LM3208TLX，国半代理商

650mA微型，可调节，降压DC-DC转换器RF功率放大器一般描述该LM3208是DC-DC优化电源转换器RF功率放大器(PAs)从单节锂离子电池.但是，它可能被用于许多其他应用.它的步骤在从下一个输入电压范围2.7V 5.5V到可调输出电压的0.8V到3.6V.输出电压为通过使用一个VCON模拟输入来控制功率水平和效率的RF功率放大器.该LM3208提供性能优越的移动电话和类似RF PA的应用.固定频率PWM运忧思减少RF干扰.关断功能关闭设备关闭，减少电池消耗0.01 μA(typ.).该LM3208可在一8-pin无铅微SMD包装.高开关频率允许使用(2 MHz typ.)微小的表面贴装元件.只有三个小的外部表面贴装元件，电感和两个陶瓷电容器，是必需的.特点nnnnnnnnn2 MHz (typ.) PWM开关频率从单一Li-Ion 电池 (2.7V工作于5.5V)可调输出电压(0.8V到3.6V)快速输出电压暂态(0.8V到3.4V在25μstyp.)650mA最大负载能力高效率的(95% typ. 3.9VIN, 3.4VOUT在400mA)8-pin微SMD 包装电流过载保护过热保护应用nnnn蜂巢式电话手持对讲机RF PC卡电池供电设备RF
LM3208TLX
器件描述：650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers
器件厂商：NSC [National SemIConductor]
厂商主页：http://www.national.com
文件大小：1650.27KB，共17页
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Sponsor by e络盟器件资料摘要：LM3208
650mA Miniature, Adjustable, Step-Down DC-DC
Converter for RF Power Amplifiers
General Description
The LM3208 is a DC-DC converter optimized for powering
RF power amplifiers (PAs) from a single Lithium-Ion cell.
However, it may be used in many other applications. It steps
down an input voltage in the range from 2.7V to 5.5V to an
adjustable output voltage of 0.8V to 3.6V. Output voltage is
set by using a V
CON
analog input to control power levels and
efficiency of the RF PA.
The LM3208 offers superior performance for mobile phones
and similar RF PA applications. Fixed-frequency PWM op-
eration minimizes RF interference. A shutdown function turns
the device off and reduces battery consumption to 0.01 μA
(typ.).
The LM3208 is available in an 8-pin lead-free micro SMD
package. A high switching frequency (2 MHz typ.) allows use
of tiny surface-mount components. Only three small external
surface-mount components, an inductor and two ceramic
capacitors, are required.
Features
n 2 MHz (typ.) PWM Switching Frequency
n Operates from a single Li-Ion cell (2.7V to 5.5V)
n Adjustable Output Voltage (0.8V to 3.6V)
n Fast Output Voltage Transient (0.8V to 3.4V in 25μs
typ.)
n 650mA Maximum load capability
n High Efficiency (95% typ. at 3.9V
IN
, 3.4V
OUT
at 400mA)
n 8-pin micro SMD Package
n Current Overload Protection
n Thermal Overload Protection
Applications
n Cellular Phones
n Hand-Held Radios
n RF PC Cards
n Battery Powered RF Devices
Typical Application
20166301
FIGURE 1. LM3208 Typical Application
April 2006
LM3208
650mA
Miniature,
Adjustable,
Step-Down
DC-DC
Converter
for
RF
Power
Amplifiers