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PDF AAT3684 Data sheet ( Hoja de datos )
| Número de pieza | AAT3684 | |
| Descripción | 500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger | |
| Fabricantes | Advanced Analogic Technologies | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AAT3684 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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BatteryManagerTM
PRODUCT DATASHEET
AAT3684
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger
General Description
The AAT3684 BatteryManager is an integrated single cell
wwliwth.diuatmas-hieoent4/pu.ocloymmer battery charger IC, designed to oper-
ate from a DC power source or USB port up to an input
voltage of 6.5V. It requires just one external component.
The AAT3684 precisely regulates battery charge voltage
and current for 4.2V (4.375V option) lithium-ion/poly-
mer battery cells. When charged from an AC adapter or
USB port, the battery charging current can be set by an
external resistor up to 500mA.
Battery charge state is continuously monitored for fault
conditions. In the event of an over-voltage, short-cir-
cuit, or over-temperature failure, the device will auto-
matically shut down, thus protecting the charging device,
control system, and the battery under charge. A status
monitor output pin is provided to indicate the battery
charge status by directly driving an external LED.
The AAT3684 is available in a Pb-free, thermally
enhanced, space-saving 10-pin 2.2x2.2mm STDFN pack-
age and is specified for operation over the -40°C to
+85°C temperature range.
Features
• USB or AC Adapter System Power Charger
▪ Programmable from 15mA to 500mA
• 4.0V ~ 6.5V Input Voltage Range
• High Level of Integration with Internal:
▪ Charging Device
▪ Reverse Blocking Diode
• Automatic Current Sensing
• Automatic Recharge Sequencing
• Full Battery Charge Auto Turn Off/Sleep Mode/Charge
Termination
• Shutdown Current <1μA
• Automatic Trickle Charge for Battery Pre-Conditioning
(AAT3684-1 is No Trickle Charge Option)
• Over-Voltage and Emergency Thermal Protection
• Power On Reset and Soft Start
• LED Status Pin
• STDFN2.2x2.2-10 Package
Applications
• Bluetooth® Headsets
• DECT Headsets
• Digital Still Cameras
• MP3, Portable Music, and Portable Media Players
• Personal Data Assistants (PDAs)
• Wrist Watches
• Other Lithium-Ion/Polymer Battery-Powered Devices
Typical Application
Adapter/USB Input
Enable
RSET
ADP
BAT
AAT3684
STAT
EN
ISET
GND
BATT+
C
BATT-
Battery
Pack
3684.2007.12.1.2
www.analogictech.com
1
1 page  
BatteryManagerTM
PRODUCT DATASHEET
AAT3684
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger
Typical Characteristics
www.datasheet4Cu.ocnomstant Charging Current
vs. Set Resistor Values
1000
100
10
1
1 10 100
RSET (kΩ)
1000
Charging Current vs. Battery Voltage
(AAT3684 only)
600
RSET = 3.24K
500
400
RSET = 5.36K
300
200 RSET = 8.06K
100 RSET = 16.2K
0 RSET = 31.6K
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3
VBAT (V)
Charging Current vs. Battery Voltage
(AAT3684-1 only)
600
RSET = 3.24K
500
400
RSET = 5.36K
300
200 RSET = 8.06K
100 RSET = 16.2K
0 RSET = 31.6K
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3
VBAT (V)
End of Charge Battery Voltage
vs. Supply Voltage
4.206
4.204
4.202
RSET = 8.06kΩ
4.200
4.198
RSET = 31.6kΩ
4.196
4.194
4.5
4.75
5
5.25 5.5 5.75
VIN (V)
6
6.25 6.5
End of Charge Voltage Regulation
vs. Temperature
(RSET = 8.06kΩ)
4.23
4.22
4.21
4.20
4.19
4.18
4.17
-50
-25
0 25 50
Temperature (°C)
75 100
Constant Charging Current vs. Temperature
(RSET = 8.06kΩ)
210
208
205
203
200
198
195
193
190
-50
-25
0
25 50 75 100
Temperature (°C)
3684.2007.12.1.2
www.analogictech.com
5
5 Page 
BatteryManagerTM
PRODUCT DATASHEET
AAT3684
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger
Application Information
wwAwd.daatapshteeert4uo.cromUSB Power Input
Constant current charge levels up to 500mA may be
programmed by the user when powered from a sufficient
input power source. The AAT3684 will operate from the
adapter input over a 4.0V to 6.5V range. The constant
current fast charge current for the adapter input is set
by the RSET resistor connected between ISET and ground.
Refer to Table 1 for recommended RSET values for a
desired constant current charge level.
Adapter Input Charge Inhibit and Resume
The AAT3684 has a UVLO and power on reset feature so
that if the input supply to the ADP pin drops below the
UVLO threshold, the charger will suspend charging and
shut down. When power is re-applied to the ADP pin or
the UVLO condition recovers, the system charge control
will assess the state of charge on the battery cell and will
automatically resume charging in the appropriate mode
for the condition of the battery.
Enable / Disable
The AAT3684 provides an enable function to control the
charger IC on and off. The enable (EN) pin is internally
pulled down. When pulled to a logic high level, AAT3684
is enabled. When left open or pulled to a logic low level,
the AAT3684 will be shut down and forced into the sleep
state. Charging will be halted regardless of the battery
voltage or charging state. When the device is re-enabled,
the charge control circuit will automatically reset and
resume charging functions with the appropriate charging
mode based on the battery charge state and measured
cell voltage on the BAT pin.
Programming Charge Current
The fast charge constant current charge level is user
programmed with a set resistor placed between the ISET
pin and ground. The accuracy of the fast charge, as well
as the preconditioning trickle charge current, is domi-
nated by the tolerance of the set resistor used. For this
reason, a 1% tolerance metal film resistor is recom-
mended for the set resistor function. Fast charge con-
stant current levels from 15mA to 500mA may be set by
selecting the appropriate resistor value from Table 1.
Nominal
ICHARGE (mA)
500
450
400
350
300
250
200
150
100
50
40
30
20
15
Set Resistor
Value (kΩ)
3.24
3.57
4.12
4.64
5.36
6.49
8.06
10.7
16.2
31.6
38.3
53.6
78.7
105
Table 1: RSET Values.
1000
100
10
1
1 10 100 1000
RSET (kΩ)
Figure 2: Constant Charging Current
vs. Set Resistor Values.
Protection Circuitry
Over-Voltage Protection
An over-voltage event is defined as a condition where
the voltage on the BAT pin exceeds the maximum bat-
tery charge voltage and is set by the over-voltage pro-
tection threshold (VOVP). If an over-voltage condition
occurs, the AAT3684 charge control will shut down the
device until voltage on the BAT pin drops below VOVP. The
AAT3684 will resume normal charging operation after
the over-voltage condition is removed.
3684.2007.12.1.2
www.analogictech.com
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AAT3684.PDF ] | |
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