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LTC3531-3 Datasheet(PDF) 11 Page - Linear Technology |
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LTC3531-3 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 16 page  LTC3531/ LTC3531-3.3/LTC3531-3 11 3531fb S I FOR ATIO APPLICATIO Table 3. Capacitor Vendor Information Supplier Series Phone Website AVX X5R (803) 448-9411 www.avxcorp.com Murata X5R USA: (814) 237-1431 www.murata.com (800) 831-9172 Sanyo POSCAP (619) 661-6322 www.sanyovideo.com Taiyo Yuden X5R (408) 573-4150 www.taiyo-yuden.com TDK X5R (847) 803-6100 www.component.tdk.com Component Selection Only three power components are required to complete the design of the buck-boost converter, VOUT programming resistors are needed for the adjustable version. The high operating frequency and low peak currents of the LTC3531 allow the use of low value, low profile inductors and tiny external ceramic capacitors. Inductor Selection For best efficiency, choose an inductor with high frequency core material, such as ferrite, to reduce core loses. The inductor should have low DCR (DC resistance) to reduce the I2R losses, and must be able to handle the peak inductor current without saturating. A 10μH to 22μH in- ductor value with a >500mA current rating and <400mΩ DCR is recommended. For applications where radiated noise is a concern, a toroidal or shielded inductor can be used. Table 2 contains a list of inductor manufacturers. Capacitor Selection The buck-boost convertor requires two capacitors. Ceramic X5R types will minimize ESL and ESR while maintaining capacitance at rated voltage over temperature. The VIN capacitor should be at least 2.2μF. The VOUT capacitor should be between 4.7μF and 22μF. A larger output capaci- tor should be used if lower peak to peak output voltage ripple is desired. A larger output capacitor will also improve load regulation on VOUT. See Table 3 for a list of capacitor manufacturers for input and output capacitor selection. Table 2. Inductor Vendor Information Supplier Series Phone Website COEV DN4835 (800) 227-7040 www.coev.net Coilcraft MSS4020 (847) 639-6400 www.coilcraft.com LPO3310 DS1608 Murata LQH43CN USA: (814) 237-1431 www.murata.com LQH32CN (800) 831-9172 Sumida CDRH4D18 USA: (847) 956-0666 www.sumida.com CDRH3D16/HP Japan: 81-3-3607-5111 Toko D312C (847) 297-0070 www.tokoam.com D412C DB320C |
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