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LT3495-1 Datasheet(PDF) 9 Page - Linear Technology |
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LT3495-1 Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  LT3495/LT3495B/ LT3495-1/LT3495B-1 9 3495b1b1fa APPLICATIONS INFORMATION Inductor Selection Several inductors that work well with the LT3495/LT3495B are listed in Table 2 and those for the LT3495-1/LT3495B-1 are listed in Table 3. These tables are not complete, and there are many other manufacturers and devices that can be used. Consult each manufacturer for more detailed information and for their entire selection of related parts, as many different sizes and shapes are available. Inductorswithavalueof3.3µHorhigherarerecommended for most LT3495 series designs. Inductors with low core losses and small DCR (copper wire resistance) are good choices for LT3495 series applications. For full output power, the inductor should have a saturation current rating higher than the peak inductor current. The peak inductor current can be calculated as: IPK =ILIMIT + VIN •200•10–9 L amps where ILIMIT is 0.65A and 0.35A for LT3495/LT3495B and LT3495-1/LT3495B-1 respectively. L is the inductance value in Henrys and VIN is the input voltage to the boost circuit. Table 2. Recommended Inductors for LT3495/LT3495B PART L (µH) DCR (mΩ) SIZE (mm) VENDOR LPS4018-103ML MSS5131-103MLC LPS3015-472MLC LPS3015-682MLC 10 10 4.7 6.8 200 83 200 300 4.4 × 4.4 × 1.7 5.1 × 5.1 × 3.1 3.0 × 3.0 × 1.5 3.0 × 3.0 × 1.5 Coilcraft www.coilcraft.com LQH43CN4R7M03 4.7 150 4.5 × 3.2 × 2.8 Murata www.murata.com CR32-6R8 6.8 202 4.1 × 3.7 × 3.0 Sumida www.sumida.com 744031004 4.7 105 3.8 × 3.8 × 1.7 Wurth Elektronik www.we-online.com Capacitor Selection The small size and low ESR of ceramic capacitors makes them suitable for most LT3495 series applications. X5R and X7R types are recommended because they retain their capacitance over wider voltage and temperature ranges than other types such as Y5V or Z5U. A 4.7µF input capacitor and a 1µF to 10µF output capacitor are sufficient for most applications. Always use a capacitor with a sufficient voltage rating. Many capacitors rated at 1µF to 10µF, particularly 0603 case sizes, have greatly reduced capacitance when bias voltages are applied. Be sure to check actual capacitance at the desired output voltage. Generally a 0805 or 1206 size capacitor will be adequate. A 2.2µF capacitor placed on the CAP node is recommended to filter the inductor current while a 1µF to 10µF capacitor placed on the VOUT node will give excellent transient response and stability. Table 4 shows a list of several capacitor manufacturers. Consult the manufac- turers for more detailed information and for their entire selection of related parts. Table 3. Recommended Inductors for LT3495-1/LT3495B-1 PART L (µH) DCR (mΩ) SIZE (mm) VENDOR LPO4815-472MLC LPO4815-682MLC LPO4815-103MLC LPS3008-472MLC LPS3008-682MLC LPS3008-103MLC 4.7 6.8 10 4.7 6.8 10 150 180 230 350 500 650 4.8 × 4.8 × 1.5 4.8 × 4.8 × 1.5 4.8 × 4.8 × 1.5 3.0 × 3.0 × 0.8 3.0 × 3.0 × 0.8 3.0 × 3.0 × 0.8 Coilcraft www.coilcraft.com LQH32CN4R7M53 LQH32CN100K33 4.7 10 150 300 3.2 × 2.5 × 1.6 3.2 × 2.5 × 2.0 Murata www.murata.com CDH28D09/S-6R2 6.2 369 3.3 × 3.0 × 1.0 Sumida www.sumida.com 744030004 4.7 290 3.5 × 3.3 × 1.0 Wurth Elektronik www.we-online.com Table 4. Recommended Ceramic Capacitor Manufacturers MANUFACTURER PHONE WEBSITE Taiyo Yuden (408) 573-4150 www.t-yuden.com AVX (843) 448-9411 www.avxcorp.com Murata (814) 237-1431 www.murata.com Kemet (408) 986-0424 www.kemet.com TDK (847) 803-6100 www.tdk.com Diode Selection Schottky diodes, with their low forward voltage drops and fast switching speeds, are recommended for use with the LT3495 series. The Diodes Inc. B0540WS-7 is a very good choice. This diode is rated to handle an average forward current of 0.5A with 40V reverse breakdown. |
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