AAT1143 데이터 시트보기 (PDF) - Skyworks Solutions
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AAT1143 Datasheet PDF : 19 Pages
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General Description
The AAT1143 SwitchReg™ is a 1MHz step-down con-
verter with an input voltage range of 2.7V to 5.5V and
output as low as 0.6V. Its low supply current, small size,
and high switching frequency make the AAT1143 the
ideal choice for portable applications.
The AAT1143 is available in either a fixed version with
internal feedback or a programmable version with exter-
nal feedback resistors. It can deliver 400mA of load cur-
rent while maintaining a low 25μA no load quiescent
current. The 1MHz switching frequency minimizes the
size of external components while keeping switching
losses low. The AAT1143 feedback and control delivers
excellent load regulation and transient response with a
small output inductor and capacitor.
The AAT1143 is designed to maintain high efficiency
throughout the operating range, which is critical for por-
table applications.
The AAT1143 is available in a space-saving 2.0 x 2.2mm
SC70JW-8 package and is rated over the -40°C to +85°C
temperature range.
DATA SHEET
AAT1143
1MHz 400mA Step-Down Converter
Features
• VIN Range: 2.7V to 5.5V
• VOUT Adjustable Down to 0.6V
▪ Fixed or Adjustable Version
• 25μA No Load Quiescent Current
• Up to 95% Efficiency
• 400mA Max Output Current
• 1MHz Switching Frequency
• Soft Start
• Over-Temperature Protection
• Current Limit Protection
• 100% Duty Cycle Low-Dropout Operation
• 0.1μA Shutdown Current
• SC70JW-8 Package
• Temperature Range: -40°C to +85°C
Applications
• Cellular Phones
• Digital Cameras
• Handheld Instruments
• Microprocessor / DSP Core / IO Power
• PDAs and Handheld Computers
• USB Devices
Typical Application (Fixed Output Voltage)
VIN
C2
4.7μF
U1
AAT1143
3 VIN
LX 4
1 EN
OUT 2
5 AGND PGND 7
8 PGND PGND 6
L1
4.7μH
VO
C1
4.7μF
Efficiency vs. Load Current
(VOUT = 2.5V; VIN = 3.3V)
100
95
90
85
80
75
70
65
60
0.1
1
10
100
1000
Output Current (mA)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201983B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 25, 2013
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