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MAX8640YEXT16+T Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX8640YEXT16+T Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page Soft-Start The MAX8640Y/MAX8640Z include internal soft-start circuitry that eliminates inrush current at startup, reduc- ing transients on the input source. Soft-start is particu- larly useful for higher impedance input sources, such as Li+ and alkaline cells. See the Soft-Start Response in the Typical Operating Characteristics. Applications Information The MAX8640Y/MAX8640Z are optimized for use with a tiny inductor and small ceramic capacitors. The correct selection of external components ensures high efficien- cy, low output ripple, and fast transient response. Inductor Selection A 1µH inductor is recommended for use with the MAX8640Z, and 2.2µH is recommended for the MAX8640Y. A 1µH inductor is physically smaller but requires faster switching, resulting in some efficiency loss. Table 1 lists several recommended inductors. It is acceptable to use a 1.5µH inductor with either the MAX8640Y or MAX8640Z, but efficiency and ripple should be verified. Similarly, it is acceptable to use a 3.3µH inductor with the MAX8640Y, but performance should be verified. For optimum voltage positioning of load transients, choose an inductor with DC series resistance in the 75m Ω to 150mΩ range. For higher efficiency at heavy loads (above 200mA) or minimal load regulation (but some transient overshoot), the resistance should be kept as low as possible. For light-load applications up to 200mA, higher resistance is acceptable with very lit- tle impact on performance. Capacitor Selection Output Capacitor The output capacitor, C2, is required to keep the output voltage ripple small and to ensure regulation loop sta- bility. C2 must have low impedance at the switching fre- quency. Ceramic capacitors are recommended due to Tiny 500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters 6 _______________________________________________________________________________________ Table 1. Suggested Inductors MANUFACTURER SERIES INDUCTANCE (µH) DC RESISTANCE ( Ω typ) CURRENT RATING (mA) DIMENSIONS L x W x H (mm) MIPFT2520D 2.0 0.16 900 2.5 x 2.0 x 0.5 1.5 0.07 1500 2.2 0.08 1300 FDK MIPF2520D 3.3 0.10 1200 2.5 x 2.0 x 1.0 1.0 0.12 1200 1.5 0.16 1000 Murata LQM31P 2.2 0.22 900 3.2 x 1.6 x 0.95 1.2 0.08 590 1.5 0.09 520 Sumida CDRH2D09 2.2 0.12 440 3.0 x 3.0 x 1.0 1.0 0.11 1100 1.5 0.13 1000 Taiyo Yuden CKP3216T 2.2 0.14 900 3.2 x 1.6 x 0.9 1.0 0.15 460 GLF201208T 2.2 0.36 300 2.0 x 1.25 x 0.9 1.0 0.07 400 GLF2012T 2.2 0.10 300 2.0 x 1.25 x 1.35 1.0 0.10 800 TDK GLF251812T 2.2 0.20 600 2.5 x 1.8 x 1.35 1.0 0.05 1000 MDT2520-CR 2.2 0.08 700 2.5 x 2.0 x 1.0 1.0 0.07 1100 TOKO D2812C 2.2 0.14 770 2.8 x 2.8 x 1.2 |
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