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AAT3686 Schematic ( PDF Datasheet ) - AAT

Teilenummer AAT3686
Beschreibung USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger
Hersteller AAT
Logo AAT Logo 




Gesamt 24 Seiten
AAT3686 Datasheet, Funktion
AAT3686
USB Port/AC Adapter
Lithium-Ion/Polymer Battery Charger
General Description
BatteryManager
Features
The AAT3686 BatteryManager is a highly integrated
• USB Port/AC Adapter System Power Charger
single-cell lithium-ion/polymer battery charger IC
— USB: Programmable to 500mA for
designed to operate with USB port and AC adapter
USB Hi/Lo
inputs. It requires the minimum number of external
— Adapter: Programmable to 1.5A Max
components.
• 4.0V to 5.5V Input Voltage Range
The AAT3686 precisely regulates battery charge
voltage and current for 4.2V lithium-ion/polymer
battery cells. Adapter charge current rates can be
programmed up to 1.5A. In the absence of an
adapter and with a USB port connected, the battery
can also be charged by USB power. Depending on
the USB port type, the AAT3686 charge current can
be programmed for two separate levels up to
500mA. An optional Charge Reduction Loop is also
built in to allow users to charge the battery with
available current from a USB port, while keeping
the port voltage regulated. USB charging is dis-
abled when an adapter is present.
Battery temperature and charge state are fully moni-
tored for fault conditions. In the event of an over-volt-
age or over-temperature failure, the device will auto-
matically shut down, thus protecting the charging
• Adapter Present Indicator (ADPP# Pin)
• Adapter Presence Automatically Disables
USB Charging
• High Level of Integration With Internal:
— Charging Devices
— Reverse Blocking Diodes
— Current Sensing
• Automatic Recharge Sequencing
• Digital Thermal Regulation in ADP Charge
• Charge Reduction Loop in USB Charge
• Battery Temperature Monitoring
• Full Battery Charge Auto Turn-Off
• Over-Voltage and Emergency Thermal
Protection
• Power On Reset and Soft Start
• Serial Interface Status Reporting
• TDFN34-16 or TDFN44-16 Package
device, control system, and the battery under charge.www.DataSheet4U.com
Status monitor output pins are provided to indicate
the battery charge status by directly driving two exter-
nal LEDs. A serial interface output is available to
Applications
report 22 various status states to a microcontroller.
The AAT3686 is available in a Pb-free, thermally-
enhanced, space-saving TDFN34-16 (3x4mm) or
TDFN44-16 (4x4mm) package and is rated over the
-40°C to +85°C temperature range.
Typical Application
• Cellular Telephones
• Digital Still Cameras
• Hand-Held PCs
• MP3 Players
• Personal Data Assistants (PDAs)
• Other Lithium-Ion/Polymer Battery-Powered
Devices
Enable
USB Input
USB Hi/Lo Select
RSETH
ADP Present
ADP Input
USB EN
USBSEL
USBH
CHR
BAT
USBL
TS
RSETL
AAT3686 CT
ADPP#
ADP
ADPSET
RSET STAT1
GND
DATA
STAT2
CT
BATT+
C2
10μF
BATT-
TEMP
Battery Pack
Serial Data
3686.2006.10.1.9
1






AAT3686 Datasheet, Funktion
Typical Characteristics
IFASTCHARGE vs. RSET
10000
1000
100
10
1
USBL
USBH
ADP
10
RSET (kΩ)
AAT3686
USB Port/AC Adapter
Lithium-Ion/Polymer Battery Charger
Battery Voltage vs. Supply Voltage
4.242
4.221
4.200
4.179
USBH
ADP
4.158
100 4.5 4.75 5.0 5.25 5.5
Supply Voltage (V)
Recharge Voltage vs. Temperature
4.140
4.130
4.120
4.110
4.100
ADP
4.090
4.080 USBH
4.070
4.060
4.050
4.040
-50
-25
0
25 50 75 100
Temperature (°C)
End of Charge Voltage vs. Temperature
4.242
4.221
4.200
4.179
ADP
USBH
4.158
-50
-25
0 25 50
Temperature (°C)
75 100
Preconditioning Threshold
Voltage vs. Temperature
3.05
3.04
3.03
3.02
3.01
USBH
3.00
2.99
2.98 ADP
2.97
2.96
2.95
-50
-25
0
25 50 75
Temperature (°C)
100
Preconditioning Charge Current vs. Temperature
(ADPSET = 8.06kΩ; USBH = 8.06kΩ)
120 60
110
ADP
100
USBH
90
55
50
45
80
-50
-25
0 25 50
Temperature (°C)
75
40
100
6 3686.2006.10.1.9

6 Page









AAT3686 pdf, datenblatt
AAT3686
USB Port/AC Adapter
Lithium-Ion/Polymer Battery Charger
When the input supply is disconnected or drops
below UVLO or EN = 0, the charger will automati-
cally enter power-saving sleep mode. Consuming
an ultra-low 0.3µA in sleep mode (1µA for
AAT3686-1), the AAT3686 minimizes battery drain
when it is not charging. This feature is particularly
System Operation Flow Chart
useful in applications where the input supply level
may fall below the battery charge or under-voltage
lockout level. In such cases where the AAT3686
input voltage drops, the device will enter sleep
mode and automatically resume charging once the
input supply has recovered from its fault condition.
Output
ADPP
Yes
ADP
Voltage Test
ADP > VADPP
No
ADP
Loop
ADP
Power Select
USB
Yes
UVLO
VP > VUVLO
Yes Switch
On
No
No Sleep
Mode
Enable
Power On
Reset
USB Low
Current Loop
0
USB Detect
USBSEL = ?
Thermal
Loop Enable
USB High
Current Loop
1
Fault
Conditions Monitor
OV, OT
Yes
Yes No
Shutdown
Mode
Battery
Temp. Monitor
VTS1 < TS < VTS2
No Battery
Temp. Fault
Timing
Expire
No
Device Temp. Monitor
TJ > 110°C
Yes
Thermal Loop
Current
Reduction in ADP
Charging Mode
Charge
Safety
TiTmimerer
No Yes Yes Low Current
Recharge Test
Preconditioning Test
Conditioning
VRCH > VBAT
VMIN > VBAT
Charge
Set
No
Current Phase Test
VEOC > VBAT
Yes
Current
Charging
Mode
No
Voltage Phase Test
IBAT > ITERM
Yes
Voltage
Charging
Mode
No
Charge
Completed
USB Voltage
Regulation
Enable
USB Loop
Current
Reduction in USB
Charging Mode
Yes No
USB Voltage Test
VUSB < 4.5V
12 3686.2006.10.1.9

12 Page





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