Datasheet Microchip LM2574-3.3YN
The LM2574 family is a series of easy to use fixed and adjustable switching voltage regulators
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LM2574 - 52 kHz Simple 0.5A Buck Regulator
LM2574 Micrel, Inc. LM2574
52kHz Simple 0.5A Buck Regulator General Description Features The LM2574 family is a series of easy to use п¬Ѓxed 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
The LM2574 is available in 3.3V and 5V п¬Ѓxed output versions, or an adjustable version with an output voltage range
of 1.23V to 37V. Output voltage is guaranteed to В±4% for
speciп¬Ѓed 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 200ВµA.
Heat sinks are generally unnecessary due the regulatorвЂ™s
high efп¬Ѓciency. 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 п¬Ѓxed frequency oscillator guaranteed to
В±10% of the frequency.
Circuits constructed around the LM2574 use a standard
series of inductors which are available from several different
All support documentation can be found on MicrelвЂ™s web site ...
|Lifecycle Status||Production (Appropriate for new designs but newer alternatives may exist)|
|# of Outputs||1|
|Duty Cycle Max||0.98 %|
|Input Voltage Range||4 - 40 V|
|Light Load Efficiency Mode||No|
|Operating Temperature Range||-40 to +85 °C|
|Output Current||500 mA) Max|
|Output Voltage Range||1.23 V|
|Quiescent Current||5 mA) type|
|Regulator Type||Step Down (Buck)|
|SHUTDOWN Current||50 µA|
|Switching Frequency||52 kHz|
- Power Management > Switching Regulators > Step Down up to 75V
LM25743.3YN, LM2574 3.3YN