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LT3466 Datasheet(PDF) 11 Page - Linear Technology |
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LT3466 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 20 page  11 LT3466 3466fa APPLICATIO S I FOR ATIO INDUCTOR SELECTION The choice of the inductor will depend on the selection of the switching frequency of the LT3466. The switching frequency can be programmed from 200kHz to 2MHz. Higher switching frequency allows the use of smaller inductors albeit at the cost of increased switching losses. The inductor current ripple ( ∆IL), neglecting the drop across the Schottky diode and the switch, is given by : ∆ = () I VV V Vf L L IN MIN OUT MAX IN MIN OUT MAX () ( ) () () •– •• where: L = Inductor f = Operating frequency VIN(MIN) = Minimum input voltage VOUT(MAX) = Maximum output voltage The ∆IL is typically set to 20% to 40% of the maximum inductor current. The inductor should have a saturation current rating greater than the peak inductor current required for the application. Also, ensure that the inductor has a low DCR (copper wire resistance) to minimize I2R power losses. Recommended inductor values range from 10 µH to 68µH. Several inductors that work well with the LT3466 are listed in Table 1. Consult each manufacturer for more detailed information and for their entire selection of related parts. Table 1. Recommended Inductors MAX CURRENT L DCR RATING PART ( µH) ( Ω) (mA) VENDOR LQH32CN100 10 0.44 300 Murata LQH32CN150 15 0.58 300 (814) 237-1431 LQH43CN330 33 1.00 310 www.murata.com ELL6RH330M 33 0.38 600 Panasonic ELL6SH680M 68 0.52 500 (714) 373-7939 www.panasonic.com A914BYW330M 33 0.45 440 Toko A914BYW470M 47 0.73 360 www.toko.com A920CY680M 68 0.40 400 CDRH2D18150NC 15 0.22 350 Sumida CDRH4D18-330 33 0.51 310 (847) 956-0666 CDRH5D18-680 68 0.84 430 www.sumida.com CAPACITOR SELECTION The small size of ceramic capacitors make them ideal for LT3466 applications. Use only X5R and X7R types be- cause they retain their capacitance over wider voltage and temperature ranges than other types such as Y5V or Z5U. A 1 µF input capacitor is sufficient for most applications. Always use a capacitor with sufficient voltage rating. Table 2 shows a list of several ceramic capacitor manufac- turers. Consult the manufacturers for detailed information on their entire selection of ceramic parts. Table 2. Ceramic Capacitor Manufacturers Taiyo Yuden (408) 573-4150 www.t-yuden.com AVX (803) 448-9411 www.avxcorp.com Murata (714) 852-2001 www.murata.com INRUSH CURRENT The LT3466 has built-in Schottky diodes. When supply voltage is applied to the VIN pin, an inrush current flows through the inductor and the Schottky diode and charges up the output voltage. Both the Schottky diodes in the LT3466 can sustain a maximum of 1A current. The selec- tion of inductor and capacitor value should ensure the peak of the inrush current to be below 1A. For low DCR inductors, which is usually the case for this application, the peak inrush current can be simplified as follows: I V L where LC PK IN OUT = = –. : 06 1 ω ω Table 3 gives inrush peak current for some component selections. |
Similar Part No. - LT3466_15 |
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Similar Description - LT3466_15 |
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