AAT2556 Datasheet, PDF (2/27 Pages) Advanced Analogic Technologies – Battery Charger and Step-Down Converter for Portable Applications

DATA SHEET
AAT2556
Battery Charger and Step-Down Converter for Portable Applications
Pin Descriptions
Pin #
1
2, 8, 10
3
4
5
6
7
9
11
12
EP
Symbol
FB
GND
EN_BUCK
EN_BAT
ISET
BAT
STAT
ADP
LX
VIN
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 con-
sumes 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
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
2
202177B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013