AAT2557 AnalogicTech, AAT2557 Datasheet - Page 2

• Manufacturer Part Number: AAT2557
• Description: 500mA Battery Charger and 300mA LDO Regulator for Portable Systems
• Manufacturer: AnalogicTech

Pin Descriptions
Pin Configuration
2
2, 8, 12, 13, 14
Pin #
10
11
1
3
4
5
6
7
9
OUTLDO
Symbol
EN_BAT
ENLDO
INLDO
STAT
GND
ISET
ADP
BYP
BAT
Function
Enable pin for the linear regulator. When connected to logic low, the regulator is dis-
abled and consumes less than 1µA of current. When connected to logic high, it
resumes normal operation.
Ground.
Low noise bypass pin. Connect a 10nF capacitor between this pin and ground to
improve AC ripple rejection and reduce noise.
Enable pin for the battery charger. When connected to logic low, the battery charger
is disabled and consumes less than 1µA of current. When connected to logic high,
the charger resumes normal operation.
Charge current set point. Connect a resistor from this pin to ground. Refer to typical
characteristics curves for resistor selection.
Battery charging and sensing.
Input for USB/adapter charger.
Charge status input. Open drain status output.
Linear regulator output. Connect a 2.2µF capacitor from this pin to ground.
Linear regulator input voltage. Connect a 1µF or greater capacitor from this pin to
ground.
EN_BAT
ENLDO
GND
ISET
ADP
BYP
BAT
1
2
3
5
6
7
4
TSOPJW-14
(Top View)
LDO Regulator for Portable Systems
500mA Battery Charger and 300mA
14
13
12
11
10
9
8
GND
GND
GND
INLDO
OUTLDO
STAT
GND
AAT2557
2557.2007.06.1.0