AAT AAT8635 One-cell li-ion battery protection ic Datasheet

Advanced Analog Technology, Inc.
AAT8635 Series
Details are subject to change without notice
ONE-CELL LI-ION BATTERY PROTECTION IC
FEATURES
• Ideal for One-Cell Rechargeable Li-Ion Battery
Pack.
• Low Current Consumption
3.0µA …………..Supply Current (Typical)
0.6µA …………..Standby Current
• High Withstand Voltage
Absolute Maximum Ratings..22V ( VDD − VN )
• High Accuracy Voltage Detection
Over Charge Detector…………... ± 50mV
Over Discharge Detector………. ± 3.2%
• Over Current and Short Circuit Protection
• Wide Operating Temperature Range − 40 o C to
85 o C
• Ultra Small Package……..SOT26
The AAT8635 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 AAT8635 series
use advanced high voltage CMOS process to
provide high accuracy voltage detection and low
current consumption.
The AAT8635 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 ( C OUT ) to a low level
within a delay time ( t C1 ), and thus turning off the
MOSFET connected to the charging path. The
C OUT 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
PIN CONFIGURATION
DOUT
GENERAL DESCRIPTION
GND
VN
VDD
COUT
Cext
disconnected from the battery pack.
During the discharging process, when the VDD
drops to a value lower than the over-discharge
threshold voltage ( VD1 ), the over-discharge
detector (COM2) will switch D OUT to low level
within a delay time ( t D1 ), and thus turning off the
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
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AAT8635 Series
standby mode right after the battery pack is
connected to a charger.
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, D OUT will be switched to low and the path
is cut-off right after an internally pre-set delay
time ( t OC ) elapses. In the case of short circuit, i.e.
VN rises above Vshort , the path will also be cut-off
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 100 kΩ , will pull VN down to GND and
bring the IC back to standard operation.
Together with the application circuit, the
AAT8635 series will function as a consummate
protector, which promotes safe usage and the
sustainability of Li-Ion battery packs.
BLOCK DIAGRAM
C ext
VDD
COUT
GND
D OUT
VN
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AAT8635 Series
PIN DESCRIPTION
Pin No.
1
2
Symbol
D OUT
Description
Output of Over-Discharge Detection
3
VN
C OUT
Pin for Charger Negative Input
Output of Over-Charge Detection
4
C ext
Pin for External Capacitor Setting COM1 Delay Time
5
VDD
Power Supply
6
GND
Ground
TYPICAL APPLICATION
+
R1
100Ω
C1
0.1µF
VDD
C3
0.01µF
C ext
VN
GND
D OUT
C OUT
C2
0.1µF
R2
1kΩ
−
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AAT8635 Series
ABSOLUTE MAXIMUM RATINGS
Symbol
VDD
VN
VCext
VCout
VDout
Item
Rating
Unit
Supply Voltage
− 0.3 to 12
VDD − 22 to VDD +0.3
V
V
C OUT Pin
GND − 0.3 to VDD +0.3
VDD − 22 to VDD +0.3
V
D OUT Pin
GND − 0.3 to VDD +0.3
V
Input Voltage
Output Voltage
VN Pin
C ext Pin
V
Pd
Power Dissipation
160
TC
Operating Temperature Range
− 40 to +85
mW
℃
Tstorage , Tj
Storage and Junction Temperature
− 50 to +120
℃
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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AAT8635 Series
ELECTRICAL CHARACTERISTICS
Toper =25℃
•AAT8635A
Symbol
Item
Conditions
Min
Typ
Max
Unit
10.0
V
VDD1 Operating Input Voltage
Voltage Defined as
VDD − GND
1.5
VC1
Detect Rising Edge of Supply
Voltage
4.30
4.35
4.40
V
0.15
0.20
0.25
V
40
75
145
ms
2.42
2.50
2.58
V
4
10
20
ms
0.17
0.20
0.23
V
6
13
35
ms
Over Charge Threshold Voltage
VHYS Over Charge Threshold
Hysteresis Range
C 3 = 0.01µF , VDD =3.6V to
t C1
Over Charge Delay Time
VD1
Over Discharge Threshold
Voltage
t D1
Over Discharge Delay Time
Detect Falling Edge of
Supply Voltage
VDD =3.6V to 2.4V
VOC
Over Current Detection
Voltage
Detect Rising Edge of VN
Pin Voltage
t OC
Over Current Detection Delay
Time
VDD =3.0V
4.4V
Vshort Short Circuit Detection Voltage VDD =3.0V
t short Short Circuit Detection Delay
Time
R short Reset Resistance for Over
Current Protection
VOL1 Nch ON Voltage of C OUT
VDD =3.6V, VN=1.0V
VOL 2 Nch ON Voltage of D OUT
I OL =50 µA , VDD =2.4V
VOH 2 Pch ON Voltage of D OUT
I OH = − 50 µA , VDD =3.9V
Is tan dby Standby Current
5
50
µs
100
150
kΩ
0.35
0.50
V
50
I OL =50 µA , VDD =4.4V
I OH = − 50 µA , VDD =3.9V
Supply Current
V
VDD =3.0V
VOH1 Pch ON Voltage of C OUT
I DD
VDD − 1.2 VDD − 0.9 VDD − 0.6
3.4
3.7
0.2
3.4
VDD =3.9V,VN =0V
0.5
3.7
3.0
VDD =2.0V
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0.6
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Advanced Analog Technology, Inc.
AAT8635 Series
ELECTRICAL CHARACTERISTICS
Toper =25℃
•AAT8635B
Symbol
Item
Conditions
Min
Typ
Max
Unit
10.0
V
VDD1 Operating Input Voltage
Voltage Defined as
VDD − GND
1.5
VC1
Detect Rising Edge of Supply
Voltage
4.23
4.28
4.33
V
0.15
0.20
0.25
V
40
75
145
ms
2.42
2.50
2.58
V
4
10
20
ms
0.17
0.20
0.23
V
6
13
35
ms
Over Charge Threshold Voltage
VHYS Over Charge Threshold
Hysteresis Range
C 3 = 0.01µF , VDD =3.6V to
t C1
Over Charge Delay Time
VD1
Over Discharge Threshold
Voltage
t D1
Over Discharge Delay Time
VOC
Over Current Detection Voltage
Detect Rising Edge of VN
Pin Voltage
t OC
Over Current Detection Delay
Time
VDD =3.0V
4.4V
Detect Falling Edge of
Supply Voltage
VDD =3.6V to 2.4V
Vshort Short Circuit Detection Voltage VDD =3.0V
t short Short Circuit Detection Delay
Time
R short Reset Resistance for Over
Current Protection
VOL1 Nch ON Voltage of C OUT
VDD =3.6V, VN=1.0V
VOL 2 Nch ON Voltage of D OUT
I OL =50 µA , VDD =2.4V
VOH 2 Pch ON Voltage of D OUT
I OH = − 50 µA , VDD =3.9V
Is tan dby Standby Current
5
50
µs
100
150
kΩ
0.35
0.50
V
50
I OL =50 µA , VDD =4.4V
I OH = − 50 µA , VDD =3.9V
Supply Current
V
VDD =3.0V
VOH1 Pch ON Voltage of C OUT
I DD
VDD − 1.2 VDD − 0.9 VDD − 0.6
3.4
3.7
0.2
3.4
VDD =3.9V,VN =0V
0.5
3.7
3.0
VDD =2.0V
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0.6
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Advanced Analog Technology, Inc.
AAT8635 Series
ELECTRICAL CHARACTERISTICS
Toper =25℃
•AAT8635C
Symbol
Item
Conditions
Min
Typ
Max
Unit
10.0
V
VDD1 Operating Input Voltage
Voltage Defined as
VDD − GND
1.5
VC1
Detect Rising Edge of Supply
Voltage
4.27
4.32
4.37
V
0.15
0.20
0.25
V
40
75
145
ms
2.42
2.50
2.58
V
4
10
20
ms
0.17
0.20
0.23
V
6
13
35
ms
Over Charge Threshold Voltage
VHYS Over Charge Threshold
Hysteresis Range
C 3 = 0.01µF , VDD =3.6V to
t C1
Over Charge Delay Time
VD1
Over Discharge Threshold
Voltage
t D1
Over Discharge Delay Time
Detect Falling Edge of
Supply Voltage
VDD =3.6V to 2.4V
VOC
Over Current Detection
Voltage
Detect Rising Edge of VN
Pin Voltage
t OC
Over Current Detection Delay
Time
VDD =3.0V
4.4V
Vshort Short Circuit Detection Voltage VDD =3.0V
t short Short Circuit Detection Delay
Time
R short Reset Resistance for Over
Current Protection
VOL1 Nch ON Voltage of C OUT
VDD =3.6V, VN=1.0V
VOL 2 Nch ON Voltage of D OUT
I OL =50 µA , VDD =2.4V
VOH 2 Pch ON Voltage of D OUT
I OH = − 50 µA , VDD =3.9V
Is tan dby Standby Current
5
50
µs
100
150
kΩ
0.35
0.50
V
50
I OL =50 µA , VDD =4.4V
I OH = − 50 µA , VDD =3.9V
Supply Current
V
VDD =3.0V
VOH1 Pch ON Voltage of C OUT
I DD
VDD − 1.2 VDD − 0.9 VDD − 0.6
3.4
3.7
0.2
3.4
VDD =3.9V,VN =0V
0.5
3.7
3.0
VDD =2.0V
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0.6
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Advanced Analog Technology, Inc.
AAT8635 Series
ELECTRICAL CHARACTERISTICS
Toper =25℃
•AAT8635D
Symbol
Item
Conditions
Min
Typ
Max
Unit
10.0
V
VDD1 Operating Input Voltage
Voltage Defined as
VDD − GND
1.5
VC1
Detect Rising Edge of Supply
Voltage
4.25
4.30
4.35
V
0.15
0.20
0.25
V
40
75
145
ms
2.42
2.50
2.58
V
4
10
20
ms
0.17
0.20
0.23
V
6
13
35
ms
Over Charge Threshold Voltage
VHYS Over Charge Threshold
Hysteresis Range
C 3 = 0.01µF , VDD =3.6V to
t C1
Over Charge Delay Time
VD1
Over Discharge Threshold
Voltage
t D1
Over Discharge Delay Time
Detect Falling Edge of
Supply Voltage
VDD =3.6V to 2.4V
VOC
Over Current Detection
Voltage
Detect Rising Edge of VN
Pin Voltage
t OC
Over Current Detection Delay
Time
VDD =3.0V
4.4V
Vshort Short Circuit Detection Voltage VDD =3.0V
t short Short Circuit Detection Delay
Time
R short Reset Resistance for Over
Current Protection
VOL1 Nch ON Voltage of C OUT
VDD =3.6V, VN=1.0V
VOL 2 Nch ON Voltage of D OUT
I OL =50 µA , VDD =2.4V
VOH 2 Pch ON Voltage of D OUT
I OH = − 50 µA , VDD =3.9V
Is tan dby Standby Current
5
50
µs
100
150
kΩ
0.35
0.50
V
50
I OL =50 µA , VDD =4.4V
I OH = − 50 µA , VDD =3.9V
Supply Current
V
VDD =3.0V
VOH1 Pch ON Voltage of C OUT
I DD
VDD − 1.2 VDD − 0.9 VDD − 0.6
3.4
3.7
0.2
3.4
VDD =3.9V,VN =0V
0.5
3.7
3.0
VDD =2.0V
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AAT8635 Series
TIMING DIAGRAM
Over
Short
Current Circuit
•AAT8635 SERIES
Charging
Discharging
Charging
Charging
Discharging
Open
Open
VC1
VDD
VC1-VHYS
VD1
VDD
Vshort
VN
VOC
GND
tC1
VDD
C OUT
VN
tD1
tD1
tOC tshort
VDD
D OUT
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 ( t C1 ), when the voltage at VDD exceeds the over charge detector threshold VC1 . Under this condition,
C OUT 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 C OUT pin to drive the low level of C OUT to be equal to the VN pin voltage. Furthermore,
the high level of C OUT is set to be equivalent to VDD .
The over charge delay time t C1 of over charging is determined by the external capacitor C 3 connected between the GND and
C ext pin. The delay time t C1 can be estimated as the following:
t C1 =
C 3 x (VDD − 0.7 )
0.48 x 10 − 6
However, if the duration of the over charge condition is not long enough to cover the time delay window, C OUT 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 COM1means C OUT
returns to high level again and the charging path is reconnected to restart charging process, one of the conditions to reset COM1
is when V DD falls to lower than “ VC1 − VHYS ” as a result of battery cell internal discharge. Disconnecting the battery pack from
the charger can also reset COM1 even when VDD is still within the hysteresis window ( VC1 − VHYS ≤ VDD < VC1 ).
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 VDD drops below VC1 , C OUT will change to high level.
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OPERATION (CONT.)
3. COM2 (Over Discharge Detector)
COM2 monitors the cell voltage at the V DD 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 D OUT 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 V DD is still lower than the over-discharge threshold. Once V DD is charged up to a value higher than VD1 , the D OUT 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 V DD is already higher than VD1
will make D OUT 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 D OUT 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, D OUT 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.
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AAT8635 Series
PACKAGE DIMENSION
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AAT8635 Series
PACKAGE DIMENSION (CONT.)
VARIATION (ALL DIMENSIONS SHOWN IN MILLIMETERS)
SYMBOL MIN
TYP
MAX
A
------
------
1.45
A1
------
------
0.15
A2
0.90
1.15
1.30
b
0.30
------
0.50
c
0.08
------
0.22
D
2.90 BSC
E
2.80 BSC
E1
1.60 BSC
e
0.95 BSC
e1
1.90 BSC
L
0.30
0.45
L1
0.60 REF
L2
0.25 BSC
0.60
R
0.10
------
------
R1
0.10
------
0.25
θ
0
θ1
5o
o
o
4
10o
8o
15 o
NOTE:
1 JEDEC OUTLINE: MO-178 AB
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TAPE AND REEL
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AAT8635 Series
TAPE AND REEL (CONT.)
X.XXX X
± 0.0025
X.XXX
± 0.006
X.XX
± 0.025
X.X
± 0.10
X
± 0.25
UNIT: MILLIMETERS
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AAT8635 Series
AAT8635 Versions
Description
8635A
8635 B
8635 C
8635D
Over Charge Threshold Voltage
( VC1 )
4.35V
4.28V
4.32V
4.30V
Over Discharge Threshold
Voltage ( VD1 )
2.50V
2.50V
2.50V
2.50V
Over Current Detection Voltage
( VOC )
0.20V
0.20V
0.20V
0.20V
PART MARKING
PREVIOUS TOP MAKING
AXXX
AXX
NEW TOP MARKING
BXX
Note:
1. Starting from January 2004, mass production products bear the new top marking presented above.
2. SOT-23-6 has no back marking.
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AAT8635 Series
ORDERING INFORMATION
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