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| EUP3484A ds3484a ver1.5 may 2012 1 3a, 30v, 340khz synchronous step-down converter description the EUP3484A is a synchronous current mode buck regulator capable of driving 3a continuous load cur rent with excellent line and load regulation. the eup348 4a can operate with an input range 4.5v to 30v and the output can be externally set from 0.925v to 20v wit h a resistor divider. fault condition protection includes cycle-by-cycle current limiting and thermal shutdown. in shutdown mode the regulator draws 1 a of supply current. programmable soft-start minimizes the inrush supply current and the output overshoot at initial startup . automatic pulse skipping mode operation increase efficiency at light loads. the EUP3484A require a minimum number of external components. typical application circuit features 3a output current automatic pulse skipping mode at light load 35v input surge protection integrated 160m /110m dmos switches 4.5v to 30v input operating range output adjustable from 0.925v to 20v up to 95% efficiency 1 a shutdown current fixed 340khz frequency programmable soft-start thermal shutdown and overcurrent protection input supply overvoltage and undervoltage lockout 230ns minimum on time available in sop-8 (ep) package rohs compliant and 100% lead(pb)-free halogen-free applications distributed power systems networking systems pc monitors portable electronics figure 1. 12v to 3.3v/5v application circuit
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