AAT3691 Datasheet, PDF (1/18 Pages) Skyworks Solutions Inc. – Dual Input 1.6A Linear Charger with 28V OVP in a 3x4 TDFN Package

DATA SHEET
AAT3691
Dual Input 1.6A Linear Charger with 28V OVP in a 3x4 TDFN Package
General Description
The AAT3691 BatteryManager™ is an integrated single
cell Lithium-Ion (Li-Ion) battery charger IC, designed to
operate from USB ports, AC adapter inputs, or from a
cellular phone charger adapter up to an input voltage of
typical 6.75V. For increased safety, The AAT3691 also
includes over-voltage input protection (OVP) up to 28V.
The AAT3691 precisely regulates battery charge voltage
and current for 4.2V Li-Ion battery cells. The charge
current can be programmed up to 1.6A for ADP charging
and 0.5A for USB charging by external resistors on the
ADPSET/USBSET pins. In the case of an over-voltage
condition of ADP or USB input power exceeding typical
6.75V, the internal series switch opens, blocking the
damage to the battery and charging circuitry.
The AAT3691 also includes a no-battery present input
(NOBAT). When the NOBAT indicates that no battery is
present, OVP block will prevent the input power from
passing through the OVP block and suspend the charging
function.
Battery charging status is continuously monitored for
fault conditions. In the event of a battery over voltage or
chip over thermal failure, the charger will automatically
shutdown, protecting the charging device, control system
and battery, until the fault condition is removed. The
open drain status monitor output pin (STAT) is adopted
to report battery charging activity by active low.
The AAT3691 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 tempera-
ture range.
Features
• Dual Input USB and AC Adapter Input
▪ Programmable Constant Current from 100mA to
1.6A for ADP Charge
▪ Programmable Constant Current from 50mA to 0.5A
for USB Charge
• No Battery Present Input Detection
• 3.0V ~ 6.75V (typical) Input Voltage Range
• Over-Voltage Input Protection up to 28V
• High Level of Integration with Internal:
▪ Power Device
▪ ^{Reverse Current Blocking}
▪ Current Sensing
• Automatic Recharge Sequencing
• Fast Over-Voltage Protection Turn Off and Release
Turn On Time
• Full Battery Charge Auto Turn Off/Sleep Mode/Charge
Termination
• Charge Status Indicator
• Automatic Charge Reduction
• Automatic Trickle Charge for Battery Preconditioning
• Thermal Shutdown Protection
• Active Digital Thermal Loop Control
• Power On Reset and Soft Start
• Active Low Enable with Internal 200kΩ Resistor Pull-
Down to GND
• 3x4mm TDFN Package
Applications
• Digital Still Cameras
• Mobile Phones
• Personal Data Assistants (PDAs)
• Other Li-Ion Battery Powered Devices
Typical Application
USBIN
1μF
2.2μF
Voltage
Source
ADPIN
1μF
R
2.2μF
USB
BAT
USBCH
IC
AAT3691
NOBAT
STAT
EN
ADP
USBSET
ADPCH _ADPSET
GND
10μF
Battery
BATT+ ^Pack
BATT-
NOBAT
ON/OFF
RADPSET
RUSBSET
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
201894B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
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