AAT2550
Total Power Solution for Portable Applications
Functional Block Diagram
Reverse Blocking
BAT
ADP
Current
Compare
ADPSET
UVLO
OTP
4.2V
Constant
Current
Charge
Control
ENBAT
CV/Pre-
Charge
STAT2
Charge
Status
STAT1
TS
Watchdog
Timer
80µA
Window
CT
Comparator
INA
FBA
Err.
Amp.
DH
DL
LXA
Logic
Voltage
Reference
Control
Logic
ENA
PGND
INB
FBB
Err.
Amp.
DH
DL
LXB
Logic
Voltage
Reference
Control
Logic
ENB
PGND
device and reverse blocking, it offers a constant
current / constant voltage charge algorithm with a
user-programmable charge current level. The two
step-down converters have been designed to mini-
mize external component size and maximize effi-
ciency over the entire load range. Each converter
has independent enable and input voltage pins and
can provide 600mA of load current.
Functional Description
The AAT2550 is a highly integrated power manage-
ment IC comprised of a battery charger and two
step-down voltage converters. The battery charger
is designed for charging single-cell lithium-ion /
polymer batteries. Featuring an integrated pass
2550.2006.07.1.0
13
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
