User's Guide
SLVU659A–March 2012–Revised March 2012
TPS62125EVM-044 Evaluation Module
This user’s guide describes the characteristics, operation, and use of the Texas Instruments TPS62125
evaluation module (EVM). This EVM is designed to help the user easily evaluate and test the operation
and functionality of the TPS62125. The EVM converts a 4-V to 17-V input voltage to a regulated 3.3-V
output voltage that delivers 300 mA. This user’s guide includes setup instructions for the hardware,
printed-circuit board layouts for the EVM, a schematic diagram, a bill of materials, and test results for the
EVM.
Contents
1 Introduction .................................................................................................................. 2
2 Setup ......................................................................................................................... 2
3 TPS62125EVM-044 Test Results ......................................................................................... 3
4 Board Layout ................................................................................................................ 9
5 Schematic and Bill of Materials .......................................................................................... 11
List of Figures
1 Efficiency (R1, R2, and R3 not installed. JP1 connected between ON and EN.) .................................. 3
2 Load Regulation............................................................................................................. 4
3 Line Regulation With Iout = 250 mA...................................................................................... 4
4 Loop Response With Vin = 12 V and Iout = 250 mA................................................................... 4
5 Input Voltage Ripple With Vin = 12 V and Iout = 250 mA ............................................................. 5
6 Output Voltage Ripple With Vin = 12 V and Iout = 250 mA ........................................................... 5
7 Load Transient Response With Vin = 12 V.............................................................................. 6
8 Start-Up on Vin With 250-mA Load....................................................................................... 6
9 Start-Up on EN With 250-mA Load....................................................................................... 7
10 Shutdown on EN With 250-mA Load..................................................................................... 7
11 Prebias Start-Up and Shutdown on EN With 250-mA Load........................................................... 8
12 Thermal Performance With Vin = 12 V and Iout = 250 mA ........................................................... 8
13 Top Silk Layer............................................................................................................... 9
14 Top Layer .................................................................................................................... 9
15 Bottom Layer............................................................................................................... 10
16 Top Assembly Layer ...................................................................................................... 10
17 TPS62125EVM-044 Schematic.......................................................................................... 11
List of Tables
1 Performance Specification Summary..................................................................................... 2
2 TPS62125EVM-044 Bill of Materials.................................................................................... 12
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Introduction
1 Introduction
The TPS62125 is a 300-mA, synchronous, step-down converter in a 2x2-mm, 8-pin WSON package.
1.1 Background
The TPS62125EVM-044 (PWR044) uses the TPS62125 device and is set to a 3.3-V output. The EVM
operates with full-rated performance with an input voltage between 4 V and 17 V, assuming JP1 is
connected between ON and EN.
The TPS62125 device contains an adjustable enable threshold and adjustable hysteresis feature. Thus,
the input voltage at which the device enables and disables is fully programmable by the user. In the
TPS62125EVM-044, the device is set to turn on at 6 V and turn off at 4 V. This feature can be bypassed
by using jumper JP1, which overrides the programmed threshold voltages.
1.2 Performance Specification
Table 1 provides a summary of the TPS62125EVM-044 performance specifications. All specifications are
given for an ambient temperature of 25°C.
Table 1. Performance Specification Summary
Specification Test Conditions Min Typ Max Unit
Input voltage JP1 connected between EN and ON 4 17 V
Output voltage PWM Mode of Operation 3.3 V
Output current 0 300 mA
Peak efficiency 93.3%
Soft-start time Ramp time of the output voltage 330 µs
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1.3 Modifications
The printed-circuit board (PCB) for this EVM accommodates additional input and output capacitors, as well
as a feedforward capacitor.
1.3.1 Input and Output Capacitors
C3 is provided for an additional input capacitor. This capacitor is not required for proper operation but can
be used to reduce the input voltage ripple.
C4 is provided for an additional output capacitor. This capacitor is not required for proper operation but
can be used to reduce the output voltage ripple and to improve the load transient response. The total
output capacitance must remain within the recommended range in the data sheet for proper operation.
1.3.2 Feedforward Capacitor
C6 is provided for a feedforward capacitor. This capacitor is not required for proper operation but can be
used to improve the transient response. Typically, using a 22-pF feedforward capacitor reduces or
eliminates any output voltage overshoot that may occur at start-up. C6 is located on the back side of the
PCB.
2 Setup
This section describes how to properly use the TPS62125EVM-044.
2.1 Input/Output Connector Descriptions
2
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0.01 0.1 1 10 100 1000
Load Current (mA)
0
10
20
30
40
50
60
70
80
90
100
Efficiency (%)
V = 12 V
IN
V = 17 V
IN
V = 5 V
IN
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J1 – VIN Positive input connection from the input supply for the EVM.
J2 – S+/S- Input voltage sense connections. Measure the input voltage at this point.
J3 – GND Return connection from the input supply for the EVM.
J4 – VOUT Output voltage connection.
J5 – S+/S- Output voltage sense connections. Measure the output voltage at this point.
J6 – GND Output return connection.
J7 – PG/GND The PG output appears on pin 1 of this header with a convenient ground on pin 2.
JP1 – EN EN pin input jumper. Place the supplied jumper across ON and EN to turn on the IC.
Place the jumper across OFF and EN to turn off the IC. Do not install the supplied
jumper to utilize the adjustable enable threshold voltage feature of the IC.
JP2 – PG PG pin pullup voltage jumper. Place the supplied jumper on JP2 to connect the PG pin
Pullup Voltage pullup resistor to Vout. Alternatively, the jumper can be removed and a different
voltage can be supplied on pin 1 to pull up the PG pin to a different level. This
externally applied voltage must remain below 12 V.
2.2 Setup
To operate the EVM, set jumpers JP1 through JP2 to the desired positions per Section 2.1. Connect the
input supply to J1 and J3 and connect the load to J4 and J6.
3 TPS62125EVM-044 Test Results
TPS62125EVM-044 Test Results
This section provides test results of the TPS62125EVM-044.
Figure 1. Efficiency (R1, R2, and R3 not installed. JP1 connected between ON and EN.)
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0
0.2
0.4
0.6
0.8
1
1.2
1.4
0.01 0.1 1 10 100 1000
Load Current (mA)
Load Regulation (%)
V = 5 V
IN
V = 12 V
IN
V = 17 V
IN
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
4 5 6 7 8 9 10 11 12 13 14 15 16 17
Line Regulation (%)
V - Input Voltage - (V)
I
-180
-150
-120
-90
-60
30
0
30
60
90
120
150
180
Phase - deg
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
Gain - dB
100 1k 10k 100k 1M
Frequency - Hz
Phase
Gain
TPS62125EVM-044 Test Results
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Figure 2. Load Regulation
4
TPS62125EVM-044 Evaluation Module SLVU659A–March 2012–Revised March 2012
Figure 4. Loop Response With Vin = 12 V and Iout = 250 mA
Figure 3. Line Regulation With Iout = 250 mA
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SW 5 V/div
lind 200 mA/div
Vin (AC Coupled) 20 mV/div
t - Time - 500 ns/div
Vout (AC Coupled) 20 mV/div
lind 200 mA/div
SW 5 V/div
t - Time - 500 ns/div
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TPS62125EVM-044 Test Results
Figure 5. Input Voltage Ripple With Vin = 12 V and Iout = 250 mA
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Figure 6. Output Voltage Ripple With Vin = 12 V and Iout = 250 mA
5
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Iout 100 mA/div
(150 mA to 250 mA Load Step)
t - Time - 5 s/divm
Vout (AC Coupled) 20 mV/div
EN 2 V/div
t - Time - 100 s/divm
Vin 5 V/div
Vout 1 V/div
PG 2 V/div
TPS62125EVM-044 Test Results
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Figure 7. Load Transient Response With Vin = 12 V
6
TPS62125EVM-044 Evaluation Module SLVU659A–March 2012–Revised March 2012
Figure 8. Start-Up on Vin With 250-mA Load
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t - Time - 100 s/divm
EN 2 V/div
Vout 1 V/div
PG 2 V/div
Vin 5 V/div
Vin 5 V/div
EN 2 V/div
Vout 1 V/div
PG 2 V/div
t - Time - 100 s/divm
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TPS62125EVM-044 Test Results
Figure 9. Start-Up on EN With 250-mA Load
Figure 10. Shutdown on EN With 250-mA Load
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t - Time - 200 s/divm
Vin 5 V/div
EN 2 V/div
Vout 1 V/div
PG 2 V/div
1.5 V pre-bias
TPS62125EVM-044 Test Results
Figure 11. Prebias Start-Up and Shutdown on EN With 250-mA Load
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Figure 12. Thermal Performance With Vin = 12 V and Iout = 250 mA
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4 Board Layout
This section provides the TPS62125EVM-044 board layout and illustrations.
Board Layout
Figure 13. Top Silk Layer
Figure 14. Top Layer
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Board Layout
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Figure 15. Bottom Layer
10
Figure 16. Top Assembly Layer
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VIN
GND
S+
S-
OFF
GND
GND
VOUT
3.3V
S+
S-
PG
EN
300 mA max
ON
1
Not Installed
1
1
1
1
1
2
J1
1
2
J2
1
2
J3
1
2
J4
1
2
J5
1
2
J6
C1
10uF
R1
1.80M
R2
442k
R3
274k
R4
1.80M
R5
576k
R6
100k
1
2
J7
L1
15uH
1
GND
2
VIN
3
EN
4
EN_HYS
5
FB
6
VOS
7
SW
8
PG
9
ETPAD
U1
TPS62125DSG
1
2
JP2
+
C5
22uF
C2
10uF
C4
1
2
3
JP1
C3
C6
TP1
VIN
VIN
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5 Schematic and Bill of Materials
This section provides the TPS62125EVM-044 schematic and bill of materials.
5.1 Schematic
Schematic and Bill of Materials
Figure 17. TPS62125EVM-044 Schematic
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Schematic and Bill of Materials
5.2 Bill of Materials
Table 2. TPS62125EVM-044 Bill of Materials
Count RefDes Value Description Size Part Number MFR
1 C1 10 µF Capacitor, Ceramic, 25V, X5R, ±20% 0805 Std Std
1 C2 10 µF Capacitor, Ceramic, 16V, X5R, ±20% 0805 Std Std
1 C5 22 µF Capacitor, POSCAP, 20V, ±20% 3528[B] 20TQC22MYFB Sanyo
1 L1 15 µH Inductor, Power, 0.56 A, 275-mΩ, ±20% 3 X 2.5 mm VLF302515MT-150M TDK
2 R1, R4 1.8M Resistor, Chip, 1/16W, 1% 0603 Std Std
1 R2 442k Resistor, Chip, 1/16W, 1% 0603 Std Std
1 R3 274k Resistor, Chip, 1/16W, 1% 0603 Std Std
1 R5 576k Resistor, Chip, 1/16W, 1% 0603 Std Std
1 R6 100k Resistor, Chip, 1/16W, 1% 0603 Std Std
1 U1 TPS62125 IC, 3V-17V, 300mA Buck Converter with Adjustable Enable WSON-8 TPS62125DSG TI
The TPS62125EVM-044 may be populated with TPS62125 (U1) devices that do not contain the correct
top side markings on the top of the device itself. These devices are still fully tested TPS62125 devices and
meet the specified electrical characteristics in the datasheet.
Threshold and Hysteresis
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TPS62125EVM-044 Evaluation Module SLVU659A–March 2012–Revised March 2012
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EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS
Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions:
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims
arising from the handling or use of the goods.
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 LIMITED 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. 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.
Please read the User's Guide and, specifically, the Warnings and Restrictions notice in the User's Guide prior to handling the product. This
notice contains important safety information about temperatures and voltages. For additional information on TI's environmental and/or safety
programs, please visit www.ti.com/esh or contact TI.
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 such TI products or services might be or are used. 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.
REGULATORY COMPLIANCE INFORMATION
As noted in the EVM User’s Guide and/or EVM itself, this EVM and/or accompanying hardware may or may not be subject to the Federal
Communications Commission (FCC) and Industry Canada (IC) rules.
For EVMs not subject to the above rules, this evaluation board/kit/module 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 or ICES-003 rules, which are designed to provide reasonable protection against radio frequency
interference. Operation of the equipment 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: This radio is intended for development/professional use only in legally allocated frequency and
power limits. Any use of radio frequencies and/or power availability of this EVM and its development application(s) must comply with local
laws governing radio spectrum allocation and power limits for this evaluation module. 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 Texas Instruments unless user has obtained appropriate experimental/development licenses from local regulatory
authorities, which is responsibility of user including its acceptable authorization.
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 not expressly approved by the party responsible for compliance 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 his 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.
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.
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.
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【【Important Notice for Users of this Product in Japan】】
This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan
If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product:
1. Use this product 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 this product only after you obtained the license of Test Radio Station as provided in Radio Law of Japan with respect to this
product, or
3. Use of this product only after you obtained the Technical Regulations Conformity Certification as provided in Radio Law of Japan with
respect to this product. Also, please do not transfer this product, unless you give the same notice above to the transferee. Please note
that if you could not follow the instructions above, you will be subject to penalties of Radio Law of Japan.
(address) 24-1, Nishi-Shinjuku 6 chome, Shinjukku-ku, Tokyo, Japan
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【ご使用にあたっての注】
本開発キットは技術基準適合証明を受けておりません。
本製品のご使用に際しては、電波法遵守のため、以下のいずれかの措置を取っていただく必要がありますのでご注意ください。
1. 電波法施行規則第6条第1項第1号に基づく平成18年3月28日総務省告示第173号で定められた電波暗室等の試験設備でご使用いただく。
2. 実験局の免許を取得後ご使用いただく。
3. 技術基準適合証明を取得後ご使用いただく。
なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。
上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。
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Texas Instruments Japan Limited
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EVALUATION BOARD/KIT/MODULE (EVM)
WARNINGS, RESTRICTIONS AND DISCLAIMERS
For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished
electrical equipment and not intended for consumer use. It is intended solely for use for preliminary feasibility evaluation in
laboratory/development environments by technically qualified electronics experts who are familiar with the dangers and application risks
associated with handling electrical mechanical components, systems and subsystems. It should not be used as all or part of a finished end
product.
Your Sole Responsibility and Risk. You acknowledge, represent and agree that:
1. You have unique knowledge concerning Federal, State and local regulatory requirements (including but not limited to Food and Drug
Administration regulations, if applicable) which relate to your products and which relate to your use (and/or that of your employees,
affiliates, contractors or designees) of the EVM for evaluation, testing and other purposes.
2. You have full and exclusive responsibility to assure the safety and compliance of your products with all such laws and other applicable
regulatory requirements, and also to assure the safety of any activities to be conducted by you and/or your employees, affiliates,
contractors or designees, using the EVM. Further, you are responsible to assure that any interfaces (electronic and/or mechanical)
between the EVM 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.
3. You will employ reasonable safeguards to ensure that your use of the EVM will not result in any property damage, injury or death, even
if the EVM should fail to perform as described or expected.
4. You will take care of proper disposal and recycling of the EVM’s electronic components and packing materials.
Certain Instructions. It is important to operate this EVM within TI’s recommended specifications and environmental considerations per the
user guidelines. Exceeding the specified EVM ratings (including but not limited to input and output voltage, current, power, and
environmental ranges) may cause property damage, personal injury or death. If there are questions concerning these ratings please 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 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 the
EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during normal operation, please
be aware that these devices may be very warm to the touch. As with all electronic evaluation tools, only qualified personnel knowledgeable
in electronic measurement and diagnostics normally found in development environments should use these EVMs.
Agreement to Defend, Indemnify and Hold Harmless. You agree to defend, indemnify and hold TI, its 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 use of the EVM that is not in accordance with the terms of the agreement. This obligation shall apply whether Claims
arise under law of tort or contract or any other legal theory, and even if the EVM fails to perform as described or expected.
Safety-Critical or Life-Critical Applications. If you intend to evaluate the components for possible use in safety critical applications (such
as life support) where a failure of the TI 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 you must specifically notify TI of such intent and enter into a separate
Assurance and Indemnity Agreement.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2012, Texas Instruments Incorporated
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements,
and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should
obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are
sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard
warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where
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