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PDF AAT3681 Data sheet ( Hoja de datos )
| Número de pieza | AAT3681 | |
| Descripción | USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger | |
| Fabricantes | AAT | |
| Logotipo |  |
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AAT3681
USB Port or AC Adapter
Lithium-Ion/Polymer Battery Charger
General Description
BatteryManager™
Features
The AAT3681 BatteryManager is an integrated sin-
gle cell lithium-ion/polymer battery charger IC,
designed to operate from a DC power source or
USB port up to an input voltage of 6.5V. It requires
just one external component.
The AAT3681 precisely regulates battery charge
voltage and current for 4.2V (4.375V option) lithium-
ion/polymer battery cells. When charged from an
AC adapter or USB port, the battery charging cur-
rent can be set by an external resistor up to 300mA.
Battery charge state is continuously monitored for
fault conditions. In the event of an over-voltage,
short-circuit, or over-temperature failure, the
device will automatically shut down, thus protecting
the charging device, control system, and the bat-
tery under charge. A status monitor output pin is
provided to indicate the battery charge status by
directly driving an external LED.
• USB or AC Adapter System Power Charger
— Programmable from 15mA to 300mA
• 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 (AAT3681-1 is No Trickle Charge
Option)
• Over-Voltage and Emergency Thermal
Protection
• Power On Reset and Soft Start
• LED Status Pin
• 8-Pin 2.0x2.1mm SC70JW Package
The AAT3681 is available in a Pb-free, thermally
enhanced, space-saving 8-pin 2.0x2.1mm SC70JW
package and is specified for operation
-40°C to +85°C temperature range.
Applicationsover thewww.DataSheet4U.com
Typical Application
• 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
Adapter/USB Input
Enable
RSET
ADP
BAT
AAT3681
STAT
EN
ISET
GND
BATT+
C
BATT-
Battery
Pack
3681.2007.01.1.2
1
1 page  
AAT3681
USB Port or AC Adapter
Lithium-Ion/Polymer Battery Charger
Typical Characteristics
Constant Charging Current
vs. Set Resistor Values
1000
100
10
1
1 10 100
RSET (kΩ)
1000
Charging Current vs. Battery Voltage
(AAT3681 Only)
350
RSET = 5.36kΩ
300
250
RSET = 8.06kΩ
200
150 RSET = 16.2kΩ
100
50
RSET = 31.6kΩ
0
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
(AAT3681-1 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 75 100
Temperature (°C)
Constant Charging Current vs.
Supply Voltage
(RSET = 8.06kΩ)
220
210
VBAT = 3.3V
200
190 VBAT = 3.6V
180
VBAT = 4V
170
4
4.25 4.5 4.75
5 5.25 5.5 5.75
VIN (V)
6
6.25 6.5
3681.2007.01.1.2
5
5 Page 
AAT3681
USB Port or AC Adapter
Lithium-Ion/Polymer Battery Charger
Application Information
Adapter or USB Power Input
Constant current charge levels up to 300mA may
be programmed by the user when powered from a
sufficient input power source. The AAT3681 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 con-
nected between ISET and ground. Refer to Table 1
for recommended RSET values for a desired con-
stant current charge level.
Adapter Input Charge Inhibit and Resume
The AAT3681 has a UVLO and power on reset fea-
ture so that if the input supply to the ADP pin drops
below the UVLO threshold, the charger will sus-
pend 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 auto-
matically resume charging in the appropriate mode
for the condition of the battery.
Enable / Disable
The AAT3681 provides an enable function to con-
trol the charger IC on and off. The enable (EN) pin
is internally pulled down. When pulled to a logic
high level, AAT3681 is enabled. When left open or
pulled to a logic low level, the AAT3681 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 trick-
le charge current, is dominated by the tolerance of
the set resistor used. For this reason, a 1% toler-
ance metal film resistor is recommended for the set
resistor function. Fast charge constant current lev-
els from 15mA to 300mA may be set by selecting
the appropriate resistor value from Table 1.
3681.2007.01.1.2
Nominal
ICHARGE (mA)
300
250
200
150
Set Resistor
Value (kΩ)
5.36
6.49
8.06
10.7
100 16.2
50 31.6
40 38.3
30 53.6
20 78.7
15 105
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 battery charge voltage and is set by the
over-voltage protection threshold (VOVP). If an over-
voltage condition occurs, the AAT3681 charge con-
trol will shut down the device until voltage on the
BAT pin drops below VOVP. The AAT3681 will
resume normal charging operation after the over-
voltage condition is removed.
Over-Temperature Shutdown
The AAT3681 has a thermal protection control circuit
which will shut down charging functions should the
internal die temperature exceed the preset thermal
limit threshold. Once the internal die temperature
falls below the thermal limit, normal operation will
resume the previous charging state.
11
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| PDF Descargar | [ Datasheet AAT3681.PDF ] | |
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