AAT2552 Datasheet, PDF (1/33 Pages) Advanced Analogic Technologies – Total Power Solution for Portable Applications

AAT2552
Total Power Solution for Portable Applications
General Description
Features
SystemPower^™
The AAT2552 is a fully integrated 500mA battery
charger, a 300mA step-down converter, and a
300mA low dropout (LDO) linear regulator. The
input voltage range is 4V to 6.5V for the battery
charger and 2.7V to 5.5V for the step-down con-
verter and linear regulator, making it ideal for appli-
cations operating with single-cell lithium-ion/poly-
mer batteries.
The battery charger is a complete constant cur-
rent/constant voltage linear charger. It offers an
integrated pass device, reverse blocking protec-
tion, high accuracy current and voltage regulation,
charge status, and charge termination. The charg-
ing current is programmable via external resistor
from 30mA to 500mA. In addition to these stan-
dard features, the device offers over-voltage, cur-
rent limit, and thermal protection.
The step-down converter is a highly integrated
converter operating at a 1.5MHz switching fre-
quency, minimizing the size of external compo-
nents while keeping switching losses low. The out-
put 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 tran-
sient response, and good power supply ripple
rejection. Delivering up to 300mA of load current,
it includes short-circuit protection 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.
Typical Application
• Battery Charger:
— Input Voltage Range: 4V to 6.5V
— 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
Applications
• Bluetooth^® Headsets
• Cellular Phones
• GPS
• Handheld Instruments
• MP3 and Portable Music Players
• PDAs and Handheld Computers
• Portable Media Players
Adapter/USB Input
Enable
V_OUTB
C_OUTB
4.7μF
R_FBB1
R_FBB2
V_OUTA
C_OUTA
ADP
INB
STAT
ENB
EN_BAT
INA
L1
ENA
LX _AAT2552
R_FBA1
R_FBA2
FBB
OUTA
FBA
GND
MODE
BAT
ISET
C_OUT
R _SET
BATT+
BATT-
Battery
Pack
2552.2007.04.1.0
1