AAT2550 Datasheet, PDF (13/35 Pages) Advanced Analogic Technologies – Total Power Solution for Portable Applications

AAT2550
Total Power Solution for Portable Applications
Functional Block Diagram
ADP
ADPSET
ENBAT
STAT2
STAT1
CT
FBA
ENA
FBB
ENB
Reverse Blocking
4.2V
Charge
Status
Current
Compare
Constant
Current
Watchdog
Timer
OTP UVLO
Charge
Control
CV/Pre-
Charge
Window
Comparator
80µA
Err.
Amp.
Voltage
Reference
Control
Logic
DH
Logic
DL
Err.
Amp.
Voltage
Reference
Control
Logic
DH
Logic
DL
BAT
TS
INA
LXA
PGND
INB
LXB
PGND
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
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.
2550.2006.07.1.0
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