Texas Instruments TPS7B8401EVM User manual

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TPS7B8401EVM Evaluation Module
User's Guide
SBVU060A–March 2020–Revised April 2020
TPS7B8401EVM Evaluation Module
Figure 1. TPS7B8401EVM Evaluation Module
This user’s guide describes the operational use of the TPS7B8401EVM evaluation module (EVM) as a
reference design for engineering demonstration and evaluation of the TPS7B8401 low-dropout (LDO)
linear regulator. Included in this user’s guide are setup and operating instructions, thermal and layout
guidelines, a printed circuit board (PCB) layout, a schematic diagram, and a bill of materials (BOM).
Contents
1 Introduction ................................................................................................................... 2
2 PCB Layout................................................................................................................... 4
3 Bill of Materials............................................................................................................... 6
List of Figures
1 TPS7B8401EVM Evaluation Module...................................................................................... 1
2 Assembly Layer.............................................................................................................. 4
3 Top Layer Routing........................................................................................................... 4
4 First Middle Layer............................................................................................................ 4
5 Second Middle Layer........................................................................................................ 4
6 Bottom Layer Routing....................................................................................................... 5
List of Tables
1 TPS7B8401EVM BOM ..................................................................................................... 6

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All trademarks are the property of their respective owners.
1 Introduction
TI's TPS7B8401EVM helps design engineers evaluate the operation and performance of the TPS7B8401
family of linear regulators for possible use in their own circuit application. This particular EVM
configuration contains a single wide-input voltage, small size, linear regulator for a wide range of
applications. The regulator is capable of delivering up to 150 mA to the load with low VIN to VOUT dropout
voltage. For stability, use a minimum derated capacitance of 1-µF (or larger) output capacitor.
1.1 Before You Begin
The following warnings and cautions are noted for the safety of anyone using or working close to the
TPS7B8401EVM. Observe all safety precautions.
WARNING
Hot surface. Contact may cause burns. Do not touch.
CAUTION
The circuit module can be damaged by overtemperature. To avoid damage,
monitor the temperature during evaluation and provide cooling, as needed, for
your system environment.
CAUTION
Some power supplies can be damaged by application of external voltages. If
you are using more than one power supply, check your equipment
requirements and use blocking diodes or other isolation techniques, as needed,
to prevent damage to your equipment.
CAUTION
The circuit module is not a finished product or electrical appliance. The module
does not contain current or voltage thresholds for circuit protection. It must be
used by qualified personnel with additional equipment for evaluation only.

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1.2 Inputs/Outputs Connectors and Jumper Descriptions
1.2.1 J1 – OUT_S
Regulated output voltage sense.
1.2.2 J2 – OUT
Regulated output power supply voltage screw terminal.
1.2.3 J3 – IN
Input voltage banana connector.
1.2.4 J4 – IN_S
Input voltage sense.
1.2.5 J5 –IN_ST
Input supply voltage screw terminal. Twist together the positive input lead and ground return lead from the
input power supply, and keep them as short as possible to minimize input inductance.
1.2.6 J6 – EN
Output voltage enable. To enable the output voltage, connect the jumper to short VI to EN.
1.2.7 J7 – OUT
Regulated output voltage banana connector.
1.2.8 J8 – GND
Input supply ground return banana connector.
1.2.9 J9 – GND
Regulated output voltage return banana connector.
1.2.10 J10 – Setpoint Selection
Use the jumper to short the correct resistor to GND for the desired output voltage.
1.2.11 J11 – Test Hookup
Intended for test purposes only.
1.2.12 TP1 – IN
Input voltage test point.
1.2.13 TP2 – OUT
Regulated output voltage test point.
1.2.14 TP3 – GND
Ground test point.

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1.2.15 TP4 – GND
Ground test point.
1.2.16 TP5 – GND
Ground test point.
1.2.17 TP6 – SO
Bode plot measurement test point.
1.2.18 TP7 – PG
Bode plot measurement test point.
1.3 Soldering Guidelines
To avoid damaging the integrated circuit (IC), use a hot-air system for any solder rework to modify the
EVM for the purpose of repair or other application reasons.
1.4 Equipment Connection
Connect the equipment as shown in the following steps:
1. Set the input power supply up to 40 V (max), and turn them off.
2. Connect the positive voltage lead from the input power supply to VIN at the J3 connector of the EVM.
3. Connect the ground lead from the input power supply to GND at the J8 connector of the EVM.
4. Connect a 0-A to 150-mA load between VOUT and GND.
5. Disable output voltage by connecting J6 pin 2 (EN) to J6 pin 1 (GND).
2 PCB Layout
Figure 2 to Figure 6 illustrate the PCB layout for this EVM.
Figure 2. Assembly Layer Figure 3. Top Layer Routing

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Figure 4. First Middle Layer Figure 5. Second Middle Layer
Figure 6. Bottom Layer Routing

Bill of Materials www.ti.com
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3 Bill of Materials
Table 1 shows the BOM for this EVM.
(1) These assemblies are ESD sensitive, observe ESD precautions.
(2) These assemblies must be clean and free from flux and all contaminants. Use of no-clean flux is not acceptable.
(3) These assemblies must comply with workmanship standards IPC-A-610 Class 2.
(4) Unless otherwise noted in the Alternate Part Number or Alternate Manufacturer columns, all parts can be substituted with equivalents.
Table 1. TPS7B8401EVM BOM(1)(2)(3)(4)
Designator Quantity Value Description Package Reference Part Number Manufacturer Alternate Part
Number Alternate Manufacturer
!PCB1 1 Printed Circuit Board LP036A Any
C3 1 1 µF CAP, CERM, 1 µF, 100 V, ±10%, X7R, 1210 1210 GRM32CR72A105KA35L MuRata
C6 1 10 µF CAP, CERM, 10 µF, 50 V, ±10%, X7R, 1210 1210 GRM32ER71H106KA12L MuRata
C8 1 0.01 µF CAP, CERM, 0.01 µF, 100 V,±10%, X7R,
0603 0603 885012206114 Wurth Elektronik
H9, H10, H11, H12 4 Bumpon, Hemisphere, 0.44 × 0.20, Clear Transparent Bumpon SJ-5303 (CLEAR) 3M
J3, J7 2 Standard Banana Jack, Insulated, Red 6091 6091 Keystone
J6 1 Header, 2.54 mm, 3 × 1, Gold, SMT Header, 2.54 mm, 3 × 1,
SMT TSM-103-01-L-SV-P-TR Samtec
J8, J9 2 Standard Banana Jack, Insulated, Black 6092 6092 Keystone
J11 1 Header, 2.54 mm, 5 × 2, Gold, TH Header, 2.54 mm, 5 × 2,
TH 61301021121 Wurth Elektronik
R1 1 42.2 k RES, 42.2 k, 1%, 0.1 W, AEC-Q200 Grade 0,
0603 0603 CRCW060342K2FKEA Vishay-Dale
R2 1 0 RES, 0, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 RMCF0603ZT0R00 Stackpole
Electronics Inc
R3 1 10.5 k RES, 10.5 k, 1%, 0.1 W, 0603 0603 RC0603FR-0710K5L Yageo
R4 1 6.34 k RES, 6.34 k, 1%, 0.1 W, 0603 0603 RC0603FR-076K34L Yageo
R5 1 3.74 k RES, 3.74 k, 1%, 0.1 W, 0603 0603 RC0603FR-073K74L Yageo
R6 1 3.32 k RES, 3.32 k, 1%, 0.1 W, 0603 0603 RC0603FR-073K32L Yageo
R7 1 1.91 k RES, 1.91 k, 1%, 0.1 W, 0603 0603 RC0603FR-071K91L Yageo
SH-J1, SH-J2 2 1 × 2 Shunt, 100 mil, Gold plated, Black Shunt SNT-100-BK-G Samtec 969102-0000-DA 3M
TP1, TP2, TP3, TP4,
TP5, TP6, TP7 7 Test Point, Compact, SMT Testpoint_Keystone_Co mpact 5016 Keystone
U1 1 150-mA, off-battery, low IQ, low-dropout
regulator VSON8 TPS7B8401QWDRBRQ1 Texas Instruments
C1 0 100 µF CAP, AL, 100 µF, 100 V, ±20%, 0.17 ohm,
AEC-Q200 Grade 2, SMD SMT Radial J16 EEV-FK2A101M Panasonic
C2, C4 0 47 µF CAP, TA, 47 µF, 50 V, ±10%, 0.24 ohm, SMD 6.2 × 6 mm 597D476X9050Z2T Vishay-Sprague
C5 0 100 µF CAP, AL, 100 µF, 35 V, ±20%, 0.2 ohm, AEC-
Q200 Grade 1, SMD D8xL10.2 mm EEE-TC1V101P Panasonic
C7 0 22 µF CAP, CERM, 22 µF, 50 V, ±20%, X7R,
Stacked 2220 Stacked 2220 KCM55WR71H226MH01K MuRata

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Table 1. TPS7B8401EVM BOM(1)(2)(3)(4) (continued)
Designator Quantity Value Description Package Reference Part Number Manufacturer Alternate Part
Number Alternate Manufacturer
FID1, FID2, FID3 0 Fiducial mark. There is nothing to buy or
mount. N/A N/A N/A
H1, H2, H3, H4 0 Machine Screw, Round, #4-40 × 1/4, Nylon,
Philips panhead Screw NY PMS 440 0025 PH B&F Fastener Supply
H5, H6, H7, H8 0 Standoff, Hex, 0.5"L #4-40 Nylon Standoff 1902C Keystone
J1, J4 0 SMA Straight Jack, Gold, 50 Ohm, TH SMA Straight Jack, TH 901-144-8RFX Amphenol RF
J2, J5 0 Terminal Block, 5 mm, 2 × 1, Tin, TH Terminal Block, 5 mm, 2
× 1, TH 691 101 710 002 Wurth Elektronik
J10 0 Header, 2.54 mm, 5 × 2, Gold, TH Header, 2.54 mm, 5 × 2,
TH 61301021121 Wurth Elektronik

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Revision History
Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (March 2020) to A Revision ....................................................................................................... Page
• Changed TPS7B84EVM-036 to TPS7B8401EVM throughout the document. .................................................... 1

STANDARD TERMS FOR EVALUATION MODULES
1. Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or
documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance
with the terms set forth herein. User's acceptance of the EVM is expressly subject to the following terms.
1.1 EVMs are intended solely for product or software developers for use in a research and development setting to facilitate feasibility
evaluation, experimentation, or scientific analysis of TI semiconductors products. EVMs have no direct function and are not
finished products. EVMs shall not be directly or indirectly assembled as a part or subassembly in any finished product. For
clarification, any software or software tools provided with the EVM (“Software”) shall not be subject to the terms and conditions
set forth herein but rather shall be subject to the applicable terms that accompany such Software
1.2 EVMs are not intended for consumer or household use. EVMs may not be sold, sublicensed, leased, rented, loaned, assigned,
or otherwise distributed for commercial purposes by Users, in whole or in part, or used in any finished product or production
system.
2Limited Warranty and Related Remedies/Disclaimers:
2.1 These terms do not apply to Software. The warranty, if any, for Software is covered in the applicable Software License
Agreement.
2.2 TI warrants that the TI EVM will conform to TI's published specifications for ninety (90) days after the date TI delivers such EVM
to User. Notwithstanding the foregoing, TI shall not be liable for a nonconforming EVM if (a) the nonconformity was caused by
neglect, misuse or mistreatment by an entity other than TI, including improper installation or testing, or for any EVMs that have
been altered or modified in any way by an entity other than TI, (b) the nonconformity resulted from User's design, specifications
or instructions for such EVMs or improper system design, or (c) User has not paid on time. Testing and other quality control
techniques are used to the extent TI deems necessary. TI does not test all parameters of each EVM.
User's claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects in the EVMs within ten (10)
business days after delivery, or of any hidden defects with ten (10) business days after the defect has been detected.
2.3 TI's sole liability shall be at its option to repair or replace EVMs that fail to conform to the warranty set forth above, or credit
User's account for such EVM. TI's liability under this warranty shall be limited to EVMs that are returned during the warranty
period to the address designated by TI and that are determined by TI not to conform to such warranty. If TI elects to repair or
replace such EVM, TI shall have a reasonable time to repair such EVM or provide replacements. Repaired EVMs shall be
warranted for the remainder of the original warranty period. Replaced EVMs shall be warranted for a new full ninety (90) day
warranty period.
WARNING
Evaluation Kits are intended solely for use by technically qualified,
professional electronics experts who are familiar with the dangers
and application risks associated with handling electrical mechanical
components, systems, and subsystems.
User shall operate the Evaluation Kit within TI’s recommended
guidelines and any applicable legal or environmental requirements
as well as reasonable and customary safeguards. Failure to set up
and/or operate the Evaluation Kit within TI’s recommended
guidelines may result in personal injury or death or property
damage. Proper set up entails following TI’s instructions for
electrical ratings of interface circuits such as input, output and
electrical loads.
NOTE:
EXPOSURE TO ELECTROSTATIC DISCHARGE (ESD) MAY CAUSE DEGREDATION OR FAILURE OF THE EVALUATION
KIT; TI RECOMMENDS STORAGE OF THE EVALUATION KIT IN A PROTECTIVE ESD BAG.

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2
3Regulatory Notices:
3.1 United States
3.1.1 Notice applicable to EVMs not FCC-Approved:
FCC NOTICE: This kit is designed to allow product developers to evaluate electronic components, circuitry, or software
associated with the kit to determine whether to incorporate such items in a finished product and software developers to write
software applications for use with the end product. This kit is not a finished product and when assembled may not be resold or
otherwise marketed unless all required FCC equipment authorizations are first obtained. Operation is subject to the condition
that this product not cause harmful interference to licensed radio stations and that this product accept harmful interference.
Unless the assembled kit is designed to operate under part 15, part 18 or part 95 of this chapter, the operator of the kit must
operate under the authority of an FCC license holder or must secure an experimental authorization under part 5 of this chapter.
3.1.2 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
NOTE: 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
NOTE: 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.
3.2 Canada
3.2.1 For EVMs issued with an Industry Canada Certificate of Conformance to RSS-210 or RSS-247
Concerning EVMs Including Radio Transmitters:
This device complies with Industry Canada license-exempt RSSs. 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.
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.
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.