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LM2591HV SIMPLE SWITCHER®Power Converter 150 kHz 1AStep-Down Voltage RegulatorGeneral DescripTIonThe LM2591HV series of regulators are monolithic integratedcircuits that provide all the acTIve funcTIons for astep-down (buck) switching regulator, capable of driving a1A load with excellent line and load regulaTIon. These devicesare available in fixed output voltages of 3.3V, 5V, andan adjustable output version.This series of switching regulators is similar to theLM2590HV, but without some of the supervisory and performancefeatures of the latter.Requiring a minimum number of external components, theseregulators are simple to use and include internal frequencycompensation†, improved line and load specifications and afixed-frequency oscillator.The LM2591HV operates at a switching frequency of 150kHz thus allowing smaller sized filter components than whatwould be needed with lower frequency switching regulators.Available in a standard 5-lead TO-220 package with severaldifferent lead bend options, and a 5-lead TO-263 Surfacemount package.Other features include a guaranteed ±4% tolerance on outputvoltage under all conditions of input voltage and outputload conditions, and ±15% on the oscillator frequency. Externalshutdown is included, featuring typically 90 μAstandby current. Self protection features include a two stagecurrent limit for the output switch and an over temperatureshutdown for complete protection under fault conditions.
