Datasheet > LM3253-C

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

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LM3253-C 数据手册

LM3253

www.ti.com

SNVS791Q –FEBRUARY 2012–REVISED MAY 2013

LM3253 High-Current Step-Down Converter for 2G/3G/4G RF Power Amplifiers

Check for Samples: LM3253

FEATURES

•

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 mΩ typ.)

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.”

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.

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.

12 3 4 5 6 7...26

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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 \|

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