Part # LM2574HV datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM2574 LM2574HV SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator

Part Details:

LM2574/LM2574HV June 1999 LM2574/LM2574HVSIMPLE SWITCHERTM 0.5A Step-Down Voltage Regulator General Description Features The LM2574 series of regulators are monolithic integrated n 3.3V, 5V, 12V, 15V, and adjustable output versions SIMPLE circuits that provide all the active functions for a step-down n Adjustable version output voltage range, 1.23V to 37V (buck) switching regulator, capable of driving a 0.5A load (57V for HV version) ±4% max over line and load with excellent line and load regulation. These devices are conditions available in fixed output voltages of 3.3V, 5V, 12V, 15V, and n Guaranteed 0.5A output current an adjustable output version. n Wide input voltage range, 40V, up to 60V for HV version Requiring a minimum number of external components, these n Requires only 4 external components SWITCHER regulators are simple to use and include internal frequency n 52 kHz fixed frequency internal oscillator compensation and a fixed-frequency oscillator. n TTL shutdown capability, low power standby mode The LM2574 series offers a high-efficiency replacement for n High efficiency popular three-terminal linear regulators. Because of its high n Uses readily available standard inductors efficiency, the copper traces on the printed circuit board are n Thermal shutdown and current limit protection normally the only heat sinking needed. A standard series of inductors optimized for use with the Applications LM2574 are available from several different manufacturers. 0.5A This feature greatly simplifies the design of switch-mode n Simple high-efficiency step-down (buck) regulator power supplies. n Efficient pre-regulator for linear regulators Other features include a guaranteed ±4% tolerance on out- n On-card switching regulators Step-Down put voltage within specified input voltages and output load n Positive to negative converter (Buck-Boost) conditions, and ±10% on the oscillator frequency. Externalshutdown is included, featuring 50 µA (typical) standby cur-rent. The output switch includes cycle-by-cycle current limit-ing, as well as thermal shutdown for full protection underfault conditions. Typical Application (Fixed Output Voltage Versions) Voltage Regulator DS011394-1 Note: Pin numbers are for 8-pin DIP package. Patent PendingSIMPLE SWITCHERTM is a trademark of National Semiconductor Corporation © 1999 National Semiconductor Corporation DS011394

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LM2574HV.pdf Datasheet