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LTC3577 Datasheet(PDF) 26 Page - Linear Technology |
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LTC3577 Datasheet(HTML) 26 Page - Linear Technology |
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26 / 38 page  LTC3675 26 3675fa Table 4. Recommended Inductors for 1A Buck Regulators and Ganged Buck 3, Buck 4 Application PART NUMBER L(μH) MAX IDC (A) MAX DCR (mΩ) SIZE IN mm (L × W × H) MANUFACTURER LPS4018-222 2.2 2.8 70 4 × 4 × 1.8 Coilcraft www.coilcraft.com XFL4022-222 2.2 3.5 21.35 4 × 4 × 2 Coilcraft www.coilcraft.com LTF5022-2R2 2.2 3.2 36 5 × 5.2 × 2.2 TDK www.tdk.com LPS3015-222 2.2 2.0 110 3 × 3 × 1.5 Coilcraft www.coilcraft.com Table 5. Recommended Inductors for 500mA Buck Regulators PART NUMBER L(μH) MAX IDC (A) MAX DCR (mΩ) SIZE IN mm (L × W × H) MANUFACTURER LPS3015-222 2.2 2.0 110 3 × 3 × 1.5 Coilcraft www.coilcraft.com MLPS3015-2R2 2.2 1.4 110 3 × 3 × 1.5 Maglayers www.maglayers.com MDT2520-CR2R2 2.2 1.35 90 2.5 × 2 × 1 Toko www.toko.com LQM2HPN2R2 2.2 1.0 120 2.5 × 2 × 1.1 Murata www.murata.com Switching Regulator Output Voltage and Feedback Network The output voltage of the switching regulators is pro- grammed by a resistor divider connected from the switching regulator’s output to its feedback pin and is given by VOUT = VFB (1 + R2/R1) as shown in Figure 5. Typical values for R1 range from 40kΩ to 1MΩ. The buck regulator transient response may improve with optional capacitor CFF that helps cancel the pole created by the feedback resistors and the input capacitance of the FB pin. Experimentation with capacitor values between 2pF and 22pF may improve transient response. APPLICATIONS INFORMATION SWITCHING REGULATOR (BUCK, BOOST, BUCK-BOOST) VOUT COUT (OPTIONAL) CFF R2 R1 FB 3675 F05 + Figure 5. Feedback Components Buck Regulators All four buck regulators are designed to be used with 2.2μH inductors. Tables 4 and 5 show the recommended inductors for the 500mA and 1A buck regulators. The input supply needs to be decoupled with a 10μF capacitor while the output needs to be decoupled with a 22μF capacitor for a 1A buck regulator and 10μF for a 500mA buck regulator. Refer to Capacitor Selection in the Applications Information section for details on selecting a proper capacitor. EachbuckregulatorcanbeprogrammedviaI2C.Toprogram buck regulator 1 (1A) use sub-address 01h, buck regulator 2 (1A) sub-address 02h, buck regulator 3 (500mA) sub- address 03h and buck regulator4 (500mA) sub-address 04h. The bit format is explained in Table 6. Combined Buck Regulators A single 2A buck regulator is available by combining both 1A buck regulators together. Both the 500mA buck regula- tors may also be combined together to form a 1A buck regulator. Tables 4 and 7 show the recommended inductors. The input supply needs to be decoupled with a 22μF capacitor while the output needs to be decoupled with |
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