Advanced Analog Technology, Inc. AAT8636 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) 0.1µA …………..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 − 40 o C to 85 o C • Ultra Small Package……..SOT26 VN 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. 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 ( 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 D OUT GENERAL DESCRIPTION disconnected from the battery pack. During the discharging process, when the VDD GND 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 COUT C ext 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 – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 1 of 16 V 1.0 Advanced Analog Technology, Inc. AAT8636 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 AAT8636 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 – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 2 of 16 V 1.0 Advanced Analog Technology, Inc. AAT8636 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 − – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 3 of 16 V 1.0 Advanced Analog Technology, Inc. AAT8636 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. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 4 of 16 V 1.0 Advanced Analog Technology, Inc. AAT8636 Series ELECTRICAL CHARACTERISTICS Toper =25℃ •AAT8636A 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 4.33 4.35 4.37 V 0.15 0.20 0.25 V 60 75 90 ms 2.437 2.500 2.563 V 7 10 13 ms 0.17 0.20 0.23 V 9 13 17 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 V 0.2 3.4 VDD =3.9V,VN =0V 0.5 3.7 V 3.0 VDD =2.0V – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 5 of 16 V V 1.0 5.0 µA 0.1 µA Advanced Analog Technology, Inc. AAT8636 Series ELECTRICAL CHARACTERISTICS Toper =25℃ •AAT8636B 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 4.26 4.28 4.30 V 0.15 0.20 0.25 V 60 75 90 ms 2.437 2.500 2.563 V 7 10 13 ms 0.17 0.20 0.23 V 9 13 17 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 V 0.2 3.4 VDD =3.9V,VN =0V 0.5 3.7 V 3.0 VDD =2.0V – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 6 of 16 V V 1.0 5.0 µA 0.1 µA Advanced Analog Technology, Inc. AAT8636 Series ELECTRICAL CHARACTERISTICS Toper =25℃ •AAT8636C 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 4.32 4.34 V 0.15 0.20 0.25 V 60 75 90 ms 2.437 2.500 2.563 V 7 10 13 ms 0.17 0.20 0.23 V 9 13 17 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 V 0.2 3.4 VDD =3.9V,VN =0V 0.5 3.7 V 3.0 VDD =2.0V – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 7 of 16 V V 1.0 5.0 µA 0.1 µA Advanced Analog Technology, Inc. AAT8636 Series TIMING DIAGRAM Over Short Current Circuit •AAT8636 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 – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 8 of 16 V 1.0 Advanced Analog Technology, Inc. AAT8636 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: 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. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 9 of 16 V 1.0 Advanced Analog Technology, Inc. AAT8636 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 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 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 AAT8636 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 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. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 10 of 16 V 1.0 Advanced Analog Technology, Inc. AAT8636 Series PACKAGE DIMENSION – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 11 of 16 V 1.0 Advanced Analog Technology, Inc. AAT8636 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 – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 12 of 16 V 1.0 Advanced Analog Technology, Inc. AAT8636 Series TAPE AND REEL – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 13 of 16 V 1.0 Advanced Analog Technology, Inc. AAT8636 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 – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 14 of 16 V 1.0 Advanced Analog Technology, Inc. AAT8636 Series AAT8636 Versions Description 8636A 8636 B 8636 C Over Charge Threshold Voltage ( VC1 ) 4.35V 4.28V 4.32V Over Discharge Threshold Voltage ( VD1 ) 2.50V 2.50V 2.50V Over Current Detection Voltage ( VOC ) 0.20V 0.20V 0.20V PART MARKING PREVIOUS TOP MAKING AXXX NEW TOP MARKING AXX NOTE: SOT26 HAS NO BACK MARKING. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 15 of 16 V 1.0 Advanced Analog Technology, Inc. AAT8636 Series ORDERING INFORMATION – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 16 of 16 V 1.0