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PDF AAT3682 Data sheet ( Hoja de datos )
| Número de pieza | AAT3682 | |
| Descripción | Lithium-Ion/Polymer Linear Battery Charger | |
| Fabricantes | AAT | |
| Logotipo |  |
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AAT3682
Lithium-Ion/Polymer Linear Battery Charger
General Description
BatteryManager™
Features
The AAT3682 is a lithium-ion/polymer linear battery
charger. It is designed for compact portable appli-
cations with a single-cell battery. The AAT3682 pre-
cisely regulates battery charge voltage and charge
current, and offers an integrated pass device, mini-
mizing the number of external components required.
The AAT3682 charges the battery in three different
phases: preconditioning, constant current, and con-
stant voltage. In preconditioning mode, the charge
current has two different levels and is controlled by
one external pin. Battery charge temperature and
charge state are carefully monitored for fault condi-
tions. A battery charge stable monitor output pin is
provided to indicate the battery charge status
through a display LED or interface to a system con-
troller. The AAT3682 has a sleep mode option for
when the input supply is removed. In this mode, it
draws only 2.0µA of typical current.
• VIN Range: 4.7V to 6.0V
• Low Quiescent Current, Typically 0.5mA
• 1% Accurate Preset Voltage
• Up to 1A of Charging Current
• Integrated Pass Device
• Battery Temperature Monitoring
• Fast Trickle Charge Option
• Deep Discharge Cell Conditioning
• LED Charge Status Output or System
Microcontroller Serial Interface
• Power-On Reset
• Lower Power Sleep Mode
• Status Outputs for LED or System Interface
Indicates Charge and Fault Conditions
• Temperature Range: -20°C to +70°C
• 16-Pin QFN44 Package
The AAT3682 is available in a Pb-free, 16-pin
QFN44 package and is specified over the -20°C to
Applications
+70°C temperature range.
•www.DataSheet4U.com Cellular Telephones
• Digital Still Cameras
• Hand-Held PCs
• MP3 Players
• Personal Data Assistants (PDAs)
Typical Application
Adapter
RSENSE
CIN = 10μF
VP
R3
Gate
R4
DRV
BAT
T2X
BSENSE
CSI TS
VCC
STAT
VSS
VP
RT1
BATT+
COUT= 1μF
BATT-
LED 1
R2 = 1K
RT2
TEMP
3682.2006.12.1.3
1
1 page  
AAT3682
Lithium-Ion/Polymer Linear Battery Charger
Typical Characteristics
Battery Recharge Threshold Voltage
vs.Temperature
(RSENSE = 0.15Ω)
4.20
4.15
4.10
4.05
4.00
3.95
3.90
3.85
3.80
-50
-25
0
25 50 75
Temperature (°C)
100
Regulated Output Voltage vs. Charge Current
(RSENSE = 0.15Ω)
4.25
4.23
4.21
4.19
4.17
4.15
0
100 200 300 400 500 600 700
Charging Current (mA)
Regulated Output Voltage vs. Input Voltage
(RSENSE = 0.15Ω)
4.40
4.30
4.20
4.10
4.00
4.0
4.5 5.0 5.5 6.0
Input Voltage (V)
6.5
Regulated Output Voltage vs. Temperature
(RSENSE = 0.15Ω)
4.250
4.225
4.200
4.175
4.150
4.125
4.100
-50
-25 0
25 50
Temperature (°C)
75 100
Trickle Charge Threshold Voltage
vs.Temperature
(RSENSE = 0.15Ω)
3.4
3.3
3.2
3.1
3.0
2.9
2.8
-50
-25
0 25 50
Temperature (°C)
75
100
Trickle Charge Current vs. Temperature
(RSENSE = 0.15Ω)
170
165
160
155
150
145
140
135
130
-50
-25
0 25 50 75 100
Temperature (°C)
3682.2006.12.1.3
5
5 Page 
AAT3682
Lithium-Ion/Polymer Linear Battery Charger
system. This is done to prevent the charger from
erroneously turning on and off once a battery
charge cycle is complete.
For example, the AAT3682 has a typical VRCH
threshold of 4.1V. A battery under charge is above
4.1V, but is still in the constant voltage mode
because it has not yet reached 4.2V to complete
the charge cycle. If the battery is removed and
then placed back on the charger, the charge cycle
will not resume until the battery voltage drops
below the VRCH threshold. In another case, a bat-
tery under charge is in the constant current mode
and the cell voltage is 3.7V when the input supply
is inadvertently removed and then restored. The
battery is below the VRCH threshold and the charge
cycle will immediately resume where it left off.
LED Display Charge Status Output
The AAT3682 provides a battery charge status out-
put via the STAT pin. STAT is an open-drain serial
data output capable of displaying five distinct status
functions with one LED connected between the
STAT pin and VP. There are four periods which
determine a status word. Under default conditions,
each output period is one second long; thus one
status word will take four seconds to display
through an LED. The five modes include:
1. Sleep/Charge Complete: The IC goes into
Sleep mode when no battery is present -OR-
when the charge cycle is complete.
2. Fault: When an over-current (OC) condition is
detected by the current sense and control cir-
cuit -OR- when an over-voltage (OV) condition
is detected at the BAT pin -OR- when a battery
over-temperature fault is detected on the
TEMP pin.
3. Battery Conditioning: When the charge system
is in 1X or 2X trickle charge mode.
4. Constant Current (CC) Mode: When the sys-
tem is in constant current charge mode.
5. Constant Voltage (CV) Mode: When the sys-
tem is in constant voltage charge mode.
An additional feature of the LED status display is for
a Battery Not Detected state. When the AAT3682
senses there is no battery connected to the BAT
pin, the STAT output will turn the LED on and off at
a rate dependent on the size of the output capacitor
being used. The LED cycles on for two periods then
remains off for two periods. See Figure 3 below.
Charge Status
Sleep / Charge Complete
Temp., OC, OV Fault
Battery Conditioning
Constant Current Mode
Constant Voltage Mode
Output Status
off / off / off / off
on / on / off / off
on / on / on / on
on / on / on / off
on / off / off / off
on/off
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
LED Display
on/off on/off
on/off
Figure 3: LED Display Output.
3682.2006.12.1.3
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AAT3682.PDF ] | |
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