AAT2550_08 ANALOGICTECH [Advanced Analogic Technologies], AAT2550_08 Datasheet - Page 13

• Manufacturer Part Number: AAT2550_08
• Description: Total Power Solution for Portable Applications
• Manufacturer: ANALOGICTECH [Advanced Analogic Technologies]

Functional Block Diagram
Functional Description
The AAT2550 is a highly integrated power management
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 block-
ing, 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 minimize external component size and maximize effi-
ciency over the entire load range. Each converter has
independent enable and input voltage pins and can pro-
vide 600mA of load current.
SystemPower
SystemPower
2550.2008.02.1.3
2550.2008.02.1.3
ADPSET
ENBAT
STAT2
STAT1
ENB
ENA
ADP
FBA
FBB
CT
TM
TM
Reference
Reference
Voltage
Voltage
4.2V
Amp.
Amp.
Err.
Err.
Charge
Status
Control
Control
Logic
Logic
w w w . a n a l o g i c t e c h . c o m
w w w . a n a l o g i c t e c h . c o m
Constant
Compare
Current
Current
Watchdog
Timer
Total Power Solution for Portable Applications
Total Power Solution for Portable Applications
Battery Charger
The battery charger is designed to operate with standard
AC adapter input sources, while requiring a minimum
number of external components. It precisely regulates
charge voltage and current for single-cell lithium-ion /
polymer batteries.
The adapter charge input constant current level may be
programmed up to 1A for rapid charging applications.
The battery charger features thermal loop charge reduc-
tion. In the event of operating ambient temperatures
exceeding the power dissipation abilities of the device
package for a given constant current charge level, the
Charge
Control
Reverse Blocking
Logic
Logic
Window
Comparator
OTP
DH
DH
DL
DL
UVLO
CV/Pre-
Charge
80μA
PRODUCT DATASHEET
PRODUCT DATASHEET
AAT2550178
AAT2550178
BAT
TS
INA
PGND
PGND
LXA
INB
LXB
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