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LTC3601IMSE Datasheet(PDF) 11 Page - Linear Technology |
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LTC3601IMSE Datasheet(HTML) 11 Page - Linear Technology |
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11 / 24 page  LTC3601 11 3601f APPLICATIONS INFORMATION exceeded. This collapse will result in an abrupt increase in inductor ripple current, so it is important to ensure the core will not saturate. Different core materials and shapes will change the size/current and price/current relationship of an induc- tor. Toroid or shielded pot cores in ferrite or permalloy materials are small and don’t radiate much energy but generally cost more than powdered iron core inductors with similar characteristics. The choice of which style inductor to use mainly depends on the price versus size requirements and any radiated field/EMI requirements. New designs for surface mount inductors are available from Toko, Vishay, NEC/Tokin, Cooper, Coilcraft, TDK and Würth Electronik. Table 1 gives a sampling of available surface mount inductors. Table 1. Inductor Selection Table INDUCTANCE (μH) DCR (mΩ) MAX CURRENT (A) DIMENSIONS (mm) HEIGHT (mm) Würth Electronik WE-PD2 Typ MS Series 0.56 0.82 1.2 1.7 2.2 9.5 14 21 27 36 6.5 5.4 4.8 4 3.6 5.2 × 5.8 2 Vishay IHLP-2020BZ-01 Series 0.47 0.68 1 2.2 8.8 12.4 20 50.1 11.5 10 7 4.2 5.2 × 5.5 2 Toko DE3518C Series 0.56 1.2 1.7 24 30 35 3.3 2.4 2.1 3.5 × 3.7 1.8 Sumida CDRH2D18/HP Series 0.56 0.82 1.1 33 39 43 3.7 2.9 2.5 3.2 × 3.2 2 Cooper SD18 Series 0.47 0.82 1.2 1.5 2.2 20.1 24.7 29.4 34.5 39.8 3.58 3.24 2.97 2.73 2.55 5.5 × 5.5 1.8 Coilcraft LPS4018 Series 0.56 1 2.2 30 40 70 4.8 2.8 2.7 4 × 41.7 TDK VLS252012 Series 0.47 1 1.5 2.2 56 88 126 155 3.3 2.4 2 1.8 2.5 × 21.2 CIN and COUT Selection The input capacitance, CIN,isneededtofilterthetrapezoidal wave current at the drain of the top power MOSFET. To prevent large voltage transients from occurring a low ESR input capacitor sized for the maximum RMS current is recommended. The maximum RMS current is given by: II VV V V RMS OUT MAX OUT IN OUT IN = () () – where IOUT(MAX) equals the maximum average output current. This formula has a maximum at VIN = 2VOUT, where IRMS = IOUT/2. This simple worst-case condition is commonly used for design because even significant deviations do not offer much relief. Note that ripple cur- rent ratings from capacitor manufacturers are often based on only 2000 hours of life which makes it advisable to further de-rate the capacitor or choose a capacitor rated at a higher temperature than required. Several capacitors may be paralleled to meet the require- ments of the design. For low input voltage applications sufficient bulk input capacitance is needed to minimize transient effects during output load changes. Even though the LTC3601 design includes an overvoltage protection circuit, care must always be taken to ensure input volt- age transients do not pose an overvoltage hazard to the part. The selection of COUT is primarily determined by the effec- tive series resistance (ESR) that is required to minimize voltage ripple and load step transients. The output ripple, ΔVOUT, is determined by: VOUT < IL ESR + 1 8• f • COUT The output ripple is highest at maximum input voltage since ΔIL increases with input voltage. Multiple capacitors placed in parallel may be needed to meet the ESR and RMS current handling requirements. Dry tantalum, special polymer, aluminum electrolytic, and ceramic capacitors are all available in surface mount packages. Special polymer capacitors offer low ESR but have lower capacitance density than other types. Tantalum capacitors have the |
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