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 lithium-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 AAT36981/-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 RDS(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 monitoring 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 regulator 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
11.5mm
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 •
[email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
1
DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
Pin Description
Pin # 1 2 3 4 5 6
7
8 9
10
11
12
13 14 EP
Name INCHR
IN LDOOUT
POK STAT ABO
TERM
GND EN
ISET
IC
NOBAT
ABI BAT
Type I/O I O O O O
I
I I
I
I
I
I O
Function
OVP output switch and battery charger input; decouple to GND with 1μF capacitor. Input from USB port or adapter connector. 5V/50mA LDO output through OVP device; bypass to GND with 1μF capacitor. Power OK flag pin; open drain, active low. Charge status indicator pin; open drain, active low. Auto booting output. Connect the RTERM resistor between the TERM pin and ground to set the charge termination current. When the TERM pin is connected to INCHR, charge current termination level is set to 10% of the programmed fast charge current. Power ground. Enable pin, active low. Internally connected to ground through a 200kΩ pull-down resistor. Connect RSET resistor to this pin to set charging current. Connect a 10kΩ resistor from this pin to the system to monitor this pin's voltage. Internally connected; connect this pin to ground. No battery detection input. If the NOBAT pin is left unconnected, charging is disabled. Internally pulled to LDOOUT pin through a 1.6MΩ pull-up resistor. Auto booting input. Internally connected to ground through a 200kΩ pull-down resistor. Connect to Li-Ion battery. Exposed paddle; connect to ground.
Pin Configuration
TDFN33-14 (Top View)
INCHR 1 IN 2
LDOOUT 3 POK 4 STAT 5 ABO 6
TERM 7
14 BAT 13 ABI 12 NOBAT 11 IC 10 ISET
9 EN 8 GND
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 •
[email protected] • www.skyworksinc.com
2 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012
DATA SHEET
AAT3698
1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package
Absolute Maximum Ratings1
Symbol
VIN VP VN TJ TA TL.