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. 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