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PDF AAT3685 Data sheet ( Hoja de datos )
| Número de pieza | AAT3685 | |
| Descripción | Lithium-Ion/Polymer Battery Charger | |
| Fabricantes | AAT | |
| Logotipo |  |
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AAT3685
Lithium-Ion/Polymer Battery Charger
General Description
BatteryManager™
Features
The AAT3685 BatteryManager™ is a highly inte-
• Adapter or USB Charger
grated single cell lithium-ion/polymer battery charg-
— Programmable up to 1A Max
er IC designed to operate with USB port or line
• 4.0V to 5.5V Input Voltage Range
adapter inputs. It requires the minimum number of
• High Level of Integration With Internal:
external components.
— Charging Device
The AAT3685 precisely regulates battery charge volt-
age and current for 4.2V lithium-ion/polymer battery
cells. Regardless of the type of input power source
(USB or adapter), the AAT3685 can be programmed
for two separate constant current charge levels up to
1A. An optional Charge Reduction Loop is built in to
allow users to charge the battery with available cur-
rent from the charge supply, while keeping the port
voltage regulated.
Battery temperature and charge state are fully
monitored for fault conditions. In the event of an
— Reverse Blocking Diode
— Current Sensing
• Automatic Recharge Sequencing
• Charge Reduction Loop
• 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
over-voltage or over-temperature failure, the
device will automatically shut down, thus protecting
the charging device, control system, and the bat-
tery under charge. Status monitor output pins are
Applications
provided to indicate the battery charge status by
directly driving two external LEDs. A serial interfacewww.DataSheet4U.com• Cellular Telephones
output is available to report any one of 14 various
• Digital Still Cameras
status states to a microcontroller.
• Hand-Held PCs
The AAT3685 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.
• MP3 Players
• Personal Data Assistants (PDAs)
• Other Lithium-Ion/Polymer Battery-Powered
Devices
Typical Application
Enable
Adapter or USB Input
Input Hi/Lo Select
RSETH
ADP/USB EN CHR
PWRSEL
SETH
BAT
SETL
TS
RSETL AAT3685
GND
BATT+
C2
10μF
BATT-
STAT1
DATA
STAT2
TEMP
Battery Pack
Serial Data
3685.2006.10.1.3
1
1 page  
AAT3685
Lithium-Ion/Polymer Battery Charger
Electrical Characteristics1
VADP = 5V, TA = -25°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C.
Symbol Description
Logic Control / Protection
VPWRSEL(H)
VPWRSEL(L)
VEN(H)
VEN(L)
IEN(H)
VSTAT
ISTAT
VOVP
Input High Threshold
Input Low Threshold
Input High Threshold
Input Low Threshold
EN Input Current
Output Low Voltage
STAT Pin Current Sink Capability
Over-Voltage Protection Threshold
ITK/ICHG Pre-Charge Current
ITERM/ICHG
ITERM/ICHG
ITS
Charge Termination Threshold Current
Charge Termination Threshold Current
Current Source from TS Pin
TS1 TS Hot Temperature Fault
TS2
I_DATA
VDATA(H)
VDATA)(L)
SQPULSE
tPERIOD
fDATA
TOVSD
TS Cold Temperature Fault
DATA Pin Sink Current
Input High Threshold
Input Low Threshold
Status Request Pulse Width
System Clock Period
Data Output Frequency
Over-Temperature Shutdown Threshold
Conditions
Min Typ Max Units
1.6 V
0.4 V
1.6 V
0.4 V
AAT3685-1 Only, VEN = 5V
STAT Pin Sinks 4mA
10 μA
0.4 V
8.0 mA
4.4 V
For SETH Mode
For SETL Mode
10
50
%
For SETH Mode
7.5 %
For SETL Mode
35 %
70 80 90 μA
Threshold
Hysteresis
310 330 350
15
mV
Threshold
2.2 2.3 2.4
V
Hysteresis
10 mV
DATA Pin is Active Low State 3.0
mA
1.6 V
0.4 V
Status Request
200
ns
50 μs
20 kHz
145 °C
1. The AAT3685 output charge voltage is specified over the 0° to 70°C ambient temperature range; operation over the -25°C to +85°C
temperature range is guaranteed by design.
3685.2006.10.1.3
5
5 Page 
AAT3685
Lithium-Ion/Polymer Battery Charger
Charge Complete Voltage
Regulated Current
Preconditioning
Trickle Charge
Phase
Constant Current
Charge Phase
I = Max CC
Constant Voltage
Charge Phase
Constant Current Mode
Voltage Threshold
Trickle Charge and I = CC / 10
Termination Threshold
Figure 1: Current vs. Voltage Profile During Charging Phases.
Charging Operation
The AAT3685 has four basic modes for the battery
charge cycle and is powered from the input: pre-con-
ditioning/trickle charge; constant current/fast charge;
constant voltage; and end of charge. For reference,
Figure 1 shows the current versus voltage profile
during charging phases.
Battery Preconditioning
Before the start of charging, the AAT3685 checks
several conditions in order to assure a safe charging
environment. The input supply must be above the
minimum operating voltage, or under-voltage lockout
threshold (VUVLO), for the charging sequence to
begin. In addition, the cell temperature, as reported
by a thermistor connected to the TS pin from the bat-
tery, must be within the proper window for safe
charging. When these conditions have been met and
a battery is connected to the BAT pin, the AAT3685
checks the state of the battery. If the cell voltage is
below the Preconditioning Voltage Threshold (VMIN),
the AAT3685 begins preconditioning the cell.
The battery preconditioning trickle charge current
is equal to the fast charge constant current divided
by 10. For example, if the programmed fast charge
current is 500mA, then the preconditioning mode
(trickle charge) current will be 50mA. Cell precon-
ditioning is a safety precaution for a deeply dis-
charged battery and also aids in limiting power dis-
sipation in the pass transistor when the voltage
across the device is at the greatest potential.
Fast Charge / Constant Current Charging
Battery cell preconditioning continues until the volt-
age on the BAT pin exceeds the Preconditioning
Voltage Threshold (VMIN). At this point, the AAT3685
begins the constant current fast charging phase.
The fast charge constant current (ICC) amplitude is
determined by the selected charge mode SETH or
SETL and is programmed by the user via the RSETH
and RSETL resistors. The AAT3685 remains in con-
stant current charge mode until the battery reaches
the voltage regulation point, VBAT.
Constant Voltage Charging
The system transitions to a constant voltage charg-
ing mode when the battery voltage reaches output
charge regulation threshold (VBAT) during the con-
stant current, fast charge phase. The regulation
voltage level is factory programmed to 4.2V ( 1%).
The charge current in the constant voltage mode
drops as the battery cell under charge reaches its
maximum capacity.
End of Charge Cycle Termination and Recharge
Sequence
When the charge current drops to 7.5% of the pro-
grammed fast charge current level in the constant volt-
age mode, the device terminates charging and goes
into a sleep state. The charger will remain in a sleep
state until the battery voltage decreases to a level
below the battery recharge voltage threshold (VRCH).
When the input supply is disconnected, the charg-
er will also automatically enter power-saving sleep
mode. Only consuming an ultra-low 0.3μA in sleep
mode (1μA for AAT3685-1), the AAT3685 mini-
mizes battery drain when it is not charging. This
feature is particularly useful in applications where
the input supply level may fall below the battery
charge or under-voltage lockout level. In such
cases where the AAT3685 input voltage drops, the
device will enter the sleep mode and automatically
resume charging once the input supply has recov-
ered from its fault condition.
3685.2006.10.1.3
11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet AAT3685.PDF ] | |
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