Texas Instruments TLV751-EVM User manual

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TLV751-EVM Evaluation Module
User's Guide
SBVU057–December 2019
TLV751-EVM Evaluation Module
Figure 1. TLV751-EVM Evaluation Module
This user’s guide describes the operational use of the TLV751-EVM evaluation module (EVM) as a
reference design for engineering demonstration and evaluation of the TLV75101DSQ, a dual, high-
accuracy, adjustable linear regulator (LDO). 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).
Throughout this document, the terms demonstration kit,evaluation board, and evaluation module are
synonymous with the TLV751-EVM.
Table 1 lists the related documentation available through the Texas Instruments web site at www.ti.com.
Table 1. Related Documentation
DEVICE LITERATURE NUMBER
TLV751 SBVS385

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Contents
1 Introduction ................................................................................................................... 3
1.1 Before You Begin................................................................................................... 3
2 EVM Setup.................................................................................................................... 4
2.1 Inputs/Outputs Connectors and Jumper Descriptions ......................................................... 4
2.2 Soldering Guidelines ............................................................................................... 5
2.3 Equipment Connection............................................................................................. 6
3 Operation ..................................................................................................................... 6
4 PCB Layout................................................................................................................... 7
5 Schematic..................................................................................................................... 9
6 Bill of Materials ............................................................................................................. 10
List of Figures
1 TLV751-EVM Evaluation Module.......................................................................................... 1
2 Assembly Layer.............................................................................................................. 7
3 Top Layer Routing........................................................................................................... 7
4 First Middle Layer............................................................................................................ 7
5 Second Middle Layer........................................................................................................ 7
6 Bottom Layer Routing....................................................................................................... 7
7 TLV751-EVM Schematic.................................................................................................... 9
List of Tables
1 Related Documentation..................................................................................................... 1
2 TLV751-EVM BOM ........................................................................................................ 10
Trademarks
All trademarks are the property of their respective owners.

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1 Introduction
Texas Instruments' TLV751-EVM helps design engineers evaluate the operation and performance of the
TLV751 family of linear regulators for possible use in their own circuit application. This particular EVM
configuration contains a single high-accuracy, small size, dual-input linear regulator for a wide range of
applications. The regulator is capable of delivering up to 500 mA to the load for each input channel with
low VIN to VOUT dropout voltage. For stability, use a minimum derated capacitance of 0.47-µF (or larger)
output capacitor for each output channel.
1.1 Before You Begin
The following warnings and cautions are noted for the safety of anyone using or working close to the
TLV751-EVM. Observe all safety precautions.
Warning 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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2 EVM Setup
This section describes how to properly connect and set up the TLV751-EVM, including the jumpers and
connectors on the EVM board.
2.1 Inputs/Outputs Connectors and Jumper Descriptions
2.1.1 J1 – OUT1_S
Regulated output voltage one sense
2.1.2 J2 – IN1
Input power supply one voltage connector. Twist together the positive input lead and ground return lead
from the input power supply one, and keep them as short as possible to minimize input inductance.
2.1.3 J3 – OUT1
Regulated output voltage one connector
2.1.4 J4 – IN1_S
Input voltage one sense
2.1.5 J5 –GND
Input supply one ground return connector
2.1.6 J6 – GND
Regulated output voltage one ground return connector
2.1.7 J7 – IN2
Input power supply two voltage connector. Twist together the positive input lead and ground return lead
from the input power supply two, and keep them as short as possible to minimize input inductance.
2.1.8 J8 – OUT2
Regulated output voltage two connector
2.1.9 J9 – IN2_S
Input voltage two sense
2.1.10 J10 – GND
Input supply two ground return connector
2.1.11 J11 – EN1
Output voltage one enable. To enable output voltage one, connect a jumper to short VIN1 to EN1.
2.1.12 J12 – GND
Regulated output voltage two ground return connector
2.1.13 J13 – OUT2_S
Regulated output voltage two sense

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2.1.14 J14 – EN2
Output voltage two enable. To enable output voltage two, connect a jumper to short VIN2 to EN2.
2.1.15 J15 – OUT1 Set
For convenience, the EVM is prepopulated with four resistor divider options. Place a shunt on J15 next to
the schematic label of your desired output voltage one.
2.1.16 J16 – OUT2 Set
For convenience, the EVM is prepopulated with four resistor divider options. Place a shunt on J15 next to
the schematic label of your desired output voltage two.
2.1.17 J17 – Test Hookup
Intended for test purposes only
2.1.18 TP1 – OUT1_S
Regulated output voltage one test point
2.1.19 TP2 – IN1_S
Input voltage one test point
2.1.20 TP3 – OUT2_S
Regulated output voltage two test point
2.1.21 TP4 – IN2_S
Input voltage two test point
2.1.22 TP5 – EN1
Output voltage one enable test point
2.1.23 TP6 – EN2
Output voltage two enable test point
2.1.24 TP7 – GND
Ground test point
2.1.25 TP8 – GND
Ground test point
2.1.26 TP9 – GND
Ground test point
2.1.27 TP10 – GND
Ground test point
2.2 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.

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2.3 Equipment Connection
Connect the equipment as shown in the following steps:
1. Set the input power supplies one and two up to 6 V (max), and turn them off.
2. Connect the GND leads of both supplies together.
3. Connect the positive voltage lead from the input power supply one to IN1 at the J2 connector of the
EVM.
4. Connect the ground lead from the input power supplies one and two to GND at the J5 connector of the
EVM.
5. Connect the positive voltage lead from the input power supply two to IN2 at the J7 connector of the
EVM.
6. Connect the ground lead from the input power supplies one and two to GND at the J10 connector of
the EVM.
7. Connect a 0-A to 500-mA load between OUT1 and GND.
8. Connect a 0-A to 500-mA load between OUT2 and GND.
9. Disable output voltage one by floating J11.
10. Disable output voltage two by floating J14.
3 Operation
Operate the equipment using the following steps:
1. Turn on the power supplies.
2. Enable the outputs by jumping J11 (the EN1 pin) to VIN1 and J14 (the EN2 pin) to VIN2.
3. Vary the respective loads and input voltages, as necessary, for test purposes.

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4 PCB Layout
Figure 2 to Figure 6 illustrate the PCB layout for this EVM.
Figure 2. Assembly Layer Figure 3. Top Layer Routing
Figure 4. First Middle Layer Figure 5. Second Middle Layer

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Figure 6. Bottom Layer Routing

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5 Schematic
Figure 7 shows this schematic for the EVM.
Figure 7. TLV751-EVM Schematic

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6 Bill of Materials
Table 2 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 2. TLV751-EVM BOM(1)(2)(3)(4)
DESIGNATOR QTY VALUE DESCRIPTION PACKAGE REFERENCE PART NUMBER MANUFACTURER ALTERNATE PART
NUMBER
ALTERNATE
MANUFACTURER
!PCB1 1 Printed Circuit Board LP032 Any
C3, C4, C9, C10 4 1 µF CAP, CERM, 1 µF, 50 V, ±10%, X7R, 0805 0805 08055C105KAT2A AVX
J2, J3, J7, J8 4 Standard Banana Jack, Insulated, Red 6091 6091 Keystone
J5, J6, J10, J12 4 Standard Banana Jack, Insulated, Black 6092 6092 Keystone
J11, J14 2 Header, 2.54 mm, 2x1, Tin, SMT Header, 2.54 mm, 2x1, SMT TSM-102-03-T-SV Samtec
J15, J16 2 Header, 2.54 mm, 4x2, Gold, SMT Header, 2.54 mm, 4x2, SMT 61000821121 Wurth Elektronik
LBL1 1 Thermal Transfer Printable Labels, 0.650" W x 0.200" H - 10 000
per roll PCB Label 0.650 x 0.200 inch THT-14-423-10 Brady
R1, R2 2 48.7 k RES, 48.7 k, 1%, 0.125 W, AEC-Q200 Grade 0, 0805 0805 CRCW080548K7FKEA Vishay-Dale
R3, R5, R9, R12 4 13.7 k RES, 13.7 k, 1%, 0.125 W, AEC-Q200 Grade 0, 0805 0805 CRCW080513K7FKEA Vishay-Dale
R4, R8 2 21.5 k RES, 21.5 k, 1%, 0.125 W, AEC-Q200 Grade 0, 0805 0805 CRCW080521K5FKEA Vishay-Dale
R6, R10 2 9.76 k RES, 9.76 k, 1%, 0.125 W, AEC-Q200 Grade 0, 0805 0805 CRCW08059K76FKEA Vishay-Dale
R7, R11 2 6.04 k RES, 6.04 k, 1%, 0.125 W, AEC-Q200 Grade 0, 0805 0805 CRCW08056K04FKEA Vishay-Dale
SH-J1, SH-J2, SH-J3,
SH-J4 4 1x2 Shunt, 100 mil, Gold plated, Black Shunt SNT-100-BK-G Samtec 969102-0000- DA 3M
TP1, TP2, TP3, TP4,
TP5, TP6, TP7, TP8,
TP9, TP10 10 Test Point, Compact, SMT Testpoint_Keystone_Compact 5016 Keystone
U1 1 Dual, 500-mA, high-accuracy, adjustable-LDO in a small size
package, DSQ0010A (WSON-10) DSQ0010A TLV751DSQ Texas Instruments Texas Instruments
C1, C2, C5, C6, C7,
C8, C11, C12 0 1 µF CAP, CERM, 1 µF, 50 V, ±10%, X7R, 0805 0805 08055C105KAT2A AVX
FID1, FID2, FID3 0 Fiducial mark. There is nothing to buy or mount. N/A N/A N/A
J1, J4, J9, J13 0 SMA Straight Jack, Gold, 50 Ω, TH SMA Straight Jack, TH 901-144-8RFX Amphenol RF
J17 0 Header, 2.54 mm, 5x2, Gold, TH Header, 2.54 mm, 5x2, TH 61301021121 Wurth Elektronik