850kHz 1A Synchronous Buck DC/DC Converter
General Description
The AAT1152 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 1A
with internal Power MOSFETs, the current-mode
controlled IC provides high efficiency using syn-
chronous rectification. Fully internally compensat-
ed, the AAT1152 simplifies system design and low-
ers external part count.
The AAT1152 features a Power Good (POK) func-
tion which monitors the output, alerting the system
if the output voltage falls out of regulation.
The AAT1152 is available in MSOP-8 package,
rated over -40 to 85°C.
AAT1152
Features
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SwitchReg
™
5.5V max supply input
Fixed output voltage: 1.1V–4.2V with 100 mV
increment
1A output current
Integrated low on resistance power switches
Synchronous rectification
Up to 95% efficiency
Power Good signal
Internally compensated current mode control
High initial accuracy: ±1%
850kHz switching frequency
Constant PWM mode
Low output ripple with light load
Internal softstart
Current limit protection
Over-Temperature protection
MSOP-8 package
Preliminary Information
Applications
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Computer Peripherals
Set Top Boxes
Network Cards
Cable/DSL Modems
High efficiency conversion from 5V or 3.3V
supply
Typical Application
INPUT
100k
10µF
V
P
AAT1152
POK
FB
4.1µH
LX
ENABLE
100Ω
V
CC
OUTPUT
SGND
0.1µF
P
GND
47µF
1152.2003.01.0.9
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ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
