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LTC3565 Datasheet(PDF) 11 Page - Linear Technology |
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LTC3565 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 22 page  LTC3565 11 3565fc For more information www.linear.com/LTC3565 APPLICATIONS INFORMATION shows some typical surface mount inductors that work well in LTC3565 applications. Table 1. Representative Surface Mount Inductors MANU- FACTURER PARTNUMBER VALUE MAXDC CURRENT DCR HEIGHT Toko A914BYW-1R2M=P3: D52LC 1.2µH 2.15A 44mΩ 2mm A960AW-1R2M=P3: D518LC 1.2µH 1.8A 46mΩ 1.8mm DB3015C-1068AS-1R0N 1.0µH 2.1A 43mΩ 1.5mm DB3018C-1069AS-1R0N 1.0µH 2.1A 45mΩ 1.8mm DB3020C-1070AS-1R0N 1.0µH 2.1A 47mΩ 2mm A914BYW-2R2M-D52LC 2.2µH 2.05A 49mΩ 2mm A915AY-2ROM-D53LC 2.0µH 3.3A 22mΩ 3mm Coilcraft LPO1704-122ML 1.2µH 2.1A 80mΩ 1mm D01608C-222 2.2µH 2.3A 70mΩ 3mm LP01704-222M 2.2µH 2.4A 120mΩ 1mm Sumida CR32-1R0 1.0µH 2.1A 72mΩ 3mm CR5D11-1R0 1.0µH 2.2A 40mΩ 1.2mm CDRH3D14-1R2 1.2µH 2.2A 36mΩ 1.5mm CDRH4D18C/LD-1R1 1.1µH 2.1A 24mΩ 2mm CDRH4D28C/LD-1R0 1.0µH 3.0A 17.5mΩ 3mm CDRH4D28C-1R1 1.1µH 3.8A 22mΩ 3mm CDRH4D28-1R2 1.2µH 2.56A 23.6mΩ 3mm CDRH6D12-1R0 1.0µH 2.80A 37.5mΩ 1.5mm CDRH4D282R2 2.2µH 2.04A 23mΩ 3mm CDC5D232R2 2.2µH 2.16A 30mΩ 2.5mm Taiyo Yuden NPO3SB1ROM 1.0µH 2.6A 27mΩ 1.8mm N06DB2R2M 2.2µH 3.2A 29mΩ 3.2mm N05DB2R2M 2.2µH 2.9A 32mΩ 2.8mm Murata LQN6C2R2M04 2.2µH 3.2A 24mΩ 5mm FDK MIPW3226DORGM 0.9µH 1.4A 80mΩ 1mm Catch Diode Selection Although unnecessary in most applications, a small improvement in efficiency can be obtained in a few ap- plications by including the optional diode D1 shown in Figure 2, which conducts when the synchronous switch is off. When using Burst Mode operation or pulse skip mode, the synchronous switch is turned off at a low current and the remaining current will be carried by the optional diode. It is important to adequately specify the diode peak current and average power dissipation so as not to exceed the diode ratings. The main problem with Schottkydiodesisthattheirparasiticcapacitancereduces the efficiency, usually negating the possible benefits for LTC3565 circuits. Another problem that a Schottky diode can introduce is higher leakage current at high tempera- tures, which could reduce the low current efficiency. Remember to keep lead lengths short and observe proper grounding(seeBoardLayoutConsiderations)toavoidring- ing and increased dissipation when using a catch diode. Input Capacitor (CIN) Selection In continuous mode, the input current of the converter is a square wave with a duty cycle of approximately VOUT/VIN. To prevent large voltage transients, a low equivalent series resistance (ESR) input capacitor sized for the maximum RMS current must be used. The maximum RMS capacitor current is given by: IRMS ≈ IMAX VOUT(VIN − VOUT) VIN where the maximum average output current IMAX equals the peak current minus half the peak-to-peak ripple cur- rent, IMAX ≅ ILIM – ΔIL/2. This formula has a maximum at VIN = 2VOUT, where IRMS = IOUT/2. This simple worst case is commonly used to design because even significant deviations do not offer much relief. Note that capacitor manufacturer’s ripple cur- rent ratings are often based on only 2000 hours lifetime. This makes it advisable to further derate the capacitor, or choose a capacitor rated at a higher temperature than required.Severalcapacitorsmayalsobeparalleledtomeet thesizeorheightrequirementsofthedesign.Anadditional 0.1µF to 1µF ceramic capacitor is also recommended on VIN for high frequency decoupling, when not using an all ceramic capacitor solution. Output Capacitor (COUT) Selection The selection of COUT is driven by the required ESR to minimize voltage ripple and load step transients. Typically, once the ESR requirement is satisfied, the capacitance |
Similar Part No. - LTC3565_15 |
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Similar Description - LTC3565_15 |
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