Datasheet > LM3243_14

LM3243_14

更新时间： 2024-11-22 02:58:43

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描述
High-Current Step-Down Converter for 2G/3G/4G RF Power Amplifiers

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LM3243_14 数据手册

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 mΩ typ.)

■

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

301321 SNVS782

www.ti.com

12 3 4 5

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与LM3243_14相关器件

型号	品牌	获取价格	描述	数据表
LM3243TME/NOPB	TI	获取价格	适用于 2G/3G/4G 功率放大器、具有模拟旁路模式的 2.7MHz、2.5A 降压直流
LM3243TMX/NOPB	TI	获取价格	适用于 2G/3G/4G 功率放大器、具有模拟旁路模式的 2.7MHz、2.5A 降压直流
LM3248	TI	获取价格	LM3248 2.7 MHz, 2.5A Adjustable Boost-Buck DC/DC Converter
LM3248TME/NOPB	TI	获取价格	LM3248 2.7 MHz, 2.5A Adjustable Boost-Buck DC/DC Converter
LM3248TMENOPB	TI	获取价格	LM3248 2.7 MHz, 2.5A Adjustable Boost-Buck DC/DC Converter
LM3248TMX/NOPB	TI	获取价格	LM3248 2.7 MHz, 2.5A Adjustable Boost-Buck DC/DC Converter
LM3248TMXNOPB	TI	获取价格	LM3248 2.7 MHz, 2.5A Adjustable Boost-Buck DC/DC Converter
LM324A	ONSEMI	获取价格	Single Supply Quad Operational Amplifiers
LM324A	TI	获取价格	QUADRUPLE OPERATIONAL AMPLIFIERS
LM324A	NXP	获取价格	Low power quad op amps

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