AAT2556 Datasheet, PDF (1/27 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
General Description
The AAT2556 is a member of Skyworks' Total Power
Management IC (TPMIC™) product family. It is a fully
integrated 500mA battery charger plus a 250mA step-
down converter. The input voltage range is 4V to 6.5V for
the battery charger and 2.7V to 5.5V for the step-down
converter, making it ideal for single-cell lithium-ion/poly-
mer battery-powered applications.
The battery charger is a complete constant current/ con-
stant voltage linear charger. It offers an integrated pass
device, reverse blocking protection, high current accu-
racy and voltage regulation, charge status, and charge
termination. The charging current is programmable via
external resistor from 15mA to 500mA. In addition to
standard features, the device offers over-voltage, cur-
rent limit, and thermal protection.
The step-down converter is a highly integrated converter
operating at 1.5MHz of switching frequency, minimizing
the size of external components while keeping switching
losses low. It has independent input and enable pins.
The output voltage ranges from 0.6V to the input volt-
age. The feedback and control deliver excellent load
regulation and transient response with a small output
inductor and capacitor.
The AAT2556 is available in a Pb-free, thermally-
enhanced TDFN33-12 package and is rated over the
-40°C to +85°C temperature range.
Features
• Battery Charger:
▪ Input Voltage Range: 4V to 6.5V
▪ Programmable Charging Current up to 500mA
▪ Highly Integrated Battery Charger
▪ Charging Device
▪ Reverse Blocking Diode
• Step-Down Converter:
▪ Input Voltage Range: 2.7V to 5.5V
▪ Output Voltage Range: 0.6V to VIN
▪ 250mA Output Current
▪ ^{Up to 96% Efficiency}
▪ 30μA Quiescent Current
▪ ^{1.5MHz Switching Frequency}
▪ 100μs Start-Up Time
• Short-Circuit, Over-Temperature, and Current Limit
Protection
• TDFN33-12 Package
• -40°C to +85°C Temperature Range
Applications
• Bluetooth™ Headsets
• Cellular Phones
• Handheld Instruments
• MP3 and Portable Music Players
• PDAs and Handheld Computers
• Portable Media Players
Typical Application
Adapter / USB Input
ADP
VIN
Enable
V_OUT
C_OUT
STAT
EN_BUCK
L= 3.3μH
R_FB1
R_FB2
EN_BAT
BAT
LX
ISET
FB
GND
RSET
BATT +
C
BATT -
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
202177B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013
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