The LM2594xx series of regulators are monolithic integrated circuits that provide all theactive functions for a step-down (buck) switching regulator, capable of driving a 0.5-A load withexcellent line and load regulation. These devices are available in fixed output voltages of 3.3 V,5 V, 12 V, and an adjustable output version, and are packaged in a 8-pin PDIP and a 8-pinsurface-mount SOIC package.
Requiring a minimum number of external components, these regulators are simple to use andfeature internal frequency compensation, a fixed-frequency oscillator, and improved line and loadregulation specifications.
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A standard series of inductors (both through-hole and surface-mount types) are availablefrom several different manufacturers optimized for use with the LM2594xx series. This featuregreatly simplifies the design of switch-mode power supplies.
Other features include an ensured ±4% tolerance on output voltage under all conditions ofinput voltage and output load conditions, and ±15% on the oscillator frequency. External shutdownis included, featuring typically 85-µA standby current. Self-protection features include a twostage frequency reducing current limit for the output switch and an overtemperature shutdown forcomplete protection under fault conditions.
The LM2594HV is for applications requiring an input voltage up to 60 V.