View AAT8636-S3-T_1208738.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 1 of 16 v 1.0 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 a 0 . 3 ????..supply current (typical) a 1 . 0 ????..standby current ? high withstand voltage absolute maximum ratings..22v ( vn v dd ? ) ? high accuracy voltage detection over charge detector????... mv 20 over discharge detector???. % 5 . 2 ? over current and shor t circuit protection ? wide operating temperature range c 40 o ? to c 85 o ? ultra small package??..sot26 pin configuration out d vn out c gnd ext c dd v general description 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 ( dd v ) is charged to a value higher than the over charge threshold voltage ( 1 c v ), the over charge detector (com1) will switch the output pin ( out c ) to a low level within a delay time ( 1 c t ), and thus turning off the mosfet connected to the charging path. the out c pin may change to high level again when the dd v voltage falls below ? hys 1 c v v ? ?, or when dd v falls below 1 c v while the charger is disconnected from the battery pack. during the discharging process, when the dd v drops to a value lower than the over-discharge threshold voltage ( 1 d v ), the over-discharge detector (com2) will switch out d to low level within a delay time ( 1 d t ), and thus turning off the 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
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 2 of 16 v 1.0 aat8636 series standby mode right after the battery pack is connected to a charger. the conditions of over cu rrent 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 oc v , which indicates an undesirable large current is flowing through the path, out d will be switched to low and the path is cut-off right after an internally pre-set delay time ( oc t ) elapses. in the case of short circuit, i.e. vn rises above short v , the path will also be cut-off but with almost no delay time. once the over current or factors contribu ting to short circuit is removed, the built-in resistor at the vn pin, typically 100 ? block diagram gnd dd v out c out d vn ext c
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 3 of 16 v 1.0 aat8636 series pin description pin no. symbol description 1 out d output of over-discharge detection 2 vn pin for charger negative input 3 out c output of over-charge detection 4 ext c pin for external capacitor setting com1 delay time 5 dd v power supply 6 gnd ground typical application dd v gnd vn ext c out d out c 1 c 3 c 2 c f 1 . 0 f 01 . 0 ? 100 ? k 1 + ?
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 4 of 16 v 1.0 aat8636 series absolute maximum ratings symbol item rating unit dd v supply voltage 3 . 0 ? ? to dd v +0.3 v cext v input voltage ext c pin gnd 3 . 0 ? ? to dd v +0.3 v dout v output voltage out dpin gnd 3 . 0 ? ? j storage t , j t storage and junction temperature 50 ? j absolute maximum ratings stresses beyond those listed under ?a bsolute maximum ratings? may cau se permanent damage to the device. exposure to absolute maximum rating conditi ons for extended period of time may affect device reliability.
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 5 of 16 v 1.0 aat8636 series electrical characteristics ?aat8636a oper t =25 j symbol item conditions min typ max unit 1 dd v operating input voltage voltage defined as gnd v dd ? 1.5 10.0 v 1 c v over charge threshold voltage detect rising edge of supply voltage 4.33 4.35 4.37 v hys v over charge threshold hysteresis range 0.15 0.20 0.25 v 1 c t over charge delay time f 01 . 0 c 3 = , dd v =3.6v to 4.4v 60 75 90 ms 1 d v over discharge threshold voltage detect falling edge of supply voltage 2.437 2.500 2.563 v 1 d t over discharge delay time dd v =3.6v to 2.4v 7 10 13 ms oc v over current detection voltage detect rising edge of vn pin voltage 0.17 0.20 0.23 v oc t over current detection delay time dd v =3.0v 9 13 17 ms short v short circuit detection voltage dd v =3.0v 2 . 1 v dd ? 9 . 0 v dd ? 6 . 0 v dd ? v short t short circuit detection delay time dd v =3.0v 5 50 s ? ? ?
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 6 of 16 v 1.0 aat8636 series electrical characteristics ?aat8636b oper t =25 j symbol item conditions min typ max unit 1 dd v operating input voltage voltage defined as gnd v dd ? 1.5 10.0 v 1 c v over charge threshold voltage detect rising edge of supply voltage 4.26 4.28 4.30 v hys v over charge threshold hysteresis range 0.15 0.20 0.25 v 1 c t over charge delay time f 01 . 0 c 3 = , dd v =3.6v to 4.4v 60 75 90 ms 1 d v over discharge threshold voltage detect falling edge of supply voltage 2.437 2.500 2.563 v 1 d t over discharge delay time dd v =3.6v to 2.4v 7 10 13 ms oc v over current detection voltage detect rising edge of vn pin voltage 0.17 0.20 0.23 v oc t over current detection delay time dd v =3.0v 9 13 17 ms short v short circuit detection voltage dd v =3.0v 2 . 1 v dd ? 9 . 0 v dd ? 6 . 0 v dd ? v short t short circuit detection delay time dd v =3.0v 5 50 s ? ? ?
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 7 of 16 v 1.0 aat8636 series electrical characteristics ?aat8636c oper t =25 j symbol item conditions min typ max unit 1 dd v operating input voltage voltage defined as gnd v dd ? 1.5 10.0 v 1 c v over charge threshold voltage detect rising edge of supply voltage 4.30 4.32 4.34 v hys v over charge threshold hysteresis range 0.15 0.20 0.25 v 1 c t over charge delay time f 01 . 0 c 3 = , dd v =3.6v to 4.4v 60 75 90 ms 1 d v over discharge threshold voltage detect falling edge of supply voltage 2.437 2.500 2.563 v 1 d t over discharge delay time dd v =3.6v to 2.4v 7 10 13 ms oc v over current detection voltage detect rising edge of vn pin voltage 0.17 0.20 0.23 v oc t over current detection delay time dd v =3.0v 9 13 17 ms short v short circuit detection voltage dd v =3.0v 2 . 1 v dd ? 9 . 0 v dd ? 6 . 0 v dd ? v short t short circuit detection delay time dd v =3.0v 5 50 s ? ? ?
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 8 of 16 v 1.0 aat8636 series timing diagram ?aat8636 series charging discharging charging discharging char g in g over current short circuit v c1 v c1 -v hys v dd v dd v short oc v gnd vn v dd vn v dd gnd out c out d charging/ discharging current charging current discharging current t c1 t d1 t d1 t oc t short time o p en o p en v d1
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 9 of 16 v 1.0 aat8636 series operation 1. com1 (over-charge detector) com1 is the monitor of the voltage at the dd v pin. com1 senses an over charging condition and if this condition continues longer than the delay time ( c1 t ), when the voltage at dd v exceeds the over charge detector threshold c1 v . under this condition, out c 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 out c pin to drive the low level of out c to be equal to the vn pin voltage. furthermore, the high level of out c is set to be equivalent to dd v. the over charge delay time c1 t of over charging is determined by the external capacitor 3 c connected between the gnd and ext c pin. the delay time c1 t can be estimated as the following: () 6 dd 3 1 c 10 x 48 . 0 7 . 0 v x c t ? ? = however, if the duration of the over charge condition is not long enough to cover the time delay window, out c 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 out c returns to high level again and the charging path is reconnected to restart charging process, one of the conditions to reset co m1 is when dd v falls to lower than ? hys 1 c v v ? ? as a result of battery cell internal discharge. disconnecting the battery pack from the charger can also reset com1 even when dd v is still within the hysteresis window ( 1 c dd hys 1 c v v v v < ? ). after the battery pack is disconnected from the charger, connec ting 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 dd v down eventually and once dd v drops below 1 c v, out c will change to high level .
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 10 of 16 v 1.0 aat8636 series operation (cont.) 3. com2 (over discharge detector) com2 monitors the cell voltage at the dd v pin. when dd v drops below the over discharge threshold 1 d v during the discharging process, com1 detects an over charging condition and after delay time ( 1 d t ) elapses, the out d 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 cond ition 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 dd v is still lower than the over-discharge threshold. once dd v is charged up to a value higher than 1 d v, the out d pin goes to a high level. this leads to the ?on? state of both th e 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 dd v is already higher than 1 d v will make out d 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 tw o mosfets. however, when the vn pin voltage rises to a value between the short circuit detection voltage short v and over current detection voltage oc v , the aat8636 series detect an over current condition. as a result, the external discharge control n-channel mosfet goes to ?off? with out d 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 short v and oc v 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 oc v but also higher than short v , 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 v n pin will be pulled down to ground level through the internal resistor. therefore, with vn lower than the over current and short cir cuit protection threshold, out d 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.
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 11 of 16 v 1.0 aat8636 series package dimension
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 12 of 16 v 1.0 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 0.60 l1 0.60 ref l2 0.25 bsc r 0.10 ------ ------ r1 0.10 ------ 0.25 o 0 o 4 o 8 1 o 5 o 10 o 15 note: 1 jedec outline: mo-178 ab
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 13 of 16 v 1.0 aat8636 series tape and reel
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 14 of 16 v 1.0 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
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 15 of 16 v 1.0 aat8636 series aat8636 versions description 8636a 8636 b 8636 c over charge threshold voltage ( 1 c v) 4.35v 4.28v 4.32v over discharge threshold voltage ( 1 d v) 2.50v 2.50v 2.50v over current detection voltage ( oc v) 0.20v 0.20v 0.20v part marking previous top making axxx new top marking axx note: sot26 has no back marking.
advanced analog technology, inc. ? x?w?t??ta?|3--?q ? ? advanced analog technology, inc . ? page 16 of 16 v 1.0 aat8636 series ordering information

▲Up To Search▲

Price & Availability of AAT8636-S3-T

	To Download AAT8636-S3-T Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .