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LTC3523-2 Datasheet(PDF) 10 Page - Linear Technology |
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LTC3523-2 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 16 page  LTC3523/LTC3523-2 10 3523fb frequency ferrite core inductor materials reduce frequency dependent power losses compared to cheaper powdered iron types, improving efficiency. The inductor should have low ESR (series resistance of the windings) to reduce the I2R power losses, and must be able to handle the peak inductor current without saturating. Molded chokes and some chip inductors usually do not have enough core to support the peak inductor currents of 1000mA seen on the LTC3523/LTC3523-2. To minimize radiated noise, use a toroid, pot core or shielded bobbin inductor. See Table 1 for suggested inductors and suppliers. Step-Up: For the step-up converter a minimum inductance value of 3.3μH is recommended for 3.6V and lower output voltage applications, and a 4.7μH for output voltages greater than 3.6V. Larger values of inductance will allow greater output current capability by reducing the inductor ripple current. Increasing the inductance above 10μH will increase size while providing little improvement in output current capability. Step-Down: For most applications, the value of the inductor will fall in the range of 3.3μH to 10μH, depending upon the amount of current ripple desired. A reasonable point to start is to set the current ripple at 30% of the output current. Note that larger values of inductance will allow greater output current capability by reducing the inductor ripple current. Increasing the inductance above 10μH will increase size while providing little improvement in output current capability. A 4.7μH inductor will work well for most Li-Ion or 2-cell alkaline/NiMH cell applications 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. Step-Up: A 2.2μF 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. An additional phase lead capacitor con- nected between VOUT and FB1 may be required with output capacitors larger than 10μF to maintain acceptable phase margin. X5R and X7R dielectric materials are preferred for their ability to maintain capacitance over wide voltage and temperature ranges. Step-Down: 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. Table 2 shows the range of acceptable capacitors for a given programmed output voltage. Minimum capacitance values in the table APPLICATIONS INFORMATION Table 1. Recommended Inductors PART L (μH) MAXIMUM CURRENT (mA) DCR ( Ω) DIMENSIONS (mm) (L × W × H) MANUFACTURER ME3220 4.7 to 15 1200 to 700 0.19 to 0.52 3.2 × 2.5 × 2.0 Coil Craft www.coilcraft.com LPS3010 4.7 to 10 720 to 510 0.3 to 0.54 3.0 × 3.0 × 1.0 DO2010 4.7 to 15 800 to 510 0.8 to 1.84 2.0 × 2.0 × 1.0 SD3112 4.7 to 15 740 to 405 0.25 to 0.65 3.1 × 3.1 × 1.2 Cooper www.cooperet.com MIP3226D 4.7 to 10 600 to 200 0.1 to 0.16 3.2 × 2.6 × 1.0 FDK www.fdk.com LQH32CN 4.7 to 15 650 to 300 0.15 to 0.58 3.2 × 2.5 × 1.5 Murata www.murata.com LQH2MC 4.7 to 15 300 to 200 0.8 to 1.6 2 × 1.6 × 0.9 CDRH3D16 4.7 to 15 900 to 450 0.11 to 0.29 3.8 × 3.8 × 1.8 Sumida www.sumida.com CDRH2D14 4.7 to 12 680 to 420 0.12 to 0.32 3.2 × 3.2 × 1.5 NR3010 4.7 to 15 750 to 400 0.19 to 0.74 3.0 × 3.0 × 1.0 Taiyo Yuden www.t-yuden.com NR3015 4.7 to 15 1000 to 560 0.12 to 0.36 3.0 × 3.0 × 1.5 |
Similar Part No. - LTC3523-2 |
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Similar Description - LTC3523-2 |
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