Texas Instruments TPS7A94EVM-046 User manual

User’s Guide
TPS7A94EVM-046 Evaluation Module
ABSTRACT
Figure 1-1. TPS7A94EVM-046 Evaluation Module
This user's guide describes the operational use of the TPS7A94EVM-046 evaluation module (EVM) as a
reference design for engineering demonstration and evaluation of the TPS7A9401DSC, an ultra-low noise,
ultra-high PSRR, RF 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).
Throughout this document the terms demonstration kit, evaluation board, and evaluation module are
synonymous with the TPS7A94EVM-046.
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Table of 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.......................................................................................................................................................... 4
2.3 Equipment Connections..................................................................................................................................................... 5
3 Operation.................................................................................................................................................................................5
4 PCB Layout..............................................................................................................................................................................6
5 Schematic................................................................................................................................................................................8
6 Bill of Materials....................................................................................................................................................................... 9
7 Revision History................................................................................................................................................................... 10
List of Figures
Figure 1-1. TPS7A94EVM-046 Evaluation Module..................................................................................................................... 1
Figure 4-1. Assembly Layer.........................................................................................................................................................6
Figure 4-2. Top Layer Routing..................................................................................................................................................... 6
Figure 4-3. First Middle Layer......................................................................................................................................................6
Figure 4-4. Second Middle Layer.................................................................................................................................................6
Figure 4-5. Bottom Layer Routing................................................................................................................................................7
Figure 5-1. TPS7A94EVM-046 Schematic.................................................................................................................................. 8
List of Tables
Table 1-1. Related Documentation.............................................................................................................................................. 3
Table 6-1. TPS7A94EVM-046 BOM1234 ................................................................................................................................... 9
Trademarks
All trademarks are the property of their respective owners.
Table of Contents www.ti.com
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1 Introduction
Texas Instruments' TPS7A94EVM-046 helps design engineers evaluate the operation and performance of the
TPS7A94 linear regulator for possible use in their own circuit application. This particular EVM configuration
contains a single high-accuracy, small size, adjustable linear regulator for a wide range of applications. The
regulator is capable of delivering up to 1 A to the load with low VIN to VOUT dropout voltage. For stability, use a
minimum capacitor of 4.7 µF at the input and output.
Table 1-1 lists the related documentation available through the Texas Instrument web site at www.ti.com.
Table 1-1. Related Documentation
Device Literature Number
TPS7A94 SBVS336
1.1 Before You Begin
The following warnings and cautions are noted for the safety of anyone using or working close to the
TPS7A94EVM-046. 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 TPS7A94EVM-046, including the jumpers and
connectors on the EVM board.
2.1 Inputs/Outputs Connectors and Jumper Descriptions
2.1.1 J1 – IN
Input power-supply voltage connector with ground connection.
2.1.2 J2 – OUT
Regulated output voltage with ground connection.
2.1.3 J3
10-pin header connector with all input and output signals.
2.1.4 TP1 – IN
Input power-supply sense.
2.1.5 TP2 – PG
Power-good sense connection.
Note
If the EVM is implemented as described in Section 5 with R3 and R7 set to 10 kΩ, the PG pin is not
operational. See the TPS7A94 data sheet for to set the PG_FB resistor divider.
2.1.6 TP3 – SNS
Sense pin test-point connection.
2.1.7 TP4 – PG_FB
Feedback pin test-point connection.
Note
As implemented in Section 5, with R3 and R7 set to 10 kΩ, the programmable current limit is set to
100% of ILIMIT and the PG pin is not operational.
For a complete implementation of both the PG pin and the current limit, see the TPS7A94 data sheet.
2.1.8 TP5 – OUT
Regulated output test-point connection.
2.1.9 TP6 – EN
Enable voltage test-point connection.
2.1.10 TP7 – GND
Ground pin test-point connection.
2.1.11 TP8 – GND
Ground pin test-point connection.
2.2 Soldering Guidelines
To avoid damaging the device, use a hot-air system for any solder rework to modify the EVM for the purpose of
repair or other application reasons.
EVM Setup www.ti.com
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2.3 Equipment Connections
Connect the equipment in the following steps:
1. Set the input power supply to 6 V (maximum), and turn the power supply off
2. Connect a BNC connector jack from the input power supply to the J1 VIN connector on the EVM
3. Connect a 0-A to 1-A load between OUT and GND
3 Operation
Operate the equipment using the following steps:
1. Turn on the power supply
2. Vary the respective loads and input voltages, as necessary, for test purposes
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4 PCB Layout
Figure 4-1 to Figure 4-5 illustrate the PCB layout for this EVM.
Figure 4-1. Assembly Layer Figure 4-2. Top Layer Routing
Figure 4-3. First Middle Layer Figure 4-4. Second Middle Layer
PCB Layout www.ti.com
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Figure 4-5. Bottom Layer Routing
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5 Schematic
Figure 5-1 shows the schematic for this EVM.
Figure 5-1. TPS7A94EVM-046 Schematic
Schematic www.ti.com
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6 Bill of Materials
Table 6-1 shows the bill of materials (BOM) for this EVM.
Table 6-1. TPS7A94EVM-046 BOM1234
DESIGNATOR QTY VALUE DESCRIPTION PACKAGE REFERENCE PART NUMBER MANUFACTURER ALTERNATE
PART NUMBER
ALTERNATE
MANUFACTURER
!PCB1 1 Printed Circuit Board TPS7A9401DSC Any
C1, C6 2 10 µF CAP, CERM, 10 uF, 25 V, +/- 20%, X7R, 1210 1210 C3225X7R1E106M250AC TDK
C2, C3, C4, C5 4 10 µF CAP, CERM, 10 µF, 16 V,+/- 10%, X7R, 0805 0805 EMK212BB7106KG-T Taiyo Yuden
C7, C8 2 4.7µF Cap Ceramic 4.7uF 50V X7R 10% Pad SMD 0805 +125°C
Automotive T/R 0805 CGA4J1X7R1H475K125AC TDK Corporation
FID1, FID2, FID3 0 Fiducial mark. There is nothing to buy or mount. N/A N/A N/A
H1, H2, H3, H4 4 Machine Screw, Round, #4-40 x 1/4, Nylon, Philips panhead Screw NY PMS 440 0025 PH B&F Fastener Supply
H5, H6, H7, H8 4 Standoff, Hex, 0.5"L #4-40 Nylon Standoff 1902C Keystone
H9, H10, H11, H12 4 Bumpon, Hemisphere, 0.44 X 0.20, Clear Transparent Bumpon SJ-5303 (CLEAR) 3M
H13, H14, H15, H16,
H17, H18, H19, H20 8 RFI SHIELD CLIP TIN SMD RFI SHIELD CLIP TIN SMD S2711-46R Harwin
J1, J2 2 BNC Connector Jack, Female Socket 50Ohm Through Hole
Solder PTH_BNC_JACK_VERT 4578 Pomona Electronics
J3 1 Header, 2.54mm, 5x2, Gold, Black, SMT Header, 2.54mm, 5x2, SMT GBC05DABN-M30 Sullins Connector
Solutions
MP1 1 SMT_RF-SHIELD S01-50250500 Harwin
R1 1 0 RES, 0, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 RMCF0603ZT0R00 Stackpole Electronics
Inc
R2, R3, R4, R5, R7 5 10.0k RES, 10.0k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 0603 RMCF0603FT10K0 Stackpole Electronics
Inc
R6 1 22k RES, 22k Ohms, 1% 0.1W, 1/10W Chip Resistor 0603 Thick Film 0603 CRCW060322K0FKEAC Vishay
TP1, TP2, TP3, TP4,
TP5, TP6, TP7, TP8 8 Test Point, Compact, SMT Testpoint_Keystone_Compact 5016 Keystone
U1 1 1-A, Ultra-Low Noise, Ultra-High PSRR, RF Voltage Regulator WSON10 TPS7A9401DSC Texas Instruments
1. This assembly is ESD sensitive; observe ESD precautions.
2. This assembly must be clean and free from flux and all contaminants. Use of no-clean flux is not acceptable.
3. This assembly 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.
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7 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision * (September 2021) to Revision A (April 2022) Page
• Added note to TP2 – PG section........................................................................................................................ 4
• Added note to TP4 – PG_FB section..................................................................................................................4
Revision History www.ti.com
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