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| AAT2556 Datasheet, PDF (2/29 Pages) Advanced Analogic Technologies – Battery Charger and Step-Down Converter for Portable Applications | |||
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AAT2556
Battery Charger and Step-Down
Converter for Portable Applications
Pin Descriptions
Pin #
1
Symbol
FB
2, 8, 10
3
GND
EN_BUCK
4
EN_BAT
5
ISET
6
BAT
7
STAT
9
ADP
11
LX
12
VIN
EP
Function
Feedback input. This pin must be connected directly to an external resistor divider.
Nominal voltage is 0.6V.
Ground.
Enable pin for the step-down converter. When connected to logic low, the step-down
converter is disabled and it consumes less than 1µA of current. When connected to
logic high, it resumes normal operation.
Enable pin for the battery charger. When internally pulled down, the battery charger is
disabled and it consumes less than 1µA of current. When connected to logic high, it
resumes normal operation.
Charge current set point. Connect a resistor from this pin to ground. Refer to typical
curves for resistor selection.
Battery charging and sensing.
Charge status input. Open drain status input.
Input for USB/adapter charger.
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.
Exposed paddle (bottom): connect to ground directly beneath the package.
Pin Configuration
TDFN33-12
(Top View)
FB 1
GND 2
EN_BUCK 3
EN_BAT 4
ISET 5
BAT 6
12 VIN
11 LX
10 GND
9 ADP
8 GND
7 STAT
2
2556.2006.09.1.2
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