LMZ12001,LMZ12002,LMZ12003,LMZ14201, LMZ14202,LMZ14203 Application Note 2024 LMZ1420x / LMZ1200x Evaluation Board Literature Number: SNVA422D National Semiconductor Application Note 2024 Alan Martin March 26, 2010 Introduction Board Specifications The LMZ1420x and LMZ1200x SIMPLE SWITCHER(R) 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 LMZ14203/2/1 can accept an input voltage rail between 6V and 42V and the LMZ12003/2/1 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 LMZ1420x and LMZ1200x 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 prebiased output. * * * * * * * * * LMZ1420x VIN = 6V to 42V LMZ1420x enable UVLO = 8V LMZ1420x VOUT = 3.3V LMZ1200x VIN = 4.5V to 20V LMZ1200x enable UVLO = 4.5V LMZ1200x VOUT = 1.8V Operates at full load up to 80C ambient at 12V input JA = 20C / W, JC = 1.9C / 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 LMZ1420x or LMZ1200x data sheet. For negative output voltage connections see AN-2027. 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. AN-2024 30112201 FIGURE 1. Evaluation Board Schematic (LMZ12003 1.8V application values shown in parentheses) (c) 2010 National Semiconductor Corporation 301122 LMZ1420x / LMZ1200x Evaluation Board LMZ1420x / LMZ1200x Evaluation Board www.national.com AN-2024 TABLE 1. LMZ1420x Bill of Materials, VIN = 8V to 42V, VOUT = 3.3V, IOUT (MAX) = 3A / 2A / 1A Designator Description Case Size Manufacturer Manufacturer P/N Quantity U1 SIMPLE SWITCHER(R) TO-PMOD-7 National Semiconductor LMZ14203TZ-ADJ or LMZ14202TZ-ADJ or LMZ14201TZ-ADJ 1 CIN4, CO1 1 F, X7R, 50V 1206 Taiyo Yuden UMK316B7105KL-T 2 CIN2 10 F, X5R, 50V 1210 Taiyo Yuden UMK325BJ106MM-T 1 CO2 100 F, X5R, 6.3V 1210 Taiyo Yuden JMK325BJ107MM-T 1 CSS, CFF 0.022 F, X7R, 100V 0805 AVX 08051C223JAT2A 2 RENB 11.8k 0805 Panasonic ERJ-6ENF1182V 1 RENT 68.1 k 0805 Panasonic ERJ-6ENF6812V 1 RFBT 3.32 k 0805 Vishay-Dale CRCW08053K32FKEA 1 RFBB 1.07 k 0805 Panasonic CRCW080534K8FKEA 1 RON 61.9 k 0805 Panasonic ERJ-6ENF6192V 1 TABLE 2. LMZ1200x Bill of Materials, VIN = 4.5 to 20V, VOUT = 1.8V, IOUT (MAX) = 3A / 2A / 1A Designator Description Case Size Manufacturer Manufacturer P/N Quantity U1 SIMPLE SWITCHER(R) TO-PMOD-7 National Semiconductor LMZ12003TZ-ADJ or LMZ12002TZ-ADJ or LMZ12001TZ-ADJ 1 CIN4, CO1 1 F, X7R, 50V 1206 Taiyo Yuden UMK316B7105KL-T 2 CIN2 10 F, X5R, 50V 1210 Taiyo Yuden UMK325BJ106MM-T 1 CO2 100 F, X5R, 6.3V 1210 Taiyo Yuden JMK325BJ107MM-T 1 CSS, CFF 0.022 F, X7R, 100V 0805 AVX 08051C223JAT2A 2 RENB 11.8k 0805 Panasonic ERJ-6ENF1182V 1 RENT 32.4K 0805 Panasonic ERJ-6ENF3242V 1 RFBT 1.87 k 0805 Vishay-Dale CRCW08051K87FKEA 1 RFBB 1.50 k 0805 Panasonic CRCW08051K50FKEA 1 RON 32.4K 0805 Panasonic ERJ-6ENF3242V 1 Performance Characteristics LMZ14203 Load Regulation LMZ12003 Load Regulation 30112204 30112205 www.national.com 2 AN-2024 LMZ14203 Efficiency LMZ12003 Efficiency 30112202 30112203 LMZ14202 Efficiency LMZ12002 Efficiency 30112220 30112221 LMZ14201 Efficiency LMZ12001 Efficiency 30112222 30112223 3 www.national.com AN-2024 LMZ14203 Thermal Derating LMZ12003 Thermal Derating 30112215 30112216 LMZ14202 Thermal Derating LMZ12002 Thermal Derating 30112224 30112225 LMZ14201 Thermal Derating LMZ12001 Thermal Derating 30112227 30112226 www.national.com 4 AN-2024 LMZ14203 Current Limit VOUT = 3.3V LMZ12003 Current Limit VOUT = 1.8V 30112228 30112229 LMZ14202 Current LimitVOUT = 3.3V LMZ12002 Current Limit VOUT = 1.8V 30112230 30112231 LMZ14201 Current Limit VOUT = 3.3V LMZ12001 Current Limit VOUT = 1.8V 30112233 30112232 5 www.national.com AN-2024 LMZ14203 Startup VIN = 12V LMZ12003 Startup VIN = 12V 30112235 30112234 LMZ14203 Output Ripple VOUT = 3.3V IOUT = 3A, BW = 200 MHz LMZ14203 Transient Response VIN = 24V VOUT = 3.3V, 0.6 A to 3A Step 30112218 30112217 PCB Layout Diagrams Gerber and CAD files can be download from the LMZ14203 product folder. 30112209 FIGURE 2. Top Layer www.national.com 6 AN-2024 30112210 FIGURE 3. Internal Layer I (Ground) Heat Sinking Layer 30112211 FIGURE 4. Internal Layer II (Ground) Heat Sinking Layer 30112212 FIGURE 5. Bottom Layer (Ground and Routing) Heat Sinking Layer 7 www.national.com AN-2024 30112213 FIGURE 6. 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