Datasheet > 电源电路 > 开关式稳压器或控制器> LM2574-3.3MDC

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

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技术参数
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LM2574-3.3MDC 技术参数

生命周期：	Transferred	包装说明：	DIE, DIE OR CHIP
Reach Compliance Code：	unknown	ECCN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 V	JESD-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

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

DS011394

www.national.com

12 3 4 5 6 7...24

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与LM2574-3.3MDC相关器件

型号	品牌	获取价格	描述	数据表
LM2574-3.3MWC	NSC	获取价格	IC 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator o
LM2574-3.3YN	MICREL	获取价格	52kHz Simple 0.5A Buck Regulator
LM2574-5	MOTOROLA	获取价格	EASY SWITCHERE⑩ 0.5 A STEP-DOWN VOLTAGE REGUL
LM2574-5.0BN	MICREL	获取价格	52KHZ SIMPLE 0.5A BUCK REGULATOR
LM2574-5.0BWM	MICREL	获取价格	52kHz Simple 0.5A Buck Regulator
LM2574-5.0MDA	NSC	获取价格	IC,SMPS CONTROLLER,VOLTAGE-MODE,BIPOLAR,DIE
LM2574-5.0MWA	NSC	获取价格	IC,SMPS CONTROLLER,VOLTAGE-MODE,BIPOLAR,WAFER
LM2574-5.0MWC	NSC	获取价格	IC 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator o
LM2574-5.0YN	MICREL	获取价格	52kHz Simple 0.5A Buck Regulator
LM2574-ADJ	MOTOROLA	获取价格	EASY SWITCHERE⑩ 0.5 A STEP-DOWN VOLTAGE REGUL

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