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LM2574

Micrel Semiconductor
Part Number LM2574
Manufacturer Micrel Semiconductor
Description 52kHz Simple 0.5A Buck Regulator
Published Mar 22, 2005
Detailed Description LM2574 Micrel, Inc. LM2574 52kHz Simple 0.5A Buck Regulator General Description The LM2574 family is a series of easy ...
Datasheet PDF File LM2574 PDF File

LM2574
LM2574

Overview
LM2574 Micrel, Inc.
LM2574 52kHz Simple 0.
5A Buck Regulator General Description The LM2574 family is a series of easy to use fixed and adjustable switching voltage regulators.
The LM2574 contains all of the active circuitry necessary to construct a stepdown (buck) switching regulator and requires a minimum of external components.
The LM2574 is available in 3.
3V and 5V fixed output versions, or an adjustable version with an output voltage range of 1.
23V to 37V.
Output voltage is guaranteed to ±4% for specified input and load conditions.
The LM2574 can supply 0.
5A while maintaining excellent line and load regulation.
The output switch includes cycleby-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.
An external shutdown connection selects operating or standby modes.
Standby current is less than 200µA.
Heat sinks are generally unnecessary due the regulator’s high efficiency.
Adequate heat transfer is usually provided by soldering all package pins to a printed circuit board.
The LM2574 includes internal frequency compensation and an internal 52kHz fixed frequency oscillator guaranteed to ±10% of the frequency.
Circuits constructed around the LM2574 use a standard series of inductors which are available from several different manufacturers.
All support documentation can be found on Micrel’s web site at www.
micrel.
com.
Features • 3.
3V, 5V, 12V, and adjustable output versions • Adjustable version output 1.
23V to 37V ±4% max.
over line and load conditions.
• Guaranteed 0.
5A output current • Wide input voltage, up to 40V • Thermal shutdown and current limit protection • Requires only 4 external components.
• Shutdown capability (standby mode) • Low power standby mode < 200µA Typical • High-efficiency • 52kHz fixed frequency internal oscillator • Uses standard inductors Applications • Simple high-efficiency step-down (buck) regulator • Efficient pre-regulator for linear regulators • On-card switching regulators • Positive to negative c...


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