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AAT3783
BatteryManagerTM 1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection
General Description
Features
The AAT3783 BatteryManager™ is a single-cell Lithium-
Ion (Li-Ion)/Li-Polymer battery charger IC, designed to
operate from USB ports, AC adapter inputs, or from a
charger adapter up to an input voltage of 6.5V. For
increased safety, the AAT3783 also includes over-voltage
input protection (OVP) up to 28V.
• USB or AC Adapter System Power Charger
• Programmable from 100mA to 1A Max
• 4.0V ~ 7.5V Input Voltage Range
Over-Voltage Input Protection up to 28V
• High Level of Integration with Internal:
▪
Charging Device
Reverse Blocking Diode
Current Sensing
▪
▪
The AAT3783 precisely regulates battery charge voltage
and current for 4.2V Li-Ion/Polymer battery cells through
an extremely low RDS(ON) switch. When charged from an
adapter or a USB port, the battery charging current can
be set by an external resistor up to 1A. In the case of an
over-voltage condition in excess of 6.5V, a series switch
opens preventing damage to the battery and charging
circuitry. With the addition of an external resistor the
OVP trip point can be programmed to a level other than
the factory set value of 6.5V. In the case of an OVP con-
dition a fault flag is activated.
▪
• Digital Thermal Regulation
• Charge Current Programming (ISET)
• Charge Termination Current Programming (TERM)
• Charge Timer (CT)
• Battery Temperature Sensing (TS)
• TS Pin Open Detection
• Automatic Recharge Sequencing
• No Trickle Charge Option Available
• Full Battery Charge Auto Turn Off / Sleep State /
Charge Termination
Battery charge state is continuously monitored for fault
conditions. In the event of an over-current, battery over-
voltage, short-circuit or over-temperature failure, the
device will automatically shut down, thus protecting the
charging device, control system and the battery under
charge. A status monitor output pin is provided to indi-
cate the battery charge status by directly driving an exter-
nal LED. An open-drain power-source detection output
(ADPP) is provided to report the power supply status.
• Automatic Trickle Charge for Battery Pre-conditioning
• Battery Over-Voltage and Over-Current Protection
•
Emergency Thermal Protection
• Power On Reset
• 16-pin 3x4mm TDFN Package
Applications
• Bluetooth™ Headsets, Headphones, Accessories
• Digital Still Cameras
• Mobile Phones
• MP3 Players
The AAT3783 comes in a thermally enhanced, space-
saving, Pb-free 16-pin 3x4 mm TDFN package and is
specified for operation over the -40°C to +85°C tem-
perature range.
• Personal Data Assistants (PDAs)
• Other Li-Ion/Polymer Battery Powered Devices
Typical Application
VIN
IN
IN
BATS
BATT+
BAT
10μF
AAT3783
FLT
OVP
BATT-
TEMP
INCHR
TS
CT
2.2μF
Battery
Pack
STAT
TERM
ISET
ADPP
ENCHR
Enable Charging
Enable OVP
CT
RSET
RTERM
ENOVP
GND
w w w . a n a l o g i c t e c h . c o m
3783.2007.12.1.0
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