User's GuideSLVU266 – August 2008
TPS720xxEVM-307
This user’s guide describes the characteristics, operation, and use of the TPS720xxEVM-307 evaluationmodule (EVM). This EVM demonstrates the Texas Instruments TPS720xx tiny low dropout (LDO) linearregulator in a 5-pin WCSP package. The TPS720xx supplies up to 350 mA of output current at a fixedoutput voltage from a 1.1 V to 4.5 V input source. This user’s guide includes setup instructions, testresults, schematic diagram, bill of materials (BOM), and PCB layout drawings for the EVM.
Contents1 Introduction ................................................................................................................... 22 EVM Jumpers and Connectors ............................................................................................ 33 Operation ..................................................................................................................... 34 Test Results .................................................................................................................. 45 Board Layout, Schematic and Bill of Materials .......................................................................... 5
List of Figures
1 Startup From Enable of the TPS72015EVM-307 into 350 mA Load (V
IN
= 2V, V
BIAS
= 2.9V) ..................... 42 Load Transient of the TPS72015EVM-307, V
IN
= 2V, V
BIAS
= 2.9V, I
OUT
= 0mA to 300mA to 0mA .............. 43 Top Assembly Layer ......................................................................................................... 54 Top Layer ..................................................................................................................... 65 Bottom Layer ................................................................................................................. 66 TPS720xxEVM-307 Schematic ............................................................................................ 7
List of Tables
1 Typical Performance Specification Summary ............................................................................ 22 TPS720xxEVM-307 Jumpers and Connectors........................................................................... 33 Bill of Materials ............................................................................................................... 8
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1 Introduction
1.1 Related Documentation From Texas Instruments
1.2 Performance Specification Summary
1.3 Modifications
Introduction
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The TPS720xxEVM-307 evaluation module (EVM) assists designers in evaluating the operation andperformance of the TPS720xx low dropout (LDO) linear regulator. This LDO provides up to 350 mA ofoutput current at a fixed output programmed at the factory. The board features the 1,33-mm ×0,96-mm5-pin WCSP package for a tiny solution size.
TPS720xx, 350 mA Low Dropout Linear Regulator with Bias Pin in a 5-Pin WCSP Package data sheet(SBVS100 )
Table 1 provides a summary of the TPS720xxEVM-307 performance specifications. All specifications aregiven for an ambient temperature of 25 °C.
Table 1. Typical Performance Specification Summary
VOLTAGE RANGE CURRENT RANGE(V) (mA)CONDITION
MIN TYP MAX MIN TYP MAX
TPS72013EVM-307
2.7
(1)
5.5 5(HPA307-001)V
BIAS
supply
TPS72015EVM-307
2.9
(1)
5.5 5(HPA307-002)
TPS72013EVM-307 4.5V or1.5
(1)
350(HPA307-001) V
BIAS
(2) (3)V
IN
supply
TPS72015EVM-307 4.5V or1.7
(1)
350(HPA307-002) V
BIAS
(2) (3)
TPS72013EVM-307
V
OUT
1.274 1.3 1.326 350
(2)(HPA307-001)
TPS72015EVM-307
V
OUT
1.47 1.5 1.53 350
(2)(HPA307-002)
(1)
This is the minimum voltage to provide the maximum output current in the table assuming the typical V
BIAS
voltage is applied.Lower output currents are achievable with lower V
IN
and V
BIAS
voltages. See the data sheet for V
IN
to V
OUT
and V
BIAS
to V
OUTdropout data.(2)
Linear regulator power dissipation is computed as P
D
= (V
IN
– V
OUT
)×I
OUT
. As specified in the data sheet, the regulator'spackage has a finite power dissipation rating depending on the ambient temperature, board type, and airflow. Using V
IN
and/orV
OUT
voltages other than the typical voltages recommended in the table or using the EVM in an environment with an ambienttemperature higher than 25 °C significantly reduces the maximum allowed output current. See the data sheet for the regulatorpackage's thermal resistance data, and see TI application report Digital Designer's Guide to Linear Voltage Regulators andThermal Management (SLVA118 ) for a full explanation.(3)
The maximum allowable voltage on V
IN
is the lesser of 4.5V or the voltage on V
BIAS
, as specified in the datasheet.
To aid user customization of the EVM, the board was designed with devices having 0603 or largerfootprints. A real implementation likely occupies less total board space.
Changing components can improve or degrade EVM performance. For example, adding a larger outputcapacitor reduces output voltage undershoot but lengthens response time after a load transient event.Adding a larger input capacitor reduces droop at the V
IN
pin that inductive leads from the V
IN
power supplymay cause during a load transient.
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2 EVM Jumpers and Connectors
3 Operation
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EVM Jumpers and Connectors
This section describes the jumpers and connectors on the EVM as well as how to properly connect, setup, and use the TPS720xxEVM-307.
Table 2. TPS720xxEVM-307 Jumpers and Connectors
JUMPER DESCRIPTION DIRECTIONS
Connect the lead from the power terminal of the bias input source to this input. TheInput Bias VoltageJ1 - pin 1 supply must be between 2.5 V and 5.5 V. The supply must also be at least 1.4 V aboveConnection
the output voltage.Input Bias GroundJ1 - pin 2 Connect the lead from the return terminal of the bias source to this input.Connection
Connect the lead from the power terminal of the input source to this input. The supplyJ2 Input V
IN
Connection must be between 1.1 V and 4.5 V. The supply must be greater than 200 mV plus theoutput voltage.J3 Input Ground Connection Connect the lead from the return terminal of the input source to this input.J4 Output V
OUT
Connection Connect the positive side of the load and/or output multimeter to this output.Connect the lead from the return terminal of the load and/or output multimeter to thisJ5 Output Ground Connection
output.
This jumper allows the user to use one supply to power the TPS720xxEVM-307. Placea shunt across the pins of JP1 to connect the V
IN
and V
BIAS
inputs. The J1 or the J2JP1 V
IN
and V
BIAS
Connection connector may be used to supply the circuit with the shunt installed. In this mode, thesupply must meet the requirements for both the V
IN
and V
BIAS
supplies. Remove theshunt to use separate supplies for each input.Enable input for the TPS720xxEVM-307. Place a shunt across the ON and EN pins ofJP2 to enable the TPS720xxEVM-307. Place a shunt across the OFF and EN pins ofJP2 EN
JP2 to disable the TPS720xxEVM-307. A shunt must be installed on JP2 in either ONor OFF positions and EN should not be left unconnected.
Connect the positive input of the bias supply to the V
BIAS
pin on J1 (pin 1). Connect the positive inputpower supply to the V
IN
pins on J2. Connect the input bias supply return (ground) to pin 2 of J1. Connectthe input power return (ground) for V
IN
to the GND pin on J3. The TPS720xxEVM-307 has a maximuminput voltage of 5V for V
IN
and 6V for V
BIAS
. The recommended maximum operating input voltage is 4.5 Vfor V
IN
and 5.5V for V
BIAS
.
Connect the desired load between V
OUT
(J4) and GND (J5). The TPS720xx supplies up to 350 mA ofoutput current.
Configure jumpers JP1 and JP2 as described in the TPS720xxEVM-307 Jumpers and Connectors table.
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4 Test Results
OutputVoltage
Enable
OutputVoltage
LoadCurrent
Test Results
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This section provides typical performance waveforms using the TPS720xxEVM-307 printed circuit board.
Figure 1. Startup From Enable of the TPS72015EVM-307 into 350 mA Load (V
IN
= 2V, V
BIAS
= 2.9V)
Figure 2. Load Transient of the TPS72015EVM-307, V
IN
= 2V, V
BIAS
= 2.9V, I
OUT
= 0mA to 300mA to 0mA
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5 Board Layout, Schematic and Bill of Materials
5.1 Board Layout
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Board Layout, Schematic and Bill of Materials
This section provides the TPS720xxEVM-307 board layout, schematic and bill of materials.
Board layout is important for all LDO power supplies. If the layout is not carefully done, the regulator couldshow stability problems. Therefore, use wide and short traces for the main current path and for the powerground tracks. The input and output capacitor should be placed as close as possible to the IC. Figure 3through Figure 5 show the board layout for the TPS720xxEVM-307 PCB.
Figure 3. Top Assembly Layer
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Board Layout, Schematic and Bill of Materials
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Table 3. Bill of Materials
COUNT
RefDes Value Description SIZE Part Number MFR-001 -002
0 0 C1 Open Capacitor, Ceramic, 10V, X5R, 20% 0805 Std Std1 1 C2 1.0uF Capacitor, Ceramic, 10V, X5R, 20% 0603 Std Std1 1 C3 0.1uF Capacitor, Ceramic, 6.3V, X5R, 0603 Std Std20%1 1 C4 2.2uF Capacitor, Ceramic, 6.3V, X5R, 0603 Std Std10%0 0 C5 Open Capacitor, Ceramic, 6.3V, X5R, 0805 Std Std10%1 1 R1 0 Resistor, Chip, 5% 0603 Std Std5 5 J1- J5 PTC36SAAN Header, Male 2-pin, 100mil spacing, 0.100 inch x 2 PTC36SAAN Sullins(36-pin strip)1 1 JP1 PTC36SAAN Header, 2-pin, 100mil spacing, 0.100 inch x 2 PTC36SAAN Sullins(36-pin strip)1 1 JP2 PTC36SAAN Header, 3-pin, 100mil spacing, 0.100 inch x 3 PTC36SAAN Sullins(36-pin strip)2 2 TP1, TP2 5000 Test Point, Red, Thru Hole Color 0.100 x 0.100 5000 KeystoneKeyed inch1 0 U1 TPS72013YZU IC, LDO Linear Regulator With Bias WCSP-5 TPS72013YZU TIPin, 350mA0 1 TPS72015YZU IC, LDO Linear Regulator With Bias WCSP-5 TPS72015YZU TIPin, 350mA2 2 – Shunt, 100mil, Black 0.1 929950-00 3M1 1 – HPA307 Rev. A PCB 0.062"x1.025"x1 HPA307 Any.45"
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EVALUATION BOARD/KIT IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must haveelectronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be completein terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmentalmeasures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit doesnot fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling(WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days fromthe date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYERAND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OFMERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claimsarising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and allappropriate precautions with regard to electrostatic discharge.EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANYINDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.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 orservices described herein.
Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. Thisnotice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/orsafety programs, please contact the TI application engineer or visit www.ti.com/esh .No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, orcombination in which such TI products or services might be or are used.FCC Warning
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radiofrequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which aredesigned to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments maycause interference with radio communications, in which case the user at his own expense will be required to take whatever measures maybe required to correct this interference.
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EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 1.1 V to 4.5 V on Vin and 2.5 V to 5.5V on Vbias and the output voltagerange of 0.9 V to 3.6 V.Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questionsconcerning 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 operateproperly with certain components above 85 °C as long as the input and output ranges are maintained. These components include but arenot limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identifiedusing 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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