850kHz 1A Buck DC/DC Converter
General Description
The AAT1152 SwitchReg is a step-down switching
converter ideal for applications where high efficien-
cy, small size, and low ripple are critical. Able to
deliver 1A with internal power MOSFETs, the cur-
rent mode controlled IC is internally compensated
for simplified system design and low external parts
count.
The AAT1152 features a Power-OK (POK) function
which monitors the output, alerting the system if
the output voltage falls out of regulation.
The AAT1152 is available in a Pb-free MSOP-8
package and is rated over the -40°C to +85°C tem-
perature range.
AAT1152
Features
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SwitchReg
™
5.5V Max Supply Input
Fixed or Adjustable V
OUT
1.0V to 4.2V
1A Output Current
Integrated Low On Resistance Power Switches
Up to 95% Efficiency
Power-OK Signal
Internally Compensated Current Mode Control
High Initial Accuracy: ±1%
850kHz Switching Frequency
Constant Pulse Width Modulation (PWM)
Mode
Low Output Ripple with Light Load
Internal Soft Start
Current Limit Protection
Over-Temperature Protection
MSOP-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
100k
10μF
VP
AAT1152
POK
FB
4.1μH
LX
ENABLE
100Ω
VCC
SGND
0.1μF
PGND
3 x 22μF
OUTPUT
1152.2006.09.1.7
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ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
