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LTC3429 Datasheet(PDF) 9 Page - Linear Technology |
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LTC3429 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page LTC3429/LTC3429B 9 3429fa The inductor current ripple is typically set for 20% to 40% of the maximum inductor current (IP). High frequency ferrite core inductor materials reduce frequency dependent power losses compared to cheaper powdered iron types, improving efficiency. The inductor should have low ESR (series resistance of the windings) to reduce the I2R power losses, and must be able to handle the peak inductor current without saturating. Molded chokes and some chip inductors usually do not have enough core to support the peak inductor currents of 850mA seen on the LTC3429/LTC3429B. To minimize radiated noise, use a toroid, pot core or shielded bobbin inductor. See Table 1 for some suggested components and suppliers. Table 1. Recommended Inductors MAX L DCR HEIGHT PART (µH) mΩ (mm) VENDOR CDRH5D18-4R1 4.1 57 2.0 Sumida CDRH5D18-100 10 124 2.0 www.sumida.com CDRH3D16-4R7 4.7 105 1.8 CDRH3D16-6R8 170 1.8 CR43-4R7 4.7 109 3.5 CR43-100 10 182 3.5 CMD4D06-4R7MC 4.7 216 0.8 CMD4D06-3R3MC 3.3 174 0.8 DS1608-472 4.7 60 2.9 Coilcraft DS1608-103 10 75 2.9 www.coilcraft.com DO1608C-472 4.7 90 2.9 D52LC-4R7M 4.7 84 2.0 Toko D52LC-100M 10 137 2.0 www.tokoam.com LQH32CN4R7M24 4.7 195 2.2 Murata www.murata.com Output and Input Capacitor Selection Low ESR (equivalent series resistance) capacitors should be used to minimize the output voltage ripple. Multilayer ceramic capacitors are an excellent choice as they have extremely low ESR and are available in small footprints. A 4.7µF to 15µF output capacitor is sufficient for most applications. Larger values up to 22µF may be used to obtain extremely low output voltage ripple and improve transient response. An additional phase lead capacitor may be required with output capacitors larger than 10µF to maintain acceptable phase margin. X5R and X7R dielectric materials are preferred for their ability to main- tain capacitance over wide voltage and temperature ranges. Low ESR input capacitors reduce input switching noise and reduce the peak current drawn from the battery. It follows that ceramic capacitors are also a good choice for input decoupling and should be located as close as pos- sible to the device. A 10µF input capacitor is sufficient for virtually any application. Larger values may be used with- out limitations. Table 2 shows a list of several ceramic capacitor manufacturers. Consult the manufacturers di- rectly for detailed information on their entire selection of ceramic capacitors. Table 2. Capacitor Vendor Information SUPPLIER WEBSITE AVX www.avxcorp.com Murata www.murata.com Taiyo Yuden www.t-yuden.com APPLICATIO S I FOR ATIO |
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