AAT3698 Datasheet, PDF (1/21 Pages) Skyworks Solutions Inc. – 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package

DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
General Description
The AAT3698-1/-2 BatteryManager™ is a single-cell lithi-
um-ion (Li-Ion)/Li-Polymer battery charger IC designed
to operate from a USB port or AC adapter with an input
voltage of up to 7.0V. For increased safety, the AAT3698-
1/-2 also includes over-voltage input protection (OVP)
up to 28V.
The AAT3698-1/-2 precisely regulates battery voltage
for 4.2V Li-Ion/Polymer battery cells through a low
R_DS(ON) switch. The charging current can be set by an
external resistor up to 1.6A. If an over-voltage condition
occurs from the input, the series switch quickly opens
and a fault flag is activated, preventing damage to the
battery and the charging circuitry.
Other fault conditions are monitored in real time. In case
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-
ing output pin (STAT) is provided to indicate charging
activity. This open drain output pin can be used to drive
an external LED as a charging indicator.
The AAT3698-1/-2 also includes a 5.0V LDO linear regu-
lator with over-voltage protection that can supply loads
of up to 50mA.
The AAT3698-1/-2 is available in the Pb-free, thermally
enhanced, space-saving 3x3mm TDFN33-14 package and
is rated over the -40°C to +85°C temperature range.
Typical Application
Features
• USB or AC Adapter System Power Charger
• 3.0V ~ 7.0V Input Voltage Range
• Fast Over-Voltage Protection Turn Off
• OVP Trip Threshold: 7.25V (typ)
• High Level of Integration with Internal:
▪ Power Device
▪ Reverse Current Blocking
▪ Current Sensing
• 5V/50mA LDO Output
• Programmable Fast Charge Current from 50mA to
1.6A
• Programmable Charge Termination Current
• Charge Status Indicator
• Power OK Indicator
• Battery Absence Detection Input Pin
• Automatic Termination and Recharge Sequencing
(AAT3698-1 Only)
• Automatic Trickle Charge For Battery Pre-Conditioning
• Emergency Thermal Shutdown Protection
• Digitally Controlled Thermal Loop Regulation
• Active Low Enable with Internal 200kΩ Pull-Down
Resistor
• Output for Auto-Booting
• 14-pin 3x3mm TDFN Package
Applications
• Bluetooth™ Headsets, Headphones, Accessories
• Digital Still Cameras
• Mobile Telephones
• Personal Data Assistants (PDAs)
• MP3 Players
• Other Lithium-Ion/Polymer Battery-Powered Devices
VIN
C₁
1μF
C₂
1μF
ON/OFF
5V
R₁ R₂
IN
NOBAT
INCHR
BAT
C₄
ABI _1μF
ABO
EN _AAT3698-x ^IC
LDOOUT
C₃
1μF
Battery Pack
LDOOUT
STAT
POK
ISET
TERM
GND
R₃
R₄
10.9mm
U1
C1
C2, C3
C4
R1
R2
R3
R4
AAT3698-x
GRM31MR71H105KA88
GRM188R61A225KE34
GRM21BR71C105KA01L
1.5kΩ, 5%, 1/4W, 0603
1.5kΩ, 5%, 1/4W, 0603
13.3kΩ, 1%, 1/4W, 0603
1.58kΩ, 1%, 1/4W, 0603
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
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