SC8201 one-cell li+ battery protection circuit description SC8201 is a lifepo4 battery protection circuit. it is suitable for protecting li+ battery against damage from over charge, over discharge, and over current. it contains high accurate voltage detection and delay circuits. features * low consumption current v dd =3.4v, i dd =(typ. 3 a) v dd =1.8v, i dd =(typ. 0.3 a) * wide supply voltage range: (1.8v~8v) * over-charge detection voltage 3.65v, over-charge release voltage 3.45v. * over-discharge detection voltage 2.00v, over-discharge release voltage 2.50v. * over current detect voltage 0.15v, short current detection voltage 1.00v. * overcharge/over-discharge/over-current detection delay times are generated by an internal circuit * charger detection * over current protection * small package ordering information device package seal name SC8201 sot-23-6 8201 applications * protection ic for one-cell lifepo4 battery pack block diagram hangzhou microelectronics co.,ltd rev:1.3 2008.06.25 http://www.silan.com.cn page 1 o f 10
SC8201 hangzhou microelectronics co.,ltd rev:1.3 2008.06.25 http://www.silan.com.cn page 2 o f 10 absolute maximum rating characteristics symbol value unit supply voltage v dd v ss -0.3 ~ v ss +12 v oc output pin voltage v oc v dd -15 ~ v dd +0.3 v od output pin voltage v od v ss -0.3 ~ v dd +0.3 v csi input pin voltage v csi v dd -15 ~ v dd +0.3 v operating temperature range t opr -40 ~ + 85 c storage temperature range t stg -40 ~ +125 c electrical characteristics ( t amb =25 c, unless otherwise specified ) characteristics symbol conditions min. typ. max. unit operating voltage operating voltage v dd 1.8 8.0 v current consumption supply current i dd v dd =3.4v 3.0 6.0 a power down current i pd v dd =1.8v 0.3 0.6 a detection voltage over charge detection voltage v ocu 3.620 3.650 3.680 v over charge release voltage v ocr 3.415 3.450 3.485 v over discharge detection voltage v odl 1.90 2.00 2.10 v over discharge release voltage v odr 2.40 2.50 2.60 v over current 1 detection voltage v oi1 0.13 0.15 0.17 v over current (short current)detection voltage v oi2 v dd =3.6v 0.80 1.00 1.20 v over current reset resistor rshort v dd =3.6v 400 500 600 k charger detection voltage v ch -0.8 -0.5 -0.2 v delay time over charge detection delay time t oc 150 340 500 ms over discharge detection delay time t od v dd =3.6v~2.0v 80 200 300 ms over current 1 detection delay time t oi1 v dd =3.6v 5 13 20 ms over current 2(short current)detection delay time t oi2 v dd =3.6v 5 50 s other oc pin output ?h? voltage v oh1 v dd -0.1 v dd -0.02 v oc pin output ?l? voltage v ol1 0.01 0.1 v od pin output ?h? voltage v oh2 v dd -0.1 v dd -0.02 v od pin output ?l? voltage v ol2 0.01 0.1 v
SC8201 pin configuration pin descriptions pin no. symbol i/o description 1 od o fet gate connection pin for discharge control. 2 csi i/o detecting pin for current sense, charger detect. 3 oc o fet gate connection pin for charge control. 4 td i test pin for delay time. 5 v dd i positive power input pin. 6 v ss negative power input pin. i function descriptions normal state if v odl v oi1 occurs, m2 is to be turned on and back to normal state. hangzhou microelectronics co.,ltd rev:1.3 2008.06.25 http://www.silan.com.cn page 3 o f 10
SC8201 hangzhou microelectronics co.,ltd rev:1.3 2008.06.25 http://www.silan.com.cn page 4 o f 10 overdischarge detection when enter overdischarge state fr om normal state, the battery vo ltage can be detected from v dd. when the battery voltage v dd is smaller than v odl over a delay time of t od ; m1 is to be turned off. in the meanwhile, csi is pulled to v dd by way of internal resistor r csid . if v csi >v oi2 , the protection ic enters into power-down mode. (its current consumption is lower than 0.3 a). release of power-down mode a charger is connected while the battery remains in power-down mode, if v ch v odr occurs, m1 is to be turned on and back to normal state. charge detection if a charger is connected to the battery remained in power-down mode, if v csi v odl , m1 is to be turned on and back to normal state. abnormal charging state if a charger is connected to the battery in normal state, v csi SC8201 timing diagram overcharge state self discharging normal state overcharge state load discharging normal state battery voltage oc pin od pin csi pin hangzhou microelectronics co.,ltd rev:1.3 2008.06.25 http://www.silan.com.cn page 5 o f 10
SC8201 overcharge state charging by charger normal state overcharge state abnormal state normal state hangzhou microelectronics co.,ltd rev:1.3 2008.06.25 http://www.silan.com.cn page 6 o f 10
SC8201 over current state normal state hangzhou microelectronics co.,ltd rev:1.3 2008.06.25 http://www.silan.com.cn page 7 o f 10 charger connection v ocu v ocr v odr v odl v dd csi battery voltage oc pin v dd v ss od pin v dd v ss v ch csi pin v oi2 t oi1 t oi2 load connection state diagram of operation abnormal charge current condition (oc=0) (f) over charge condition, (oc=0) (a) normal condition (od=oc=1)@ v odl t oc (100ms) (t) v csi >v ch (-0.6v) (h) v csi >v oi1 (0.15v) & v dd v ocu (4.35v) & t>t oc (100ms) (g) v dd t od (10ms) ( r ) v csi v odr (3.0v) (k) v csi >v oi2 (m) v ch v odl (b) v csi >v oi1 (0.15v) & t>t oi1 (10ms) ( c ) v csi >v oi2 & t>t oi2 (5 s) (d) load resistor >500k od=0 i dd ipd(0.3 a) v csi is shorted to v dd (pull-up to v dd ) via resistor r csid (300k) od=0 SC8201 operation status diagram release overdischarge trickle charging by automatic charging
SC8201 typical application circuits note: the circuit and parameters are reference only, pl ease set the parameters of the real application circuit based on the real test . package outline sot-23-6 unit: mm hangzhou microelectronics co.,ltd rev:1.3 2008.06.25 http://www.silan.com.cn page 8 o f 10
SC8201 handling mos devices: electrostatic charges can exist in many things. all of our mos devices are inte rnally protected against electrostatic discharge but they can be damage d if the following precautions are not taken: ? persons at a work bench should be earthed via a wrist strap. ? equipment cases should be earthed. ? ? all tools used during assembly, including sol dering tools and solder baths, must be earthed. ? mos devices should be packed for dispatch in antistatic/conductive containers. note silan reserves the right to make changes without notice in this specification for the improvement of the design and performance . silan will supply the best possible product for customers. hangzhou microelectronics co.,ltd rev:1.3 2008.06.25 http://www.silan.com.cn page 9 o f 10
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