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PDF AAT3681A Data sheet ( Hoja de datos )
| Número de pieza | AAT3681A | |
| Descripción | 500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger | |
| Fabricantes | Advanced Analogic Technologies | |
| Logotipo |  |
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AAT3681A
500mA USB Port or AC Adapter
Lithium-Ion/Polymer Battery Charger
General Description
BatteryManager™
Features
www.datasheTeht4euA.cAomT3681A 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 7.5V. It requires
just one external component.
The AAT3681A 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 500mA.
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.
The AAT3681A is available in a Pb-free, thermally
enhanced, space-saving 8-pin 2.0x2.1mm SC70JW
package and is specified for operation over the
-40°C to +85°C temperature range.
Typical Application
• USB or AC Adapter System Power Charger
— Programmable from 15mA to 500mA
• 4.0V ~ 7.5V 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 (AAT3681A-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
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
Adapter/USB Input
Enable
RSET
ADP
BAT
AAT3681A
STAT
EN
ISET
GND
BATT+
C
BATT-
Battery
Pack
3681A.2007.10.1.2
1
1 page  
AAT3681A
500mA USB Port or AC Adapter
Lithium-Ion/Polymer Battery Charger
Typical Characteristics
www.datasheet4u.com
1000
Constant Charging Current
vs. Set Resistor Values
100
10
1
1 10 100
RSET (kΩ)
1000
Charging Current vs. Battery Voltage
(AAT3681A, AAT3681A-2 and AAT3681A-3 only)
600
RSET = 3.24kΩ
500
400 RSET = 5.36kΩ
300
200 RSET = 8.06kΩ
RSET = 16.2kΩ
100
0 RSET = 31.6kΩ
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
(AAT3681A-1 only)
600
500 RSET = 3.24kΩ
400
RSET = 5.36kΩ
300
200 RSET = 8.06kΩ
RSET = 16.2kΩ
100
0 RSET = 31.6kΩ
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3
VBAT (V)
4.220
4.215
4.210
4.205
4.200
4.195
4.190
4.185
4.180
4.5
End of Charge Battery Voltage
vs. Input Voltage
5.0 5.5 6.0 6.5 7.0
Input Voltage (V)
7.5
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. Input Voltage
(RSET = 8.06kΩ)
280
260
240
220 VBAT = 3.3V
200
180
160 VBAT = 3.6V
140
120
4
VBAT = 4.0V
4.5 5
5.5
6
6.5 7
7.5
Input Voltage (V)
3681A.2007.10.1.2
5
5 Page 
AAT3681A
500mA USB Port or AC Adapter
Lithium-Ion/Polymer Battery Charger
Application Information
www.datasheAetd4ua.cpotmer or USB Power Input
Constant current charge levels up to 500mA may
be programmed by the user when powered from a
sufficient input power source. The AAT3681A will
operate from the adapter input over a 4.0V to 7.5V
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 AAT3681A 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 auto-
matically resume charging in the appropriate mode
for the condition of the battery.
Enable / Disable
The AAT3681A provides an enable function to con-
trol the charger IC on and off. The EN pin functions
as follows on the various AAT3681A options:
AAT3681A and AAT3681A-1: The enable (EN) pin
is internally pulled down. When pulled to a logic
high level, the AAT3681A is enabled. When left
open or pulled to a logic low level, the AAT3681A
will be shut down and forced into the sleep state.
AAT3681A-2: The enable (EN) pin is internally
pulled down. When left open or pulled to a logic low
level, the AAT3681A-2 is enabled. When pulled to
a logic high level, the AAT3681A-2 will be shut
down and forced into the sleep state.
AAT3681A-3: The enable (EN) pin is not internally
pulled down. When pulled to a logic low level, the
AAT3681A-3 is enabled. When pulled to a logic
high level, the AAT3681A-3 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 automati-
cally reset and resume charging functions with the
appropriate charging mode based on the battery
3681A.2007.10.1.2
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 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.
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AAT3681A.PDF ] | |
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