The LM2594xx series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5-A load with excellent 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-pin surface-mount SOIC package.
●Requiring a minimum number of external components, these regulators are simple to use and feature internal frequency compensation, a fixed-frequency oscillator, and improved line and load regulation specifications.
●The LM2594xx series operates at a switching frequency of 150-kHz, thus allowing smaller-sized filter components than what would be needed with lower-frequency switching regulators. Because of its high efficiency, the copper traces on the printed-circuit board are normally the only heat sinking needed.
●A standard series of inductors (both through-hole and surface-mount types) are available from several different manufacturers optimized for use with the LM2594xx series. This feature greatly simplifies the design of switch-mode power supplies.
●Other features include an ensured ±4% tolerance on output voltage under all conditions of input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 85-µA standby current. Self-protection features include a two stage frequency reducing current limit for the output switch and an overtemperature shutdown for complete protection under fault conditions.
●The LM2594HV is for applications requiring an input voltage up to 60 V.
● 3.3-V, 5-V, 12-V, and Adjustable Output Versions
● Adjustable Version Output Voltage Range: 1.2 V
●to 37 V (57 V for the HV Version), ±4% Maximum
●Over Line and Load Conditions
● Available in 8-Pin Surface-Mount SOIC and 8-Pin
●PDIP Packages
● Ensured 0.5-A Output Current
● Input Voltage Range up to 60 V
● Requires Only 4 External Components
● 150-kHz Fixed-Frequency Internal Oscillator
● TTL Shutdown Capability
● Low Power Standby Mode, IQ Typically 85 µA
● High Efficiency
● Uses Readily-Available Standard Inductors
● Thermal Shutdown and Current-Limit Protection
