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LM3280TL-275 PDF预览

LM3280TL-275

更新时间: 2024-11-12 02:52:43
品牌 Logo 应用领域
美国国家半导体 - NSC 转换器开关射频输出元件
页数 文件大小 规格书
22页 792K
描述
Adjustable Step-Down DC-DC Converter and 3 LDOs for RF Power Management

LM3280TL-275 数据手册

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January 2007  
LM3280  
Adjustable Step-Down DC-DC Converter and 3 LDOs for RF  
Power Management  
General Description  
The LM3280 is a multi-functional Power Management Unit,  
optimized for low-power handheld applications such as Cel-  
lular Phones.  
The LM3280 incorporates three low-dropout LDO voltage  
regulators and one step down PWM DC-DC converter with an  
internal Bypass FET. The step down converter's output volt-  
age can be set using an analog input (VCON) for optimizing  
efficiency of the RF PA at various power levels. The LDO op-  
erates a nominal output voltage of 2.85V and maximum load  
current capability of 20mA for a reference voltage required by  
linear RF power amplifiers. The LM3280 additionally features  
a separate enable pin for each output.  
Features  
2MHz (typ.) PWM Switching Frequency  
Operates from a single Li-Ion cell (2.7V to 5.5V)  
Adjustable Output Voltage (0.8V to 3.6V) DC-DC  
High-efficiency synchronous buck converter  
300mA Maximum load capability (PWM mode)  
500mA Maximum load capability (Bypass mode)  
PWM, Forced and Automatic Bypass Mode  
3 Low-dropout and fast transient response LDOs  
16-pin micro SMD Package  
Current Overload Protection  
Thermal Overload Protection  
The LM3280 is available in a 16-pin lead free micro SMD  
package.  
Applications  
Cellular Phones  
Hand-Held Radios  
Battery Powered RF Devices  
Typical Application  
20181901  
FIGURE 1. LM3280 Typical Application  
© 2007 National Semiconductor Corporation  
201819  
www.national.com  

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