User's Guide
SLVU364–March 2010
TPS62065/67EVM
This user’s guide describes the characteristics, operation, and use of the TPS62065-67EVM-347
evaluation module (EVM). The TPS62065-67EVM-347 is a fully assembled and tested platform for
document includes schematic diagrams, printed circuit board (PCB) layout, bill of materials, and test data.
Throughout this document, the abbreviations EVM, TPS62065/67EVM, and the term evaluation module
are synonymous with the TPS62065-67EVM-347 unless otherwise noted.
Contents
1
2
3
4
5
6
7
8
Introduction .................................................................................................................. 2
Electrical Performance Specifications .................................................................................... 2
TPS62056/67EVM Schematic ............................................................................................. 3
Connector and Test Point Descriptions .................................................................................. 4
Test Configuration .......................................................................................................... 6
TPS62065/67EVM Test Data .............................................................................................. 8
TPS62065/67EVM-347 Assembly Drawings and Layout ............................................................ 12
Bill of Materials ............................................................................................................. 18
List of Figures
1
TPS62065EVM Schematic ................................................................................................
TPS62067EVM Schematic ................................................................................................
Hardware Board Connection ..............................................................................................
TPS62065, TPS62067 Efficiency vs Load Current .....................................................................
TPS62065 Startup into 2.2-Ω Load.......................................................................................
TPS62067 Startup into 2.2-Ω Load.......................................................................................
TPS62067 Shutdown: No Load ...........................................................................................
2
3
4
5
6
7
8
TPS62065 Output Voltage Ripple (PFM Mode) ....................................................................... 10
TPS62065 Output Voltage Ripple (PWM Mode) ...................................................................... 10
TPS62065 Gain and Phase vs Frequency............................................................................. 11
TPS62065 Gain and Phase vs Frequency............................................................................. 11
TPS62065/67EVM Component Placement (Top View) .............................................................. 13
TPS62065/67EVM Top-Side Copper (Top View) ..................................................................... 14
TPS62065/67EVM Internal Layer 2 (X-Ray View, from Top)........................................................ 15
TPS62065/67EVM Internal Layer 1 (X-Ray View, from Top)........................................................ 16
TPS62065/67EVM Bottom-Side Copper (Bottom View) ............................................................. 17
9
10
11
12
13
14
15
16
List of Tables
1
2
TPS62065/67EVM Performance Characteristics .......................................................................
TPS62065/67EVM Bill of Materials ..................................................................................... 18
All trademarks are the property of their respective owners.
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Connector and Test Point Descriptions
4
Connector and Test Point Descriptions
4.1 Enable Jumpers/Switches: TPS62065EVM
4.1.1
J10 VIN
This header is the positive connection to the input power supply. The power supply must be connected
between J10 and J12 (GND). The leads to the input supply should be twisted and kept as short as
possible. The input voltage must be between 3.0 V and 6.0 V.
4.1.2
4.1.3
J11 S+/S–
J11 S+/S– are the sense connections for the input of the converter. Connect a voltmeter, or the sense
connection of a power supply or oscilloscope, to this header.
J12 GND
This header is the return connection to the input power supply. Connect the power supply between J12
and J10 (VIN). The leads to the input supply should be twisted and kept as short as possible. The input
voltage must be between 3.0 V and 6.0 V.
4.1.4
J13 VOUT
This header is the positive output of the step-down converter. The output voltage of the TPS62065 is
adjustable with feedback resistors R10 and R11. On the EVM, the output voltage is set to 1.8 V by default.
detailed information.
4.1.5
4.1.6
4.1.7
J14 S+/S–
J14 S+/S– are the sense connections for the output of the converter. Connect a voltmeter, or the sense
connection of an electronic load or oscilloscope, to this header.
J15 GND
J15 is the return connection of the converter. A load can be connected between J15 and J13 (VOUT). The
converter is capable of carrying a load current up to 2000 mA.
JP10 EN
This jumper enables/disables the TPS62065 on the EVM. Shorting jumper JP10 between the center pin
and On turns on the unit. Shorting the jumper between center pin and Off turns the unit off. A 1-MΩ
pull-up resistor is connected between VIN and EN. Removing jumper JP10 turns on the converter.
4.1.8
JP11 MODE
This jumper enables/disables the power-saving mode under light loads. Shorting jumper JP11 between
the center pin 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. Shorting the jumper between
the center pin and PWM/PSM enables the power-saving mode. The device operates in power-saving
mode under light load conditions. See the TPS6206x data sheet (SLVS833) for a detailed description of
this configuration. A 1-MΩ pulldown resistor is connected between GND and MODE. By removing JP11,
the converter operates in power-saving mode under light load conditions.
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Connector and Test Point Descriptions
4.1.9
J16 VOUT (SMA)
This SMA connector is connected to the output voltage of the TPS62065. It can be used to easily analyze
the noise spectrum of the output voltage with a spectrum analyzer. By default, J16 is not assembled on
the EVM.
4.2 Enable Jumpers/Switches: TPS62067EVM
4.2.1
J20 VIN
This header is the positive connection to the input power supply. The power supply must be connected
between J10 and J12 (GND). The leads to the input supply should be twisted and kept as short as
possible. The input voltage must be between 3.0 V and 6.0 V.
4.2.2
4.2.3
J21 S+/S–
J21 S+/S– are the sense connections for the converter input. Connect a voltmeter, or the sense
connection of a power supply or an oscilloscope, to this header.
J22 GND
This header is the return connection to the input power supply. Connect the power supply between J22
and J20 (VIN). The leads to the input supply should be twisted and kept as short as possible. The input
voltage must be between 3.0 V and 6.0 V.
4.2.4
J23 VOUT
This header is the positive output of the step-down converter. The output voltage of the TPS62067 is
adjustable with the feedback resistors R20 and R21. On the EVM, the output voltage is set to 3.3 V by
default.
for detailed information.
4.2.5
4.2.6
4.2.7
J24 S+/S–
J24 S+/S– are the sense connections for the converter output. Connect a voltmeter, or the sense
connection of an electronic load or an oscilloscope, to this header.
J25 GND
J25 is the return connection of the converter. A load can be connected between J25and J23 (VOUT). The
converter is capable of a load up to 2,000 mA load current.
J26 PG
PG (Power Good) is an open-drain output. A 1-MΩ pull-up resistor is connected between VIN and PG.
This circuit is active once the device is enabled. It is driven by an internal comparatir that is connected to
the FB voltage. The PG output provides a high-level output once the FB voltage reaches 95% of its
nominal value. The PG output provides a low-level output when the FB voltage falls below 90% of its
nominal value.
NOTE: This function is only available on the TPS62067EVM.
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Test Configuration
4.2.8
JP20 EN
This jumper enables/disables the TPS62067 device on the EVM. Shorting jumper JP20 between the
center pin and On turns on the unit. Shorting the jumper between center pin and Off turns the unit off. A
1-MΩ pull-up resistor is connected between VIN and EN. Removing jumper JP20 also turns on the
converter.
4.2.9
J27 VOUT (SMA)
This SMA connector is connected to the output voltage of the TPS62067. It can be used to easily analyze
the noise spectrum of the output voltage with a spectrum analyzer. By default, J27 is not assembled on
the EVM.
5
Test Configuration
5.1 Hardware Setup
Figure 3 illustrates a typical hardware test configuration.
Oscilloscope
JP10
ON EN OFF
VIN
S+
VOUT
S+
DC
Power Supply
Load
S-
S-
GND
GND
TPS62065/67EVM-347
Figure 3. Hardware Board Connection
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Test Configuration
5.2 Testing Procedure
Follow these procedures when configuring the EVM for testing.
CAUTION
Many of the components on the TPS62065/67EVM-347 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. Connect a dc power supply between J10 and J12 on the TPS62065EVM, or J20 and J22 on the
TPS62067EVM. Please note that the input voltage should be between 3.0 V and 6.0 V. Keep the wires
from the input power supply to the EVM as short as possible and twisted.
2. Connect a dc voltmeter or oscilloscope to the output sense connection of the EVM (J14 on the
TPS62065EVM, J24 on the TPS62067EVM).
3. A load can be connected between J13 and J15 on the TPS62065EVM, or J23 and J25 on the
TPS62067EVM.
4. To enable the converter, connect the shorting bar on JP10 (JP20) between EN and ON on the
TPS62065EVM (TPS62067EVM).
5. The TPS62065EVM has a feature to allow the user to switch between Power-Save Mode under light
loads and forced PWM mode; this feature is enabled or disabled with jumper JP11. This feature is only
available on the TPS62065EVM.
6. The TPS62067EVM has a PG (Power Good) output. The PG pin on the TPS62067 is connected to
J26. PG is an open-drain output. The output is pulled up with a 1-MΩ pull-up resistor (R22) to VIN.
This feature is only available on the TPS62067EVM.
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TPS62065/67EVM Test Data
6
TPS62065/67EVM Test Data
performance data can be affected by measurement techniques and environmental variables; therefore,
these curves are presented for reference and may differ from actual results obtained by some users.
6.1 Efficiency
Figure 4 shows the typical efficiency performance for the TPS62065 and TPS62067.
EFFICIENCY vs LOAD CURRENT
100
95
90
85
80
75
70
65
60
55
50
VIN = 3.0 V
VIN = 3.3 V
L = 1.0 mH (LQH441R0)
VIN = 3.6 V
VIN = 4.2 V
VIN = 5.0V
COUT = 10 mF (0603 size)
VOUT =1.8 V
Mode: Auto PFM/PWM
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
IOUT (A)
Figure 4. TPS62065, TPS62067 Efficiency vs Load Current
6.2 Start-up: TPS62065
Figure 5 shows the typical start-up performance for the TPS62065 using the TPS62065EVM.
TPS62065 Startup
2 V/div
1 V/div
2 A/div
L = 1.2 mH
500 mA/div
COUT = 10 mF
VIN = 3.6 V
500 mA/div
VOUT = 1.8 V
Load = R2R
Time (100 ms/div)
Conditions: VIN = 3.6 V, VOUT = 1.8 V
Figure 5. TPS62065 Startup into 2.2-Ω Load
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TPS62065/67EVM Test Data
6.3 Start-up and Shutdown: TPS62067
TPS62067, using the TPS62067EVM.
TPS62067 Startup
2 V/div
2 V/div
1 A/div
VIN = 4.2 V
VOUT = 3.3 V
Load = 2R2
2 V/div
PG Pull-up Resistor = 10 kW
Time (100 ms/div)
Conditions: VIN = 4.2 V, VOUT = 3.3 V
Figure 6. TPS62067 Startup into 2.2-Ω Load
TPS62067 Shutdown
2 V/div
VIN = 4.2 V
VOUT = 3.3 V
Load = No Load
PG Pull-up Resistor = 10 kW
2 V/div
5 V/div
Time (1 ms/div)
Conditions: VIN = 4.2 V, VOUT = 3.3 V
Figure 7. TPS62067 Shutdown: No Load
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TPS62065/67EVM Test Data
6.4 Output Voltage Ripple (Power-Save Mode)
respectively, with the TPS62065EVM.
TYPICAL OUTPUT VOLTAGE RIPPLE (PFM MODE)
IOUT = 20 mA
MODE = GND
VIN = 3.6 V
L = 1.2 mH
COUT = 10 mF
VOUT = 1.8 V
VOUT
:
50 mV/div
SW:
2 V/div
ICOIL
:
200 mA/div
Time (4 ms/div)
Figure 8. TPS62065 Output Voltage Ripple (PFM Mode)
TYPICAL OUTPUT VOLTAGE RIPPLE (PWM MODE)
VOUT
:
50 mV/div
SW:
2 V/div
ICOIL
:
500 mA/div
IOUT = 500 mA
MODE = GND
VIN = 3.6 V
L = 1.2 mH
COUT = 10 mF
VOUT = 1.8 V
Time (100 ns/div)
Figure 9. TPS62065 Output Voltage Ripple (PWM Mode)
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TPS62065/67EVM Test Data
6.5 Control Loop Bode Diagrams: TPS62065
Figure 10 and Figure 11 illustrate typical TPS62065 gain and phase performance versus frequency at VIN
= 3.6 V and 5.0 V, respectively, using the TPS62025EVM.
Conditions: VIN = 3.6 V, VOUT = 1.8 V, IOUT = 1.6 A; bandwidth: 224 kHz, phase margin: 59°
Figure 10. TPS62065 Gain and Phase vs Frequency
Conditions: VIN = 5.0 V, VOUT = 1.8 V, IOUT = 1.6 A; bandwidth: 271 kHz, phase margin: 54°
Figure 11. TPS62065 Gain and Phase vs Frequency
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TPS62065/67EVM-347 Assembly Drawings and Layout
7
TPS62065/67EVM-347 Assembly Drawings and Layout
EVM has been designed using a four-layer, 1-ounce copper-clad PCB (3.81 cm by 4.57 cm) with all
components in an active area on the top side of the board. All active traces to the top and bottom layers to
allow the user to easily view, probe, and evaluate the TPS62025/67 control ICs in a practical,
double-sided application environment. 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 TPS62065/67EVM-347 PCBs.
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TPS62065/67EVM-347 Assembly Drawings and Layout
38.10 mm
(1.50 inch)
38.10 mm
(1.50 inch)
45.72 mm
(1.80 inch)
Figure 12. TPS62065/67EVM Component Placement (Top View)
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Bill of Materials
8
Bill of Materials
Table 2 lists the bill of materials for the TPS62065/67EVM.
Table 2. TPS62065/67EVM Bill of Materials(1)(2)(3)(4)
Count
RefDes
C10, C20
C11, C21
Value
22 mF
22 pF
Description
Capacitor, ceramic, 10 V, X7R, 10%
Capacitor, ceramic, 10 V, NGO, 5%
Size
1210
0603
Part Number
GRM32ER71A226K
Standard
MFR
2
2
MuRata
Standard
C12, C13,
C22, C23
GRM188R60J106ME47
D
4
0
10 mF
Capacitor, ceramic, 6.3 V, X5R, 20%
Capacitor, ceramic, 6.3 V, X5R, 20%
0603
0603
muRata
muRata
GRM188R60J106ME47
D
C14, C24
Open
0.210 in2
1515
0
2
1
2
1
J16, J27
L10, L20
R10
Open
1.0 mH
360 kΩ
180 kΩ
820 kΩ
Connector, SMA , straight, PC mount
Inductor, chip coil, ±30%
901-144-8RFX
LQH44PN1R0NP0L
Standard
AMP
Murata
Std
Resistor, chip, 1/16W, 1%
Resistor, chip, 1/16W, 1%
Resistor, chip, 1/16W, 1%
0603
R11, R21
R20
0603
Standard
Std
0603
Standard
Std
R12, R13,
R22, R23
4
1.00 MΩ
Resistor, chip, 1/16W, 1%
0603
Standard
Std
1
1
U10
U20
TPS62065DSG
TPS62067DSG
IC, step-down converter, 3 MHz, 1.6 A
IC, step-down converter, 3 MHz, 1.6 A
SON-8
SON-8
TPS62065DSG
TPS62067DSG
TI
TI
(1)
(2)
(3)
(4)
These assemblies are ESD sensitive. ESD precautions must be observed.
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.
Reference designators marked with an asterisk (**) cannot be substituted. All other components can be substituted with equivalent
manufacturing components.
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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 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
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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
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This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
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EVM Warnings and Restrictions
It is important to operate this EVM within the input voltage range of 3.0 V to 6.0 V and the output voltage range of 0.8 V to 6.0 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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