AAT3692 Datasheet, PDF (1/19 Pages) Skyworks Solutions Inc. – Dual Input 1.6A Linear Charger with 28V OVP in a 3x4 TDFN Package

DATA SHEET
AAT3692
Dual Input 1.6A Linear Charger with 28V OVP in a 3x4 TDFN Package
General Description
The AAT3692 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
7.2V typical. For increased safety, the AAT3692 also
includes over-voltage input protection (OVP) up to 28V.
The AAT3692 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; the percentage of the termination
charging current is programmable by an external resistor
on the R_TERM pin. In the case of an over-voltage condition
of ADP or USB input power exceeding typical 7.2V, the
internal series switch opens, blocking the damage to the
battery and charging circuitry.
The AAT3692 also includes a no-battery present input
(NOBAT). When NOBAT indicates that no battery is pres-
ent, the charging function will be suspended while OVP
is still active.
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
suspend charging, protecting the charging device, control
system and battery, until the fault condition is removed.
An open drain POK pin indicates the valid input of AC
adapter or USB power; an open drain status monitor
output pin (STAT) is adopted to report battery charging
activity by active low.
The AAT3692 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.
Typical Application
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 ~ 7.2V (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
• Automatic Charge Reduction
• Programmable Charge Termination Current
Percentage
• Fast Over-Voltage Protection Turn Off and Release
Turn On Time
• Full Battery Charge Auto Turn Off/Sleep Mode/Charge
Termination
• Charge Status Indicator
• Input Power Good Indicator
• 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
USBIN
1μF
Voltage
Source
2.2μF
R1
R2
ADPIN
1μF
2.2μF
USB
BAT
USBCH
AAT3692
STAT
POK
ADP
ADPCH
NOBAT
EN
USBSET
ADPSET
TERM
GND
10μF
BATT+
BATT-
Battery
Pack
NOBAT
ON/OFF
R_TERM
R_ADPSET
R_USBSET
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
201895B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 270, 2012
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