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SD3118-2R2 PDF预览

SD3118-2R2

更新时间： 2024-11-03 01:18:19
品牌 Logo 应用领域
思佳讯 - SKYWORKS /
页数 文件大小 规格书
22页 1779K
描述
600mA Voltage-Scaling Step-Down Converter for RF Power Amplifiers with Bypass Switch

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SD3118-2R2 数据手册

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DATA SHEET  
AAT1171  
600mA Voltage-Scaling Step-Down Converter  
for RF Power Amplifiers with Bypass Switch  
General Description  
Features  
The AAT1171 SwitchReg™ dynamically controls the oper-  
ating voltage of a WCDMA or CDMA power amplifier  
inside single-cell, 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.  
• VIN Range: 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  
• Over-Temperature and Current Limit Protection  
• Integrated 85mΩ Bypass MOSFET  
• 2MHz Operation  
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 switch-  
ing frequency minimizes the size of external components  
while keeping switching losses low. To further improve  
system efficiency, an 85mΩ bypass MOSFET transistor is  
also included to allow the PA to be powered directly from  
the battery.  
• PWM/LL Control with Override  
• Fast Start-Up:  
50μs (AAT1171-4, AAT1171-5)  
150μs (AAT1171-1)  
• 100% Duty Cycle Operation  
▪
▪
The AAT1171 maintains high efficiency thoughout the  
entire load range in Light Load (LL) mode, and can be  
forced into Pulse Wide Modulation (PWM) mode for low  
noise operation or can be synchronized to an external  
clock.  
• <30μs Output Voltage Response Time  
• 3x3mm 12-Pin TDFN or 1.535x2.235mm 12-Pin  
WLCSP Package  
• Temperature Range: -40°C to +85°C  
The AAT1171 is available in a Pb-free, space-saving  
TDFN33-12 or 12-pin wafer-level chip scale package  
(WLCSP) and is rated over the -40°C to +85°C tempera-  
ture range.  
Applications  
• WCDMA or CDMA PA in Cellular Phones, Smartphones,  
Feature Phones, etc.  
• Express Card  
• PCMCIA Data Cards  
Typical Application  
L1  
L1  
4.7μH  
2.2μH  
VIN  
0.6V - 3.6V  
VIN  
0.6V - 3.6V  
LX  
LX  
VCC  
VCC  
AAT1171-1/  
AAT1171-4  
AAT1171-5  
CIN  
4.7μF  
CIN  
4.7μF  
COUT  
10μF  
COUT  
4.7μF  
–
–
VOUT  
BYPASS  
MODE/SYNC  
EN  
VOUT  
BYPASS  
MODE/SYNC  
EN  
VCC2  
GNDx2  
DAC  
VCONT  
PA  
VCC2  
GNDx2  
DAC  
VCONT  
PA  
VCC2  
VCC2  
VREF  
VREF  
DAC  
Baseband  
Processor  
DAC  
Baseband  
Processor  
TX  
RX  
TX  
RX  
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com  
1
201999B  
• Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013  
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