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| 型号： | LM2576WU |
| 厂商： | Micrel Inc |
| 文件页数： | 1/9页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A TO263-5 |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.23 V ~ 37 V |
| 输入电压： | 4 V ~ 40 V |
| 频率 - 开关： | 42kHz ~ 63kHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-6，D²Pak（5 引线+接片），TO-263BA |
| 包装： | 散装 |
| 供应商设备封装： | TO-263-5 |
LM2576
General Description
The LM2576 series of monolithic integrated circuits provide
all the active functions for a step-down (buck) switching
regulator. Fixed versions are available with a 3.3V, 5V, or 12V
fixed output. Adjustable versions have an output voltage
range from 1.23V to 37V. Both versions are capable of driving
a 3A load with excellent line and load regulation.
These regulators are simple to use because they require a
minimum number of external components and include internal
frequency compensation and a fixed-frequency oscillator.
The LM2576 series offers a high efficiency replacement for
popular three-terminal adjustable linear regulators. It
substantially reduces the size of the heat sink, and in many
cases no heat sink is required.
A standard series of inductors available from several different
manufacturers are ideal for use with the LM2576 series. This
feature greatly simplifies the design of switch-mode power
supplies.
The feedback voltage is guaranteed to ± 2% tolerance for
adjustable versions, and the output voltage is guaranteed to
± 3% for fixed versions, within specified input voltages and
output load conditions. The oscillator frequency is guaranteed
to ± 10%. External shutdown is included, featuring less than
200 μ A standby current. The output switch includes cycle-by-
cycle current limiting and thermal shutdown for full protection
Micrel, Inc.
LM2576
52kHz Simple 3A Buck Regulator
Features
? 3.3V, 5V, 12V, and adjustable output versions
? Voltage over specified line and load conditions:
Fixed version: ± 3% max. output voltage
Adjustable version: ± 2% max. feedback voltage
? Guaranteed 3A output current
? Wide input voltage range:
4V to 40V
? Wide output voltage range
1.23V to 37V
? Requires only 4 external components
? 52kHz fixed frequency internal oscillator
? Low power standby mode I Q typically < 200 μ A
? 80% efficiency (adjustable version typically > 80%)
? Uses readily available standard inductors
? Thermal shutdown and current limit protection
? 100% electrical thermal limit burn-in
Applications
? Simple high-efficiency step-down (buck) regulator
? Efficient pre-regulator for linear regulators
? On-card switching regulators
? Positive to negative converter (inverting Buck-Boost)
under fault conditions.
?
Isolated Flyback Converter using minimum number of
external components
? Negative Boost Converter
Typical Applications
7V – 40V
7V – 40V
1
1
Unregulated
DC Input
+V IN
4 Feedback
LM2575-5.0 Output L1
+5V, 1A
Regulated
Output
Unregulated
DC Input
+V IN
LM2575
4 Feedback
Output L1
+5V, 1A
Regulated
Output
+
C IN
100μF
3 5
Gnd On/Off
2
330μH
D1
1N5822
+
C OUT
330μF
+
C IN
100μF
3 5
Gnd On/Off
2
330μH
D1
1N5822
+
C OUT
330μF
R2 3.09k
R1 1k
Note: Pin numbers are for TO-220 Package
Note: Pin numbers are for TO-220 Package
R1
V OUT = 1.23 ( 1 + R2
)
Fixed Regulator in Typical Application
Adjustable Regulator in Fixed Output Application
Micrel, Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com
August 2005
1
M9999-082605-B
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2576WU TR | 功能描述:直流/直流开关调节器 3A Step-Down SMPS Regulator (ROHS Compliant) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| LM2576WUI05 | 制造商:Micrel 功能描述:Micrel LM2576WUI05 |
| LM2576WUTR | 制造商:Micrel 功能描述:Conv DC-DC Single Step Down 4V to 40V |
| LM2576WU-TR | 功能描述:Buck Switching Regulator IC Positive Adjustable 1.23V 1 Output 3A TO-263-6, D2Pak (5 Leads + Tab), TO-263BA 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压 输出类型:可调式 输出数:1 电压 - 输入（最小值）:4V 电压 - 输入（最大值）:40V 电压 - 输出（最小值/固定）:1.23V 电压 - 输出（最大值）:37V 电流 - 输出:3A 频率 - 开关:52kHz 同步整流器:无 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:TO-263-6，D2Pak（5 引线+接片），TO-263BA 供应商器件封装:TO-263-5 标准包装:1 |
| LM2577 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:SIMPLE SWITCHER? Step-Up Voltage Regulator |
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