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PDF AAT3682 Data sheet ( Hoja de datos )
| Número de pieza | AAT3682 | |
| Descripción | Li-Ion/Polymer Linear Battery Charger | |
| Fabricantes | Skyworks | |
| Logotipo |  |
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General Description
The AAT3682 is a lithium-ion/polymer linear battery
charger. It is designed for compact portable applications
with a single-cell battery. The AAT3682 precisely regu-
lates battery charge voltage and charge current, and
offers an integrated pass device, minimizing the number
of external components required.
The AAT3682 charges the battery in three different
phases: preconditioning, constant current, and constant
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 care-
fully monitored for fault conditions. A battery charge
stable monitor output pin is provided to indicate the bat-
tery charge status through a display LED or interface to
a system controller. 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.
The AAT3682 is available in a Pb-free, 16-pin QFN44
package and is specified over the -20°C to +70°C tem-
perature range.
DATA SHEET
AAT3682
Li-Ion/Polymer Linear Battery Charger
Features
• 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
Applications
• 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
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201884B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
1
1 page  
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. 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
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
DATA SHEET
AAT3682
Li-Ion/Polymer Linear Battery Charger
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. 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 Current vs. Temperature
(RSENSE = 0.15Ω)
170
165
160
155
150
145
140
135
130
-50
-25
0 25 50 75 100
Temperature (°C)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201884B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
5
5 Page 
Resuming Charge and the VRCH Threshold
The AAT3682 will automatically resume charging under
most conditions when a battery charge cycle is inter-
rupted. Events such as an input supply interruption or
under voltage, removal and replacement of the battery
under charge, or charging a partially drained battery are
all possible. The AAT3682 will monitor the battery volt-
age and automatically resume charging in the appropri-
ate mode based upon the measured battery cell voltage.
This feature is useful for systems with an unstable input
supply, which could be the case when powering a char-
ger from a USB bus supply. It is also beneficial for charg-
ing or “topping off” partially discharged batteries. The
only restriction on resuming charge of a battery is that
the battery cell voltage must be below the battery
recharge voltage threshold (VRCH) specification. There is
VRCH threshold hysteresis built into the charge control
system. This is done to prevent the charger from errone-
ously 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 inadver-
tently removed and then restored. The battery is below
the VRCH threshold and the charge cycle will immediately
resume where it left off.
DATA SHEET
AAT3682
Li-Ion/Polymer Linear Battery Charger
LED Display Charge Status Output
The AAT3682 provides a battery charge status output 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 dis-
play 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 circuit
-OR- when an over-voltage (OV) condition is detect-
ed at the BAT pin -OR- when a battery over-temper-
ature 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 system is in
constant current charge mode.
5. Constant Voltage (CV) Mode: When the system 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 peri-
ods. 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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201884B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AAT3682.PDF ] | |
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