Texas Instrument Step-Down Adjustable Voltage Regulator IC 1.2v to 37v 500mA 8-Dip Package of 12 pieces Type Step-Down (Buck) Output Type Adjustable Number of Outputs 1 Voltage - Output 1.2 V ~ 37 V Voltage - Input 4.5 V ~ 40 V PWM Type - Frequency - Switching 150kHz Current - Output 500mA Synchronous Rectifier No Operating Temperature -40C ~ 125C Mounting Type Through Hole Package / Case 8-DIP (0.300", 7.62mm) Description: The LM2597 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.50A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3v, 5v, 12v and an adjustable output version, and are packaged in an 8-lead dip and an 8-lead surface mount package. This series of switching regulators is similar to the LM2594 series, with additional supervisory and performance features added. Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation, improved line and load specifications, fixed-frequency oscillator, Shutdown/Soft-start, error flag delay and error flag output. The LM2597 series operates at a switching frequency of 150 kHz thus allowing smaller size filter components than what would be needed with a 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 LM2597 series. This feature greatly simplifies the design of the switch-mode power supplies. Other features include a guaranteed +/- 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 uA standby current. Self protection features include a two stage current limit for the output switch and an over temperature shutdown for complete protection under fault conditions.