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LM2574N-5.0

更新时间： 2024-11-10 02:58:35
品牌 Logo 应用领域
德州仪器 - TI 开关光电二极管
页数 文件大小 规格书
35页 2714K
描述
LM2574/LM2574HV SIMPLE SWITCHER™ 0.5A Step-Down Voltage Regulator

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LM2574N-5.0 数据手册

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LM2574, LM2574HV  
www.ti.com  
SNVS104C –JUNE 1999–REVISED APRIL 2013  
LM2574/LM2574HV SIMPLE SWITCHER™ 0.5A Step-Down Voltage Regulator  
Check for Samples: LM2574, LM2574HV  
1
FEATURES  
DESCRIPTION  
The LM2574 series of regulators are monolithic  
23  
•
3.3V, 5V, 12V, 15V, and Adjustable Output  
Versions  
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.  
•
Adjustable Version Output Voltage Range,  
1.23V to 37V (57V for HV version) ±4% Max  
Over Line and Load Conditions  
•
•
Specified 0.5A Output Current  
Wide Input Voltage Range, 40V, up to 60V for  
HV Version  
Requiring  
a
minimum number of external  
components, these regulators are simple to use and  
include internal frequency compensation and a fixed-  
frequency oscillator.  
•
•
•
Requires Only 4 External Components  
52 kHz Fixed Frequency Internal Oscillator  
The LM2574 series offers  
a
high-efficiency  
TTL Shutdown Capability, Low Power Standby  
Mode  
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.  
•
•
•
High Efficiency  
Uses Readily Available Standard Inductors  
Thermal Shutdown and Current Limit  
Protection  
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.  
APPLICATIONS  
Other features include a specified ±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.  
•
Simple High-Efficiency Step-Down (Buck)  
Regulator  
•
•
•
Efficient Pre-Regulator for Linear Regulators  
On-Card Switching Regulators  
Positive to Negative Converter (Buck-Boost)  
Typical Application (Fixed Output Voltage Versions)  
Note: Pin numbers are for 8-pin PDIP package.  
Figure 1.  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
SIMPLE SWITCHER is a trademark of Texas Instruments.  
2
3
All other trademarks are the property of their respective owners.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 1999–2013, Texas Instruments Incorporated  
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LM2574N-5.0 替代型号

型号 品牌 替代类型 描述 数据表
LM2574N-5.0/NOPB TI

完全替代

 具有 4 个外部组件的 8V 至 40V、500mA SIMPLE SWITCHER® 降
LM2594N-5.0/NOPB TI

类似代替

 LM2594/LM2594HV SIMPLE SWITCHER® Power Conve
LM2594HVN-5.0/NOPB TI

类似代替

 LM2594/LM2594HV SIMPLE SWITCHER® Power Conve

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