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NCV2574

更新时间： 2024-11-23 04:13:39
品牌 Logo 应用领域
安森美 - ONSEMI 稳压器开关
页数 文件大小 规格书
26页 296K
描述
0.5 A, Adjustable Output Voltage, Step−Down Switching Regulator

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NCV2574 数据手册

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LM2574, NCV2574  
0.5 A, Adjustable Output  
Voltage, Step−Down  
Switching Regulator  
The LM2574 series of regulators are monolithic integrated circuits  
ideally suited for easy and convenient design of a step−down  
switching regulator (buck converter). All circuits of this series are  
capable of driving a 0.5 A load with excellent line and load regulation.  
These devices are available in fixed output voltages of 3.3 V, 5.0 V,  
12 V, 15 V, and an adjustable output version.  
These regulators were designed to minimize the number of external  
components to simplify the power supply design. Standard series of  
inductors optimized for use with the LM2574 are offered by several  
different inductor manufacturers.  
http://onsemi.com  
SO−16 WB  
DW SUFFIX  
CASE 751G  
16  
1
Since the LM2574 converter is a switch−mode power supply, its  
efficiency is significantly higher in comparison with popular  
three−terminal linear regulators, especially with higher input voltages.  
In most cases, the power dissipated by the LM2574 regulator is so low,  
that the copper traces on the printed circuit board are normally the only  
heatsink needed and no additional heatsinking is required.  
PDIP−8  
N SUFFIX  
CASE 626  
8
1
The LM2574 features include a guaranteed 4% tolerance on output  
voltage within specified input voltages and output load conditions, and  
10% on the oscillator frequency ( 2% over 0°C to +125°C). External  
shutdown is included, featuring 60 mA (typical) standby current. The  
output switch includes cycle−by−cycle current limiting, as well as  
thermal shutdown for full protection under fault conditions.  
PIN CONNECTIONS  
*
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
*
*
*
FB  
Output  
*
Features  
Sig Gnd  
• 3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions  
• Adjustable Version Output Voltage Range, 1.23 to 37 V 4% max  
over Line and Load Conditions  
• Guaranteed 0.5 A Output Current  
• Wide Input Voltage Range: 4.75 to 40 V  
• Requires Only 4 External Components  
• 52 kHz Fixed Frequency Internal Oscillator  
• TTL Shutdown Capability, Low Power Standby Mode  
• High Efficiency  
• Uses Readily Available Standard Inductors  
• Thermal Shutdown and Current Limit Protection  
• NCV Prefix for Automotive and Other Applications Requiring Site  
and Control Changes  
V
ON/OFF  
in  
Pwr Gnd  
*
*
*
*
*
(Top View)  
1
2
3
4
8
7
6
5
*
FB  
Sig Gnd  
ON/OFF  
Output  
*
V
Pwr Gnd  
in  
(Top View)  
* No internal connection, but should be soldered to  
* PC board for best heat transfer.  
• Pb−Free Packages are Available*  
Applications  
ORDERING INFORMATION  
• Simple and High−Efficiency Step−Down (Buck) Regulators  
• Efficient Pre−regulator for Linear Regulators  
• On−Card Switching Regulators  
See detailed ordering and shipping information in the package  
dimensions section on page 24 of this data sheet.  
DEVICE MARKING INFORMATION  
See general marking information in the device marking  
section on page 24 of this data sheet.  
• Positive to Negative Converters (Buck−Boost)  
• Negative Step−Up Converters  
• Power Supply for Battery Chargers  
*For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting  
Techniques Reference Manual, SOLDERRM/D.  
© Semiconductor Components Industries, LLC, 2006  
1
Publication Order Number:  
August, 2006 − Rev. 8  
LM2574/D  
1234567...26

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