Application Report SLVA332A – October 2009 – Revised June 2010 3.6-V to 6-V Input, 3.3-V Output, Tiny, and High-Efficiency DC/DC Converter ................................................................................................... PMP - DC/DC Low-Power Converters ABSTRACT This reference design is presented to help application designers and others who are trying to use the MSP430 in a system with an input voltage in the range of 3.6 V to 6 V with the primary design objective to minimize solution size as well as to maintain high efficiency and long battery life. 1 2 3 4 5 Contents Features ...................................................................................................................... Introduction .................................................................................................................. Requirements ................................................................................................................ List of Materials ............................................................................................................. Test Results ................................................................................................................. 5.1 Test Results ........................................................................................................ 2 2 3 5 6 6 List of Figures 8 ....................................................................................................................... Startup ....................................................................................................................... Startup ....................................................................................................................... Startup ....................................................................................................................... Output Ripple Voltage ..................................................................................................... Load Transient .............................................................................................................. Switching Node Waveform ................................................................................................ Switching Node Waveform ................................................................................................ 1 CC43 Family Power Requirements ....................................................................................... 3 2 MSP430x1xx Family Power Requirements 3 3 MSP430x2xx Family Power Requirements 3 1 2 3 4 5 6 7 Startup 6 6 6 6 6 6 7 7 List of Tables 4 5 6 ............................................................................. ............................................................................. MSP430x4xx Family Power Requirements ............................................................................. MSP430x5xx Family Power Requirements ............................................................................. PMP4775 List of Materials ................................................................................................. 4 5 5 NanoStar is a trademark of Texas Instruments. All other trademarks are the property of their respective owners. SLVA332A – October 2009 – Revised June 2010 3.6-V to 6-V Input, 3.3-V Output, Tiny, and High-Efficiency DC/DC Converter Copyright © 2009–2010, Texas Instruments Incorporated 1 Features 1 Features • • • • • • 2 www.ti.com 3.6-V to 6-V input voltage range Capable of driving up to 500 mA (TPS62300) High efficiency (over 92%) 3-MHz operation allows for small passive components Low quiescent current (20 mA) Tiny 8-pin NanoStar™ (chip scale) and QFN-10 packages Introduction This reference design is for the MSP430 family of microcontroller devices and accounts for the voltage and current requirements as described herein. The MSP430 devices require only a single 3.3-V input; no sequencing is required. The operating input voltage for this reference design is between 3.6 V to 6 V. This design is optimized for a small solution size with a low component count and high efficiency. For more information and other reference designs, please visit www.ti.com/processorpower. 2 3.6-V to 6-V Input, 3.3-V Output, Tiny, and High-Efficiency DC/DC Converter SLVA332A – October 2009 – Revised June 2010 Copyright © 2009–2010, Texas Instruments Incorporated Requirements www.ti.com 3 Requirements The power requirements for each MSP430 family are listed below. The power given is based on the amount of current the core consumes per megahertz (MHz). The Analog IMAX column indicates the amount of current added if the additional functional blocks are used. For more information and other reference designs, please visit www.ti.com/processorpower. Table 1. CC43 Family Power Requirements (1) (2) DEVICE FAMILY PIN NAME F613x, F513x AVCC, DVCC (1) VOLTAGE (V) MIN MAX CPU IMAX (mA/MHz) ANALOG IMAX (mA) SEQUENCIN G ORDER TIMING DELAY COMMENTS 1.8 3.6 250 (2) IREF = 140 n/a n/a +Maximum CPU speed of 20 MHz It is recommended to power AVCC and DVCC from the same source. A maximum difference of 0.3 V between AVCC and DVCC can be tolerated during power-up. Maximum value for CPU clocked at 20 MHz at 3 V shown. Actual value depends on supply voltage and MCLK/internal regulator settings. Does not include peripheral module supply current or GPIO source/sink currents, which must be added separately. Table 2. MSP430x1xx Family Power Requirements (1) DEVICE FAMILY VOLTAGE (V) PIN NAME MIN MAX CPU IMAX (mA/MHz) (2) ANALOG IMAX (mA) x11x1A VCC 1.8 3.6 350 Comp_A = 60 F12x VCC 1.8 3.6 350 Comp_A+ = 60 F11x2, 12x2 VCC 1.8 3.6 350 ADC10 = 1200, IREF = 400 COMMENTS C11x1: 300 mA/MHz max F13x, 14x[1] AVCC, DVCC (3) 1.8 3.6 560 Comp_A = 60, ADC12 = 1600, IREF = 800 F13x, 14x: Comp_A, ADC12 F14x1: Comp_A F15x, 16x, 161x AVCC, DVCC (3) 1.8 3.6 600 Comp_A = 60, ADC12 = 1600, IREF = 800, DAC12 = 1500 DAC outputs not loaded; DAC12 currents for a single DAC, max of two DAC12s in device) (1) (2) (3) Additional 7-mA maximum required when writing/erasing Flash In-system. 8-MHz maximum CPU clock speed (ex. Imax_x11x1 = 8 MHz × 350 mA = 2.8 mA). VCC = DVCC = AVCC = 3 V. Actual value depends on supply voltage. Does not include peripheral module supply current or GPIO source/sink currents, which must be added separately. It is recommended to power AVCC and DVCC from the same source. A maximum difference of 0.3 V between AVCC and DVCC can be tolerated. Table 3. MSP430x2xx Family Power Requirements (1) DEVICE FAMILY PIN NAME VOLTAGE (V) MIN MAX CPU IMAX (2) (mA/MHz) ANALOG IMAX (mA) F20xx VCC 1.8 3.6 370 Comp_A+ = 60 ADC10 = 1200, ADC10_IREF = 400 SD16_A + IREF = 1700 RefBuffer = 600 F21x1 VCC 1.8 3.6 410 Comp_A+ = 60 F21x2 AVCC, DVCC 1.8 3.6 350 Comp_A+ = 60 ADC10 = 1200, IREF = 400 F22xx AVCC, DVCC (3) 1.8 3.6 550 ADC12 = 1200, IREF = 400 OA = 290 F23x0 AVCC, DVCC (3) 1.8 3.6 550 Comp_A + = 60 (1) (2) (3) COMMENTS 20x1: Comp_A+ 20x2: ADC10 20x3: SD16_A 22x2: ADC10 22x4: ADC10, 2 OAs OA currents for a single amplifier Additional 7-mA maximum required when writing/erasing Flash In-system. 16 MHz maximum CPU clock speed (ex. Imax_20xx = 16 MHz × 370 mA = 5.90 mA). VCC = DVCC = AVCC = 3 V. Actual value depends on supply voltage. Does not include peripheral module supply current or GPIO source/sink currents, which must be added separately. It is recommended to power AVCC and DVCC from the same source. A maximum difference of 0.3 V between AVCC and DVCC can be tolerated during power-up. SLVA332A – October 2009 – Revised June 2010 3.6-V to 6-V Input, 3.3-V Output, Tiny, and High-Efficiency DC/DC Converter Copyright © 2009–2010, Texas Instruments Incorporated 3 Requirements www.ti.com Table 3. MSP430x2xx Family Power Requirements (1) (continued) DEVICE FAMILY F23x, 24x[1], 2410 F241x, 261x VOLTAGE (V) PIN NAME AVCC, DVCC AVCC, DVCC (3) (3) MIN MAX CPU IMAX (2) (mA/MHz) 1.8 3.6 445 Comp_A + = 60, ADC12 = 1000, IREF = 700 224x1: Comp_A+ 23x, 24x, 2410: Comp_A+, ADC12 560 Comp_A + = 60, ADC12 = 1000, IREF = 700 DAC12 = 1500 241x: Comp_A+, ADC12 261x: Comp_A+, ADC12, two DAC12s DAC12 outputs not loaded; DAC12 currents for a single DAC 1.8 3.6 ANALOG IMAX (mA) COMMENTS Table 4. MSP430x4xx Family Power Requirements (1) DEVICE FAMILY x41x (2) AVCC, DVCC VOLTAGE (V) MIN MAX CPU IMAX (mA/MHz) (3) ANALOG IMAX (mA) 1.8 3.6 350 Comp_A = 60 COMMENTS C41x: 300 mA/MHz max FW42x AVCC, DVCC 1.8 3.6 350 Comp_A = 60 Scan IF = 650 F42x AVCC, DVCC 1.8 3.6 500 SD16 + IREF = 1550 Ref Buffer = 600 SD16 current is for a single A/D (three on device) FE42x[a], 42x2 AVCC, DVCC 1.8 3.6 500 ESP430CE1 = 4900 Ref Buffer = 600 ESP430 current for 4-MHz operation F43x[1], F44x AVCC, DVCC 1.8 3.6 560 Comp_A = 60, ADC12 = 1600, IREF = 800 F42x0 AVCC, DVCC 1.8 3.6 520 SD16_A + IREF=1800 Ref Buffer = 600 DAC12=1500 DAC12 output not loaded 560 SD16_A + IREF=1800 Ref Buffer = 600 DAC12 = 1500, OA = 290 DAC12 output not loaded; OA current for a single amplifier (two OAs in device) 570 Comp_A = 60, ADC12 = 1600, IREF = 800, DAC12 = 1500, OA = 490 DAC12 outputs not loaded; OA and DAC12 currents for a single amplifier/DAC (three OAs, two DACs in device) DAC12 outputs no loaded; OA and DAC12 currents for a single amplifier/DAC (three OAs, two DACs in device) 16 MHz max CUP frequency; SD16 current is for a single A/D (four on device) FG42x0 FG43x AVCC, DVCC AVCC, DVCC 1.8 1.8 3.6 3.6 FG46xx AVCC, DVCC 1.8 3.6 740 Comp_A = 60, ADC12 = 1600, VREF = 800, DAC12 = 1500, OA = 490 F47xx AVCC, DVCC 1.8 3.6 560 Comp_A = 60, SD16_A + IREF = 1700 Ref Buffer = 600 (1) (2) (3) 4 PIN NAME Additional 7-mA maximum required when writing/erasing Flash In-system. It is recommended to power AVCC and DVCC from the same source. A maximum difference of 0.3 V between AVCC and DVCC can be tolerated. 8 MHz maximum CPU clock speed (ex. Imax_x41x = 8 MHz × 350 mA = 2.8 mA). (F47xx max CPU clock = 16 MHz) VCC = DVCC = AVCC = 3 V. Actual value depends on supply voltage. Does not include peripheral module supply current or GPIO source/sink currents, which must be added separately. LCD current not included. 3.6-V to 6-V Input, 3.3-V Output, Tiny, and High-Efficiency DC/DC Converter SLVA332A – October 2009 – Revised June 2010 Copyright © 2009–2010, Texas Instruments Incorporated List of Materials www.ti.com Table 5. MSP430x5xx Family Power Requirements DEVICE FAMILY F54xx (1) AVCC, DVCC (3) MIN MAX CPU IMAX (mA/MHz) (2) 2.2 3.6 348 ANALOG IMAX (mA) ADC12_A = 220, IREF = 190 COMMENTS 18 MHz maximum CPU clock speed Additional 5-mA maximum required when writing/erasing Flash In-system. 16 MHz maximum at 3-V CPU clock speed. Actual value depends on supply voltage and MCLK/internal regulator settings. Does not include peripheral module supply current or GPIO source/sink currents, which must be added separately. It is recommended to power AVCC and DVCC from the same source. A maximum difference of 0.3 V between AVCC and DVCC can be tolerated during power-up. (2) (3) 4 VOLTAGE (V) PIN NAME (1) List of Materials Table 6 shows the bill of materials (BOM) for this design. Table 6. PMP4775 List of Materials REF DES QTY VALUE DESCRIPTION SIZE PART NUMBER MFR C1, C2 2 10 mF Capacitor, ceramic, 6.3 V, X5R, 10% 0603 C1608X5R0J106KT TDK L1 1 2.2 mH Inductor, SMT, 1.5A, 110 mΩ 0.102" x 0.110" VLF3010AT-2R2M1R0 TDK R1 1 453 kΩ Resistor, chip, 1/16W, 1% 0603 Std Std R2 1 100 kΩ Resistor, chip, 1/16-W, 1% 0603 Std Std U1 1 3-MHz synchronous step-down converter, 500-mA, adjustable QFN-10 TPS62300DRC TI SLVA332A – October 2009 – Revised June 2010 3.6-V to 6-V Input, 3.3-V Output, Tiny, and High-Efficiency DC/DC Converter Copyright © 2009–2010, Texas Instruments Incorporated 5 Test Results 5 www.ti.com Test Results The input and output startup waveforms are shown in Figure 1 through Figure 4. The output ripple voltage is shown in Figure 5. Figure 6 shows the transient response. The switching node waveform is shown in Figure 7. 5.1 6 Test Results Figure 1. Startup Figure 2. Startup Figure 3. Startup Figure 4. Startup 3.6-V to 6-V Input, 3.3-V Output, Tiny, and High-Efficiency DC/DC Converter SLVA332A – October 2009 – Revised June 2010 Copyright © 2009–2010, Texas Instruments Incorporated Test Results www.ti.com VIN = 3.3 V Load Step 250 mA to 500 mA VOUT (50 mV/div) IOUT (200 mA/div) t – Time – 5 ms/div Figure 5. Output Ripple Voltage Figure 6. Load Transient Figure 7. Switching Node Waveform Figure 8. Switching Node Waveform SLVA332A – October 2009 – Revised June 2010 3.6-V to 6-V Input, 3.3-V Output, Tiny, and High-Efficiency DC/DC Converter Copyright © 2009–2010, Texas Instruments Incorporated 7 Test Results www.ti.com EFFICIENCY vs OUTPUT CURRENT 94 VOUT = 3.3 V VIN = 5 V 93 h – Efficiency – % 92 91 90 89 88 87 86 85 0 0.1 0.2 0.3 0.4 0.5 IOUT – Output Current – A Figure . Figure 9. 8 3.6-V to 6-V Input, 3.3-V Output, Tiny, and High-Efficiency DC/DC Converter SLVA332A – October 2009 – Revised June 2010 Copyright © 2009–2010, Texas Instruments Incorporated IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and applications using TI components. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from TI under the patents or other intellectual property of TI. Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional restrictions. Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in such safety-critical applications. TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use. TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated products in automotive applications, TI will not be responsible for any failure to meet such requirements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: Products Applications Amplifiers amplifier.ti.com Audio www.ti.com/audio Data Converters dataconverter.ti.com Automotive www.ti.com/automotive DLP® Products www.dlp.com Communications and Telecom www.ti.com/communications DSP dsp.ti.com Computers and Peripherals www.ti.com/computers Clocks and Timers www.ti.com/clocks Consumer Electronics www.ti.com/consumer-apps Interface interface.ti.com Energy www.ti.com/energy Logic logic.ti.com Industrial www.ti.com/industrial Power Mgmt power.ti.com Medical www.ti.com/medical Microcontrollers microcontroller.ti.com Security www.ti.com/security RFID www.ti-rfid.com Space, Avionics & Defense www.ti.com/space-avionics-defense RF/IF and ZigBee® Solutions www.ti.com/lprf Video and Imaging www.ti.com/video Wireless www.ti.com/wireless-apps Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2010, Texas Instruments Incorporated