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PDF AAT8635 Data sheet ( Hoja de datos )
| Número de pieza | AAT8635 | |
| Descripción | ONE-CELL LI-ION BATTERY PROTECTION IC | |
| Fabricantes | AAT | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AAT8635 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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Advanced Analog Technology, Inc.
Details are subject to change without notice
AAT8635 Series
ONE-CELL LI-ION BATTERY PROTECTION IC
FEATURES
GENERAL DESCRIPTION
• Ideal for One-Cell Rechargeable Li-Ion Battery
The AAT8635 series are protection ICs designed
Pack.
to safeguard one-cell rechargeable Li-Ion battery
• Low Current Consumption
3.0µA …………..Supply Current (Typical)
0.6µA …………..Standby Current
pack against over charge, over discharge, over
current, and short circuit. The AAT8635 series
use advanced high voltage CMOS process to
• High Withstand Voltage
Absolute Maximum Ratings..22V ( VDD − VN )
• High Accuracy Voltage Detection
provide high accuracy voltage detection and low
current consumption.
The AAT8635 series incorporate a reference unit
Over Charge Detector…………... ± 50mV
and three voltage detectors. During the charging
Over Discharge Detector………. ± 3.2%
process, when the cell voltage ( VDD ) is charged to
• Over Current and Short Circuit Protection
a value higher than the over charge threshold
•
Wide Operating Temperature Range − 40o C
www.DataSheet4U.com
to voltage
( VC1),
the
over
charge
detector
(COM1)
85o C
will switch the output pin ( COUT ) to a low level
• Ultra Small Package……..SOT26
within a delay time ( t C1 ), and thus turning off the
PIN CONFIGURATION
MOSFET connected to the charging path. The
COUT pin may change to high level again when
the VDD voltage falls below “ VC1 − VHYS ”, or
when VDD falls below VC1 while the charger is
disconnected from the battery pack.
DOUT GND During the discharging process, when the VDD
drops to a value lower than the over-discharge
threshold voltage ( VD1 ), the over-discharge
VN VDD detector (COM2) will switch DOUT to low level
within a delay time ( t D1 ), and thus turning off the
COUT Cext MOSFET connecting to the discharging path. In
the mean time, the AAT8635 series will enter a
low current standby mode. Once into standby
mode, the systems can only be released from
––
– Advanced Analog Technology, Inc. –
Page 1 of 17
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Advanced Analog Technology, Inc.
AAT8635 Series
ELECTRICAL CHARACTERISTICS
•AAT8635A
Toper =25
Symbol
Item
Conditions
Min Typ Max Unit
VDD1 Operating Input Voltage
Voltage Defined as
VDD − GND
1.5
10.0 V
VC1
Detect Rising Edge of Supply
Over Charge Threshold Voltage
4.30
4.35
4.40 V
Voltage
VHYS Over Charge Threshold
Hysteresis Range
t C1 Over Charge Delay Time
0.15 0.20 0.25 V
C3 = 0.01µF , VDD =3.6V to
4.4V
40
75 145 ms
VD1 Over Discharge Threshold
Voltage
t D1 Over Discharge Delay Time
Detect Falling Edge of
Supply Voltage
VDD =3.6V to 2.4V
2.42 2.50 2.58 V
4 10 20 ms
VOC Over Current Detection
Voltage
Detect Rising Edge of VN
0.17 0.20 0.23 V
Pin Voltage
t OC Over Current Detection Delay VDD =3.0V
Time
Vshort Short Circuit Detection Voltage VDD =3.0V
6 13 35 ms
VDD − 1.2 VDD − 0.9 VDD − 0.6 V
tshort Short Circuit Detection Delay VDD =3.0V
Time
5 50 µs
Rshort Reset Resistance for Over
Current Protection
VOL1 Nch ON Voltage of COUT
VOH1 Pch ON Voltage of COUT
VOL2 Nch ON Voltage of DOUT
VOH2 Pch ON Voltage of DOUT
IDD Supply Current
Is tan dby Standby Current
VDD =3.6V, VN=1.0V
IOL =50 µA , VDD =4.4V
IOH = − 50 µA , VDD =3.9V
IOL =50 µA , VDD =2.4V
IOH = − 50 µA , VDD =3.9V
VDD =3.9V,VN =0V
VDD =2.0V
50
3.4
3.4
100 150 kΩ
0.35 0.50 V
3.7 V
0.2 0.5 V
3.7 V
3.0 7.0 µA
0.6 µA
––
– Advanced Analog Technology, Inc. –
Page 5 of 17
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Advanced Analog Technology, Inc.
OPERATION (CONT.)
AAT8635 Series
3. COM2 (Over Discharge Detector)
COM2 monitors the cell voltage at the VDD pin. When VDD drops below the over discharge threshold VD1 during the
discharging process, COM1 detects an over charging condition and after delay time ( t D1 ) elapses, the DOUT pin falls to a low
level and thus turning off the external discharge control N-channel MOSFET. As soon as this happens, the VN pin will be changed
to high level by an internal PMOS and the AAT8635 series will enter the standby mode.
Connecting the battery pack to a charger is the required condition for AAT8635 series to recover from standby mode. With the
charger connected, the charge current can flow through the parasitic diode of the external discharge control N-channel MOSFET
while VDD is still lower than the over-discharge threshold. Once VDD is charged up to a value higher than VD1 , the DOUT pin
goes to a high level. This leads to the “ON” state of both the charge and discharge control MOSFETs, and the charging process
proceeds on as long as the charger is connected. Connecting a charger to the battery pack when VDD is already higher than VD1
will make DOUT instantaneously high.
4. COM3 (Over Current Detector, Short Circuit Protector)
The over current detector and short circuit protector function normally when both the charge and discharge control N-channel
MOSFETs are “ON”.
In standard operation, voltage on VN pin will be either slightly higher or lower than GND, depending on the impedance of the two
MOSFETs. However, when the VN pin voltage rises to a value between the short circuit detection voltage Vshort and over current
detection voltage VOC , the AAT8635 series detect an over current condition. As a result, the external discharge control N-channel
MOSFET goes to “OFF” with DOUT pin at the low state. An output delay time for the over current detection is internally fixed. A
quick recovery of VN from a value between Vshort and VOC to the normal value within the delay time keeps the discharge control
FET staying at the “ON” state.
Short circuit may as well be explained as a “serious” over current condition. When the VN pin voltage rises to a value not only
higher than VOC but also higher than Vshort , the short circuit protector will shut down the discharge MOSFET immediately to
protect battery pack from being damaged or exploding.
The VN pin has a built-in pull down resistor. Thus once the factors that cause over current or short circuit is removed, the VN pin
will be pulled down to ground level through the internal resistor. Therefore, with VN lower than the over current and short circuit
protection threshold, DOUT will be turned back on and the AAT8635 series can continue normal charge or discharge operation.
When over current or short circuit occurs, the AAT8635 series will not enter a standby mode.
––
– Advanced Analog Technology, Inc. –
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| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AAT8635.PDF ] | |
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