DATA SHEET
AAT2554
Total Power Solution for Portable Applications
Features
General Description
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The AAT2554 is a fully integrated 500mA battery char-
ger, a 250mA step-down converter, and a 300mA low
dropout (LDO) linear regulator. The input voltage range
is 4V to 6.5V for the battery charger and 2.7V to 5.5V
for the step-down converter and linear regulator, making
it ideal for applications operating with single-cell lithium-
ion/polymer batteries.
Battery Charger:
Input Voltage Range: 4V to 6.5V
Programmable Charging Current up to 500mA
Highly Integrated Battery Charger
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Charging Device
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Reverse Blocking Diode
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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
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The battery charger is a complete constant current/con-
stant voltage linear charger. It offers an integrated pass
device, reverse blocking protection, high accuracy cur-
rent and voltage regulation, charge status, and charge
termination. The charging current is programmable via
external resistor from 15mA to 500mA. In addition to
these standard features, the device offers over-voltage,
current limit, and thermal protection.
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Linear Regulator:
300mA Output Current
Low Dropout: 400mV at 300mA
Fast Line and Load Transient Response
High Accuracy: ±1.5%
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The step-down converter is a highly integrated converter
operating at a 1.5MHz 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 voltage.
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70μA Quiescent Current
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Short-Circuit, Over-Temperature, and Current Limit
Protection
TDFN34-16 Package
The AAT2554 linear regulator is designed for fast tran-
sient response and good power supply ripple rejection.
Designed for 300mA of load current, it includes short-
circuit protection and thermal shutdown.
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-40°C to +85°C Temperature Range
Applications
• Bluetooth™ Headsets
The AAT2554 is available in a Pb-free, thermally-
enhanced TDFN34-16 package and is rated over the
-40°C to +85°C temperature range.
• Cellular Phones
• Handheld Instruments
• MP3 and Portable Music Players
• PDAs and Handheld Computers
• Portable Media Players
Typical Application
Adapter/USB Input
VINB
ADP
ENB
VINA
STAT
EN_BAT
Enable
ENA
VOUTB
L= 3.0μH
AAT2554
BATT+
LX
BAT
RFB1
RFB2
FB
COUTB
COUT
VOUTA
OUTA
ISET
BATT-
RSET
COUTA
GND
Battery
Pack
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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202176B
• Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013