AAT1123 Datasheet, PDF (1/18 Pages) Advanced Analogic Technologies – 1MHz Step-Down Converter

General Description
The AAT1123 SwitchReg™ is a member of Skyworks'
Total Power Management IC (TPMIC™) product family. It
is a 1MHz step-down converter 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 AAT1123 the ideal choice for portable applica-
tions.
The AAT1123 is available in either a fixed version with
internal feedback or a programmable version with exter-
nal feedback resistors. It can deliver up to 600mA of load
current 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 AAT1123 feedback and control delivers
excellent load regulation and transient response with a
small output inductor and capacitor.
The AAT1123 is designed to maintain high efficiency
throughout the operating range and provides fast turn-
on time.
The AAT1123 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
AAT1123
1MHz Step-Down Converter
Features
• V_IN Range: 2.7V to 5.5V
• V_{OUT Adjustable Down to 0.6V}
▪ Fixed or Adjustable Version
• Fast Turn-On Time (100μs Typical)
• 25μA No Load Quiescent Current
• Up to 97% Efficiency
• Output Current Up to 600mA
• 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)
V_IN
C2
4.7μF
U1
AAT1123
3 _VIN
LX ⁴
1 _EN
OUT ²
5 _{AGND PGND} 7
8 _{PGND PGND} 6
L1
4.7μH
V_O
C1
22μF
AAT1123 Efficiency
(V_OUT = 2.5V; L = 10μH)
100
90
V_IN = 3.3V
80
70
60
0.1
1
10
100
1000
Output Current (mA)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
201975B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013
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