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LM3207

更新时间： 2024-11-24 04:44:31
品牌 Logo 应用领域
美国国家半导体 - NSC 转换器放大器射频功率放大器
页数 文件大小 规格书
19页 1334K
描述
650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers with Integrated Vref LDO

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LM3207 数据手册

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August 2006  
LM3207  
650mA Miniature, Adjustable, Step-Down DC-DC  
Converter for RF Power Amplifiers with Integrated Vref  
LDO  
General Description  
Features  
n
2MHz (typ.) PWM Switching Frequency  
The LM3207 is a DC-DC converter optimized for powering  
WCDMA / CDMA RF power amplifiers (PAs) from a single  
Lithium-Ion cell; however they may be used in many other  
applications. It steps down an input voltage from 2.7V to  
n Operates from a single Li-Ion cell (2.7V to 5.5V)  
n Variable Output Voltage (0.8V to 3.6V)  
n 650mA Maximum load capability  
n High Efficiency (95% Typ at 3.9VIN, 3.4VOUT at 400mA)  
from internal synchronous rectification  
n Integrated 2.875V Vref LDO  
5.5V to  
a variable output voltage from 0.8V(typ.) to  
3.6V(typ.). Output voltage is set using a VCON analog input  
for controlling power levels and efficiency of the RF PA.  
The LM3207 also provides a regulated reference voltage(V-  
ref) required by linear RF power amplifiers through an inte-  
grated LDO with a nominal output voltage of 2.875V and  
maximum Iref of 10 mA.  
n Regulated LDO Output up to 10mA max  
n Fast 3uS Vref LDO On/Off Time  
n 9-pin micro SMD Package  
n Current Overload Protection  
n Thermal Overload Protection  
The LM3207 is available in a 9-pin lead free micro SMD  
package. High switching frequency (2MHz) allows use of  
surface-mount components. Only four small external  
surface-mount components are required, an inductor and  
three ceramic capacitors.  
Applications  
n Cellular Phones  
n Hand-Held Radios  
n RF PC Cards  
n Battery Powered RF Devices  
Typical Application  
20165301  
FIGURE 1. LM3207 Typical Application  
© 2006 National Semiconductor Corporation  
DS201653  
www.national.com  
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