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LM2574-3.3MDC PDF预览

LM2574-3.3MDC

更新时间: 2024-10-27 13:09:19
品牌 Logo 应用领域
美国国家半导体 - NSC 稳压器
页数 文件大小 规格书
24页 642K
描述
IC 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC, DIE, Switching Regulator or Controller

LM2574-3.3MDC 技术参数

生命周期:Transferred包装说明:DIE, DIE OR CHIP
Reach Compliance Code:unknownECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:5.55
模拟集成电路 - 其他类型:SWITCHING REGULATOR控制模式:VOLTAGE-MODE
最大输入电压:40 V最小输入电压:4.75 V
标称输入电压:12 VJESD-30 代码:X-XUUC-N
功能数量:1最高工作温度:125 °C
最低工作温度:-40 °C最大输出电流:1.8 A
封装主体材料:UNSPECIFIED封装代码:DIE
封装等效代码:DIE OR CHIP封装形状:UNSPECIFIED
封装形式:UNCASED CHIP认证状态:Not Qualified
子类别:Switching Regulator or Controllers表面贴装:YES
切换器配置:BUCK最大切换频率:63 kHz
技术:BIPOLAR温度等级:AUTOMOTIVE
端子形式:NO LEAD端子位置:UPPER
Base Number Matches:1

LM2574-3.3MDC 数据手册

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June 1999  
LM2574/LM2574HV  
SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator  
General Description  
Features  
n 3.3V, 5V, 12V, 15V, and adjustable output versions  
The LM2574 series of regulators are monolithic 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.  
n Adjustable version output voltage range, 1.23V to 37V  
(57V for HV version) 4% max over line and load  
conditions  
n Guaranteed 0.5A output current  
n Wide input voltage range, 40V, up to 60V for HV version  
n Requires only 4 external components  
n 52 kHz fixed frequency internal oscillator  
n TTL shutdown capability, low power standby mode  
n High efficiency  
±
Requiring a minimum number of external components, these  
regulators are simple to use and include internal frequency  
compensation and a fixed-frequency oscillator.  
The LM2574 series offers a high-efficiency 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.  
n Uses readily available standard inductors  
n 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  
n Simple high-efficiency step-down (buck) regulator  
n Efficient pre-regulator for linear regulators  
n On-card switching regulators  
±
Other features include a guaranteed 4% tolerance on out-  
n Positive to negative converter (Buck-Boost)  
put voltage within specified input voltages and output load  
±
conditions, and 10% on the oscillator frequency. External  
shutdown is included, featuring 50 µA (typical) standby cur-  
rent. The output switch includes cycle-by-cycle current limit-  
ing, as well as thermal shutdown for full protection under  
fault conditions.  
Typical Application (Fixed Output Voltage Versions)  
DS011394-1  
Note: Pin numbers are for 8-pin DIP package.  
Patent Pending  
SIMPLE SWITCHER is a trademark of National Semiconductor Corporation  
© 1999 National Semiconductor Corporation  
DS011394  
www.national.com  

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