The LM2574xx 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, 15 V, and an adjustable output version.
●Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed-frequency oscillator.
●The LM2574xx series offers a high-efficiency replacement for popular three-terminal linear regulators. Because of its high efficiency, the copper traces on the printed-circuit board (PCB) are normally the only heat sinking needed.
●A standard series of inductors optimized for use with the LM2574 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies.
●Other features include a specified ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50-µA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.
● 3.3-V, 5-V, 12-V, 15-V, and Adjustable Output
●Versions
● Adjustable Version Output Voltage Range: 1.23 V
●to 37 V (57 V for HV version) ±4% Maximum Over
●Line and Load Conditions
● Specified 0.5-A Output Current
● Wide Input Voltage Range: 40 V, up to 60 V for
●HV Version
● Requires Only 4 External Components
● 52-kHz Fixed-Frequency Internal Oscillator
● TTL Shutdown Capability, Low-Power Standby
●Mode
● High Efficiency
● Uses Readily Available Standard Inductors
● Thermal Shutdown and Current-Limit Protection
