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AAT3682 Schematic ( PDF Datasheet ) - Skyworks

Teilenummer AAT3682
Beschreibung Li-Ion/Polymer Linear Battery Charger
Hersteller Skyworks
Logo Skyworks Logo 




Gesamt 18 Seiten
AAT3682 Datasheet, Funktion
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






AAT3682 Datasheet, Funktion
Typical Characteristics
Charging Current vs. Temperature
(RSENSE = 0.15Ω)
700
690
680
670
660
650
-50
-25
0 25 50
Temperature (°C)
75 100
Charging Current vs. Battery Voltage
(RSENSE = 0.15Ω with External Schottky)
700
600
500
VIN = 4.5V
VIN = 5.5V
400 VIN = 4.75V
300
200
100
0
2.5 3.0 3.5 4.0 4.5 5.0
Battery Voltage (V)
Charging Current vs. Input Voltage
(RSENSE = 0.2Ω with External Schottky)
600
500
400
VBAT = 4.0V
300
200 VBAT = 3.6V
100
0
4.0 4.5 5.0 5.5
Input Voltage (V)
6.0
DATA SHEET
AAT3682
Li-Ion/Polymer Linear Battery Charger
Charging Current vs. Input Voltage
(RSENSE = 0.15Ω with External Schottky)
700
600
500
VBAT = 4.1V
400
300
VBAT = 3.6V
200
100
0
4.0 4.5 5.0 5.5
Input Voltage (V)
6.0
Trickle Charge Current vs. Input Voltage
(RSENSE = 0.15Ω; 1.8X Mode)
170
165
160
155
150
145
140
135
130
4.0
4.5 5.0 5.5
Input Voltage (V)
6.0
Trickle Charge Current vs. Input Voltage
(RSENSE = 0.2Ω; 1.8X Mode)
104
102
100
98
96
94
4
4.5
5 5.5
6
Input Voltage (V)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
6 201884B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

6 Page









AAT3682 pdf, datenblatt
High-Speed Data Reporting
An optional system microcontroller interface can be
enabled by pulling the T2X pin up to 4.5V to 5.5V during
the power-up sequence. The T2X pin should be pulled
high with the use of a 100kresistor. If the input supply
to VIN will not exceed 5.5V, then the T2X pin may be tied
directly to VIN through a 100kresistor. Since this is a
TTL level circuit, it may not be pulled higher than 5.5V
without risk of damage to the device.
When the high-speed data report feature is enabled, the
STAT output periods are sped up to 40μs, making the
total status word 160μs in length. See Figure 4 below.
An additional feature is the Output Status for the Battery
Not Detected state. When the AAT3682 senses there is
no battery connected to the BAT pin, the STAT pin cycles
for two periods, then remains off for two periods. When
in high-speed data reporting, the AAT3682 will only
trickle charge at the 2X trickle charge level. This is
because the T2X pin is pulled high to enable the high-
speed data reporting. A status display LED may not be
connected to the STAT pin when the high-speed data
reporting is being utilized. If both display modes are
required, the display LED must be switched out of the
circuit before the T2X pin is pulled high. Failing to do so
could cause problems with the high-speed switching con-
trol circuits internal to the AAT3682.
Charge Complete LED Status Mode
A simplified LED status can be obtained by configuring
the AAT3682 for high-speed data reporting mode (T2X
tied to VCC) and installing a 0.047μF capacitor from the
STAT pin to the VSS pin (see Figure 5). In this configura-
tion, the LED will be illuminated for all modes except the
DATA SHEET
AAT3682
Li-Ion/Polymer Linear Battery Charger
Sleep/Charge Complete mode. In addition, the T2X input
must be tied to VCC through a 100kresistor. In this
mode, the trickle charge current will be 1.8X the normal
trickle charge level. To reset the trickle charge current to
the 1X level, the TS input must be temporarily toggled
low. Removing C3 forces the LED status to gradually dim
as the battery becomes fully charged (see Figure 5).
Protection Circuitry
The AAT3682 is a highly integrated battery management
system IC including several protection features. In addi-
tion to battery temperature monitoring, the IC constant-
ly monitors for over-current and over-voltage conditions;
if an over-current situation occurs, the AAT3682 latches
off the pass device to prevent damage to the battery or
the system, and enters shutdown mode until the over-
current event is terminated. An over-voltage condition is
defined as a condition where the voltage on the BAT pin
exceeds the maximum battery charge voltage. If an over-
voltage condition occurs, the IC turns off the pass device
until voltage on the BAT pin drops below the maximum
battery charge constant voltage threshold. The AAT3682
will resume normal operation after the over-current or
over-voltage condition is removed. During an over-cur-
rent or over-voltage event, the STAT will report a FAULT
signal. In the event of a battery over-temperature condi-
tion, the IC will turn off the pass device and report a
FAULT signal on the STAT pin. After the system recovers
from a temperature fault, the IC will resume operation in
the 1X trickle charge mode to prevent damage to the
system in the event a defective battery is placed under
charge. Once the battery voltage rises above the trickle
charge to constant current charge threshold, the IC will
resume the constant current mode.
Charge Status
Sleep / Charge Complete
Temp., OC, OV Fault
Battery Conditioning
Constant Current Mode
Constant Voltage Mode
Output Status
HI / HI / HI / HI
LO / LO / HI / HI
LO / LO / LO / LO
LO / LO / LO / HI
LO / HI / HI / HI
STAT Level
Figure 4: Microcontroller Interface Logic Output.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
12 201884B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

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