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LM2748MTC

更新时间： 2024-11-24 23:16:47
品牌 Logo 应用领域
美国国家半导体 - NSC 控制器时钟
页数 文件大小 规格书
23页 1047K
描述
Synchronous Buck Controller with Pre-bias Startup, and Optional Clock Synchronization

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中文翻译

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LM2748MTC 技术参数

是否Rohs认证： 不符合生命周期：Transferred
包装说明：PLASTIC, TSSOP-14Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.18模拟集成电路 - 其他类型：SWITCHING CONTROLLER
控制模式：VOLTAGE-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：6 V最小输入电压：3 V
标称输入电压：3.3 VJESD-30 代码：R-PDSO-G14
JESD-609代码：e0长度：5 mm
湿度敏感等级：1功能数量：1
端子数量：14最高工作温度：125 °C
最低工作温度：-40 °C封装主体材料：PLASTIC/EPOXY
封装代码：SSOP封装等效代码：TSSOP14,.25
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, SHRINK PITCH
峰值回流温度（摄氏度）：260认证状态：Not Qualified
座面最大高度：1.1 mm子类别：Switching Regulator or Controllers
表面贴装：YES切换器配置：PUSH-PULL
最大切换频率：1000 kHz温度等级：AUTOMOTIVE
端子面层：Tin/Lead (Sn/Pb)端子形式：GULL WING
端子节距：0.65 mm端子位置：DUAL
处于峰值回流温度下的最长时间：40宽度：4.4 mm
Base Number Matches：1

LM2748MTC 数据手册

 浏览型号LM2748MTC的Datasheet PDF文件第2页浏览型号LM2748MTC的Datasheet PDF文件第3页浏览型号LM2748MTC的Datasheet PDF文件第4页浏览型号LM2748MTC的Datasheet PDF文件第5页浏览型号LM2748MTC的Datasheet PDF文件第6页浏览型号LM2748MTC的Datasheet PDF文件第7页 
May 2005  
LM2745/8  
Synchronous Buck Controller with Pre-bias Startup, and  
Optional Clock Synchronization  
General Description  
Features  
n Switching frequency from 50 kHz to 1 MHz  
n Switching frequency synchronize range 250 kHz to 1  
MHz (LM2745 Only)  
The LM2745/8 are high-speed synchronous buck regulator  
controllers with an accurate feedback voltage accuracy of  
1.5%. It can provide simple down conversion to output  
voltages as low as 0.6V. Though the control sections of the  
IC are rated for 3 to 6V, the driver sections are designed to  
accept input supply rails as high as 14V. The use of adaptive  
non-overlapping MOSFET gate drivers helps avoid potential  
shoot-through problems while maintaining high efficiency.  
The IC is designed for the more cost-effective option of  
driving only N-channel MOSFETs in both the high-side and  
low-side positions. It senses the low-side switch voltage drop  
for providing a simple, adjustable current limit.  
n Startup with a pre-biased output load  
n Power stage input voltage from 1V to 14V  
n Control stage input voltage from 3V to 6V  
n Output voltage adjustable down to 0.6V  
n Power Good flag and shutdown  
n Output overvoltage and undervoltage detection  
n
1.5% feedback voltage accuracy over temperature  
n Low-side adjustable current sensing  
n Adjustable soft-start  
n Tracking and sequencing with shutdown and soft start  
pins  
The LM2745/8 features a fixed-frequency voltage-mode  
PWM control architecture which is adjustable from 50 kHz to  
1 MHz with one external resistor. In addition, the LM2745  
also allows the switching frequency to be synchronized to an  
external clock signal over the range of 250 kHz to 1 MHz.  
This wide range of switching frequency gives the power  
supply designer the flexibility to make better tradeoffs be-  
tween component size, cost and efficiency.  
n TSSOP-14 package  
Applications  
n Down Conversion from 3.3V  
n Cable Modem, DSL and ADSL  
n Laser Jet and Ink Jet Printers  
n Low Voltage Power Modules  
n DSP, ASIC, Core and I/O  
Features include the ability to startup with a pre-biased load  
on the output, soft-start, input undervoltage lockout (UVLO)  
and Power Good (based on both undervoltage and overvolt-  
age detection). In addition, the shutdown pin of the IC can be  
used for providing startup delay, and the soft-start pin can be  
used for implementing precise tracking, for the purpose of  
sequencing with respect to an external rail.  
Typical Application  
20137401  
© 2005 National Semiconductor Corporation  
DS201374  
www.national.com  
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