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AAT3688 Schematic ( PDF Datasheet ) - AAT

Teilenummer AAT3688
Beschreibung USB Port Lithium-Ion/Polymer Battery Charger
Hersteller AAT
Logo AAT Logo 




Gesamt 23 Seiten
AAT3688 Datasheet, Funktion
AAT3688
USB Port Lithium-Ion/Polymer Battery Charger
General Description
BatteryManager
Features
The AAT3688 BatteryManager™ is a highly inte-
• USB Charger
grated single cell lithium-ion/polymer battery
— Programmable up to 500mA Max
charger IC designed to operate with USB port
• 4.0V to 5.5V Input Voltage Range
inputs. It requires the minimum number of external
• High Level of Integration With Internal:
components.
— Charging Device
The AAT3688 precisely regulates battery charge
voltage and current for 4.2V lithium-ion/polymer
battery cells. Depending on the USB port type, the
AAT3688 charge current can be programmed for
two separate levels up to 500mA. An optional
Charge Reduction Loop is built in to allow users to
charge the battery with available current from a
USB port, while keeping the port voltage regulated.
Battery temperature and charge state are fully
monitored for fault conditions. In the event of an
over-voltage or over-temperature failure, the
— Reverse Blocking Diode
— Current Sensing
• Automatic Recharge Sequencing
• Charge Reduction Loop for USB Charging
• Battery Temperature Monitoring
• Full Battery Charge Auto Turn-Off
• Over-Voltage Protection
• Emergency Thermal Protection
• Power On Reset and Soft Start
• Serial Interface Status Reporting
• 12-Pin 3x3mm TDFN Package
device will automatically shut down, thus protecting
the charging device, control system, and the bat-
tery under charge. Status monitor output pins are
provided to indicate the battery charge status by
Applications
directly driving two external LEDs. A serial interface
output is available to report any one of 14 various •www.DataSheet4U.com Bluetooth™ Headsets
status states to a microcontroller.
• Cellular Telephones
The AAT3688 is available in a Pb-free, thermally-
enhanced, space-saving 12-pin 3x3mm TDFN
package and is rated over the -40°C to +85°C tem-
perature range.
• Digital Still Cameras
• Hand-Held PCs
• MP3 Players
• Personal Data Assistants (PDAs)
• Other Lithium-Ion/Polymer Battery-Powered
Devices
Typical Application
Enable
USB Input
USB Hi/Lo Select
RSETH
USB
USBSEL
USBH
EN CHR
BAT
USBL
TS
RSETL AAT3688
GND
STAT1
DATA
STAT2
BATT+
C2
10μF
BATT-
TEMP
Battery Pack
Serial Data
3688.2006.10.1.5
1






AAT3688 Datasheet, Funktion
AAT3688
USB Port Lithium-Ion/Polymer Battery Charger
Typical Characteristics
IFASTCHARGE vs. RSET
1000
Battery Voltage vs. Supply Voltage
4.242
USBL
100
USBH
4.221
4.200
4.179
10
1
4.158
10 100 1000
4.5 4.75
5
5.25 5.5
RSET (kΩ)
Supply Voltage (V)
Recharge Voltage vs. Temperature
4.140
4.130
4.120
4.110
4.100
4.090
4.080
4.070
4.060
4.050
4.040
-50
-25
0
25 50
Temperature (°C)
75 100
End of Charge Voltage vs. Temperature
4.242
4.221
4.200
4.179
4.158
-50
-25
0
25 50
Temperature (°C)
75 100
3.05
3.04
3.03
3.02
3.01
3.00
2.99
2.98
2.97
2.96
2.95
-50
Preconditioning Threshold
Voltage vs. Temperature
-25 0
25 50
Temperature (°C)
75
100
Preconditioning Charge Current vs. Temperature
(USBH; USBH = 8.06kΩ)
60
55
50
45
40
-50
-25 0
25 50
Temperature (°C)
75 100
6 3688.2006.10.1.5

6 Page









AAT3688 pdf, datenblatt
AAT3688
USB Port Lithium-Ion/Polymer Battery Charger
System Operation Flow Chart
Switch
On
Sleep
Mode
No UVLO
VP > VUVLO
Yes
USB
Power
Power On
Reset
USB Low
Current Loop
USB High
Current Loop
Fault Conditions
Monitor
OV, OT
Yes
No Shut Down
Mode
Yes
Battery
No
Temperature Monitor
Battery
VTS1 < TS < VTS2
Temp. Fault
0 USB Detect
USBSEL= ?
1
USB Voltage
Regulation
Enable
No
Recharge Test
VRCH > VBAT
Yes Yes Low Current
Preconditioning Test
Conditioning
VMIN > VBAT
Charge
No
Current Phase Test
VEOC > VBAT
Yes
Current
Charging
Mode
No
Yes
Voltage Phase Test
IBAT > ITERM
No
Charge
Completed
Voltage
Charging
Mode
No
USB Voltage Test
VUSB < 4.5V
Yes
USB
Loop Current
Reduction in USB
Charging Mode
12 3688.2006.10.1.5

12 Page





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