Datasheet > LM3253

LM3253

更新时间： 2024-11-12 11:46:03

品牌	Logo	应用领域
德州仪器 - TI		转换器射频
页数	文件大小	规格书
5页	139K
描述
High-Current Step-Down Converter for 2G/3G/4G RF Power

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LM3253 数据手册

March 16, 2012

LM3253

PRODUCT BRIEF

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

Amplifiers

General Description

Features

The LM3253 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 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.

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

■

3.0A Maximum Load Current in PWM Mode

■

2.7 MHz (average) PWM Switching Frequency

The LM3253 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 LM3253 enables the lowest DG09 current con-

sumption and therefore maximizes system efficiency.

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 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 3.0A 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 micro SMD package.

16-bump thin micro SMD Package

■

Current and Thermal Overload Protection

Applications

USB Datacards

■

Cellular Phones

Hand-Held Radios

RF PC Cards

Notice: This document is not a datasheet. For more in-

formation regarding this product or to order samples,

please contact your local Texas Instruments sales office.

Battery-Powered RF Devices

■

Typical System Application Diagram

30179701

301797 SNVS791A

www.ti.com

12 3 4 5

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与LM3253相关器件

型号	品牌	获取价格	描述	数据表
LM3253-C	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
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

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