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. 1 2 3 4 5 6 Contents Introduction .................................................................................................................. Setup ......................................................................................................................... 2.1 Input / Output Connector Descriptions .......................................................................... Operation ..................................................................................................................... 3.1 Operation ............................................................................................................ Thermal Guidelines ......................................................................................................... 4.1 Thermal Considerations ........................................................................................... Board Layout ................................................................................................................ 5.1 Layout ............................................................................................................... Schematic and Bill of Materials ........................................................................................... 6.1 Schematic ........................................................................................................... 6.2 Bill of Materials ..................................................................................................... 1 2 2 2 2 2 2 4 4 6 6 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 1 HPA407A Bill of Materials ................................................................................................. 6 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. SLVU323 - February 2010 Submit Documentation Feedback TPS727xxYFF EVM Copyright (c) 2010, Texas Instruments Incorporated 1 Setup 2 www.ti.com 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 2.1.1 Input / Output Connector Descriptions 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 47F 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 x qJA (1) where TJ is the junction temperature, TA is the ambient temperature, Pd is the power dissipation in the IC and qJA is the thermal resistance from junction to ambient. All temperatures are in degrees Celsius. 2 TPS727xxYFF EVM SLVU323 - February 2010 Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Thermal Guidelines www.ti.com The measured thermal resistance from junction to ambient for the TPS727xxEVM has a typically value of 224C/W. The recommended maximum operating junction temperature specified in the datasheet for the TPS727xx family is 125C. 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 = 125C, TA = 85C, qJA = 224C/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. 125C = 85C + Pd (224C/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) x Iout = (Vin - 1.5V) x 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 (25C) or 85C to provide full output current while maintaining the junction temperature at or below 125C. The answer will depend on the output voltage. Maximum Input Voltage vs VOUT and Temperature VOUT 25C 85C 1.5 3.73 2.39 1.8 4.03 2.69 2.8 5.03 3.69 SLVU323 - February 2010 Submit Documentation Feedback TPS727xxYFF EVM Copyright (c) 2010, Texas Instruments Incorporated 3 Board Layout 5 www.ti.com Board Layout This chapter provides the TPS727xxYFFEVM-407 board layout and illustrations. 5.1 Layout Figure 1. Top Layer Assembly Figure 2. Top Layer Routing 4 TPS727xxYFF EVM SLVU323 - February 2010 Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Board Layout www.ti.com Figure 3. Bottom Layer Routing Figure 4. Bottom Layer Assembly SLVU323 - February 2010 Submit Documentation Feedback TPS727xxYFF EVM Copyright (c) 2010, Texas Instruments Incorporated 5 Schematic and Bill of Materials 6 www.ti.com 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 F Capacitor, Ceramic, 6.3V, X5R, 20%. 0603 STD Any 4 4 4 J1-J4 PEC02SAAN Header, 2-pin, 100mil spacing 0.100 inch x 2 PEC02SAAN Sullins 1 1 1 JP1 PEC03SAAN Header, 3-pin, 100mil spacing 0.100 inch x 3 PEC03SAAN Sullins 1 0 0 U1 TPS72715YFF IC, 200mA Ultra-low IQ LDO with Auto-Low Power Mode DSBGA TPS72715YFF TI 0 1 0 U1 TPS72718YFF IC, 200mA Ultra-low IQ LDO with Auto-Low Power Mode DSBGA TPS72718YFF TI 0 0 1 U1 TPS72728YFF IC, 200mA Ultra-low IQ LDO with Auto-Low Power Mode DSBGA TPS72728YFF TI 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, 0.903" x 1.050" x 0.062" HPA407** Any 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. 6 TPS727xxYFF EVM SLVU323 - February 2010 Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated 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 PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does not 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 from the date of delivery for a full refund. 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TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services 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. This notice contains important safety information about temperatures and voltages. For additional information on TI's environmental and/or safety 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, or combination 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 PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference. 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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