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LM2574YN PDF预览

LM2574YN

更新时间: 2024-11-06 11:34:03
品牌 Logo 应用领域
麦瑞 - MICREL 稳压器
页数 文件大小 规格书
8页 190K
描述
52kHz Simple 0.5A Buck Regulator

LM2574YN 数据手册

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LM2574  
52kHz Simple 0.5A Buck Regulator  
General Description  
Features  
The LM2574 family is a series of easy to use fixed and ad-  
justable switching voltage regulators. The LM2574 contains  
all of the active circuitry necessary to construct a stepdown  
(buck)switchingregulatorandrequiresaminimumofexternal  
components.  
• 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  
The LM2574 is available in 3.3V and 5V fixed output ver-  
sions, 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 cycle-  
by-cycle current limiting, as well as thermal shutdown for full  
protection under fault conditions.  
• 52kHz fixed frequency internal oscillator  
• Uses standard inductors  
Applications  
Anexternalshutdownconnectionselectsoperatingorstandby  
modes. Standby current is less than 200µA.  
• Simple high-efficiency step-down (buck) regulator  
• Efficient pre-regulator for linear regulators  
• On-card switching regulators  
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.  
• Positive to negative converter (buck-boost)  
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.  
Typical Application  
40V MAX  
UNREGULATED  
DC IN  
FB  
VIN  
REGULATED  
OUTPUT  
C
22µF  
330µH  
0.5A  
IN  
LM2574  
OUT  
PWR SIG ON/  
GND GND OFF  
COUT  
11DQ05  
220µF  
Figure 1. Fixed Output Regulator Circuit  
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com  
July 2005  
1
M9999-072805  

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The LM2575 series of monolithic integrated circuits provide all the active functions for