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The MIC38C4x are fixed frequency, high performance, current-mode PWM controllers. Micrel’s BiCMOS devices arepin compaTIble with 384x bipolar devices but feature severalimprovements.Undervoltage lockout circuitry allows the ’42 and ’44 versionsto start up at 14.5V and operate down to 9V, and the ’43 and’45 versions start at 8.4V with operaTIon down to 7.6V. Allversions operate up to 20V.When compared to bipolar 384x devices operaTIng from a 15Vsupply, start-up current has been reduced to 50μA typical andoperaTIng current has been reduced to 4.0 mA typical. Decreasedoutput rise and fall times drive larger MOSFETs, andrail-to-rail output capability increases efficiency, especially atlower supply voltages. The MIC38C4x also features a trimmedoscillator discharge current and bandgap reference.The MIC38C4x denotes 8-pin plastic DIP and SOIC packages.MIC384Cx-1 denotes 14-pin plastic DIP and SOIC packages.8-pin devices feature small size, while 14-pin devices separatethe analog and power connections for improved perfomanceand power dissipation.
