- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384597 > LM3205TLX (NATIONAL SEMICONDUCTOR CORP) 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers PDF資料下載
參數(shù)資料
| 型號： | LM3205TLX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers |
| 中文描述： | 1.2 A SWITCHING REGULATOR, 2300 kHz SWITCHING FREQ-MAX, PBGA8 |
| 封裝： | LEAD FREE, MICRO, SMD-8 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大小： | 1285K |
| 代理商： | LM3205TLX |
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
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PDF資料 |
PDF描述 |
|---|---|
| LM325H | Dual Voltage Regulator |
| LM325 | Dual Voltage Regulator |
| LM325A | VOLTAGE REGULATORS |
| LM325N | VOLTAGE REGULATORS |
| LM3370TLX-3806 | Dual Synchronous Step-Down DC-DC Converter with Dynamic Voltage Scaling Function |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM3205TLX/NOPB | 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK |
| LM3206 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:650mA Miniature, Step-Down DC-DC Converter for Portable Applications |
| LM3206TL | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:650mA Miniature, Step-Down DC-DC Converter for Portable Applications |
| LM3206TL/NOPB | 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK |
| LM3206TLEV/NOPB | 功能描述:BOARD EVAL LM3206TL RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓撲結構:升壓 頻率 - 開關:3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
發(fā)布緊急采購，3分鐘左右您將得到回復。