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GRM31CR71H225KA88 Datasheet(PDF) 7 Page - Linear Integrated Systems |
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GRM31CR71H225KA88 Datasheet(HTML) 7 Page - Linear Integrated Systems |
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7 / 16 page  LT3591 7 3591f INDUCTOR SELECTION A 22µH inductor is recommended for most LT3591 ap- plications. Although small size and high efficiency are major concerns, the inductor should have low core losses at 1MHz and low DCR (copper wire resistance). Some small inductors in this category are listed in Table 1. The efficiency comparison of different inductors is shown in Figure 3. Table 1. Recommended Inductors PART L (µH) CURRENT RATING (mA) MAX DIMENSION L × W × H (mm) VENDOR VLF4012AT- 220MR51 22 510 4 × 3.8 × 1.2 TDK www.tdk.com VLCF4018T- 220MR49-2 22 490 4.1 × 4.1 × 1.8 VLCF4020T- 220MR56 22 560 4.1 × 4.1 × 2 LQH43CN220K03 22 420 4.8 × 3.4 × 2.8 Murata www.murata.com NR4018T220M 22 590 4.2 × 4.2 × 1.8 Taiyo Yuden www.t-yuden.com NR4012T220M 22 510 4.2 × 4.2 × 1.2 CDRH3D18- 220NC 22 600 4 × 4 × 2 Sumida www.sumida.com B82470-A1223-M 22 480 4.8 × 4.8 × 1.2 Epcos www.epcos.com APPLICATIONS INFORMATION CAPACITOR SELECTION The small size of ceramic capacitors make them ideal for LT3591 applications. Use only X5R and X7R types because they retain their capacitance over wider temperature ranges than other types such as Y5V or Z5U. A 1µF input capacitor and a 50V, 2.2µF output capacitor are sufficient for most applications. A limited number of manufacturers produce small 50V capacitors. Table 2 shows a list of several recommended 50V capacitors. Consult the manufacturer for detailed information on their entire selection of ceramic parts. Table 2. Recommended Output Capacitors PART C (µF) VOLTAGE CASE SIZE VENDOR TEMP. HEIGHT (mm) GRM21BR71H105KA12L 1 50V 0805 Murata www.murata.com X7R 1.25 ± 0.15 GRM31MR71H105KA88 1 50V 1206 X7R 1.15 ± 0.1 GRM31CR71H225KA88 2.2 50V 1206 X7R 1.6 ± 0.2 GRM31CR71H475KA12L 4.7 50V 1206 X7R 1.6 ± 0.2 UMK316BJ475KL-T 4.7 50V 1206 Taiyo Yuden www.t-yuden.com X7R 1.6 ± 0.2 Figure 3. Efficiency Comparison of Different Inductors LED CURRENT (mA) 0 50 55 85 80 65 5 10 3591 F03 70 75 60 15 20 TAIYO YUDEN NR4018T220M TDK VLCF4018T-220MR49-2 TAIYO YUDEN NR4012T220M TDKVLCF4012AT-220MR51 MURATA LQH43CN220K03 TDK VLCF4020T-220MR56 SUMIDA CDRH3D18-220NC EPCOS B82470-A1223-M VIN = 3.6V 10 LEDs |
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