1MHz 3A Step-Down DC/DC Converter
General Description
The AAT1154 SwitchReg is a step-down switching
converter ideal for applications where high efficien-
cy, small size, and low ripple are critical. Able to
deliver 3A with an internal power MOSFET, the cur-
rent-mode controlled IC provides high efficiency.
Fully internally compensated, the AAT1154 simpli-
fies system design and lowers external parts count.
The AAT1154 is available in a Pb-free SOP-8 pack-
age and is rated over the -40°C to +85°C tempera-
ture range.
AAT1154
Features
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SwitchReg
™
V
IN
Range: 2.7V to 5.5V
Fixed or Adjustable V
OUT
: 1.0V to 4.2V
3A Output Current
Up to 95% Efficiency
Integrated Low On Resistance Power Switch
Internally Compensated Current Mode Control
1MHz Switching Frequency
Constant Pulse Width Modulation (PWM)
Mode
Low Output Ripple With Light Load
Internal Soft Start
Current Limit Protection
Over-Temperature Protection
SOP-8 Package
-40°C to +85°C Temperature Range
Applications
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Cable/DSL Modems
Computer Peripherals
High Efficiency Conversion from 5V or 3.3V
Supply
Network Cards
Set-Top Boxes
Typical Application
INPUT
VP
FB
10μF
100Ω
AAT1154
VCC
LX
1.5μH
EN
0.1μF
GND
120μF
OUTPUT
1154.2006.09.1.6
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ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
