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LM2574-3.3BN PDF预览

LM2574-3.3BN

更新时间: 2024-11-18 22:51:55
品牌 Logo 应用领域
麦瑞 - MICREL 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
页数 文件大小 规格书
8页 43K
描述
52KHZ SIMPLE 0.5A BUCK REGULATOR

LM2574-3.3BN 技术参数

是否Rohs认证:不符合生命周期:Obsolete
包装说明:PLASTIC, DIP-8Reach Compliance Code:not_compliant
风险等级:5.75Is Samacsys:N
模拟集成电路 - 其他类型:SWITCHING REGULATOR控制模式:VOLTAGE-MODE
控制技术:PULSE WIDTH MODULATION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:R-PDIP-T8JESD-609代码:e0
长度:9.525 mm功能数量:1
端子数量:8最高工作温度:85 °C
最低工作温度:-40 °C最大输出电流:1.8 A
标称输出电压:3.3 V封装主体材料:PLASTIC/EPOXY
封装代码:DIP封装等效代码:DIP8,.3
封装形状:RECTANGULAR封装形式:IN-LINE
峰值回流温度(摄氏度):240认证状态:Not Qualified
子类别:Switching Regulator or Controllers最大供电电流 (Isup):10 mA
表面贴装:NO切换器配置:BUCK
最大切换频率:63 kHz技术:BIPOLAR
温度等级:INDUSTRIAL端子面层:Tin/Lead (Sn85Pb15)
端子形式:THROUGH-HOLE端子节距:2.54 mm
端子位置:DUAL处于峰值回流温度下的最长时间:30
宽度:7.62 mmBase Number Matches:1

LM2574-3.3BN 数据手册

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LM2574  
52kHz Simple 0.5A Buck Regulator  
General Description  
Features  
The LM2574 family is a series of easy to use fixed and  
adjustable switching voltage regulators. The LM2574 con-  
tains all of the active circuitry necessary to construct a  
stepdown(buck)switchingregulatorandrequiresaminimum  
of external components.  
3.3V, 5V, 12V, and adjustable output versions  
Adjustable version output 1.23V to 37V ±4% max. over  
line and load conditions.  
Guaranteed 0.5A output current  
Wide input voltage, up to 40V  
Thermal shutdown and current limit protection  
Requires only 4 external components.  
Shutdown capability (standby mode)  
Low power standby mode < 200µA Typical  
High-efficiency  
TheLM2574isavailablein3.3Vand5Vfixedoutputversions,  
oranadjustableversionwithanoutputvoltagerangeof1.23V  
to 37V. Output voltage is guaranteed to ±4% for specified  
input and load conditions.  
TheLM2574cansupply0.5Awhilemaintainingexcellentline  
and load regulation. The output switch includes cycle-by-  
cycle current limiting, as well as thermal shutdown for full  
protection under fault conditions.  
52kHz fixed frequency internal oscillator  
Uses standard inductors  
Applications  
Anexternalshutdownconnectionselectsoperatingorstandby  
modes. Standby current is less than 200µA.  
Simple high-efficiency step-down (buck) regulator  
Efficient pre-regulator for linear regulators  
On-card switching regulators  
Heat sinks are generally unnecessary due the regulator’s  
highefficiency. Adequateheattransferisusuallyprovidedby  
soldering all package pins to a printed circuit board.  
Positive to negative converter (buck-boost)  
The LM2574 includes internal frequency compensation and  
an internal 52kHz fixed frequency oscillator guaranteed to  
±10% of the frequency.  
Ordering Information  
Part Number  
LM2574BN  
Junction Temp. Range  
40°C to +85°C  
Package  
8-pin Plastic DIP  
8-pin Plastic DIP  
8-pin Plastic DIP  
Circuits constructed around the LM2574 use a standard  
series of inductors which are available from several different  
manufacturers.  
LM2574-3.3BN  
LM2574-5.0BN  
40°C to +85°C  
40°C to +85°C  
All support documentation can be found on Micrel’s web  
site at www.micrel.com.  
Typical Application  
40V MAX  
UNREGULATED  
DC IN  
FB  
VIN  
REGULATED  
OUTPUT  
0.5A  
CIN  
22µF  
330µH  
LM2574  
OUT  
PWR  
SIG ON/  
GND GND OFF  
COUT  
220µF  
11DQ05  
Figure 1. Fixed Output Regulator Circuit  
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com  
M9999-122303  
December 2003  
1

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