SwitchReg
™
AAT1154
1MHz 3A Buck DC/DC Converter
Preliminary Information
1154.2003.08.0.91 1
General Description
The AAT1154 SwitchReg™ is a member of
AnalogicTech™'s Total Power Management™ IC
product family. The Step-down switching converter
is ideal for applications where high efficiency, small
size, and low ripple are critical. Able to deliver 3A
with an internal power MOSFET, the current-mode
controlled IC provides high efficiency. Fully inter-
nally compensated, the AAT1154 simplifies system
design and lowers external part count.
The AAT1154 is available in an SOP-8 package,
rated over -40 to 85°C.
Features
•V
IN
Range: 2.7-5.5Volts
• Fixed or adjustable V
OUT
: 1.0V - 4.2V
• 3A output current
• Up to 95% efficiency
• Integrated low on resistance power switch
• Internally compensated current mode control
• 1MHz switching frequency
• Constant PWM mode
• Low output ripple with light load
• Internal softstart
• Current limit protection
• Over-Temperature protection
• SOP-8 package
• -40 to 85°C Temperature Range
Applications
• Computer Peripherals
• Set Top Boxes
• Network Cards
• Cable/DSL Modems
• High efficiency conversion from 5V or 3.3V
supply
Typical Application
OUTPUT
INPUT
1.5µH
120µF
LX
VP
FB
GND
AAT1154
V
CC
ENABLE
10µF
0.1µF
100Ω