AAT2554
Total Power Solution for Portable Applications
Pin Descriptions
Pin #
Symbol
Function
1
FB
Feedback input. This pin must be connected directly to an external resistor divider.
Nominal voltage is 0.6V.
2, 10, 12, 14
3
GND
ENB
Ground.
Enable pin for the step-down converter. When connected to logic low, the step-down
converter is disabled and consumes less than 1µA of current. When connected to
logic high, the converter resumes normal operation.
4
VINA
Linear regulator input voltage. Connect a 1µF or greater capacitor from this pin to
ground.
5
6
OUTA
Linear regulator output. Connect a 2.2µF capacitor from this pin to ground.
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.
EN_BAT
7
ISET
Charge current set point. Connect a resistor from this pin to ground. Refer to typical
characteristics curves for resistor selection.
8
9
BAT
STAT
ADP
ENA
Battery charging and sensing.
Charge status input. Open drain status output.
11
13
Input for USB/adapter charger.
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.
15
LX
Output of the step-down converter. Connect the inductor to this pin. Internally, it is
connected to the drain of both high- and low-side MOSFETs.
Input voltage for the step-down converter.
16
VINB
EP
Exposed paddle (bottom): connect to ground directly beneath the package.
Pin Configuration
TDFN34-16
(Top View)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VINB
LX
FB
GND
ENB
GND
ENA
GND
ADP
GND
STAT
VINA
OUTA
EN_BAT
ISET
BAT
2
2554.2007.01.1.2
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
