SwitchReg
™
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
Preliminary Information
1152.2003.01.0.9 1
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.
Features
• 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
Applications
• Computer Peripherals
• Set Top Boxes
• Network Cards
• Cable/DSL Modems
• High efficiency conversion from 5V or 3.3V
supply
Typical Application
OUTPUT
4.1µH
47µF
10µF
0.1µF
100Ω
LX
100k
VP
INPUT
FB
SGND
AAT1152
ENABLE
POK
V
CC
PGND