User's Guide
SLVU323–February 2010
TPS727xxYFF EVM
This User’s Guide describes the characteristics, operation, and use of the TPS727xxYFFEVM-407. This
EVM demonstrates the Texas Instruments TPS727xx, a Low Drop Out (LDO) linear regulator in a chip
scale (WCSP-4) package that is capable of 200mA of output current. This user’s guide includes setup
instructions, a schematic diagram, thermal guidelines, a bill of materials (BOM), and PCB layout drawings
for the evaluation module.
Contents
1 Introduction .................................................................................................................. 1
2 Setup ......................................................................................................................... 2
2.1 Input / Output Connector Descriptions .......................................................................... 2
3 Operation ..................................................................................................................... 2
3.1 Operation ............................................................................................................ 2
4 Thermal Guidelines ......................................................................................................... 2
4.1 Thermal Considerations ........................................................................................... 2
5 Board Layout ................................................................................................................ 4
5.1 Layout ............................................................................................................... 4
6 Schematic and Bill of Materials ........................................................................................... 6
6.1 Schematic ........................................................................................................... 6
6.2 Bill of Materials ..................................................................................................... 6
List of Figures
1 Top Layer Assembly........................................................................................................ 4
2 Top Layer Routing .......................................................................................................... 4
3 Bottom Layer Routing ...................................................................................................... 5
4 Bottom Layer Assembly.................................................................................................... 5
5 TPS727xxYFFEVM-407 Schematic ..................................................................................... 6
List of Tables
1 HPA407A Bill of Materials ................................................................................................. 6
1 Introduction
The TPS727xxYFFEVM-407 evaluation module (EVM) helps designers evaluate the operation and
performance of the TPS727xx LDO in the WCSP-4 package. The TPS727xx is a 200mA, ultra-low Iq, fast
transient response, linear regulator.
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Setup
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2 Setup
This chapter describes the jumpers and connectors on the EVM as well as how to properly connect, setup,
and use the TPS727xxEVM.
2.1 Input / Output Connector Descriptions
2.1.1 J1 – VIN
This is the positive input supply voltage. The leads to the input supply should be twisted and kept as short
as possible to minimize EMI transmission. Additional bulk capacitance should be added between J1 and
J2 if the supply leads are greater than six inches. An additional 47µF or greater capacitor improves the
transient response of the TPS727xx and helps to reduce ringing on the input when long supply wires are
used.
2.1.2 J3 – VOUT
This is the positive connection from the output. Connect this pin to the positive input of the load.
2.1.3 J2 – GND
This is the return connection for the input power supply of the regulator.
2.1.4 J4 – GND
This is the return connection for the output.
2.1.5 JP1 – ENABLE
This jumper is used to enable or disable the output of the TPS727xx. Placing a shorting jumper between
pins 1 and 2 ('ON' position) will enable the TPS727xx. Placing the shorting jumper between pins 2 and 3
('OFF' position) will disable the TPS727xx.
3 Operation
This chapter provides information about the operation of the TPS727xxEVM.
3.1 Operation
Connect the positive input power supply to J1. Connect the input power return (ground) to J2. The
TPS727xxEVM has an absolute maximum input voltage of 6.0V. The recommended maximum operating
voltage is 5.5V. The actual highest input voltage may be less than 5.5V due to thermal conditions. See the
Thermal Considerations section of this manual to determine if the highest input voltage.
Connect the desired load between J3 (positive lead) and J4 (negative or return lead). Configure jumper J6
for the desired output voltage.
4 Thermal Guidelines
This chapter provides guidelines for the thermal management of the TPS727xxYFFEVM-407 board.
4.1 Thermal Considerations
Thermal management is a key component of design of any power converter and is especially important
when the power dissipation in the LDO is high. To better help you design the TPS727xx family into your
application, the following formula should be used to approximate the maximum power dissipation at a
particular ambient temperature:
TJ= TA+ Pd×qJA (1)
where TJis the junction temperature, TAis the ambient temperature, Pdis the power dissipation in the IC
and qJA is the thermal resistance from junction to ambient. All temperatures are in degrees Celsius.
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Thermal Guidelines
The measured thermal resistance from junction to ambient for the TPS727xxEVM has a typically value of
224˚C/W. The recommended maximum operating junction temperature specified in the datasheet for the
TPS727xx family is 125°C. With these two pieces of information, the maximum power dissipation can be
found by using Equation 1.
Example Calculation:
For example, what is the maximum input voltage that can be applied to a TPS727xx with a 1.5V output
voltage if the ambient temperature is 85C and the full 200mA of load current is required?
Given: TJ= 125°C, TA= 85°C, qJA = 224°C/W (2)
Using Equation 1, we substitute in the given values above and find that the maximum power dissipation
for the part is Pd=0.178W.
125°C = 85°C + Pd(224°C/W) (3)
This means that the total power dissipation of the TPS727xx must be less than 0.178W. Now the input
voltage can be calculated.
Pd= (Vin–Vout) × Iout = (Vin – 1.5V) × 0.2A = 0.178W (4)
So the maximum input voltage would need to be 2.39V or less in order to maintain a safe junction
temperature.
Similar analysis can be performed to determine the maximum input voltage at room temperature (25°C) or
85°C to provide full output current while maintaining the junction temperature at or below 125°C. The
answer will depend on the output voltage.
Maximum Input Voltage vs VOUT and
Temperature
VOUT 25°C 85°C
1.5 3.73 2.39
1.8 4.03 2.69
2.8 5.03 3.69
3
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Schematic and Bill of Materials
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6 Schematic and Bill of Materials
This chapter provides the TPS727xxYFFEVM-407 schematic and bill of materials.
6.1 Schematic
Figure 5. TPS727xxYFFEVM-407 Schematic
6.2 Bill of Materials
Table 1. HPA407A Bill of Materials
-001 -002 -003 RefDes Value Description Size Part Number MFR
2 2 2 C1, C2 1.0 µF Capacitor, Ceramic, 6.3V, X5R, 20%. 0603 STD Any
4 4 4 J1–J4 PEC02SAAN Header, 2-pin, 100mil spacing 0.100 inch × 2 PEC02SAAN Sullins
1 1 1 JP1 PEC03SAAN Header, 3-pin, 100mil spacing 0.100 inch × 3 PEC03SAAN Sullins
1 0 0 U1 TPS72715YFF IC, 200mA Ultra-low IQ LDO with Auto-Low Power DSBGA TPS72715YFF TI
Mode
0 1 0 U1 TPS72718YFF IC, 200mA Ultra-low IQ LDO with Auto-Low Power DSBGA TPS72718YFF TI
Mode
0 0 1 U1 TPS72728YFF IC, 200mA Ultra-low IQ LDO with Auto-Low Power DSBGA TPS72728YFF TI
Mode
1 1 1 N/A Shunt, 100 mil, Black 0.100 929950-00 3M
1 1 1 N/A PCB, FR-4, 2-Layer, SMOBC, HPA407** Any
0.903" x 1.050" x 0.062"
Notes: 1 These assemblies are ESD sensitive, ESD precautions shall be observed.
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. Ref designators marked with an asterisk ('**') cannot be substituted.
All other components can be substituted with equivalent MFG's components.
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This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
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EVM Warnings and Restrictions
It is important to operate this EVM within the input voltage range of 2.0 V to 5.5 V and the output voltage range of 1.5 V to 2.8 V .
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are
questions concerning the input range, please contact a TI field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the
EVM. 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 85° C. The EVM is designed to
operate properly with certain components above 85° C as long as the input and output ranges are maintained. These components
include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of
devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near
these devices during operation, please be aware that these devices may be very warm to the touch.
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