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MAX757ESA Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX757ESA Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 8 page 3.3V/5V/Adjustable-Output, Step-Up DC-DC Converters _______________________________________________________________________________________ 7 N N MAX756 GND VOUT VIN TRIG Q ONE-SHOT MINIMUM OFF-TIME ONE-SHOT Q F/F S R MAXIMUM ON-TIME ONE-SHOT TRIG Q ONE-SHOT LX OUT REFERENCE REF LBI LBO 3/5 SHDN Figure 2. MAX756 Block Diagram The ESR of both bypass and filter capacitors affects efficiency. Best performance is obtained by using spe- cialized low-ESR capacitors, or connecting two or more filter capacitors in parallel. The smallest low-ESR SMT tantalum capacitors currently available are Sprague 595D series, which are about half the size of competing products. Sanyo OS-CON organic semiconductor through-hole capacitors also exhibit very low ESR, and are especially useful for operation at cold tempera- tures. Table 1 lists suggested capacitor suppliers. Rectifier Diode For optimum performance, a switching Schottky diode, such as the 1N5817, is recommended. 1N5817 equiv- alent diodes are also available in surface-mount pack- ages from Collmer Semiconductor in Dallas, TX, phone (214) 233-1589. The part numbers are SE014 or SE024. For low output power applications, a pn junc- tion switching diode, such as the 1N4148, will also work well, although efficiency will suffer due to the greater forward voltage drop of the pn junction diode. |
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