LM3243TMX/NOPB [TI]

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/直流转换器 | YFQ | 16 | -30 to 90;


型号：	LM3243TMX/NOPB
厂家：	TEXAS INSTRUMENTS
描述：	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/直流转换器 \| YFQ \| 16 \| -30 to 90 放大器功率放大器转换器
文件：	总5页 (文件大小：138K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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

Physical Dimensions inches (millimeters) unless otherwise noted

16-Bump Thin Micro SMD, Large Bump

X1 = 2023 µm ± 30 µm

X2 = 2023 µm ± 30 µm

X3 = 600 µm

NS Package Number TMD16SSA

www.ti.com

Notes

www.ti.com

Notes

www.ti.com

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