This User's Guide describes the characteristics, operation, and use of the TPS61280 evaluation module
(EVM). This EVM enables test and evaluation of the Texas Instruments' TPS61280 device, a 2.3-MHz
(typ.), up to 4.8-V input, step-up dc-dc converter with integrated Pass-Through Mode. This User's Guide
includes EVM specifications, user software description, the schematic diagram, bill of materials, and board
layout. After the release of the A-version device in the summer of 2014, the EVM is assembled with the
TPS61280A (supports PWM mode during startup which is not available for TPS61280).
The TPS61280 device provides a power-supply solution for products powered by either a three-cell
alkaline, NiCd or NiMH battery, or a single-cell Li-Ion or Li-polymer battery. The wide input voltage range
is ideal for portable power applications such as mobile phones or computer peripherals. In addition, the
TPS61280 can also maintain its output biased at the input voltage level. In this mode, the synchronous
rectifier is current-limited, and allows external loads (for example, an audio amplifier) to be powered with a
restricted supply. In this mode, quiescent current is reduced to 18 μA. Input current in shutdown mode is
less than 5 μA in order to maximize battery life.
1.1Requirements
The TPS61280EVM is designed to operate over the full input voltage range and produces a fixed output
voltage.
In order to operate this EVM, only a dc power supply able to deliver between 2.3 V and 4.8 V is required.
1.2Applications
•Single-Cell Ni-Rich, Si-Anode, Li-Ion, LiFePO4 smart-phones or tablet PCs
•2.5G, 3G, and 4G mini-module data cards
•Current-limited applications featuring high peak power loads
1.3Features
•95% Efficiency at 2.3-MHz operation
•VINrange from 2.3 V to 4.8 V
•2-μA quiescent current in low IQ pass-through mode
•Integrated pass-through mode (35 mΩ)
•Programmable valley inductor current limit and output voltage via I²C interface
•True pass-through mode during shutdown
•Thermal shutdown and overload protection
•Total solution size < 20 mm², sub 1-mm Profil
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2
TPS61280-585 Evaluation ModuleSLVU955A–December 2013–Revised June 2014
This header is the positive connection to the input power supply. The power supply must be connected
between these pins and pins 5 and 6 (GND). Twist the leads to the input supply and keep them as short
as possible. The input voltage must be between 2.3 V and 4.8 V.
3.1.2Pin 3: Input Sense VIN
This header is intended to measure the input voltage directly on the input capacitor close to the device.
Therefore, a four-wire power and sense supply can be connected. Twist the leads to the sensing
connector.
Pin 4: Input Sense GND
This header is intended to measure the GND close to the input of the device. Therefore, a four-wire power
and sense supply can be connected. Twist the leads to the sensing connector.
3.1.3Pin 5 and 6: GND
This header is the return connection to the input power supply. Connect the power supply between these
pins and pins 1 and 2 (VIN). Twist the leads to the input supply and keep them as short as possible. The
input voltage must be between 2.3 V and 4.8 V.
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3.2J2 Output Connector
3.2.1Pin 1 and 2: VOUT
This header is the positive connection of the output voltage. Connect the load between these pins and
pins 5 and 6 (GND).
3.2.2Pin 3: Output Sense VOUT
This header is intended to measure the output voltage directly on the output capacitors.
3.2.3Pin 4: Output Sense GND
This header is intended to measure the GND close to the output of the device.
Pin 5 and 6: GND
This is the return connection of the output voltage. Connect the load between these pins and Pin 1 and 2
(VOUT).
4
TPS61280-585 Evaluation ModuleSLVU955A–December 2013–Revised June 2014
This 10-pin header connects the USB-to-GPIO adaptor to the TPS61280EVM-585.
J10: SMA Input Connector
This SMA connector is connected to the input voltage of the converter. It can be used to easily analyze
the noise spectrum of the input voltage with a spectrum analyzer. By default, J10 is not assembled on the
EVM.
3.3.1J11: SMA Output Connector
This SMA connector is connected to the output voltage of the converter. It can be used to easily analyze
the noise spectrum of the output voltage with a spectrum analyzer. By default, J11 is not assembled on
the EVM.
3.4Jumpers
3.4.1J3: Enable Jumper
Placing a jumper across pins EN and ON ties the EN pin to VIN, and enables the device. Placing a jumper
across pins EN and OFF ties the EN pin to GND, which disables the device.
J4: VSEL, Output Voltage Selection
Placing a jumper across pins HIGH and VSEL ties the VSEL pin to VIN, and selects the default output roof
voltage. Placing a jumper across pins LOW and VSEL ties the VSEL pin to GND, and selects the default
output floor voltage.
Connector and Test Point Descriptions
Table 1. TPS61280 VSEL Settings
ValueDescriptionDefault Output Voltage
HIGHSelects the Output Roof Voltage as stored in register 0x033.15 V
LOWSelects the Output Floor Voltage as stored in register 0x023.35 V
J5: nBYP, Forced Bypass Selection
Placing a jumper across pins nBYP and ON ties the nBYP pin to GND and enables the pass-through
mode. Placing a jumper across pins nBYP and OFF ties the nBYP pin to VIN and enables auto DC/DC
boost mode.
Table 2. TPS61280 Mode of Operations
EN InputnBYP InputDevice Status
LOWLOWThe device is shut down in pass-through mode featuring a shutdown current down to ca. 2 μA typ. The
LOWHIGHThe device is shut down and the output voltage is reduced to a minimum value (VIN – VOUT ≤ 3.6 V).
HIGHLOWThe device is active in forced pass-through mode. The device supply current is approximately 15 μA typ.
HIGHHIGHThe device is active in auto mode (dc/dc boost, pass-through). The device supply current is approximately
load current capability is limited (up to ca. 250 mA).
The device shutdown current is approximately 8.5 μA typ.
from the battery. The device is short-circuit protected by a current limit of ca. 7300 mA.
50 μA typ. from the battery.
J6: GPIO/PG, General Purpose In/Out and Power Good
This pin can either be configured as a input (mode selection) or as dual role input/open-drain output
(nRST/nFAULT) pin. Per default, the pin is configured as nRST/nFAULT input/output.
Pin GPIO/PG is connected to HIGH per default. This pin is tied to VIN via pull-Up resistor R5.
SLVU955A–December 2013–Revised June 2014TPS61280-585 Evaluation Module
This header enables the possibility to apply the onboard pull-Up resistor R3 as well as to track the I²C
Clock signal on pin 2.
Placing a jumper across pins 1 and 2 ties SCL via resistor R3 to VIN. Per default, the USB-to-GPIO
Interface Adapter has a Pull-Up resistor applied. Therefore this Jumper is not fitted.
J8: SDA Pull-Up Resistor
This header enables the possibility to apply the onboard pull-Up resistor R4 as well as to track the I²C
Data signal on pin 2.
Placing a jumper across pins 1 and 2 ties SDA via resistor R4 to VIN. Per default, the USB-to-GPIO
Interface Adapter has a Pull-Up resistor applied. Therefore, this jumper is not fitted.
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6
TPS61280-585 Evaluation ModuleSLVU955A–December 2013–Revised June 2014
Figure 2 through Figure 6 show the design of the TPS61280EVM-585 PCBs. The EVM has been designed
using a four-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 can offer additional size reduction for spaceconstrained systems.
All layers are viewed from top side.
TPS61280EVM Assembly Drawings and Layout
Figure 2. TPS61280EVM-585 Component Placement
Figure 3. TPS61280EVM-585 Top Copper
SLVU955A–December 2013–Revised June 2014TPS61280-585 Evaluation Module
The software is available at the TI.com website (SLVC543).
Download and unzip the file. Run setup.msi and follow the instructions appearing during the installation.
After the installation is completed, run the software by going to:
START -> All Programs -> Texas Instruments -> TPS61280 EVM -> TPS61280 EVM
Interface Hardware Setup
Connect the USB-to-GPIO adapter to your PC using the supplied USB cable. Connect the TPS61280EVM
connector J9 to the USB-to-GPIO adapter using the supplied 10-pin ribbon cable. The connectors on the
ribbon cable are keyed to prevent incorrect installation.
Figure 7 shows a quick adapter connection overview.
Figure 7. Quick Connection Overview
User Interface Operation
SLVU955A–December 2013–Revised June 2014TPS61280-585 Evaluation Module
This section in the left, upper region reflects the User Control Registers. Here all adjustments can be done
on the user level.
5.0.1Status Section
This section located in the left, lower region reflects the Status Register of the device.
Register View
The right part of the Interface shows a register-wise view of all parameters. This section reflects the
settings displayed in the left part as described in Section 5.0.1.
Here single registers can be read, or written to the device (if applicable).
Hardware Pull-Up Resistor Selection
Clicking on the SETUP Button in the top, a Pull-Up Resistor selection appears. Here the internal resistors
of the USB-to-GPIO interface can be switched ON/OFF. The status is displayed in the status bar.
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TPS61280-585 Evaluation ModuleSLVU955A–December 2013–Revised June 2014
Changes from Original (December 2013) to A Revision ................................................................................................ Page
•Added support for the A-version device. ............................................................................................... 1
•Changed TPS61280 to TPS61280A in the bill of materials.......................................................................... 9
SLVU955A–December 2013–Revised June 2014Revision History
ADDITIONAL TERMS AND CONDITIONS, WARNINGS, RESTRICTIONS, AND DISCLAIMERS FOR
EVALUATION MODULES
Texas Instruments Incorporated (TI) markets, sells, and loans all evaluation boards, kits, and/or modules (EVMs) pursuant to, and user
expressly acknowledges, represents, and agrees, and takes sole responsibility and risk with respect to, the following:
1. User agrees and acknowledges that EVMs are intended to be handled and used for feasibility evaluation only in laboratory and/or
development environments. Notwithstanding the foregoing, in certain instances, TI makes certain EVMs available to users that do not
handle and use EVMs solely for feasibility evaluation only in laboratory and/or development environments, but may use EVMs in a
hobbyist environment. All EVMs made available to hobbyist users are FCC certified, as applicable. Hobbyist users acknowledge, agree,
and shall comply with all applicable terms, conditions, warnings, and restrictions in this document and are subject to the disclaimer and
indemnity provisions included in this document.
2. Unless otherwise indicated, EVMs are not finished products and not intended for consumer use. EVMs are intended solely for use by
technically qualified electronics experts who are familiar with the dangers and application risks associated with handling electrical
mechanical components, systems, and subsystems.
3. User agrees that EVMs shall not be used as, or incorporated into, all or any part of a finished product.
4. User agrees and acknowledges that certain EVMs may not be designed or manufactured by TI.
5. User must read the user's guide and all other documentation accompanying EVMs, including without limitation any warning or
restriction notices, prior to handling and/or using EVMs. Such notices contain important safety information related to, for example,
temperatures and voltages. For additional information on TI's environmental and/or safety programs, please visit www.ti.com/esh or
contact TI.
6. User assumes all responsibility, obligation, and any corresponding liability for proper and safe handling and use of EVMs.
7. Should any EVM not meet the specifications indicated in the user’s guide or other documentation accompanying such EVM, the EVM
may be returned to TI within 30 days from the date of delivery for a full refund. THE FOREGOING LIMITED WARRANTY IS THE
EXCLUSIVE WARRANTY MADE BY TI TO USER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR
STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. TI SHALL
NOT BE LIABLE TO USER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES RELATED TO THE
HANDLING OR USE OF ANY EVM.
8. 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 EVMs might be or are used. TI currently deals with a variety of customers, and therefore TI’s 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 with respect to the handling or use of EVMs.
9. User assumes sole responsibility to determine whether EVMs may be subject to any applicable federal, state, or local laws and
regulatory requirements (including but not limited to U.S. Food and Drug Administration regulations, if applicable) related to its handling
and use of EVMs and, if applicable, compliance in all respects with such laws and regulations.
10. User has sole responsibility to ensure the safety of any activities to be conducted by it and its employees, affiliates, contractors or
designees, with respect to handling and using EVMs. Further, user is responsible to ensure that any interfaces (electronic and/or
mechanical) between EVMs and any human body are designed with suitable isolation and means to safely limit accessible leakage
currents to minimize the risk of electrical shock hazard.
11. User shall employ reasonable safeguards to ensure that user’s use of EVMs will not result in any property damage, injury or death,
even if EVMs should fail to perform as described or expected.
12. User shall be solely responsible for proper disposal and recycling of EVMs consistent with all applicable federal, state, and local
requirements.
Certain Instructions. User shall operate EVMs within TI’s recommended specifications and environmental considerations per the user’s
guide, accompanying documentation, and any other applicable requirements. Exceeding the specified ratings (including but not limited to
input and output voltage, current, power, and environmental ranges) for EVMs may cause property damage, personal injury or death. If
there are questions concerning these ratings, user should contact a TI field representative prior to connecting interface electronics including
input power and intended loads. Any loads applied outside of the specified output range may result in unintended and/or inaccurate
operation and/or possible permanent damage to the EVM and/or interface electronics. Please consult the applicable 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 as long as the input and output are maintained
at a normal ambient operating temperature. These components include but are not limited to linear regulators, switching transistors, pass
transistors, and current sense resistors which can be identified using EVMs’ schematics located in the applicable EVM user's guide. When
placing measurement probes near EVMs during normal operation, please be aware that EVMs may become very warm. As with all
electronic evaluation tools, only qualified personnel knowledgeable in electronic measurement and diagnostics normally found in
development environments should use EVMs.
Agreement to Defend, Indemnify and Hold Harmless. User agrees to defend, indemnify, and hold TI, its directors, officers, employees,
agents, representatives, affiliates, licensors and their representatives harmless from and against any and all claims, damages, losses,
expenses, costs and liabilities (collectively, "Claims") arising out of, or in connection with, any handling and/or use of EVMs. User’s
indemnity shall apply whether Claims arise under law of tort or contract or any other legal theory, and even if EVMs fail to perform as
described or expected.
Safety-Critical or Life-Critical Applications. If user intends to use EVMs in evaluations of safety critical applications (such as life support),
and a failure of a TI product considered for purchase by user for use in user’s product would reasonably be expected to cause severe
personal injury or death such as devices which are classified as FDA Class III or similar classification, then user must specifically notify TI
of such intent and enter into a separate Assurance and Indemnity Agreement.
Page 13
RADIO FREQUENCY REGULATORY COMPLIANCE INFORMATION FOR EVALUATION MODULES
Texas Instruments Incorporated (TI) evaluation boards, kits, and/or modules (EVMs) and/or accompanying hardware that is marketed, sold,
or loaned to users may or may not be subject to radio frequency regulations in specific countries.
General Statement for EVMs Not Including a Radio
For EVMs not including a radio and not subject to the U.S. Federal Communications Commission (FCC) or Industry Canada (IC)
regulations, TI intends EVMs to be used only for engineering development, demonstration, or evaluation purposes. EVMs are not finished
products typically fit for general consumer use. EVMs may nonetheless generate, use, or radiate radio frequency energy, but have not been
tested for compliance with the limits of computing devices pursuant to part 15 of FCC or the ICES-003 rules. Operation of such EVMs 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.
General Statement for EVMs including a radio
User Power/Frequency Use Obligations: For EVMs including a radio, the radio included in such EVMs is intended for development and/or
professional use only in legally allocated frequency and power limits. Any use of radio frequencies and/or power availability in such EVMs
and their development application(s) must comply with local laws governing radio spectrum allocation and power limits for such EVMs. It is
the user’s sole responsibility to only operate this radio in legally acceptable frequency space and within legally mandated power limitations.
Any exceptions to this are strictly prohibited and unauthorized by TI unless user has obtained appropriate experimental and/or development
licenses from local regulatory authorities, which is the sole responsibility of the user, including its acceptable authorization.
U.S. Federal Communications Commission Compliance
For EVMs Annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant
Caution
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Changes or modifications could void the user's authority to operate the equipment.
FCC Interference Statement for Class A EVM devices
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to
cause harmful interference in which case the user will be required to correct the interference at its own expense.
FCC Interference Statement for Class B EVM devices
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment
generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
Industry Canada Compliance (English)
For EVMs Annotated as IC – INDUSTRY CANADA Compliant:
This Class A or B digital apparatus complies with Canadian ICES-003.
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the
equipment.
Concerning EVMs Including Radio Transmitters
This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this
device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired
operation of the device.
Concerning EVMs Including Detachable Antennas
Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain
approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should
be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication.
This radio transmitter has been approved by Industry Canada to operate with the antenna types listed in the user guide with the maximum
permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain
greater than the maximum gain indicated for that type, are strictly prohibited for use with this device.
Page 14
Canada Industry Canada Compliance (French)
Cet appareil numérique de la classe A ou B est conforme à la norme NMB-003 du Canada
Les changements ou les modifications pas expressément approuvés par la partie responsable de la conformité ont pu vider l’autorité de
l'utilisateur pour actionner l'équipement.
Concernant les EVMs avec appareils radio
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est
autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout
brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.
Concernant les EVMs avec antennes détachables
Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain
maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à
l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente
(p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante.
Le présent émetteur radio a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés dans le manuel
d’usage et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne non inclus dans
cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur.
Important Notice for Users of EVMs Considered “Radio Frequency Products” in Japan
EVMs entering Japan are NOT certified by TI as conforming to Technical Regulations of Radio Law of Japan.
If user uses EVMs in Japan, user is required by Radio Law of Japan to follow the instructions below with respect to EVMs:
1. Use EVMs in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and
Communications on March 28, 2006, based on Sub-section 1.1 of Article 6 of the Ministry’s Rule for Enforcement of Radio Law of
Japan,
2. Use EVMs only after user obtains the license of Test Radio Station as provided in Radio Law of Japan with respect to EVMs, or
3. Use of EVMs only after user obtains the Technical Regulations Conformity Certification as provided in Radio Law of Japan with respect
to EVMs. Also, do not transfer EVMs, unless user gives the same notice above to the transferee. Please note that if user does not
follow the instructions above, user will be subject to penalties of Radio Law of Japan.
(address) 24-1, Nishi-Shinjuku 6 chome, Shinjuku-ku, Tokyo, Japan
Page 15
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