TPS61291EVM-569

User's Guide SLVUA29 – September 2014 TPS61291EVM-569 Evaluation Module The TPS61291EVM-569 (PWR569-001) facilitates the evaluation of the TPS61291 Low IQ Boost Converter with Bypass Mode device. The device outputs a user-selectable output voltage of 2.5 V, 3 V, or 3.3 V. Available output current depends on the input voltage and output voltage but is generally around 200 mA for most applications. 1 2 3 4 5 Contents Introduction ................................................................................................................... Setup .......................................................................................................................... TPS61291EVM-569 Test Results ......................................................................................... Board Layout ................................................................................................................. Schematic and Bill of Materials ............................................................................................ 1 3 4 5 7 List of Figures 1 Thermal Performance (VIN = 1.8 V, VOUT = 3.3 V, IOUT = 200 mA)...................................................... 4 2 Top Silkscreen Layer ........................................................................................................ 5 3 Top Copper Layer 4 5 ........................................................................................................... Bottom Copper Layer........................................................................................................ TPS61291EVM-569 Schematic ............................................................................................ 6 6 7 List of Tables 1 ..................................................................................... 1 Performance Specification Summary 2 TPS61291EVM-569 Bill of Materials ...................................................................................... 7 2 Introduction The TPS61291 is a synchronous, step-up converter in a 2 x 2-mm, 6-pin SON package. The output voltage is fixed inside the device to 2.5 V, 3 V, or 3.3 V by the connection of the VSEL pin at startup. SLVUA29 – September 2014 Submit Documentation Feedback TPS61291EVM-569 Evaluation Module Copyright © 2014, Texas Instruments Incorporated 1 Introduction 1.1 www.ti.com Performance Specification Table 1 provides a summary of the TPS61291EVM-569 performance specifications. All specifications are given for an ambient temperature of 25°C. Table 1. Performance Specification Summary Specification Test Conditions Min Typ Max 0.9 1.8 5 After startup Output Voltage Setpoint VSEL = Low before startup 3.3 V VSEL = Floating before startup 2.5 V VSEL = High (VOUT) before startup Output Current 1.2 Unit Input Voltage VIN = 1.8 V, VOUT = 3.3 V 3 0 200 V V mA Bypass Mode Operation When the EN pin is pulled low, the IC enters a low current consumption bypass mode of operation. In this mode, the output voltage follows the input voltage minus any drops in the internal switch. The output voltage is not regulated in this mode and can go higher or lower than the setpoint. 1.3 Modifications The printed-circuit board (PCB) for this EVM is designed to accommodate some modifications by the user. Additional input and output capacitors can be added and the output voltage can be changed. 1.3.1 Input and Output Capacitors C6 is provided for an additional input capacitor. This capacitor is not required for proper operation but can be used to reduce the input voltage ripple. C3 and C4 are provided for additional output capacitors. These capacitors are not required for proper operation but can be used to reduce the output voltage ripple and to improve the load transient response. The total output capacitance must remain within the recommended range in the data sheet for proper operation. 1.3.2 Changing the Output Voltage The output voltage is fixed inside the TPS61291 to one of these 3 values: 2.5 V, 3 V, or 3.3 V. A specific value is selected through the VSEL pin setting, per Table 1. Once the device is enabled, the VSEL pin setting is latched and further changes to the VSEL pin have no effect on the output voltage. To adjust the output voltage, it is necessary to change the VSEL setting while the device is disabled. 1.3.3 EN Pin Pull-up Resistor Any pull-up or pull-down resistor can draw significant current and affect the measured efficiency. This is especially true in bypass mode, where the TPS61291 consumes typically 15 nA. For example, if the EN pin were pulled up to the input voltage with a 1-MΩ resistor and the pin were tied low through JP1, this would draw an extra 1.8 µA from the input source at a 1.8-V input voltage. This would greatly affect the measured efficiency in bypass mode. For this reason, no pull-up or pull-down resistors have been used on the TPS61291EVM-569. The final application circuit should ensure that the EN pin input to the TPS61291 is terminated either high or low and not left floating, per the device data sheet. 2 TPS61291EVM-569 Evaluation Module SLVUA29 – September 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Setup www.ti.com 2 Setup This section describes how to properly use the TPS61291EVM-569. 2.1 Input/Output Connector Descriptions J1 – VIN J2 – S+/S– J3 – GND J4 – VOUT J5 – S+/S– J6 – GND JP1 – EN JP2 – VSEL 2.2 Positive input connection from the input supply for the EVM Input voltage sense connections. Measure the input voltage at this point Return connection from the input supply for the EVM Output voltage connection Output voltage sense connections. Measure the output voltage at this point. Output return connection EN pin input jumper. Place the supplied jumper across ON and EN/BYP to turn on the IC. Place the jumper across BYP and EN/BYP to turn off the IC and enable bypass mode. The input voltage appears at the output in bypass mode. VSEL pin input jumper. Place the supplied jumper across HIGH and VSEL to select the 3-V output voltage. Place the jumper across LOW and VSEL to select the 3.3-V output voltage. Remove the jumper and leave JP2 floating to select the 2.5-V output voltage. This jumper must be set before the device is enabled. To change the output voltage, it is required to disable the device and then re-enable it with the new VSEL setting. Setup To operate the EVM, set jumpers JP1 and JP2 to the desired positions per Section 2.1. Connect the input supply to J1 and J3 and connect the load to J4 and J6. SLVUA29 – September 2014 Submit Documentation Feedback TPS61291EVM-569 Evaluation Module Copyright © 2014, Texas Instruments Incorporated 3 TPS61291EVM-569 Test Results 3 www.ti.com TPS61291EVM-569 Test Results The TPS61291EVM-569 was used to take most of the data in the TPS61291 data sheet, SLVSBX9. The only difference is the inductor used. This EVM uses a smaller inductor than the data sheet. Figure 1. Thermal Performance (VIN = 1.8 V, VOUT = 3.3 V, IOUT = 200 mA) 4 TPS61291EVM-569 Evaluation Module SLVUA29 – September 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Board Layout www.ti.com 4 Board Layout This section provides the TPS61291EVM-569 board layout and illustrations in Figure 2 through Figure 4. The Gerbers are available on the EVM product page: TPS61291EVM-569. Rev. B of the PCB just edited the silkscreen. No copper changes were made from Rev. A. Figure 2. Top Silkscreen Layer SLVUA29 – September 2014 Submit Documentation Feedback TPS61291EVM-569 Evaluation Module Copyright © 2014, Texas Instruments Incorporated 5 Board Layout www.ti.com Figure 3. Top Copper Layer Figure 4. Bottom Copper Layer 6 TPS61291EVM-569 Evaluation Module SLVUA29 – September 2014 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Schematic and Bill of Materials www.ti.com 5 Schematic and Bill of Materials This section provides the TPS61291EVM-569 schematic and bill of materials (BOM). 5.1 Schematic Figure 5 illustrates the EVM schematic. TP1 L1 VOUT VLF302515MT-3R3M VIN U1 1 L J1 2 1 VIN 0.9V to 5.0V VOUT 3 C1 10µF J2 2 1 S+ S- C5 100µF 1 2 VSEL VOUT 2.5V/3V/3.3V J4 EN/BYP 5 C6 2 VIN 4 GND PAD C2 22µF 6 C3 C4 1 1 1 2 S+ S- TPS61291DRV J5 1 J3 1 2 2 1 GND GND J6 VIN JP1 3 2 1 ON EN/BYP BYP HIGH 3.0V Floating 2.5V LOW 3.3V 1 Not Installed VOUT JP2 HIGH VSEL LOW VSEL VOUT ---------------------------- 3 2 1 Figure 5. TPS61291EVM-569 Schematic 5.2 Bill of Materials Table 2 lists the BOM for this EVM. Table 2. TPS61291EVM-569 Bill of Materials Count RefDes Value Description Size Part Number MFR 1 C1 10uF Capacitor, Ceramic, X5R, 10V, 10% 0805 GRM219R61A106KE44D Murata 1 C2 22uF Capacitor, Ceramic, X5R, 6.3V, 20% 0805 GRM21BR60J226ME39L Murata 1 C5 100uF Capacitor, Ceramic, X5R, 6.3V, 20% 1210 GRM32ER60J107ME20L Murata 1 L1 3.3uH Inductor, SMT, 1.23A, 60-mΩ 3 mm x 2.5 mm VLF302515MT-3R3M TDK 1 U1 TPS61291 IC, Low IQ Boost Converter with Bypass Operation 2 mm x 2 mm TPS61291DRV TI The TPS61291EVM-569 may be populated with TPS61291 (U1) devices that do not contain the correct top side markings on the top of the device itself. These devices are still fully-tested TPS61291 devices. SLVUA29 – September 2014 Submit Documentation Feedback TPS61291EVM-569 Evaluation Module Copyright © 2014, Texas Instruments Incorporated 7 ADDITIONAL TERMS AND CONDITIONS, WARNINGS, RESTRICTIONS, AND DISCLAIMERS FOR EVALUATION MODULES Texas Instruments Incorporated (TI) markets, sells, and loans all evaluation boards, kits, and/or modules (EVMs) pursuant to, and user expressly acknowledges, represents, and agrees, and takes sole responsibility and risk with respect to, the following: 1. User agrees and acknowledges that EVMs are intended to be handled and used for feasibility evaluation only in laboratory and/or development environments. Notwithstanding the foregoing, in certain instances, TI makes certain EVMs available to users that do not handle and use EVMs solely for feasibility evaluation only in laboratory and/or development environments, but may use EVMs in a hobbyist environment. All EVMs made available to hobbyist users are FCC certified, as applicable. Hobbyist users acknowledge, agree, and shall comply with all applicable terms, conditions, warnings, and restrictions in this document and are subject to the disclaimer and indemnity provisions included in this document. 2. Unless otherwise indicated, EVMs are not finished products and not intended for consumer use. EVMs are intended solely for use by technically qualified electronics experts who are familiar with the dangers and application risks associated with handling electrical mechanical components, systems, and subsystems. 3. User agrees that EVMs shall not be used as, or incorporated into, all or any part of a finished product. 4. User agrees and acknowledges that certain EVMs may not be designed or manufactured by TI. 5. 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U.S. Federal Communications Commission Compliance For EVMs Annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant Caution This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Changes or modifications could void the user's authority to operate the equipment. FCC Interference Statement for Class A EVM devices This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at its own expense. FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: • Reorient or relocate the receiving antenna. • Increase the separation between the equipment and receiver. • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. • Consult the dealer or an experienced radio/TV technician for help. Industry Canada Compliance (English) For EVMs Annotated as IC – INDUSTRY CANADA Compliant: This Class A or B digital apparatus complies with Canadian ICES-003. Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. Concerning EVMs Including Radio Transmitters This device complies with Industry Canada licence-exempt RSS standard(s). 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Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device. Canada Industry Canada Compliance (French) Cet appareil numérique de la classe A ou B est conforme à la norme NMB-003 du Canada Les changements ou les modifications pas expressément approuvés par la partie responsable de la conformité ont pu vider l’autorité de l'utilisateur pour actionner l'équipement. Concernant les EVMs avec appareils radio Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement. 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