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PDF AAT3688 Data sheet ( Hoja de datos )
| Número de pieza | AAT3688 | |
| Descripción | USB Port Lithium-Ion/Polymer Battery Charger | |
| Fabricantes | AAT | |
| Logotipo |  |
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AAT3688
USB Port Lithium-Ion/Polymer Battery Charger
General Description
BatteryManager™
Features
The AAT3688 BatteryManager™ is a highly inte-
• USB Charger
grated single cell lithium-ion/polymer battery
— Programmable up to 500mA Max
charger IC designed to operate with USB port
• 4.0V to 5.5V Input Voltage Range
inputs. It requires the minimum number of external
• High Level of Integration With Internal:
components.
— Charging Device
The AAT3688 precisely regulates battery charge
voltage and current for 4.2V lithium-ion/polymer
battery cells. Depending on the USB port type, the
AAT3688 charge current can be programmed for
two separate levels up to 500mA. An optional
Charge Reduction Loop is built in to allow users to
charge the battery with available current from a
USB port, while keeping the port voltage regulated.
Battery temperature and charge state are fully
monitored for fault conditions. In the event of an
over-voltage or over-temperature failure, the
— Reverse Blocking Diode
— Current Sensing
• Automatic Recharge Sequencing
• Charge Reduction Loop for USB Charging
• Battery Temperature Monitoring
• Full Battery Charge Auto Turn-Off
• Over-Voltage Protection
• Emergency Thermal Protection
• Power On Reset and Soft Start
• Serial Interface Status Reporting
• 12-Pin 3x3mm TDFN Package
device will automatically shut down, thus protecting
the charging device, control system, and the bat-
tery under charge. Status monitor output pins are
provided to indicate the battery charge status by
Applications
directly driving two external LEDs. A serial interface
output is available to report any one of 14 various •www.DataSheet4U.com Bluetooth™ Headsets
status states to a microcontroller.
• Cellular Telephones
The AAT3688 is available in a Pb-free, thermally-
enhanced, space-saving 12-pin 3x3mm TDFN
package and is rated over the -40°C to +85°C tem-
perature range.
• Digital Still Cameras
• Hand-Held PCs
• MP3 Players
• Personal Data Assistants (PDAs)
• Other Lithium-Ion/Polymer Battery-Powered
Devices
Typical Application
Enable
USB Input
USB Hi/Lo Select
RSETH
USB
USBSEL
USBH
EN CHR
BAT
USBL
TS
RSETL AAT3688
GND
STAT1
DATA
STAT2
BATT+
C2
10μF
BATT-
TEMP
Battery Pack
Serial Data
3688.2006.10.1.5
1
1 page  
AAT3688
USB Port 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
Logic Control / Protection
VUSBSEL(H)
VUSBSEL(L)
VEN(H)
VEN(L)
VSTAT
ISTAT
VOVP
Input High Threshold
Input Low Threshold
Input High Threshold
Input Low Threshold
Output Low Voltage
STAT Pin Current Sink Capability
Over-Voltage Protection Threshold
ITK/ICHG Pre-Charge Current
ITERM/ICHG
ITERM/ICHG
ITS
Charge Termination Threshold Current
Charge Termination Threshold Current
Current Source from TS Pin
TS1 TS Hot Temperature Fault
TS2
I_DATA
VDATA(H)
VDATA)(L)
SQPULSE
tPERIOD
fDATA
TOVSD
TS Cold Temperature Fault
DATA Pin Sink Current
Input High Threshold
Input Low Threshold
Status Request Pulse Width
System Clock Period
Data Output Frequency
Over-Temperature Shutdown Threshold
Conditions
Min Typ Max Units
STAT Pin Sinks 4mA
For USBH Mode
For USBL Mode
For USBH Mode
For USBL Mode
Threshold
Hysteresis
Threshold
Hysteresis
DATA Pin is Active Low State
Status Request
1.6
1.6
8.0
4.4
10
50
7.5
35
70 80
310 330
15
2.2 2.3
10
3.0
1.6
200
50
20
145
0.4
0.4
0.4
90
350
2.4
0.4
V
V
V
V
V
mA
V
%
%
%
µA
mV
V
mV
mA
V
V
ns
µs
kHz
°C
1. The AAT3688 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.
3688.2006.10.1.5
5
5 Page 
AAT3688
USB Port Lithium-Ion/Polymer Battery Charger
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.
Charging Operation
The AAT3688 has four basic modes for the battery
charge cycle and is powered from the USB input:
pre-conditioning/trickle charge; constant current/fast
charge; constant voltage; and end of charge. For ref-
erence, Figure 1 shows the current versus voltage
profile during charging phases.
Battery Preconditioning
Before the start of charging, the AAT3688 checks
several conditions in order to assure a safe charging
environment. The input supply must be above the
minimum operating voltage, or under-voltage lockout
threshold (VUVLO), for the charging sequence to
begin. In addition, the cell temperature, as reported
by a thermistor connected to the TS pin from the bat-
tery, 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 AAT3688
checks the state of the battery. If the cell voltage is
below the Preconditioning Voltage Threshold (VMIN),
the AAT3688 begins preconditioning the cell.
The battery preconditioning trickle charge current
is equal to the fast charge constant current divided
by 10. For example, if the programmed fast charge
current is 500mA, then the preconditioning mode
(trickle charge) current will be 50mA. Cell precon-
ditioning is a safety precaution for a deeply dis-
charged battery and also aids in limiting power dis-
sipation in the pass transistor when the voltage
across the device is at the greatest potential.
Fast Charge / Constant Current Charging
Battery cell preconditioning continues until the volt-
age on the BAT pin exceeds the Preconditioning
Voltage Threshold (VMIN). At this point, the AAT3688
3688.2006.10.1.5
begins the constant current fast charging phase.
The fast charge constant current (ICC) amplitude is
determined by the selected charge mode USBH or
USBL and is programmed by the user via the RSETH
and RSETL resistors. The AAT3688 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 output
charge regulation threshold (VBAT) during the con-
stant current, fast charge phase. The regulation
voltage level is factory programmed to 4.2V ( 1%).
The charge current in the constant voltage mode
drops as the battery cell under charge reaches its
maximum capacity.
End of Charge Cycle Termination and Recharge
Sequence
When the charge current drops to 7.5% of the pro-
grammed fast charge current level in the constant volt-
age mode, the device terminates charging and goes
into a sleep state. The charger will remain in a sleep
state until the battery voltage decreases to a level
below the battery recharge voltage threshold (VRCH).
When the input supply is disconnected, the charg-
er will also automatically enter power-saving sleep
mode. Only consuming an ultra-low 0.3µA in sleep
mode, the AAT3688 minimizes battery drain when
it is not charging. This feature is particularly useful
in applications where the input supply level may fall
below the battery charge or under-voltage lockout
level. In such cases where the AAT3688 input volt-
age drops, the device will enter the sleep mode and
automatically resume charging once the input sup-
ply has recovered from its fault condition.
11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet AAT3688.PDF ] | |
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