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LQH4C100K04 Datasheet(PDF) 7 Page - Monolithic Power Systems |
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LQH4C100K04 Datasheet(HTML) 7 Page - Monolithic Power Systems |
7 / 8 page MP2109 – DUAL 1.2MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER MP2109 Rev.1.3 www.MonolithicPower.com 7 2/21/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 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 LP03310-222ML 2.2 0.15 1.1 3.3 x 3.3 x 1 Toko 1002AS 2.2 0.11 1.14 4.6 x 4.6 x 1.2 Sumida CDRH3D16 2.2 0.072 1.20 4 x 4 x 1.8 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 Thermal Dissipation Power dissipation shall be considered when both channels of the MP2109 provide maximum 800mA output current to the loads at high ambient temperature with low input supply voltage. If the junction temperature rises above 150 °C, the MP2109 two channels will be shut down. The junction-to-ambient thermal resistance of the 10-pin QFN (3mm x 3mm) RΘJA is 50°C/W. The maximum power dissipation is about 1.6W when the MP2109 is operating in a 70 °C ambient temperature environment. W 6 . 1 W / C 50 C 70 C 150 PD o o o MAX = − = PC Board Layout The high current paths (GND1/GND2, IN1/IN2 and SW1/SW2) should be placed very close to the device with short, direct and wide traces. Input capacitors should be placed as close as possible to the respective IN and GND pins. The external feedback resistors shall be placed next to the FB pins. Keep the switching nodes SW1/SW2 short and away from the feedback network. |
Similar Part No. - LQH4C100K04 |
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Similar Description - LQH4C100K04 |
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