Adjustable With a Range of 1.23 V to 37 V and ±4% Regulation (Max) Over Line, Load, and Temperature Conditions Specified 1-A Output Current Wide Input Voltage Range. . .4.75 V to 40 V Uses Readily Available Standard Inductors 52-kHz (Typ) Fixed-Frequency Internal Oscillator TTL Shutdown Capability With 50-µA (Typ) Standby Current High Efficiency. . .as High as 88% (Typ) Thermal Shutdown and Current-Limit Protection With Cycle-by-Cycle Current Limiting For the Full Offering of Voltages (Including Fixed-Output Options) and Packages (Including TO-263), see TL2575 Datasheet APPLICATIONS Simple High-Efficiency Step-Down (Buck) Regulator Pre-Regulator for Linear Regulators On-Card Switching Regulators Positive-to-Negative Converter (Buck-Boost) DESCRIPTION/ORDERING INFORMATION The LM2575 greatly simplifies the design of switching power supplies by conveniently providing all the active functions needed for a step-down (buck) switching regulator in an integrated circuit. Accepting a wide input voltage range and available in an adjustable output version, the LM2575 has an integrated switch capable of delivering 1 A of load current, with excellent line and load regulation. The device also offers internal frequency compensation, a fixed-frequency oscillator, cycle-by-cycle current limiting, and thermal shutdown. In addition, a manual shutdown is available via an external ON