PRODUCT DATASHEET
AAT2552178
SystemPower
TM
General Description
Total Power Solution for Portable Applications
Features
• Battery Charger:
▪
Input Voltage Range: 4V to 7.5V
▪
Programmable Charging Current up to 500mA
▪
Highly Integrated Battery Charger
• Charging Device
• Reverse Blocking Diode
• Current Sensing
• Step-Down Converter:
▪
Input Voltage Range: 2.7V to 5.5V
▪
Output Voltage Range: 0.6V to V
IN
▪
300mA Output Current
▪
Up to 96% Efficiency
▪
45μA Quiescent Current
▪
1.5MHz Switching Frequency
▪
120μs Start-Up Time
• Linear Regulator:
▪
300mA Output Current
▪
Low Dropout: 400mV at 300mA
▪
Fast Line and Load Transient Response
▪
High Accuracy: ±1.5%
▪
85μA Quiescent Current
• Short-Circuit, Over-Temperature, and Current Limit
Protection
• TDFN34-16 Package
• -40°C to +85°C Temperature Range
The AAT2552 is a fully integrated 500mA battery char-
ger, a 300mA step-down converter, and a 300mA low
dropout (LDO) linear regulator. The input voltage range
is 4V to 7.5V for the battery charger and 2.7V to 5.5V
for the step-down converter and linear regulator, making
it ideal for applications operating with single-cell lithium-
ion/polymer batteries.
The battery charger is a complete constant current/con-
stant voltage linear charger. It offers an integrated pass
device, reverse blocking protection, high accuracy cur-
rent and voltage regulation, charge status, and charge
termination. The charging current is programmable via
external resistor from 30mA to 500mA. In addition to
these standard features, the device offers over-voltage,
current limit, and thermal protection.
The step-down converter is a highly integrated converter
operating at a 1.5MHz switching frequency, minimizing
the size of external components while keeping switching
losses low. The output voltage ranges from 0.6V to the
input voltage.
The AAT2552 linear regulator is designed for high speed
turn-on and turn-off performance, fast transient response,
and good power supply ripple rejection. Delivering up to
300mA of load current, it includes short-circuit protec-
tion and thermal shutdown.
The AAT2552 is available in a Pb-free, thermally-
enhanced TDFN34-16 package and is rated over the
-40°C to +85°C temperature range.
Applications
•
•
•
•
•
•
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Bluetooth™ Headsets
Cellular Phones
GPS
Handheld Instruments
MP3 and Portable Music Players
PDAs and Handheld Computers
Portable Media Players
Typical Application
Adapter/USB Input
Enable
V
OUTB
R
FBB1
C
OUTB
4.7μF
R
FBB2
V
OUTA
R
FBA1
C
OUTA
R
FBA2
FBA
GND
FBB
OUTA
L1
LX
ADP
STAT
EN_BAT
INB
ENB
INA
ENA
AAT2552
MODE
BAT
ISET
System
BATT+
C
OUT
R
SET
Battery
Pack
BATT-
2552.2008.02.1.2
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