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LM2574

National Semiconductor
Part Number LM2574
Manufacturer National Semiconductor
Description SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator
Published Mar 22, 2005
Detailed Description LM2574/LM2574HV SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator June 1999 LM2574/LM2574HV SIMPLE SWITCHER™ 0.5A Step-...
Datasheet PDF File LM2574 PDF File

LM2574
LM2574

Overview
LM2574/LM2574HV SIMPLE SWITCHER 0.
5A Step-Down Voltage Regulator June 1999 LM2574/LM2574HV SIMPLE SWITCHER™ 0.
5A Step-Down Voltage Regulator General Description The LM2574 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.
5A load with excellent line and load regulation.
These devices are available in fixed output voltages of 3.
3V, 5V, 12V, 15V, 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 LM2574 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 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 guaranteed ± 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.
Features n 3.
3V, 5V, 12V, 15V, and adjustable output versions n Adjustable version output voltage range, 1.
23V to 37V (57V for HV version) ± 4% max over line and load conditions n Guaranteed 0.
5A output current n Wide input voltage range, 40V, up to 60V for HV version n Requires only 4 external components n 52 kHz fixed frequency internal oscillator n TTL shutdown capability, low power standby mode n High efficiency n Uses readily available standard inductors n Thermal shutdown and current limit protection Applications n n n n Simple high-efficie...


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