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LTC2804CDHC Folha de dados(PDF) 11 Page - Linear Technology |
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LTC2804CDHC Folha de dados(HTML) 11 Page - Linear Technology |
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11 / 18 page  2801234fe LTC2801/LTC2802/ LTC2803/LTC2804 Table 3. Recommended Inductors PART NUMBER ISAT (mA) MAX DCR (Ω) SIZE (mm) MANUFACTURER LQH2MCN100K02L 225 1.2 2 × 1.6 × 0.95 Murata www.murata.com LBC2016T100K 245 0.85 2 × 1.6 × 1.6 Taiyo Yuden www.t-yuden.com FSLB2520-100K 220 1.1 2.5 × 2 × 1.6 Toko www.tokoam.com Capacitor Selection The small size of ceramic capacitors makes them ideal for the LTC2801 family. X5R and X7R (preferred) types are recommendedbecausetheirESRislowandtheyretaintheir capacitance over relatively wide voltage and temperature ranges. Use a voltage rating of at least 10V. Table 4. Recommended Ceramic Capacitor Manufacturers MANUFACTURER URL Murata www.murata.com TDK www.tdk.com Taiyo Yuden www.t-yuden.com AVX www.avxcorp.com Kemet www.kemet.com Inrush Current and Supply Overshoot Precaution In certain applications, such as battery-operated and wall-adapter devices, fast supply slew rates are generated when power is connected. If VCC’s voltage is greater than 4.5V and its rise time is faster than 10µs, the pins VDD and SW can exceed their ABS MAX values during start- up. When supply voltage is applied to VCC, the voltage difference between VCC and VDD generates inrush current VL VL VCC VCC GND GND GND GND GND GND GND GND GND GND C1 C1 C5 C5 C3 C3 TOP VIEW = VIA TOP VIEW = VIA C4 C4 C2 C2 L1 L1 2801 F09 SW CAP VDD GND SCALE R1 WITH C1, C2, 1/C4 C1 220nF L1 10µH 4.5V TO 5.5V VCC R1 1 1/8W C4 1µF C2 1µF INRUSH CURRENT 2801 F08 aPPlicationS inForMation flowing through inductor L1 and capacitors C1, C2. The peak inrush current must not exceed 2A. To avoid this condition, add a 1Ω resistor as shown in Figure 8. This precaution is not relevant for supply voltages below 4.5V or rise times longer than 10µs. Board Layout The board layout should minimize the length and area of the SW and CAP traces. Suggested compact layouts for the LTC2801 family are shown in Figure 9 (a) and (b). Figure 9. Recommended Board Layouts for (a) Single and (b) Dual Transceiver Parts Figure 8. Supply Overshoot Protection for Input Supplies of 4.5V or Higher |
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