TI TPS82675EVM-646

User's Guide
SLVU383A – October 2010 – Revised November 2010
TPS8267xEVM
This user’s guide describes the characteristics, operation, and use of the TPS8267xEVM-646 evaluation
module (EVM). The TPS8267xEVM-646 is a fully assembled and tested platform for evaluating the
performance of the TPS82671 and TPS82675 high-frequency, synchronous, step-down dc-dc converters
optimized for battery-powered portable applications. This document includes schematic diagrams, a
printed circuit board (PCB) layout, bill of materials, and test data. Throughout this document, the
abbreviations EVM and TPS8267xEVM and the term evaluation module are synonymous with the
TPS8267xEVM-646 unless otherwise noted.
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2
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Contents
Introduction .................................................................................................................. 2
1.1
Features ............................................................................................................. 2
1.2
Applications ......................................................................................................... 2
1.3
EVM Ordering Options ............................................................................................ 2
TPS8267xEVM Schematic ................................................................................................. 3
Connector and Test Point Descriptions .................................................................................. 3
3.1
Input / Output Connectors: TPS8267xEVM .................................................................... 3
3.2
Jumpers and Switches ............................................................................................ 4
Test Configuration .......................................................................................................... 5
4.1
Hardware Setup .................................................................................................... 5
4.2
Procedure ........................................................................................................... 5
TPS8267xEVM Test Data ................................................................................................. 6
5.1
Thermal Performance ............................................................................................. 6
TPS8267xEVM Assembly Drawings and Layout ....................................................................... 8
Bill of Materials ............................................................................................................. 11
Marking Information ....................................................................................................... 11
List of Figures
1
TPS8267xEVM Schematic ................................................................................................. 3
2
Hardware Board Connection .............................................................................................. 5
3
Top Side Thermal Measurement .......................................................................................... 6
4
Bottom Side Thermal Measurement ...................................................................................... 7
5
TPS8267xEVM Component Placement (Top View) .................................................................... 8
6
TPS8267xEVM Top-Side Copper (Top View) ........................................................................... 9
7
TPS8267xEVM Bottom-Side Copper (Bottom View)
.................................................................
10
Bluetooth is a registered trademark of Bluetooth SIG.
All other trademarks are the property of their respective owners.
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TPS8267xEVM
1
Introduction
1
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Introduction
The TPS82671 and TPS82675 devices are series of high-frequency, synchronous, step-down dc-dc
converters optimized for battery-powered portable applications. Intended for low-power applications, the
TPS8267x support up to 600-mA load current, and allow the use of low-cost chip inductors and capacitors.
With a wide input voltage range of 2.3 V to 4.8 V, the devices support applications powered by lithium-ion
(Li-Ion) batteries with extended voltage ranges. Different fixed voltage output versions of the TPS8267x
are available. These converters operate at a regulated 5.5-MHz switching frequency and enter a
power-save mode operation under light load currents in order to maintain high efficiency over the entire
load current range. A PFM mode extends the battery life by reducing the quiescent current to 17 µA (typ)
during light load operation.
1.1
Features
•
•
•
•
•
•
1.2
Applications
•
•
•
•
1.3
Input voltage range: 2.3 V up to 4.8 V
Fixed output voltages
Up to 600-mA output current
5.5-MHz regulated frequency operation
Output capacitor discharge (optional)
Total solution size: < 6.7 mm2
Cell phones, smart phones
WLAN, GPS, and Bluetooth® applications
DTV tuners
Point-of-Load (PoL) applications
EVM Ordering Options
Table 1 provides the ordering information for the various EVM options.
Table 1. Ordering Information
2
Orderable EVM Number
Device Part Number
Output Voltage
Maximum Output
Current
TPS82671EVM-646
TPS82671
1.8 V
600 mA
TPS82675EVM-646
TPS82675
1.2 V
600 mA
TPS8267xEVM
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TPS8267xEVM Schematic
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2
TPS8267xEVM Schematic
Figure 1 illustrates the TPS8267xEVM-646 schematic.
+
NOTE: For reference only; see Table 2 for specific values.
Figure 1. TPS8267xEVM Schematic
3
Connector and Test Point Descriptions
3.1
Input / Output Connectors: TPS8267xEVM
3.1.1
J1 VIN
This header is the positive connection to the input power supply. The power supply must be connected
between J1 and J3 (GND). The leads to the input supply should be twisted and kept as short as possible.
The input voltage must be between 2.3 V and 5.5 V.
3.1.2
J2 S+/S–
J2 S+/S– are the sense connection for the input of the converter. Connect a voltmeter, sense connection
of a power supply, or oscilloscope to this header.
3.1.3
J3 GND
This header is the return connection to the input power supply. Connect the power supply between J3 and
J1 (VIN). The leads to the input supply should be twisted and kept as short as possible. The input voltage
must be between 2.3 V and 4.8 V.
Capacitor C3 compensates for parasitic inductance as a result of the wires from the dc power supply to
the EVM. It is not required in an actual application circuit.
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Connector and Test Point Descriptions
3.1.4
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J4 VOUT
This header is the positive output of the step-down converter. The output voltage of the devices in the
TPS8267x families have fixed output voltages; refer to the specific device data sheet for detailed
information on the device output voltage.
3.1.5
J5 S+/S–
J5 S+/S– are the sense connection for the output of the converter. Connect a voltmeter, sense connection
of an electronic load, or oscilloscope to this header.
3.1.6
J6 GND
J6 is the return connection of the converter. A load can be connected between J6 and J4 (VOUT).
3.2
3.2.1
Jumpers and Switches
JP1 ENABLE
This jumper enables/disables the converter on the EVM. Placing a shorting bar between ENABLE and ON
turns on the converter. Placing a shorting bar between ENABLE and OFF disables the converter.
3.2.2
JP2 MODE
This jumper enables/disables the power-saving mode under light loads. Placing a shorting bar between
MODE and PWM disables the power-saving mode. If the power-save mode is disabled, the converter
operates in forced PWM mode over the entire load current range.
Placing a shorting bar between MODE and PSM enables the power-saving mode. The device operates in
power-saving mode under light load conditions. See the specific device data sheet for detailed information.
4
TPS8267xEVM
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Test Configuration
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4
Test Configuration
4.1
Hardware Setup
Figure 2 illustrates a typical hardware test configuration.
J2
S-
S+
TPS826xxEVM-646
S+
GND
EN
ON
JP1
OFF
MODE
PWM PSM
JP2
Load
J6
VIN
S-
J5
J1
VOUT
GND
J4
-+
DC
Power Supply
+-
J3
Oscilloscope
J7
Figure 2. Hardware Board Connection
4.2
Procedure
Follow these procedures when configuring the EVM for testing.
CAUTION
Many of the components on the TPS8267xEVM-646 are susceptible to damage
by electrostatic discharge (ESD). Customers are advised to observe proper
ESD handling precautions when unpacking and handling the EVM, including
the use of a grounded wrist strap, bootstraps, or mats at an approved ESD
workstation. An electrostatic smock and safety glasses should also be worn.
1. Work at an ESD workstation. Make sure that any wrist straps, bootstraps, or mats are connected and
reference the user to earth ground before power is applied to the EVM. Electrostatic smocks and
safety glasses should also be worn.
2. Connect a dc power supply between J1 and J2 on the TPS8267xEVM. Note that the input voltage
should range from 2.3 V to 5.5 V. Keep the wires from the input power supply to EVM as short as
possible and twisted.
3. Connect a dc voltmeter or oscilloscope to the output sense connection of the EVM.
4. A load can be connected between J4 and J6 on the TPS8267xEVM.
5. To enable the converter, connect the shorting bar on JP1 between ENABLE and ON on the
TPS8267xEVM.
6. The TPS8267xEVM has a feature that allows users to switch between Power-Save Mode under light
loads and forced PWM mode, with jumper JP2.
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TPS8267xEVM
5
TPS8267xEVM Test Data
5
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TPS8267xEVM Test Data
This section presents typical performance data for the TPS8267xEVM. Actual performance data can be
affected by measurement techniques and environmental variables; therefore, these results are presented
for reference and may differ from actual results obtained by some users.
5.1
Thermal Performance
Figure 3 and Figure 4 show the typical thermal performance for the TPS8267x for both the top side and
the bottom side, respectively.
5.1.1
Top Side
Figure 3. Top Side Thermal Measurement
6
TPS8267xEVM
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5.1.2
Bottom Side
Figure 4. Bottom Side Thermal Measurement
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TPS8267xEVM
7
TPS8267xEVM Assembly Drawings and Layout
6
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TPS8267xEVM Assembly Drawings and Layout
Figure 5 through Figure 7 show the design of the show the design of the TPS6261x/2x/6xEVM-646 printed
circuit boards. The EVM has been designed using a two-layer, 1-ounce copper-clad PCB with all
components in an active area on the top side of the board. Moving components to both sides of the PCB
or using additional internal layers can offer additional size reduction for space-constrained systems.
NOTE: Board layouts are not to scale. These figures are intended to show how the board is laid
out; they are not intended to be used for manufacturing TPS6261x/2x/6xEVM-646 PCBs.
Note the connection of the TPS8267x feedback (FB) pin. It is recommended to connect the
FB pin directly to the inductor, not directly on the VOUT connection of the output capacitor. The
connection to the inductor is recommended because it provides better transient response
performance.
Figure 5. TPS8267xEVM Component Placement (Top View)
8
TPS8267xEVM
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Figure 6. TPS8267xEVM Top-Side Copper (Top View)
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TPS8267xEVM Assembly Drawings and Layout
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Figure 7. TPS8267xEVM Bottom-Side Copper (Bottom View)
10
TPS8267xEVM
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Bill of Materials
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7
Bill of Materials
Table 2 lists the bill of materials for the TPS8267xEVM.
Table 2. TPS8267xEVM-646 Bill of Materials
EVM Device Option:
Count
-001
-002
RefDes
Value
Description
Size
Part Number
0
0
C1, C2
Open
Capacitor, Ceramic
0603
Std
Std
1
1
C3
150 µF
Capacitor, Tantalum, 6.3V, 25mΩ, 20%
3528(B)
T520B157M006ATE025
Kemet
0
0
J7
Open
Connector, SMA , Straight, PC mount
0.210 in2
901-144-8RFX
AMP
TPS82671SIP
IC, 600-mA, High-Freq µModule Step-Down
Converter
SIP-8
TPS82671SIP
TI
TPS82675SIP
IC, 600-mA, High-Freq µModule Step-Down
Converter
SIP-8
TPS82675SIP
TI
1
0
8
0
1
U1
U1
Mfr
Marking Information
Table 3 provides the marking information for this EVM.
Table 3. Marking Information
Assembly Number
Marking Text
HPA646-001
TPS82671EVM-646
HPA646-002
TPS82675EVM-646
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TPS8267xEVM
11
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
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including product safety and environmental measures typically found in end products that incorporate such semiconductor
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electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the
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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 4.8 V and the output voltage range of 1.2 V to 1.8 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.
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