5秒后页面跳转
LM3253-C PDF预览

LM3253-C

更新时间: 2024-11-13 11:14:59
品牌 Logo 应用领域
德州仪器 - TI 放大器功率放大器转换器
页数 文件大小 规格书
26页 574K
描述
用于 2G/3G/4G 功率放大器的高电流降压直流/直流转换器

LM3253-C 数据手册

 浏览型号LM3253-C的Datasheet PDF文件第2页浏览型号LM3253-C的Datasheet PDF文件第3页浏览型号LM3253-C的Datasheet PDF文件第4页浏览型号LM3253-C的Datasheet PDF文件第5页浏览型号LM3253-C的Datasheet PDF文件第6页浏览型号LM3253-C的Datasheet PDF文件第7页 
LM3253  
www.ti.com  
SNVS791Q FEBRUARY 2012REVISED MAY 2013  
LM3253 High-Current Step-Down Converter for 2G/3G/4G RF Power Amplifiers  
Check for Samples: LM3253  
1
FEATURES  
2
High-Efficiency PFM and PWM Modes with  
Internal Synchronous Rectification  
DESCRIPTION  
The LM3253 is a DC-DC converter optimized for  
powering multi-mode 2G/3G/4G RF power amplifiers  
(PAs) from a single Lithium-Ion cell. The LM3253  
steps down an input voltage from 2.7V to 5.5V to a  
dynamically adjustable output voltage of 0.4V to 3.6V.  
The output voltage is set through a VCON analog  
input that adjusts the output voltage to ensure  
efficient operation at all power levels of the RF PA.  
The LM3253 is optimized for USB datacard  
applications.  
Analog Bypass Function with Low Dropout  
Resistance (45 mtyp.)  
Dynamically Adjustable Output Voltage, 0.4V  
to 3.6V (typ.), in PFM and PWM modes  
3A Maximum Load Current in PWM Mode  
2.7MHz (average) PWM Switching Frequency  
Modulated Switching Frequency to Aid Rx  
Band Compliance  
The LM3253 operates in constant frequency Pulse  
Width Modulation (PWM) mode producing a small  
and predictable amount of output voltage ripple. This  
enables best ECTEL power requirements in GMSK  
and EDGE spectral compliance, with the minimal  
amount of filtering and excess headroom. When  
operating in Pulse Frequency Modulation (PFM)  
mode, the LM3253 enables the lowest DG09 current  
consumption and therefore maximizes system  
efficiency.  
Operates From a Single Li-ion Cell  
(2.7V to 5.5V)  
ACB Reduces Inductor Requirements and Size  
Minimum Total Solution Size by Using Small  
Footprint and Case Size Inductor and  
Capacitors  
16-bump Thin DSBGA Package  
Current and Thermal Overload Protection  
The LM3253 has a unique Active Current assist and  
analog Bypass (ACB) feature to minimize inductor  
size without any loss of output regulation for the  
entire battery voltage and RF output power range,  
until dropout. ACB provides a parallel current path,  
when needed, to limit the maximum inductor current  
to 1.84A (typ.) while still driving a 3A load. The ACB  
also enables operation with minimal dropout voltage.  
The LM3253 is available in a small 2 mm x 2 mm  
chip-scale 16-bump DSBGA package.  
APPLICATIONS  
USB Datacards  
Cellular Phones  
Hand-Held Radios  
RF PC Cards  
Battery-Powered RF Devices  
When considering the use of the LM3253 in a system  
design, contact the Texas Instruments Sales or Field  
Application engineer for a copy of the "LM3253:  
DC-DC Converter for 3G/4G RF PAs PCB Layout  
Considerations.”  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
2
All trademarks are the property of their respective owners.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2012–2013, Texas Instruments Incorporated  

与LM3253-C相关器件

型号 品牌 获取价格 描述 数据表
LM3253TMX/NOPB TI

获取价格

用于 2G/3G/4G 功率放大器的高电流降压直流/直流转换器 | YFQ | 16 |
LM325A NSC

获取价格

VOLTAGE REGULATORS
LM325AN NSC

获取价格

IC VREG DUAL OUTPUT, FIXED MIXED REGULATOR, PDIP14, PLASTIC, DIP-14, Fixed Mixed Multiple
LM325AN/B+ ETC

获取价格

Negative & Positive Fixed Voltage Regulator
LM325H NSC

获取价格

Dual Voltage Regulator
LM325N NSC

获取价格

VOLTAGE REGULATORS
LM325N/B+ ETC

获取价格

Negative & Positive Fixed Voltage Regulator
LM326 NSC

获取价格

VOLTAGE REGULATORS
LM3262 TI

获取价格

具有旁路模式的 6MHz、800mA 微型、可调节、直流/直流降压转换器
LM3262TME/NOPB TI

获取价格

具有旁路模式的 6MHz、800mA 微型、可调节、直流/直流降压转换器 | YFQ |