments’ family of
power-distribution switches with adjustable current-limit. These EVMs operate over a 1.8-V to 5.25-V
range providing 5-V output for USB devices. An onboard jumper sets the output current-limit to either 0.5
A or 1 A. Test points provide convenient access to all critical node voltages.
The silkscreen outline on the PCB top-side encloses components found in a typical USB application.
The TPS2500/1 is in an SON package with a thermal pad. These switches have an enable input, an
overcurrent status output, and overtemperature shutdown.
1.1
Related Documentation from Texas Instruments
TPS2500/1 data sheet (TI Literature Number SLVS886)
2
Electrical Specifications
The EVM meets the electrical specifications in Table 1 over the recommended operating
junction-temperature range of -40°C ≤ TJ ≤ 125°C for the DRV (SON) package.
Table 1. EVM Electrical Specifications
PARAMETER
Input voltage, VIN
Short-circuit output
current-limit, ILIMIT
2.1
CONDITION
J1
MIN
TYP
MAX
1.8
–
6.5
J2 shorting-jumper is absent, J3 is short
circuited, TPS2500/1 is enabled
0.600
0.652
0.710
J2 shorting-jumper is present, J3 is short
circuited, TPS2500/1 is enabled
1.215
1.283
1.362
UNIT
V
A
Electrostatic Discharge
The EVM has been tested to IEC 61000-4-2. The level used was 8-kV contact discharge and 15-kV air
discharge. Surges were applied to the EVM input and output. No damage to the TPS2500/1 was
observed.
2
TPS2500/1, Power-Distribution Switch
With Low Voltage Input EVM
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Schematic
www.ti.com
3
Schematic
3.1
EVM Options
Table 2. EVM Options
3.2
HPA337
DEVICE
DEVICE PACKAGE
ECO MODE
-1
TPS2500DRC
SON
Enabled
-2
TPS2501DRC
SON
Disabled
Schematic
Figure 1. EVM Schematic
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TPS2500/1, Power-Distribution Switch
With Low Voltage Input EVM
3
EVM Setup
www.ti.com
4
EVM Setup
4.1
Recommended Test Equipment
The following test equipment is recommended:
• Two-channel storage oscilloscope
• Current probe
• Voltage probe
• An adjustable power supply with a 1.75-V to 6.5-V output and a 10-A output current-limit
• Volt-ohm meter
• A passive or active load capable of handling 3 A.
4.2
Measuring the Short-Circuit Output Current-Limit
The user should read the TPS2500/1 data sheet before using the EVM.
Figure 2 shows the EVM test setup for measuring current-limit. Switch S1 enables the power-distribution
switch into a short circuit for this measurement. Figure 3 shows the current waveform for the TPS2500/1
EVM with a shorting jumper populating header J3; Figure 4 shows the current waveform with header J3
unpopulated.
Oscilloscope
Voltage Probe
Current
Probe
FAULT
+
IN
-
5V, 5A
EVM
+
OUT
-
0-W
7" Twisted Pair, #20AWG
Figure 2. EVM Setup For Measuring Current-Limit
4
TPS2500/1, Power-Distribution Switch
With Low Voltage Input EVM
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EVM Setup
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Figure 3. TPS2500EVM Short-Circuit Output
Current and
FAULT Status With J3 Shorting Jumper
Present.
4.3
Figure 4. TPS2500EVM Short-Circuit Output
Current and
FAULT Status With J3 Shorting Jumper
Absent.
Adjusting the Short-Circuit Output Current-Limit
The EVM provides two current-limit settings. If a different setting is required, then populate header J3 with
a shorting jumper and modify resistor R3 using the current limit resistor calculator, TI Literature Number
SLVC163.
See the TPS2500/1 data sheet for the worst-case current-limit variation.
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TPS2500/1, Power-Distribution Switch
With Low Voltage Input EVM
5
Board Layout
5
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Board Layout
Figure 5. EVM Top Assembly
6
TPS2500/1, Power-Distribution Switch
With Low Voltage Input EVM
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Board Layout
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Figure 6. EVM Top-Side Layout
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TPS2500/1, Power-Distribution Switch
With Low Voltage Input EVM
7
Board Layout
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Figure 7. EVM Bottom Assembly
8
TPS2500/1, Power-Distribution Switch
With Low Voltage Input EVM
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Board Layout
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Figure 8. EVM Bottom-Side Layout
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TPS2500/1, Power-Distribution Switch
With Low Voltage Input EVM
9
List of Materials
6
www.ti.com
List of Materials
Table 3. TPS2500/1 List of Materials (1) (2) (3) (4)
TPS2501
(1)
(2)
(3)
(4)
10
TPS2500
REF DES
DESCRIPTION
PART NUMBER
MFR
1
1
C1
Capacitor, ceramic, 10 V, X5R, 10%, 10 µF, 0805
C2012X5R1A10
6K
2
2
C2, C5
Capacitor, ceramic, 16 V, X7R, 10%, 0.1 µF, 0805
STD
STD
1
1
C3
Capacitor, aluminum, SM, 20%, 6.3 V , 100 µF, D Code
EEVFK0J101P
Panasonic
C3225X5R1A22
6M
TDK
TDK
1
1
C4
Capacitor, ceramic, 10 V, X5R, 10%, 22 µF, 1210
1
1
C6
Capacitor, tantalum, 150 µF, 10 V, 100 mΩ, 10%, 150 µF, B45197A2157K
7343 (D)
409
KEMET
1
1
C7
Capacitor, aluminum, 6.3 V, 20%, 470 µF, 0.328 x 0.390
inch
EEVFK0J471P
Panasonic
3
3
J1, J5, J6
Terminal block, 2 pin, 6 A, 3.5 mm, 0.27 x 0.25 inch
ED1514
OST
PTC36SAAN
Sullins
3
3
J2, J3, J4
Header, male 2 pin, 100-mil spacing, (36-pin strip), 0.100
inch x 2
1
1
L1
Inductor, SMT, 2.3 A, 70 mΩ, 2.2 µH, 0.153 x 0.153 inch
LPS4018-222ML Coilcraft
0
0
L2
Inductor, SMT, 4.2 A, 16.5 mΩ, 2.2 µH, 0.300 sq"
DR73-2R2-R
Coiltronics
3
3
R1, R4,
R5
Resistor, chip, 1/16 W, 5%, 10 kΩ, 0603
CRCW0603103-J
Vishay
2
2
R2, R3
Resistor, chip, 1/16 W, 1%, 20.0 kΩ, 0603
CRCW06032002-F
Vishay
0
0
SH1
Ground symbol
4
4
TP1, TP2,
Test point, SM, 0.150 x 0.090, 5016, 0.185 x 0.135 inch
TP3, TP4
5016
Keystone
8
8
TP5, TP6,
TP7, TP8,
TP9,
Test point, white, thru hole color keyed, 5002, 0.100 x
TP10,
0.100 inch
TP11,
TP12
5002
Keystone
0
1
U1
Integrated USB Switch w/ Boost Converter, DRC10
TPS2500DRC
TI
1
0
U1
Integrated USB Switch w/ Boost Converter, DRC10
TPS2500DRC
TI
1
1
--
PCB, 2.3 In x 2.7 In x 0.062 In
HPA337
Any
3
3
--
Shunt, 100 mil, black, 0.100
929950-00
3M
1. These assemblies are ESD sensitive, ESD precautions shall be observed.
2. These assemblies must be clean and free from flux and all contaminants. Use of no clean flux is not acceptable.
These assemblies must comply with workmanship standards IPC-A-610 Class 2.
Ref designators marked with an asterisk ('**') cannot be substituted. All other components can be substituted with equivalent
MFG's components.
TPS2500/1, Power-Distribution Switch
With Low Voltage Input EVM
SLUU363 – June 2009
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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
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measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does
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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
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EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 1.8 V to 5.5 V and the output voltage range of 1.8 V to 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 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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