View AAT8635_1134325.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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 3.0A ..............Supply Current (Typical) 0.6A ..............Standby Current * High Withstand Voltage Absolute Maximum Ratings..22V ( VDD - VN )
GENERAL DESCRIPTION
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 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
* 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 PIN CONFIGURATION
DOUT
GND
VN
VDD
COUT
Cext
- xAEWAniN/|-1/2q - - Advanced Analog Technology, Inc. -
Page 1 of 17 V 2.0
Advanced Analog Technology, Inc.
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 k , 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
VDD
C ext
COUT
GND
D OUT
VN
- xAEWAniN/|-1/2q - - Advanced Analog Technology, Inc. -
Page 2 of 17 V 2.0
Advanced Analog Technology, Inc.
AAT8635 Series
PIN DESCRIPTION
Pin No. Symbol D OUT Description
1 2 3 4 5 6
Output of Over-Discharge Detection Pin for Charger Negative Input Output of Over-Charge Detection Pin for External Capacitor Setting COM1 Delay Time Power Supply Ground
VN C OUT C ext VDD GND
TYPICAL APPLICATION
+
R1 100
C1 0.1F C ext
VDD
C3 0.01F
VN GND D OUT
C OUT
C2 0.1F
R2 1k
-
- xAEWAniN/|-1/2q - - Advanced Analog Technology, Inc. -
Page 3 of 17 V 2.0
Advanced Analog Technology, Inc.
AAT8635 Series
ABSOLUTE MAXIMUM RATINGS
Symbol VDD Item Rating Unit
- 0.3 to 12 VDD - 22 to VDD +0.3
Supply Voltage Input Voltage Output Voltage VN Pin C ext Pin C OUT Pin D OUT Pin
V V V V V mW J
J
VN VCext VCout VDout Pd TC
Tstorage , Tj
GND - 0.3 to VDD +0.3 VDD - 22 to VDD +0.3 GND - 0.3 to VDD +0.3 160
- 40 to +85 - 50 to +120
Power Dissipation Operating Temperature Range
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.
- xAEWAniN/|-1/2q - - Advanced Analog Technology, Inc. -
Page 4 of 17 V 2.0
Advanced Analog Technology, Inc.
AAT8635 Series
ELECTRICAL CHARACTERISTICS
*AAT8635A Symbol Item Conditions Min Typ
Toper =25J
Max
Unit
VDD1 Operating Input Voltage VC1 Over Charge Threshold Voltage
Voltage Defined as VDD - GND Detect Rising Edge of Supply Voltage
1.5 4.30 0.15 4.35 0.20 75 2.50 10 0.20 13
10.0 4.40 0.25 145 2.58 20 0.23 35
V V V ms V ms V ms V
s
VHYS Over Charge Threshold Hysteresis Range t C1 VD1 t D1 VOC t OC Over Charge Delay Time Over Discharge Threshold Voltage Over Discharge Delay Time Over Current Detection Voltage Over Current Detection Delay Time C 3 = 0.01F , VDD =3.6V to 4.4V Detect Falling Edge of Supply Voltage VDD =3.6V to 2.4V Detect Rising Edge of VN Pin Voltage VDD =3.0V
40 2.42 4 0.17 6
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 VOH1 Pch ON Voltage of C OUT VOL 2 Nch ON Voltage of D OUT VOH 2 Pch ON Voltage of D OUT I DD Supply Current
Is tan dby Standby Current
VDD - 1.2 VDD - 0.9 VDD - 0.6 5 50 100 0.35 3.4 3.4 3.7 0.2 3.7 3.0 7.0 0.6 0.5 50 150 0.50
VDD =3.0V VDD =3.6V, VN=1.0V I OL =50 A , VDD =4.4V I OH = - 50 A , VDD =3.9V I OL =50 A , VDD =2.4V I OH = - 50 A , VDD =3.9V VDD =3.9V,VN =0V VDD =2.0V
k
V V V V
A A
- xAEWAniN/|-1/2q - - Advanced Analog Technology, Inc. -
Page 5 of 17 V 2.0
Advanced Analog Technology, Inc.
AAT8635 Series
ELECTRICAL CHARACTERISTICS
*AAT8635B Symbol Item Conditions Min Typ
Toper =25J
Max
Unit
VDD1 Operating Input Voltage VC1 Over Charge Threshold Voltage
Voltage Defined as VDD - GND Detect Rising Edge of Supply Voltage
1.5 4.23 0.15 4.28 0.20 75 2.50 10 0.20 13
10.0 4.33 0.25 145 2.58 20 0.23 35
V V V ms V ms V ms V
s
VHYS Over Charge Threshold Hysteresis Range t C1 VD1 t D1 VOC t OC Over Charge Delay Time Over Discharge Threshold Voltage Over Discharge Delay Time Over Current Detection Voltage Over Current Detection Delay Time C 3 = 0.01F , VDD =3.6V to 4.4V Detect Falling Edge of Supply Voltage VDD =3.6V to 2.4V Detect Rising Edge of VN Pin Voltage VDD =3.0V
40 2.42 4 0.17 6
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 VOH1 Pch ON Voltage of C OUT VOL 2 Nch ON Voltage of D OUT VOH 2 Pch ON Voltage of D OUT I DD Supply Current
Is tan dby Standby Current
VDD - 1.2 VDD - 0.9 VDD - 0.6 5 50 100 0.35 3.4 3.4 3.7 0.2 3.7 3.0 7.0 0.6 0.5 50 150 0.50
VDD =3.0V VDD =3.6V, VN=1.0V I OL =50 A , VDD =4.4V I OH = - 50 A , VDD =3.9V I OL =50 A , VDD =2.4V I OH = - 50 A , VDD =3.9V VDD =3.9V,VN =0V VDD =2.0V
k
V V V V
A A
- xAEWAniN/|-1/2q - - Advanced Analog Technology, Inc. -
Page 6 of 17 V 2.0
Advanced Analog Technology, Inc.
AAT8635 Series
ELECTRICAL CHARACTERISTICS
*AAT8635C Symbol Item Conditions Min Typ
Toper =25J
Max
Unit
VDD1 Operating Input Voltage VC1 Over Charge Threshold Voltage
Voltage Defined as VDD - GND Detect Rising Edge of Supply Voltage
1.5 4.27 0.15 4.32 0.20 75 2.50 10 0.20 13
10.0 4.37 0.25 145 2.58 20 0.23 35
V V V ms V ms V ms V
s
VHYS Over Charge Threshold Hysteresis Range t C1 VD1 t D1 VOC t OC Over Charge Delay Time Over Discharge Threshold Voltage Over Discharge Delay Time Over Current Detection Voltage Over Current Detection Delay Time C 3 = 0.01F , VDD =3.6V to 4.4V Detect Falling Edge of Supply Voltage VDD =3.6V to 2.4V Detect Rising Edge of VN Pin Voltage VDD =3.0V
40 2.42 4 0.17 6
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 VOH1 Pch ON Voltage of C OUT VOL 2 Nch ON Voltage of D OUT VOH 2 Pch ON Voltage of D OUT I DD Supply Current
Is tan dby Standby Current
VDD - 1.2 VDD - 0.9 VDD - 0.6 5 50 100 0.35 3.4 3.4 3.7 0.2 3.7 3.0 7.0 0.6 0.5 50 150 0.50
VDD =3.0V VDD =3.6V, VN=1.0V I OL =50 A , VDD =4.4V I OH = - 50 A , VDD =3.9V I OL =50 A , VDD =2.4V I OH = - 50 A , VDD =3.9V VDD =3.9V,VN =0V VDD =2.0V
k
V V V V
A A
- xAEWAniN/|-1/2q - - Advanced Analog Technology, Inc. -
Page 7 of 17 V 2.0
Advanced Analog Technology, Inc.
AAT8635 Series
ELECTRICAL CHARACTERISTICS
*AAT8635D Symbol Item Conditions Min Typ
Toper =25J
Max
Unit
VDD1 Operating Input Voltage VC1 Over Charge Threshold Voltage
Voltage Defined as VDD - GND Detect Rising Edge of Supply Voltage
1.5 4.25 0.15 4.30 0.20 75 2.50 10 0.20 13
10.0 4.35 0.25 145 2.58 20 0.23 35
V V V ms V ms V ms V
s
VHYS Over Charge Threshold Hysteresis Range t C1 VD1 t D1 VOC t OC Over Charge Delay Time Over Discharge Threshold Voltage Over Discharge Delay Time Over Current Detection Voltage Over Current Detection Delay Time C 3 = 0.01F , VDD =3.6V to 4.4V Detect Falling Edge of Supply Voltage VDD =3.6V to 2.4V Detect Rising Edge of VN Pin Voltage VDD =3.0V
40 2.42 4 0.17 6
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 VOH1 Pch ON Voltage of C OUT VOL 2 Nch ON Voltage of D OUT VOH 2 Pch ON Voltage of D OUT I DD Supply Current
Is tan dby Standby Current
VDD - 1.2 VDD - 0.9 VDD - 0.6 5 50 100 0.35 3.4 3.4 3.7 0.2 3.7 3.0 7.0 0.6 0.5 50 150 0.50
VDD =3.0V VDD =3.6V, VN=1.0V I OL =50 A , VDD =4.4V I OH = - 50 A , VDD =3.9V I OL =50 A , VDD =2.4V I OH = - 50 A , VDD =3.9V VDD =3.9V,VN =0V VDD =2.0V
k
V V V V
A A
- xAEWAniN/|-1/2q - - Advanced Analog Technology, Inc. -
Page 8 of 17 V 2.0
Advanced Analog Technology, Inc.
AAT8635 Series
TIMING DIAGRAM
*AAT8635 SERIES
Charging Discharging Over Short Current Circuit Charging Charging Discharging Open Open
VC1
VDD
VC1-VHYS VD1
VDD
VN
Vshort
VOC
GND
tC1
VDD
C OUT
VN
tD1
VDD
tD1
tOC tshort
D OUT
GND
Charging Current
Charging/ Discharging Current Discharging Current
Time
- xAEWAniN/|-1/2q - - Advanced Analog Technology, Inc. -
Page 9 of 17 V 2.0
Advanced Analog Technology, Inc.
AAT8635 Series
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:
C 3 x (VDD - 0.7 ) 0.48 x 10 - 6
t C1 =
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.
- xAEWAniN/|-1/2q - - Advanced Analog Technology, Inc. -
Page 10 of 17 V 2.0
Advanced Analog Technology, Inc.
AAT8635 Series
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.
- xAEWAniN/|-1/2q - - Advanced Analog Technology, Inc. -
Page 11 of 17 V 2.0
Advanced Analog Technology, Inc.
AAT8635 Series
PACKAGE DIMENSION
- xAEWAniN/|-1/2q - - Advanced Analog Technology, Inc. -
Page 12 of 17 V 2.0
Advanced Analog Technology, Inc.
AAT8635 Series
PACKAGE DIMENSION (CONT.)
VARIATION (ALL DIMENSIONS SHOWN IN MILLIMETERS) SYMBOL MIN TYP ----------MAX
A A1 A2 b c D E E1 e e1 L L1 L2 R R1
1
NOTE:
-----------
1.45 0.15 1.30 0.50 0.22
0.90 0.30 0.08
1.15
-----------
2.90 BSC 2.80 BSC 1.60 BSC 0.95 BSC 1.90 BSC 0.30 0.45 0.60 REF 0.25 BSC 0.10 0.10 0
o
0.60
----------4 10o
o
------
0.25 8o 15 o
5o
1 JEDEC OUTLINE: MO-178 AB
- xAEWAniN/|-1/2q - - Advanced Analog Technology, Inc. -
Page 13 of 17 V 2.0
Advanced Analog Technology, Inc.
AAT8635 Series
TAPE AND REEL
- xAEWAniN/|-1/2q - - Advanced Analog Technology, Inc. -
Page 14 of 17 V 2.0
Advanced Analog Technology, Inc.
AAT8635 Series
TAPE AND REEL (CONT.)
X.XXX X X.XXX X.XX X.X X
0.0025 0.006
0.025 0.10 0.25
UNIT: MILLIMETERS
- xAEWAniN/|-1/2q - - Advanced Analog Technology, Inc. -
Page 15 of 17 V 2.0
Advanced Analog Technology, Inc.
AAT8635 Series
AAT8635 Versions
Description Over Charge Threshold Voltage ( VC1 ) Over Discharge Threshold Voltage ( VD1 ) Over Current Detection Voltage ( VOC )
8635A 4.35V 2.50V 0.20V
8635 B 4.28V 2.50V 0.20V
8635 C 4.32V 2.50V 0.20V
8635D 4.30V 2.50V 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.
- xAEWAniN/|-1/2q - - Advanced Analog Technology, Inc. -
Page 16 of 17 V 2.0
Advanced Analog Technology, Inc.
AAT8635 Series
ORDERING INFORMATION
- xAEWAniN/|-1/2q - - Advanced Analog Technology, Inc. -
Page 17 of 17 V 2.0

▲Up To Search▲

Price & Availability of AAT8635

	To Download AAT8635 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .