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MP2105 Datasheet(PDF) 7 Page - Monolithic Power Systems |
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MP2105 Datasheet(HTML) 7 Page - Monolithic Power Systems |
7 / 8 page MP2105 – 1MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER MP2105 Rev. 1.2 www.MonolithicPower.com 7 8/19/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. TM Table 2—Suggested Surface Mount Inductors Manufacturer Part Number Inductance (µH) Max DCR (Ω) Saturation Current (A) Dimensions LxWxH (mm 3) Coilcraft D01605T-472 4.7 0.150 1.20 5.4x4.2x1.8 Toko D52LC 4.7 0.087 1.14 5x5x2 Sumida CR43-4R7 4.7 0.109 1.15 4.3x4.8x3.5 Table 3—Inductors for Improved Efficiency at 25mA, 50mA, under 100mA Load. Manufacturer Part Number Inductance (µH) Max DCR (Ω) Saturation Current (A) IRMS (A) Coilcraft DO1605T-103MX 10 0.3 1.0 0.9 Murata LQH4C100K04 10 0.2 1.2 0.8 Sumida CR32-100 10 0.2 1.0 0.7 Sumida CR54-100 10 0.1 1.2 1.4 Input Capacitor Selection The input capacitor reduces the surge current drawn from the input and switching noise from the device. The input capacitor impedance at the switching frequency shall be less than input source impedance to prevent high frequency switching current passing to the input. Ceramic capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR and small temperature coefficients. For most applications, a 4.7µF capacitor is sufficient. Output Capacitor Selection The output capacitor keeps output voltage ripple small and ensures regulation loop stable. The output capacitor impedance shall be low at the switching frequency. Ceramic capacitors with X5R or X7R dielectrics are recommended. The output ripple ∆VOUT is approximately: () ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ × × + × × × − × ≤ ∆ 3 C f 8 1 ESR L f V V V V V OSC OSC IN OUT IN OUT OUT PC Board Layout The high current paths (GND, IN and SW) should be placed very close to the device with short, direct and wide traces. Input capacitor C1 needs to be as close as possible to the IN and GND pins. The external feedback resistors shall be placed next to the FB pin. Keep the switching node SW short and away from the feedback network. Figure 2 illustrates an example of PCB layout and signal routing. Figure 2—MP2105 Suggested Layout |
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