LMZ14201EXTEVAL/NOPB

User's Guide SNVA456A – August 2010 – Revised April 2013 AN-2084 LMZ1420xEXT / LMZ1200xEXT Evaluation Board 1 Introduction The LMZ1420xEXT and LMZ1200xEXT SIMPLE SWITCHER® power modules are easy-to-use DC-DC solution capable of driving up to a 3A load with exceptional power conversion efficiency, output voltage accuracy, line and load regulation. They are available in an innovative package that enhances thermal performance and allows for hand or machine soldering. The LMZ14203EXT/2EXT/1EXT can accept an input voltage rail between 6V and 42V and the LMZ12003EXT/2EXT/1EXT can accept an input voltage rail between 4.5V and 20V. The devices can deliver an adjustable and highly accurate output voltage as low as 0.8V and as high as 6V. The control structure is constant on-time with input voltage feed forward. This creates a nearly constant switching frequency across the input voltage range. The control loop operates well with low ESR output capacitors such as ceramics. An output feed-forward capacitor across the upper feedback resistor trims for optimum transient response. The precision enable input allows for programmable UVLO of the input supply. The external soft-start capacitor facilitates controlled startup output rise time. The LMZ1420xEXT and LMZ1200xEXT family is a reliable and robust solution with the following features: lossless cycle-by-cycle valley current limit to protect for over current or short-circuit fault, thermal shutdown, input under-voltage lock-out, and will start up into a pre-biased output. The LMZ1420xEXT and LMZ1200xEXT families are shock and vibration certified and rated for operation down to –55°C. 2 Board Specifications • • • • • • • • • • • LMZ1420xEXT VIN = 6V to 42V LMZ1420xEXT enable UVLO = 8V LMZ1420xEXT VOUT = 3.3V LMZ1200xEXT VIN = 4.5V to 20V LMZ1200xEXT enable UVLO = 4.5V LMZ1200xEXT VOUT = 1.8V Operates at full load up to 80°C ambient at 12V input θJA = 20°C / W, θJC = 1.9°C / W Designed on four layers, all four layers are 1 oz. copper weight The two internal ground planes are identical Measures 1.705 in. x 3.03 in. (4.33 cm x 7.7cm) and is 62mil (.062”) thick of FR4 laminate material For additional circuit modifications refer to the Design Consideration section of the LMZ1420xEXT or LMZ1200xEXT data sheet. For negative output voltage connections see AN-2027. 3 Additional Footprints Additional component mounting pads are available to experiment with alternative Cin and Cout combinations or a zener clamp on the enable input. See Figure 6 for corresponding schematic locations. All trademarks are the property of their respective owners. SNVA456A – August 2010 – Revised April 2013 Submit Documentation Feedback AN-2084 LMZ1420xEXT / LMZ1200xEXT Evaluation Board Copyright © 2010–2013, Texas Instruments Incorporated 1 Additional Footprints www.ti.com U1 EP VIN VOUT FB SS GND EN 3.3VOUT @ 3A (1.8VOUT @ 3A) 7 6 5 2 1 RENT 68.1 k: (32.4 k:) 4 RON LMZ1420xEXTTZ (LMZ1200xEXTTZ) 6V to 42V (4.5V to 20V) VIN UVLO @ 8V (UVLO @ 4.4V) 3 Enable CFF 0.022 PF RON 61.9 k: (32.4 k:) RFBT 3.32 k: (1.87 k:) RENB 11.8 k: CIN2 10 PF CIN1 1 PF CSS 0.022 PF CO1 RFBB 1 PF 1.07 k: (1.50 k:) CO2 100 PF Figure 1. Evaluation Board Schematic (LMZ1200xEXT 1.8V application values shown in parentheses) 2 AN-2084 LMZ1420xEXT / LMZ1200xEXT Evaluation Board SNVA456A – August 2010 – Revised April 2013 Submit Documentation Feedback Copyright © 2010–2013, Texas Instruments Incorporated Bill of Materials www.ti.com 4 Bill of Materials Table 1. LMZ1420xEXT Bill of Materials, VIN = 8V to 42V, VOUT = 3.3V, IOUT (MAX) = 3A / 2A / 1A Designator Description Case Size Manufacturer Manufacturer P/N Quantit y U1 SIMPLE SWITCHER® PFM-7 Texas Instruments LMZ14203 or LMZ14202 or LMZ14201 1 CIN4, CO1 1 µF, X7R, 50V 1206 Taiyo Yuden UMK316B7105KL-T 2 CIN2 10 µF, X5R, 50V 1210 Taiyo Yuden UMK325BJ106MM-T 1 CO2 100 µF, X5R, 6.3V 1210 Taiyo Yuden JMK325BJ107MM-T 1 CSS, CFF 0.022 µF, X7R, 100V 0805 AVX 08051C223JAT2A 2 RENB 11.8k 0805 Panasonic ERJ-6ENF1182V 1 RENT 68.1 kΩ 0805 Panasonic ERJ-6ENF6812V 1 RFBT 3.32 kΩ 0805 Vishay-Dale CRCW08053K32FKEA 1 RFBB 1.07 kΩ 0805 Panasonic CRCW080534K8FKEA 1 RON 61.9 kΩ 0805 Panasonic ERJ-6ENF6192V 1 Table 2. LMZ1200xEXT Bill of Materials, VIN = 4.5 to 20V, VOUT = 1.8V, IOUT (MAX) = 3A / 2A / 1A Designator Description Case Size Manufacturer Manufacturer P/N Quantit y U1 SIMPLE SWITCHER® PFM-7 Texas Instruments LMZ12003 or LMZ12002 or LMZ12001 1 CIN4, CO1 1 µF, X7R, 50V 1206 Taiyo Yuden UMK316B7105KL-T 2 CIN2 10 µF, X5R, 50V 1210 Taiyo Yuden UMK325BJ106MM-T 1 CO2 100 µF, X5R, 6.3V 1210 Taiyo Yuden JMK325BJ107MM-T 1 CSS, CFF 0.022 µF, X7R, 100V 0805 AVX 08051C223JAT2A 2 RENB 11.8k 0805 Panasonic ERJ-6ENF1182V 1 RENT 32.4KΩ 0805 Panasonic ERJ-6ENF3242V 1 RFBT 1.87 kΩ 0805 Vishay-Dale CRCW08051K87FKEA` 1 RFBB 1.50 kΩ 0805 Panasonic CRCW08051K50FKEA 1 RON 32.4KΩ 0805 Panasonic ERJ-6ENF3242V 1 SNVA456A – August 2010 – Revised April 2013 Submit Documentation Feedback AN-2084 LMZ1420xEXT / LMZ1200xEXT Evaluation Board Copyright © 2010–2013, Texas Instruments Incorporated 3 Performance Characteristics 5 www.ti.com Performance Characteristics LMZ14203EXT Load and Line Regulation LMZ12003EXT Load and Line Regulation LMZ14203EXT Efficiency LMZ12003EXT Efficiency 100 100 95 6 8 12 15 20 90 EFFICIENCY (%) EFFICIENCY (%) 95 85 36 80 5 90 6 12 85 80 20 25°C VOUT = 3.3V 75 0 0.5 1 1.5 2 2.5 3 0 0.5 OUTPUT CURRENT (A) AN-2084 LMZ1420xEXT / LMZ1200xEXT Evaluation Board 1 1.5 2 2.5 3 OUTPUT CURRENT (A) LMZ14202EXT Efficiency 4 VOUT = 1.8V 25°C 75 LMZ12002EXT Efficiency SNVA456A – August 2010 – Revised April 2013 Submit Documentation Feedback Copyright © 2010–2013, Texas Instruments Incorporated Performance Characteristics www.ti.com LMZ14201EXT Efficiency LMZ12001EXT Efficiency 100 90 6 8 12 80 20 24 70 5 90 EFFICIENCY (%) EFFICIENCY (%) 100 36 6 8 80 12 70 20 42 60 60 50 0 0.2 0.4 VOUT = 1.8V 25°C VOUT = 3.3V 25°C 50 0.6 0.8 OUTPUT CURRENT (A) 1 0 0.2 0.4 0.6 0.8 OUTPUT CURRENT (A) LMZ14203EXT Thermal Derating LMZ12003EXT Thermal Derating LMZ14202EXT Thermal Derating LMZ12002EXT Thermal Derating SNVA456A – August 2010 – Revised April 2013 Submit Documentation Feedback 1 AN-2084 LMZ1420xEXT / LMZ1200xEXT Evaluation Board Copyright © 2010–2013, Texas Instruments Incorporated 5 Performance Characteristics www.ti.com LMZ14201EXT Thermal Derating LMZ12001EXT Thermal Derating 1.2 OUTPUT CURRENT (A) 1 4.5 Vin 0.8 12 Vin 0.6 20 Vin 0.4 ÆJA = 19.6°C/W 0.2 VOUT = 1.8V 0 50 60 70 80 90 100 110 120 AMBIENT TEMPERATURE (C) 6 LMZ14203EXT Current Limit VOUT = 3.3V LMZ12003EXT Current Limit VOUT = 1.8V LMZ14202EXT Current LimitVOUT = 3.3V LMZ12002EXT Current Limit VOUT = 1.8V AN-2084 LMZ1420xEXT / LMZ1200xEXT Evaluation Board SNVA456A – August 2010 – Revised April 2013 Submit Documentation Feedback Copyright © 2010–2013, Texas Instruments Incorporated Performance Characteristics www.ti.com LMZ14201EXT Current Limit VOUT = 3.3V LMZ12001EXT Current Limit VOUT = 1.8V 2.4 2.4 2.3 2.3 2.2 CURRENT (A) CURRENT (A) SHORT CIRCUIT 2.1 ONSET 2.0 1.9 2.2 SHORT CIRCUIT 2.1 2.0 ONSET 1.9 25°C 25°C 1.8 1.8 0 10 30 20 40 50 5 0 LMZ14203EXT Startup VIN = 12V 10 15 20 25 INPUT VOLTAGE (V) INPUT VOLTAGE (V) LMZ12003EXT Startup VIN = 12V ENABLE ENABLE VOUT = 3.3V @ 3A VOUT = 1.8V @ 3A 1.00 ms/DIV LMZ14203EXT Output Ripple VOUT = 3.3V IOUT = 3A, BW = 200 MHz SNVA456A – August 2010 – Revised April 2013 Submit Documentation Feedback 1.00 ms/DIV LMZ14203EXT Transient Response VIN = 24V VOUT = 3.3V, 0.6 A to 3A Step AN-2084 LMZ1420xEXT / LMZ1200xEXT Evaluation Board Copyright © 2010–2013, Texas Instruments Incorporated 7 PCB Layout Diagrams 6 www.ti.com PCB Layout Diagrams Gerber and CAD files can be download from the LMZ14203EXT product folder. Figure 2. Top Layer Figure 3. Internal Layer I (Ground) Heat Sinking Layer Figure 4. Internal Layer II (Ground) Heat Sinking Layer 8 AN-2084 LMZ1420xEXT / LMZ1200xEXT Evaluation Board SNVA456A – August 2010 – Revised April 2013 Submit Documentation Feedback Copyright © 2010–2013, Texas Instruments Incorporated PCB Layout Diagrams www.ti.com Figure 5. Bottom Layer (Ground and Routing) Heat Sinking Layer Figure 6. LMZ14203EXT PCB CAD package schematic DNS = Component not installed SNVA456A – August 2010 – Revised April 2013 Submit Documentation Feedback AN-2084 LMZ1420xEXT / LMZ1200xEXT Evaluation Board Copyright © 2010–2013, Texas Instruments Incorporated 9 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms and conditions of sale of semiconductor products. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarily performed. TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and applications using TI components. To minimize the risks associated with Buyers’ products and applications, Buyers should provide adequate design and operating safeguards. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right relating to any combination, machine, or process in which TI components or services are used. Information published by TI regarding third-party products or services does not constitute a license 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 significant portions 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. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional restrictions. Resale of TI components or services with statements different from or beyond the parameters stated by TI for that component or service voids all express and any implied warranties for the associated TI component or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. Buyer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety-related requirements concerning its products, and any use of TI components in its applications, notwithstanding any applications-related information or support that may be provided by TI. Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause harm and take appropriate remedial actions. Buyer will fully indemnify TI and its representatives against any damages arising out of the use of any TI components in safety-critical applications. In some cases, TI components may be promoted specifically to facilitate safety-related applications. With such components, TI’s goal is to help enable customers to design and create their own end-product solutions that meet applicable functional safety standards and requirements. Nonetheless, such components are subject to these terms. No TI components are authorized for use in FDA Class III (or similar life-critical medical equipment) unless authorized officers of the parties have executed a special agreement specifically governing such use. Only those TI components which TI has specifically designated as military grade or “enhanced plastic” are designed and intended for use in military/aerospace applications or environments. Buyer acknowledges and agrees that any military or aerospace use of TI components which have not been so designated is solely at the Buyer's risk, and that Buyer is solely responsible for compliance with all legal and regulatory requirements in connection with such use. TI has specifically designated certain components as meeting ISO/TS16949 requirements, mainly for automotive use. In any case of use of non-designated products, TI will not be responsible for any failure to meet ISO/TS16949. Products Applications Audio www.ti.com/audio Automotive and Transportation www.ti.com/automotive Amplifiers amplifier.ti.com Communications and Telecom www.ti.com/communications Data Converters dataconverter.ti.com Computers and Peripherals www.ti.com/computers DLP® Products www.dlp.com Consumer Electronics www.ti.com/consumer-apps DSP dsp.ti.com Energy and Lighting www.ti.com/energy Clocks and Timers www.ti.com/clocks Industrial www.ti.com/industrial Interface interface.ti.com Medical www.ti.com/medical Logic logic.ti.com Security www.ti.com/security Power Mgmt power.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video RFID www.ti-rfid.com OMAP Applications Processors www.ti.com/omap TI E2E Community e2e.ti.com Wireless Connectivity www.ti.com/wirelessconnectivity Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2013, Texas Instruments Incorporated