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MAX1947ETAXY Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX1947ETAXY Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 10 page Shutdown The MAX1947 enters shutdown mode when SHDN is driven low. During shutdown, the synchronous rectifier disconnects the output from the input, eliminating the DC conduction path that normally exists with traditional boost converters in shutdown mode. The output is actively dis- charged to ground through an internal 500Ω resistor. The quiescent current is reduced to 2µA while in shutdown mode. Drive SHDN high for normal operation. The output reaches regulation approximately 650µs after SHDN goes high. Applications Information Inductor Selection An inductor value of 4.7µH performs well in most appli- cations. The MAX1947 also works with inductors in the 2.2µH to 6.8µH range. Smaller inductance values typi- cally offer a smaller physical size for a given series resistance, allowing the smallest overall circuit dimen- sions but with lower output-current capability. Circuits using larger inductance values exhibit higher output- current capability, but are larger for the same series resistance and current rating. The inductor’s incremental saturation current rating should be greater than the peak switch-current limit. However, it is generally acceptable to bias the inductor into saturation by as much as 20%, although this slightly reduces efficiency (see the Electrical Characteristics for the MAX1947 NFET current limit). Table 1 lists the suggested components for several typ- ical applications. Also, the inductor’s DC resistance sig- nificantly affects efficiency. Low Input/Output Voltage Step-Up DC-DC Converter with RESET 8 _______________________________________________________________________________________ APPLICATION LOAD INPUT CAPACITOR (µF) OUTPUT CAPACITOR (µF) INDUCTOR (µH) ≤50% full load 2.2 4.7 3.3 1-Cell Input, Output < 2.7V >50% full load 2.2 10 3.3 ≤50% full load 2.2 4.7 4.7 1-Cell Input, Output > 2.7V >50% full load 2.2 10 4.7 ≤50% full load 2.2 4.7 6.8 2-Cell Input >50% full load 2.2 10 6.8 Table 1. Suggested Component Values MANUFACTURER PART PART NUMBER PHONE WEBSITE Sumida Inductor CDRH3D16 series 81-3-3667-3381 www.sumida.com Output capacitors 4.7µF JMK212BJ475MG, 10µF JMK212BJ106MG Taiyo Yuden Input capacitors 2.2µF LMK107BJ225MA 408-573-4150 www.t-yuden.com Output capacitors 4.7µF C2012X5R0J475K, 10µF C2012X5R0J106K TDK Input capacitors 2.2µF C1608X5R03225M 888-835-6646 www.TDK.com Table 2. Suggested Component Manufacturers |
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