- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384597 > LM3205 (National Semiconductor Corporation) 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers PDF資料下載
參數(shù)資料
| 型號： | LM3205 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers |
| 中文描述： | 六百五十零毫安微型，可調(diào)，降壓型DC - DC轉(zhuǎn)換器的射頻功率放大器 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 1285K |
| 代理商： | LM3205 |
Block Diagram
Operation Description
The LM3205 is a simple, step-down DC-DC converter opti-
mized for powering RF power amplifiers (PAs) in mobile
phones, portable communicators, and similar battery pow-
ered RF devices. It is designed to allow the RF PAto operate
at maximum efficiency over a wide range of power levels
from a single Li-Ion battery cell. It is based on a current-
mode buck architecture, with synchronous rectification for
high efficiency. It is designed for a maximum load capability
of 650mA in PWM mode.
Maximum load range may vary from this depending on input
voltage, output voltage and the inductor chosen.
Efficiency is typically around 96% for a 400mAload with 3.4V
output, 4.2V input. The output voltage is dynamically pro-
grammable from 0.8V (typ.) to 3.6V (typ.) by adjusting the
voltage on the control pin without the need for external
feedback resistors. This ensures longer battery life by being
able to change the PAsupply voltage dynamically depending
on its transmitting power.
Additional features include current overload protection and
thermal overload shutdown.
The LM3205 is constructed using a chip-scale 8-pin mi-
croSMD or 10-pin LLP package. These packages offers the
smallest possible size, for space-critical applications such as
cell phones, where board area is an important design con-
sideration. Use of a high switching frequency (2MHz) re-
duces the size of external components. As shown in
Figure
1
, only three external power components are required for
implementation. Use of a microSMD package requires spe-
cial design considerations for implementation. (See mi-
croSMD Package Assembly and use in the Applications
Information section.) Its fine bump-pitch requires careful
board design and precision assembly equipment. Use of this
package is best suited for opaque-case applications, where
its edges are not subject to high-intensity ambient red or
infrared light. Also, the system controller should set EN low
during power-up and other low supply voltage conditions.
(See Shutdown Mode in the Device Information section.)
20158035
FIGURE 2. Functional Block Diagram
L
www.national.com
11
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM3205SD-2 | 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers |
| LM3205SDX-2 | 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers |
| LM3205TL | 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers |
| LM3205TLX | 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers |
| LM325H | Dual Voltage Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM320-5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| LM3205_09 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers |
| LM3205SD-2 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers |
| LM3205SD-2/NOPB | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| LM3205SDX-2 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。