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LM3243_14 PDF预览

LM3243_14

更新时间: 2024-01-19 11:16:43
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德州仪器 - TI /
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描述
High-Current Step-Down Converter for 2G/3G/4G RF Power Amplifiers

LM3243_14 数据手册

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February 24, 2012  
LM3243  
PRODUCT BRIEF  
High-Current Step-Down Converter for 2G/3G/4G RF Power  
Amplifiers  
General Description  
Features  
The LM3243 is a DC-DC converter optimized for powering  
multi-mode 2G/3G/4G RF power amplifiers (PAs) from a sin-  
gle Lithium-Ion cell. The LM3243 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.  
High-Efficiency PFM and PWM modes with Internal  
Synchronous Rectification  
Analog Bypass Function with Low Dropout Resistance  
(45 mtyp.)  
Dynamically Adjustable Output Voltage, 0.4V to 3.6V  
(typ.), in PFM and PWM modes  
2.5A Maximum Load Current in PWM Mode  
The LM3243 operates in constant frequency PWM mode pro-  
ducing a small and predictable amount of output voltage  
ripple. This enables best ECTEL power requirements in GM-  
SK and EDGE spectral compliance, with the minimal amount  
of filtering and excess headroom. When operating in PFM  
mode, the LM3243 enables the lowest DG09 current con-  
sumption and therefore maximizes system efficiency.  
2.7 MHz (average) PWM Switching Frequency  
Modulated switching frequency to aid Rx Band  
Compliance  
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  
The LM3243 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 1.4A (typ.) while still driving a 2.5A load. The ACB  
also enables operation with minimal dropout voltage. The  
LM3243 is available in a small 2 mm x 2 mm chip-scale 16-  
bump micro SMD package.  
16-bump thin micro SMD Package  
Current and Thermal Overload Protection  
Applications  
Cellular Phones  
Hand-Held Radios  
RF PC Cards  
Notice: This document is not a full datasheet. For more  
information regarding this product or to order samples,  
please contact your local Texas Instruments sales office.  
Battery-Powered RF Devices  
Typical System Application Diagram  
30132101  
© 2012 Texas Instruments Incorporated  
301321 SNVS782  
www.ti.com  

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