AAT8636 [AAT]
ONE-CELL LI-ION BATTERY PROTECTION IC; 单节锂离子电池保护IC
| 型号： | AAT8636 |
| 厂家： | 
ADVANCED ANALOG TECHNOLOGY, INC. |
| 描述： | ONE-CELL LI-ION BATTERY PROTECTION IC |
| 文件： | 总16页 (文件大小：162K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Advanced Analog Technology, Inc.
Details are subject to change without notice
ONE-CELL LI-ION BATTERY PROTECTION IC
FEATURES
GENERAL DESCRIPTION
• Ideal for One-Cell Rechargeable Li-Ion Battery
The AAT8636 series are protection ICs designed
to safeguard one-cell rechargeable Li-Ion battery
pack against over charge, over discharge, over
current, and short circuit. The AAT8636 series
use advanced high voltage CMOS process to
provide high accuracy voltage detection and low
current consumption.
Pack.
• Low Current Consumption
3.0µA …………..Supply Current (Typical)
0.1µA …………..Standby Current
• High Withstand Voltage
Absolute Maximum Ratings..22V (VDD − VN )
• High Accuracy Voltage Detection
Over Charge Detector…………... ± 20mV
Over Discharge Detector………. ± 2.5%
• Over Current and Short Circuit Protection
• Wide Operating Temperature Range− 40o C to
85o C
The AAT8636 series incorporate a reference unit
and three voltage detectors. During the charging
process, when the cell voltage ( VDD ) is charged to
a value higher than the over charge threshold
voltage (VC1), the over charge detector (COM1)
will switch the output pin (COUT ) to a low level
within a delay time ( tC1 ), and thus turning off the
• Ultra Small Package……..SOT26
MOSFET connected to the charging path. The
COUT pin may change to high level again when
PIN CONFIGURATION
the VDD voltage falls below “ VC1 − VHYS ”, or
when VDD falls below VC1 while the charger is
disconnected from the battery pack.
During the discharging process, when the VDD
DOUT
GND
drops to a value lower than the over-discharge
threshold voltage ( VD1 ), the over-discharge
detector (COM2) will switch DOUT to low level
VDD
VN
within a delay time ( tD1 ), and thus turning off the
Cext
COUT
MOSFET connecting to the discharging path. In
the mean time, the AAT8636 series will enter a
low current standby mode. Once into standby
mode, the systems can only be released from
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VN rises aboveVshort , the path will also be cut-off
standby mode right after the battery pack is
connected to a charger.
but with almost no delay time. Once the over
current or factors contributing to short circuit is
removed, the built-in resistor at the VN pin,
typically 100kΩ , will pull VN down to GND and
bring the IC back to standard operation.
The conditions of over current and short circuit
protection are both determined by the voltage at
the VN pin. As the voltage of VN pin reaches a
value higher than VOC , which indicates an
undesirable large current is flowing through the
path, DOUT will be switched to low and the path
Together with the application circuit, the
AAT8636 series will function as a consummate
protector, which promotes safe usage and the
sustainability of Li-Ion battery packs.
is cut-off right after an internally pre-set delay
time ( tOC ) elapses. In the case of short circuit, i.e.
BLOCK DIAGRAM
Cext
VDD
COUT
GND
VN
DOUT
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PIN DESCRIPTION
Pin No. Symbol
Description
Output of Over-Discharge Detection
DOUT
1
2
3
4
5
6
VN
Pin for Charger Negative Input
Output of Over-Charge Detection
Pin for External Capacitor Setting COM1 Delay Time
Power Supply
COUT
Cext
VDD
GND
Ground
TYPICAL APPLICATION
+
R1
100Ω
C1
0.1µF
VDD
Cext
C3
VN
0.01µF
GND
DOUT
COUT
C2
0.1µF
R2
1kΩ
−
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ABSOLUTE MAXIMUM RATINGS
Symbol
VDD
Item
Rating
Unit
V
Supply Voltage
− 0.3 to 12
V
DD − 22 to VDD +0.3
VN
VCext
VN Pin
V
Input Voltage
Cext Pin
COUT Pin
DOUT Pin
GND − 0.3 to VDD +0.3
V
VCout
VDout
Pd
VDD − 22 to VDD +0.3
V
Output Voltage
GND − 0.3 to VDD +0.3
V
Power Dissipation
160
mW
℃
℃
TC
Operating Temperature Range
− 40 to +85
−50 to +120
Tstorage , T
j
Storage and Junction Temperature
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. Exposure to absolute maximum rating conditions for extended period of time may affect device
reliability.
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ELECTRICAL CHARACTERISTICS
•AAT8636A
Toper =25℃
Symbol
Item
Conditions
Min
Typ
Max
Unit
Voltage Defined as
VDD1
VC1
Operating Input Voltage
1.5
10.0
V
VDD − GND
Detect Rising Edge of Supply
Voltage
Over Charge Threshold Voltage
4.33
0.15
60
4.35
0.20
75
4.37
0.25
90
V
V
Over Charge Threshold
Hysteresis Range
VHYS
tC1
C3 = 0.01µF , VDD =3.6V to
Over Charge Delay Time
ms
4.4V
Over Discharge Threshold
Voltage
Detect Falling Edge of
Supply Voltage
VDD =3.6V to 2.4V
VD1
tD1
2.437
7
2.500
10
2.563
13
V
ms
V
Over Discharge Delay Time
Over Current Detection
Voltage
Detect Rising Edge of VN
Pin Voltage
VOC
0.17
0.20
0.23
Over Current Detection Delay
Time
tOC
VDD =3.0V
VDD =3.0V
VDD =3.0V
9
13
17
ms
V
VDD −1.2 VDD − 0.9 VDD − 0.6
short Short Circuit Detection Voltage
V
Short Circuit Detection Delay
t
µs
short
5
50
Time
Reset Resistance for Over
R
VDD =3.6V, VN=1.0V
short
50
100
150
kΩ
Current Protection
VOL1 Nch ON Voltage of COUT
VOH1 Pch ON Voltage ofCOUT
VOL2 Nch ON Voltage of DOUT
VOH2 Pch ON Voltage of DOUT
IOL =50µA , VDD =4.4V
IOH =− 50 µA , VDD =3.9V
IOL =50µA , VDD =2.4V
IOH =− 50 µA , VDD =3.9V
VDD =3.9V,VN =0V
VDD =2.0V
0.35
3.7
0.2
3.7
3.0
0.50
V
V
V
3.4
3.4
0.5
V
IDD
µA
Supply Current
Standby Current
5.0
0.1
Is tandby
µA
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ELECTRICAL CHARACTERISTICS
•AAT8636B
Toper =25℃
Symbol
Item
Conditions
Min
Typ
Max
Unit
Voltage Defined as
VDD1
VC1
Operating Input Voltage
1.5
10.0
V
VDD − GND
Detect Rising Edge of Supply
Voltage
Over Charge Threshold Voltage
4.26
0.15
60
4.28
0.20
75
4.30
0.25
90
V
V
Over Charge Threshold
Hysteresis Range
VHYS
tC1
C3 = 0.01µF , VDD =3.6V to
Over Charge Delay Time
ms
4.4V
Over Discharge Threshold
Voltage
Detect Falling Edge of
Supply Voltage
VDD =3.6V to 2.4V
VD1
tD1
2.437
7
2.500
10
2.563
13
V
ms
V
Over Discharge Delay Time
Detect Rising Edge of VN
Pin Voltage
VOC
Over Current Detection Voltage
0.17
0.20
0.23
Over Current Detection Delay
Time
tOC
VDD =3.0V
VDD =3.0V
VDD =3.0V
9
13
17
ms
V
VDD −1.2 VDD − 0.9 VDD − 0.6
short Short Circuit Detection Voltage
V
Short Circuit Detection Delay
t
µs
short
5
50
Time
Reset Resistance for Over
R
VDD =3.6V, VN=1.0V
short
50
100
150
kΩ
Current Protection
VOL1 Nch ON Voltage of COUT
VOH1 Pch ON Voltage ofCOUT
VOL2 Nch ON Voltage of DOUT
VOH2 Pch ON Voltage of DOUT
IOL =50µA , VDD =4.4V
IOH =− 50 µA , VDD =3.9V
IOL =50µA , VDD =2.4V
IOH =− 50 µA , VDD =3.9V
VDD =3.9V,VN =0V
VDD =2.0V
0.35
3.7
0.2
3.7
3.0
0.50
V
V
V
3.4
3.4
0.5
V
IDD
µA
Supply Current
Standby Current
5.0
0.1
Is tandby
µA
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ELECTRICAL CHARACTERISTICS
•AAT8636C
Toper =25℃
Symbol
Item
Conditions
Min
Typ
Max
Unit
Voltage Defined as
VDD1
VC1
Operating Input Voltage
1.5
10.0
V
VDD − GND
Detect Rising Edge of Supply
Voltage
Over Charge Threshold Voltage
4.30
0.15
60
4.32
0.20
75
4.34
0.25
90
V
V
Over Charge Threshold
Hysteresis Range
VHYS
tC1
C3 = 0.01µF , VDD =3.6V to
Over Charge Delay Time
ms
4.4V
Over Discharge Threshold
Voltage
Detect Falling Edge of
Supply Voltage
VDD =3.6V to 2.4V
VD1
tD1
2.437
7
2.500
10
2.563
13
V
ms
V
Over Discharge Delay Time
Over Current Detection
Voltage
Detect Rising Edge of VN
Pin Voltage
VOC
0.17
0.20
0.23
Over Current Detection Delay
Time
tOC
VDD =3.0V
VDD =3.0V
VDD =3.0V
9
13
17
ms
V
VDD −1.2 VDD − 0.9 VDD − 0.6
short Short Circuit Detection Voltage
V
Short Circuit Detection Delay
t
µs
short
5
50
Time
Reset Resistance for Over
Rshort
VDD =3.6V, VN=1.0V
50
100
150
kΩ
Current Protection
VOL1 Nch ON Voltage of COUT
VOH1 Pch ON Voltage ofCOUT
VOL2 Nch ON Voltage of DOUT
VOH2 Pch ON Voltage of DOUT
IOL =50µA , VDD =4.4V
IOH =− 50 µA , VDD =3.9V
IOL =50µA , VDD =2.4V
IOH =− 50 µA , VDD =3.9V
VDD =3.9V,VN =0V
VDD =2.0V
0.35
3.7
0.2
3.7
3.0
0.50
V
V
V
3.4
3.4
0.5
V
IDD
µA
Supply Current
Standby Current
5.0
0.1
Is tandby
µA
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TIMING DIAGRAM
•AAT8636 SERIES
Charging
Over
Current Circuit
Short
Charging
Charging
Open
Open
Discharging
Discharging
VC1
VC1-VHYS
VDD
VD1
VDD
Vshort
VN
VOC
GND
tC1
VDD
COUT
VN
tD1
tD1
tOC tshort
VDD
DOUT
GND
Charging
Current
Charging/
Discharging
Current
Discharging
Current
Time
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OPERATION
1. COM1 (Over-Charge Detector)
COM1 is the monitor of the voltage at the VDD pin. COM1 senses an over charging condition and if this condition continues
longer than the delay time ( tC1 ), when the voltage at VDD exceeds the over charge detector threshold VC1 . Under this condition,
COUT pin falls to a low level and thus turns off the external charge control N-channel MOSFET. An internal level shifter is
incorporated in the buffer driver at the COUT pin to drive the low level of COUT to be equal to the VN pin voltage. Furthermore,
the high level of COUT is set to be equivalent to VDD
.
The over charge delay time tC1 of over charging is determined by the external capacitor C3 connected between the GND and
Cext pin. The delay time tC1 can be estimated as the following:
C3 x
(
VDD − 0.7
)
tC1
=
0.48 x10−6
However, if the duration of the over charge condition is not long enough to cover the time delay window, COUT will not change to
the low level and the charging process continues.
2. Required Conditions to Reset COM1 from Over Charging
After the MOSFET, the charge control, is turned off, COM1 can be reset under two conditions. As resetting COM1meansCOUT
returns to high level again and the charging path is reconnected to restart charging process, one of the conditions to reset COM1
is when
falls to lower than “ VC1 − VHYS ” as a result of battery cell internal discharge. Disconnecting the battery pack from
VDD
the charger can also reset COM1 even when
is still within the hysteresis window ( VC1 − VHYS ≤ VDD < VC1 ).
VDD
After the battery pack is disconnected from the charger, connecting a system load to the battery pack allows current to flow
through the parasitic diode of external charge control MOSFET. This discharging current will bring VDD down eventually and
once
drops below VC1 , COUT will change to high level.
VDD
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OPERATION (CONT.)
3. COM2 (Over Discharge Detector)
COM2 monitors the cell voltage at the
pin. When
drops below the over discharge threshold VD1 during the
VDD
VDD
discharging process, COM1 detects an over charging condition and after delay time ( tD1 ) 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 AAT8636 series will enter the standby mode.
Connecting the battery pack to a charger is the required condition for AAT8636 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
is still lower than the over-discharge threshold. Once
is charged up to a value higher than VD1 , the DOUT pin
VDD
VDD
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
will make DOUT instantaneously high.
is already higher than VD1
VDD
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 AAT8636 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 AAT8636 series can continue normal charge or discharge operation.
When over current or short circuit occurs, the AAT8636 series will not enter a standby mode.
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PACKAGE DIMENSION
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PACKAGE DIMENSION (CONT.)
VARIATION (ALL DIMENSIONS SHOWN IN MILLIMETERS)
SYMBOL MIN
TYP
------
MAX
1.45
0.15
1.30
0.50
0.22
A
A1
A2
b
------
------
0.90
0.30
0.08
------
1.15
------
c
------
D
2.90 BSC
2.80 BSC
1.60 BSC
0.95 BSC
1.90 BSC
0.45
E
E1
e
e1
L
0.30
0.60
L1
L2
R
0.60 REF
0.25 BSC
------
0.10
0.10
0o
------
0.25
8o
R1
θ
------
4o
10o
θ1
5o
15o
NOTE:
1 JEDEC OUTLINE: MO-178 AB
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TAPE AND REEL
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TAPE AND REEL (CONT.)
X.XXX X ± 0.0025
X.XXX
X.XX
X.X
± 0.006
± 0.025
± 0.10
± 0.25
X
UNIT: MILLIMETERS
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AAT8636 Versions
Description
8636A
4.35V
8636 B
4.28V
8636 C
4.32V
Over Charge Threshold Voltage
(VC1)
Over Discharge Threshold
Voltage (VD1 )
2.50V
0.20V
2.50V
0.20V
2.50V
0.20V
Over Current Detection Voltage
(VOC )
PART MARKING
PREVIOUS TOP MAKING
AXXX
NEW TOP MARKING
AXX
NOTE: SOT26 HAS NO BACK MARKING.
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ORDERING INFORMATION
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