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PDF AAT3686 Data sheet ( Hoja de datos )
| Número de pieza | AAT3686 | |
| Descripción | USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger | |
| Fabricantes | AAT | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AAT3686 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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AAT3686
USB Port/AC Adapter
Lithium-Ion/Polymer Battery Charger
General Description
BatteryManager™
Features
The AAT3686 BatteryManager is a highly integrated
• USB Port/AC Adapter System Power Charger
single-cell lithium-ion/polymer battery charger IC
— USB: Programmable to 500mA for
designed to operate with USB port and AC adapter
USB Hi/Lo
inputs. It requires the minimum number of external
— Adapter: Programmable to 1.5A Max
components.
• 4.0V to 5.5V Input Voltage Range
The AAT3686 precisely regulates battery charge
voltage and current for 4.2V lithium-ion/polymer
battery cells. Adapter charge current rates can be
programmed up to 1.5A. In the absence of an
adapter and with a USB port connected, the battery
can also be charged by USB power. Depending on
the USB port type, the AAT3686 charge current can
be programmed for two separate levels up to
500mA. An optional Charge Reduction Loop is also
built in to allow users to charge the battery with
available current from a USB port, while keeping
the port voltage regulated. USB charging is dis-
abled when an adapter is present.
Battery temperature and charge state are fully moni-
tored for fault conditions. In the event of an over-volt-
age or over-temperature failure, the device will auto-
matically shut down, thus protecting the charging
• Adapter Present Indicator (ADPP# Pin)
• Adapter Presence Automatically Disables
USB Charging
• High Level of Integration With Internal:
— Charging Devices
— Reverse Blocking Diodes
— Current Sensing
• Automatic Recharge Sequencing
• Digital Thermal Regulation in ADP Charge
• Charge Reduction Loop in USB Charge
• Battery Temperature Monitoring
• Full Battery Charge Auto Turn-Off
• Over-Voltage and Emergency Thermal
Protection
• Power On Reset and Soft Start
• Serial Interface Status Reporting
• TDFN34-16 or TDFN44-16 Package
device, control system, and the battery under charge.www.DataSheet4U.com
Status monitor output pins are provided to indicate
the battery charge status by directly driving two exter-
nal LEDs. A serial interface output is available to
Applications
report 22 various status states to a microcontroller.
The AAT3686 is available in a Pb-free, thermally-
enhanced, space-saving TDFN34-16 (3x4mm) or
TDFN44-16 (4x4mm) package and is rated over the
-40°C to +85°C temperature range.
Typical Application
• Cellular Telephones
• Digital Still Cameras
• Hand-Held PCs
• MP3 Players
• Personal Data Assistants (PDAs)
• Other Lithium-Ion/Polymer Battery-Powered
Devices
Enable
USB Input
USB Hi/Lo Select
RSETH
ADP Present
ADP Input
USB EN
USBSEL
USBH
CHR
BAT
USBL
TS
RSETL
AAT3686 CT
ADPP#
ADP
ADPSET
RSET STAT1
GND
DATA
STAT2
CT
BATT+
C2
10μF
BATT-
TEMP
Battery Pack
Serial Data
3686.2006.10.1.9
1
1 page  
AAT3686
USB Port/AC Adapter
Lithium-Ion/Polymer Battery Charger
Electrical Characteristics1
VADP = 5V, TA = -25°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C.
Symbol Description
Conditions
Min Typ
Logic Control / Protection
VUSBSEL(H)
VUSBSEL(L)
VEN(H)
VEN(L)
IEN(H)
VADPP#
TP
TC
Input High Threshold
Input Low Threshold
Input High Threshold
Input Low Threshold
EN Input Current
Output Low Voltage
Preconditioning Time Out (ADP mode only)
Preconditioning and Constant Current Mode
Time Out (ADP mode only)
TV
Constant Voltage Mode Time Out
(ADP mode only)
VSTAT
ISTAT
VOVP
Output Low Voltage
STAT Pin Current Sink Capability
Over-Voltage Protection Threshold
ITK/ICHG Pre-Charge Current
ITERM/ICHG
ITS
TS1
Charge Termination Threshold Current
Current Source from TS Pin
TS Hot Temperature Fault
TS2 TS Cold Temperature Fault
I_DATA
I_ADPP#
VDATA(H)
VDATA)(L)
SQPULSE
tPERIOD
fDATA
TREG
TLOOP_IN
TLOOP_OUT
TOVSD
DATA Pin Sink Current
ADPP# Current Sink Capability
Input High Threshold
Input Low Threshold
Status Request Pulse Width
System Clock Period
Data Output Frequency
Thermal Loop Regulation
Thermal Loop Entering Threshold
Thermal Loop Exiting Threshold
Over-Temperature Shutdown Threshold
AAT3686-1 Only; VEN = 5V
ADPP# Pin Sinks 4mA
CCT = 100nF, V_ADP = 5.5V
CCT = 100nF, V_ADP = 5.5V
CCT = 100nF, V_ADP = 5.5V
STAT Pin Sinks 4mA
For Adapter or USBH Mode
For USBL Mode
For Adapter or USBH Mode
For USBL Mode
Threshold
Hysteresis
Threshold
Hysteresis
DATA Pin is Active Low State
ADPP# Pin is Active Low State
Status Request
1.6
1.6
70
310
2.2
3
1.6
200
25
3.0
3.0
8.0
4.4
10
50
7.5
35
80
330
15
2.3
10
8
50
20
90
110
85
145
Max Units
V
0.4 V
V
0.4 V
10 µA
0.4 V
Minute
Hour
Hour
0.4 V
mA
V
%
%
90 µA
350 mV
2.4 V
mV
mA
mA
V
0.4 V
ns
µs
kHz
°C
°C
°C
°C
1. The AAT3686 output charge voltage is specified over the 0° to 70°C ambient temperature range; operation over the -25°C to +85°C
temperature range is guaranteed by design.
3686.2006.10.1.9
5
5 Page 
AAT3686
USB Port/AC Adapter
Lithium-Ion/Polymer Battery Charger
Charging Operation
Regardless of which charge input function is selected (i.e., either the adapter input or USB input), the AAT3686
has four basic modes for the battery charge cycle: pre-conditioning/trickle charge; constant current/fast charge;
constant voltage; and end of charge (see Figure 1).
Charge Complete Voltage
Regulated Current
Preconditioning
Trickle Charge
Phase
Constant Current
Charge Phase
I = Max CC
Constant Voltage
Charge Phase
Constant Current Mode
Voltage Threshold
Trickle Charge and I = CC / 10
Termination Threshold
Figure 1: Current vs. Voltage Profile During Charging Phases.
Battery Preconditioning
Before the start of charging, the AAT3686 checks
several conditions in order to assure a safe charging
environment. The input supply must be above the
minimum operating voltage, or under-voltage lock-
out threshold (VUVLO), for the charging sequence to
begin. Also, the cell temperature, as reported by a
thermistor connected to the TS pin from the battery,
must be within the proper window for safe charging.
When these conditions have been met and a battery
is connected to the BAT pin, the AAT3686 checks
the state of the battery. If the cell voltage is below the
preconditioning voltage threshold (VMIN), the
AAT3686 begins preconditioning the cell.
The battery preconditioning trickle charge current is
equal to the fast charge constant current divided by
10 (USBL divided by 2). For example, if the pro-
grammed fast charge current is 500mA, then the
preconditioning mode (trickle charge) current will be
50mA. Cell preconditioning is a safety precaution for
a deeply discharged battery and also aids in limiting
power dissipation in the pass transistor when the
voltage across the device is at the greatest potential.
Fast Charge / Constant Current Charging
Cell preconditioning continues until the voltage on
the BAT pin exceeds the preconditioning voltage
threshold (VMIN). At this point, the AAT3686 begins
the constant current fast charging phase. The fast
charge constant current (ICC) amplitude is deter-
mined by the charge mode, ADP, USBH or USBL,
and is programmed by the user via the RSET, RSETH,
and RSETL resistors. The AAT3686 remains in con-
stant current charge mode until the battery reaches
the voltage regulation point, VBAT.
Constant Voltage Charging
The system transitions to a constant voltage charg-
ing mode when the battery voltage reaches the
output charge regulation threshold (VBAT) during
the constant current fast charge phase. The regu-
lation voltage level is factory programmed to 4.2V
(±1%). Charge current in the constant voltage
mode drops as the battery cell under charge reach-
es its maximum capacity.
End of Charge Cycle Termination and
Recharge Sequence
When the charge current drops to 7.5% (35% for
USBL) of the programmed fast charge current level
in the constant voltage mode, the device termi-
nates charging and goes into a standby state. The
charger will remain in a standby state until the bat-
tery voltage decreases to a level below the battery
recharge voltage threshold (VRCH).
3686.2006.10.1.9
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet AAT3686.PDF ] | |
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