Datasheet Microchip LM2574-12YN — Ficha de datos

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
components.
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
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 200ВµA.
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 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
manufacturers.
All support documentation can be found on Micrel’s web site …