Datasheet > AAT1171

AAT1171

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		转换器开关放大器功率放大器
页数	文件大小	规格书
22页	791K
描述
600mA Voltage-Scaling Step-Down Converter for RF Power Amplifiers with Bypass Switch

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AAT1171 数据手册

AAT1171

600mA Voltage-Scaling Step-Down Converter

for RF Power Amplifiers with Bypass Switch

™

SwitchReg

General Description

Features

The AAT1171 SwitchReg, a member of Analogic-

Tech's Total Power Management IC™ (TPMIC™)

product family, has been specifically designed to

dynamically control the operating voltage of a

WCDMA or CDMA power amplifier inside single

lithium-ion battery-powered systems. The AAT1171

outputs a voltage between 0.6V and 3.6V, thereby

optimizing the amplifier efficiency at both low and

high transmit levels.

•

V_INRange: 2.7V to 5.5V

Variable Output Voltage: 0.6V to 3.6V

600mA Output Current

DAC Input: 0.2V to 1.2V

High Output Accuracy: ±3%

45µA No Load Quiescent Current

Internal Soft Start Limits Startup Current and

Output Voltage Overshoot

Synchronizable to External 19.8MHz System

Clock

•

The AAT1171 output voltage is controlled via an

analog signal from the baseband processor. It can

deliver 600mA of continuous load current while

maintaining a low 45µA of no load quiescent current.

The 2MHz switching frequency minimizes the size of

external components while keeping switching losses

low. A low resistance MOSFET, typically 230mΩ,

provides a low dropout voltage as the battery input

voltage approaches the programmed output voltage

and the converter runs at 100% duty cycle. To fur-

ther improve system efficiency, an 85mΩ bypass

MOSFET transistor is also included to allow the PA

to be powered directly from the battery.

•

Over-Temperature and Current Limit Protection

Integrated 85mΩ Bypass MOSFET

2MHz Operation

PWM/LL Control with Override

Fast 150µs Start-Up

3x3mm 12-Pin TDFN Package

Temperature Range: -40°C to +85°C

Applications

•

WCDMA or CDMA PA in Cellular Phones,

Smartphones, Feature Phones, etc.

Express Card

The AAT1171 feedback and control method gives

excellent load regulation and transient response

while maintaining small external components. The

output voltage responds in less than 30µs. The con-

verter can be synchronized to an external system

clock, forced to operate in Light Load (LL) mode for

highest efficiency at light loads, or in Pulse Width

Modulation (PWM) mode for low noise operation.

•

PCMCIA Data Cards

The AAT1171 is available in a Pb-free, space-sav-

ing TDFN33-12 package and is rated over the

-40°C to +85°C temperature range.

Typical Application

2.2µH

VIN

0.6V - 3.6V

AAT1171

10µF

VCC

BYPASS

–

4.7µF

VOUT

MODE/SYNC

V_CC2

V_CONT

GNDx2

DAC

V_CC2

V_REF

DAC

Baseband

Processor

1171.2006.06.1.0

12 3 4 5 6 7...22

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AAT1171IWP-4-T1	SKYWORKS	600mA Voltage-Scaling Step-Down Converter for RF Power Amplifiers with Bypass Switch	获取价格
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