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LTC3526B Datasheet(PDF) 11 Page - Linear Technology |
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LTC3526B Datasheet(HTML) 11 Page - Linear Technology |
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11 / 16 page  LTC3526/LTC3526B 3526bfd inductor current without saturating. Molded chokes and some chip inductors usually do not have enough core area to support the peak inductor currents of 700mA seen on the LTC3526/LTC3526B. To minimize radiated noise, use a shielded inductor. See Table 1 for suggested components and suppliers. Table 1. Recommended Inductors VENDOR PART/STYLE Coilcraft (847) 639-6400 www.coilcraft.com LPO4815 LPS4012, LPS4018 MSS5131 MSS4020 MOS6020 ME3220 DS1605, DO1608 Coiltronics www.cooperet.com SD10, SD12, SD14, SD18, SD20, SD52, SD3114, SD3118 FDK (408) 432-8331 www.fdk.com MIP3226D4R7M, MIP3226D3R3M MIPF2520D4R7 MIPWT3226D3R0 Murata (714) 852-2001 www.murata.com LQH43C LQH32C (-53 series) 301015 Sumida (847) 956-0666 www.sumida.com CDRH5D18 CDRH2D14 CDRH3D16 CDRH3D11 CR43 CMD4D06-4R7MC CMD4D06-3R3MC Taiyo-Yuden www.t-yuden.com NP03SB NR3015T NR3012T TDK (847) 803-6100 www.component.tdk.com VLP VLF, VLCF Toko (408) 432-8282 www.tokoam.com D412C D518LC D52LC D62LCB Würth (201) 785-8800 www.we-online.com WE-TPC type S, M 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 10µF 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. X5R and X7R dielectric materials are preferred for their ability to maintain capacitance over wide voltage and temperature ranges. Y5V types should not be used. TheinternalloopcompensationoftheLTC3526isdesigned tobestablewithoutputcapacitorvaluesof4.7µForgreater (withouttheneedforanyexternalseriesresistor).Although ceramic capacitors are recommended, low ESR tantalum capacitors may be used as well. A small ceramic capacitor in parallel with a larger tantalum capacitormaybeusedindemandingapplicationsthathave large load transients. Another method of improving the transientresponseistoaddasmallfeed-forwardcapacitor across the top resistor of the feedback divider (from VOUT to FB). A typical value of 22pF will generally suffice. 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 possible to the device. A 2.2µF input capacitor is sufficient for most applications, although larger values may be used without limitations. Table 2 shows a list of several ceramiccapacitormanufacturers.Consultthemanufactur- ers directly for detailed information on their selection of ceramic capacitors. Table 2. Capacitor Vendor Information SUPPLIER PHONE WEBSITE AVX (803) 448-9411 www.avxcorp.com Murata (714) 852-2001 www.murata.com Taiyo-Yuden (408) 573-4150 www.t-yuden.com TDK (847) 803-6100 www.component.tdk.com Samsung (408) 544-5200 www.sem.samsung.com applicaTions inFormaTion |
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