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LM3242TMX/NOPB Datasheet(PDF) 18 Page - Texas Instruments |
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LM3242TMX/NOPB Datasheet(HTML) 18 Page - Texas Instruments |
18 / 32 page ![]() LM3242 SNOSB48E – OCTOBER 2011 – REVISED AUGUST 2015 www.ti.com Table 3. Suggested Inductors MODEL SIZE (W × L × H) (mm) VENDOR MIPSZ2012D0R5 2 × 1.2 × 1 FDK LQM21PNR54MG0 2 × 1.25 × 0.9 Murata LQM2MPNR47NG0 2 × 1.6 × 0.9 Murata CIG21LR47M 2 × 1.25 × 1 Samsung CKP2012NR47M 2 × 1.25 × 1 Taiyo Yuden 8.2.2.2 Capacitor Selection The LM3242 is designed for use with ceramic capacitors for its input and output filters. Use a 10-µF ceramic capacitor for input and a sum total of 4.7-µF ceramic capacitors for the output. They must maintain at least 50% capacitance at DC bias and temperature conditions. Ceramic capacitors types such as X5R, X7R, and B are recommended for both filters. These provide an optimal balance between small size, cost, reliability and performance for cell phones and similar applications. Table 4 lists some suggested part numbers and suppliers. DC bias characteristics of the capacitors must be considered when selecting the voltage rating and case size of the capacitor. If it is necessary to choose a 0603 (1608) size capacitor for VIN and 0402 (1005) size capacitor for VOUT, the operation of the LM3242 must be carefully evaluated on the system board. Use of a 2.2-µF capacitor in conjunction with multiple 0.47 µF or 1 µF capacitors in parallel may also be considered when connecting to power amplifier devices that require local decoupling. Table 4. Suggested Capacitors and Their Suppliers CAPACITANCE MODEL SIZE (W × L) (mm) VENDOR 2.2 µF GRM155R60J225M 1 × 0.5 Murata 2.2 µF C1005X5R0J225M 1 × 0.5 TDK 2.2 µF CL05A225MQ5NSNC 1 × 0.5 Samsung 4.7 µF C1608JB0J475M 1.6 × 0.8 TDK 4.7 µF C1005X5R0J475M 1 × 0.5 TDK 4.7 µF CL05A475MQ5NRNC 1 × 0.5 Samsung 10 µF C1608X5R0J106M 1.6 × 0.8 TDK 10 µF GRM155R60J106M 1 × 0.5 Murata 10 µF CL05A106MQ5NUNC 1 × 0.5 Samsung The input filter capacitor supplies AC current drawn by the PFET switch of the LM3242 in the first part of each cycle and reduces the voltage ripple imposed on the input power source. The output filter capacitor absorbs the AC inductor current, helps maintain a steady output voltage during transient load changes and reduces output voltage ripple. These capacitors must be selected with sufficient capacitance and sufficiently low Equivalent Series Resistance (ESR) to perform these functions. The ESR of the filter capacitors is generally a major factor in voltage ripple. 18 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: LM3242 |
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