AAT2557
500mA Battery Charger and 300mA
LDO Regulator for Portable Systems
General Description
The AAT2557 is a fully integrated 500mA battery
charger 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 linear
regulator, making it ideal for applications operating
with single-cell lithium-ion/polymer 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 15mA to 500mA. In addition to these stan-
dard features, the device offers over-voltage, cur-
rent limit, and thermal protection.
The linear regulator is designed for fast transient
response and good power supply ripple rejection.
Capable of up to 300mA load current, it includes
short-circuit protection and thermal shutdown.
The AAT2557 is available in a Pb-free, thermally-
enhanced TSOPJW-14 package and is rated over
the -40°C to +85°C temperature range.
Features
•
SystemPower
™
•
•
•
•
Battery Charger:
— Input Voltage Range: 4V to 6.5V
— Programmable Charging Current up to
500mA
— Highly Integrated Battery Charger
• Charging Device
• Reverse Blocking Diode
Linear Regulator:
— 300mA Output Current
— Low Dropout: 400mV at 300mA
— Fast Line and Load Transient Response
— High Accuracy: ±1.5%
— 70µA Quiescent Current
Short-Circuit, Over-Temperature, and Current
Limit Protection
TSOPJW-14 Package
-40°C to +85°C Temperature Range
Applications
•
•
•
•
•
•
Bluetooth
®
Headsets
Cellular and DECT Phones
Handheld Instruments
MP3 and Portable Music Players
PDAs and Handheld Computers
Portable Media Players
Typical Application
Adapter/USB Input
ADP
STAT
INLDO
C
INLDO
Charger Enable
LDO Enable
V
OUTLDO
EN_BAT
System
AAT2557
ENLDO
OUTLDO
C
OUTLDO
BYP
C
BYP
GND
ISET
BAT
BATT+
C
BAT
BATT-
R
SET
Battery
Pack
2557.2007.06.1.0
1
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
