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LM2576-3.3 PDF预览

LM2576-3.3

更新时间： 2024-11-15 04:59:39
品牌 Logo 应用领域
摩托罗拉 - MOTOROLA 稳压器
页数 文件大小 规格书
28页 288K
描述
Easy Switcher 3.0A Step-Down Voltage Regulator

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LM2576-3.3 数据手册

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Order this document by LM2576/D  
EASY SWITCHER  
3.0 A STEP–DOWN  
VOLTAGE REGULATOR  
The LM2576 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 3.0 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 LM2576 are offered by several different  
inductor manufacturers.  
SEMICONDUCTOR  
TECHNICAL DATA  
Since the LM2576 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 many cases, the power  
dissipated is so low that no heatsink is required or its size could be reduced  
dramatically.  
A standard series of inductors optimized for use with the LM2576 are  
available from several different manufacturers. This feature greatly simplifies  
the design of switch–mode power supplies.  
The LM2576 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 80 µA (typical) standby current. The output switch  
includes cycle–by–cycle current limiting, as well as thermal shutdown for full  
protection under fault conditions.  
T SUFFIX  
PLASTIC PACKAGE  
CASE 314D  
1
Pin 1. V  
in  
2. Output  
5
3. Ground  
4. Feedback  
5. ON/OFF  
TV SUFFIX  
PLASTIC PACKAGE  
CASE 314B  
1
Features  
5
• 3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions  
Heatsink surface  
connected to Pin 3.  
• Adjustable Version Output Voltage Range, 1.23 to 37 V ±4% Maximum  
Over Line and Load Conditions  
• Guaranteed 3.0 A Output Current  
• Wide Input Voltage Range  
D2T SUFFIX  
PLASTIC PACKAGE  
CASE 936A  
• 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  
1
2
(D PAK)  
5
Heatsink surface (shown as terminal 6 in case outline  
drawing) is connected to Pin 3.  
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE  
Applications  
LM2576–3.3  
LM2576–5  
LM2576–12  
LM2576–15  
LM2576–ADJ  
3.3 V  
5.0 V  
12 V  
• Simple High–Efficiency Step–Down (Buck) Regulator  
• Efficient Pre–Regulator for Linear Regulators  
• On–Card Switching Regulators  
• Positive to Negative Converter (Buck–Boost)  
• Negative Step–Up Converters  
15 V  
1.23 V to 37 V  
ORDERING INFORMATION  
• Power Supply for Battery Chargers  
Operating  
Temperature Range  
Device  
Package  
LM2576T–XX  
Straight Lead  
Vertical Mount  
Surface Mount  
LM2576TV–XX T = –40° to +125°C  
J
LM2576D2T–XX  
XX = Voltage Option, i.e. 3.3, 5, 12, 15 V; and ADJ for  
Adjustable Output.  
Motorola, Inc. 1999  
Rev 1, 07/1999  
1234567...28

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