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aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 3663.2008.01.1.2 1 www.analogictech.com general description the aat3663 batterymanager? is a member of analogictech?s total power management ic? family. this device is an integrated single/dual cell lithium-ion (li-ion) / polymer battery charger ic designed to oper- ate from usb ports or an ac adapter inputs up to an input voltage of 13.2v. aat3663 precisely regulates battery charge voltage and current for 4.2v and 8.4v li-ion battery cells. the bat- tery charging current is user programmed up to 1a by an external resistor. battery charge state is continuously monitored for fault conditions. a digital thermal loop control maintains the maximum possible battery charging current for the opti- mum set of input to output power dissipation and ambient temperature conditions. in the event of an over-current, over-voltage, short-circuit, or over-temperature fault con- dition, the device will automatically shut down, thus pro- tecting the charger and the battery under charge. two status monitor output pins are provided to indicate the battery charge status by directly driving external leds. additionally, an open-drain power-source detec- tion output (adpp#) is provided to report presence of an input power supply the aat3663 is available in a thermally enhanced, space-saving, 14-pin 3x3 mm tdfn package and is specified for operation over the -40c to +85c tem- perature range. features ? 4.0v ~ 13.2v input voltage range ? compatible with usb or ac adapter sources ? programmable fast charge current from 100ma to 1a ? programmable charge termination current ? digital thermal loop charge reduction ? less than 0.4 a battery leakage current ? programming charge timer ? battery temperature sensing ? battery temp sense open circuit detection ? automatic recharge sequencing ? automatic trickle charge for battery pre-conditioning ? automatic charge termination shutdown/sleep mode ? less than 1 a shutdown current ? over-voltage and over-current protection ? power on reset and soft start ? 3x3mm 14-pin tdfn package applications ? digital still cameras ? global positioning systems (gps) ? point of service (pos) terminals ? portable dvd players ? portable media players (pmp) ? two way radios typical application v in r term adpp# on/off en term gnd bat stat2 r set iset in stat1 ct 10f batt- battery pack batt+ - temp c t ts bats aat3663
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 2 3663.2008.01.1.2 www.analogictech.com aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 2 3663.2008.01.1.2 www.analogictech.com pin description pin # symbol type function 1eni enable pin, active high with internal pull-down. if not used, pull high to the in pin to continuously enable the charger ic when input power is applied. 2cti charge timer programming pin. a 0.1 f ceramic capacitor should be connected between this pin and gnd. connect directly to gnd to disable the timer function. 3 iset i charge current programming pin. connect a resistor between this pin and gnd to program the con- stant fast charge current. 4 gnd i/o ic ground connection. connect this pin to power ground. 5 ts i/o battery temperature sense input. connect the li-ion battery pack ntc resistor terminal to this pin. 6batsi battery voltage sense pin. connect this pin directly to the positive battery terminal. if this function is not used, connect to the bat pin directly. 7 bat o battery charge output pin. connect to the positive battery terminal. 8, 9 in i power supply input pin. connect the input usb port or adapter power source to this pin 10 stat1 o charge status pin, open-drain output. connect the stat1 led with a series ballast resistor between in and this pin. 11 stat2 o charge status pin, open-drain output. connect the stat2 led with a series ballast resistor between in and this pin. 12 adpp# o input supply power-good status pin, open-drain output. connect the adpp# status led with a series ballast resistor between in and this pin. 13 term i charge termination current programming input pin. connect a resistor between this pin and gnd to program the charge termination current. when term is open, the termination current is 10% (default sertting) of the set maximum charge current. 14 n/c no connection. pin configuration tdfn33-14 (top view) en iset gnd 1 ts bats bat n/c adpp# stat2 stat1 in in ct 2 3 4 5 6 7 14 term 13 12 11 10 9 8
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 3663.2008.01.1.2 3 www.analogictech.com aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 3663.2008.01.1.2 3 www.analogictech.com absolute maximum ratings 1 symbol description value units v in in continuous voltage -0.3 to 14 v v n stat1, stat2, adpp#, en, bat, bats -0.3 to v in + 0.3 v v n ts, ct, term, iset -0.3 to 5.5 v t j operating junction temperature range -40 to 150 c t lead maximum soldering temperature (at leads) 300 c thermal information 2 symbol description value units ja maximum thermal resistance (tdfn3x3) 50 c/w p d maximum power dissipation 2 w aat3663 feature options product number of battery cells battery temperature sense aat3663-4.2-1 single for use with any ntc thermistor aat3663-4.2-2 single for use with 10k ntc thermistor aat3663-8.4-1 dual for use with any ntc thermistor aat3663-8.4-2 dual for use with 10k ntc thermistor 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at c onditions other than the operating conditions specified is not implied. only one absolute maximum rating should be applied at any one time. 2. mounted on a fr4 board.
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 4 3663.2008.01.1.2 www.analogictech.com aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 4 3663.2008.01.1.2 www.analogictech.com electrical characteristics v in = 5v, t a = -40 to +85c; unless otherwise noted, typical values are at t a = 25c. symbol description conditions min typ max units operation v in input voltage range 4.0 13.2 v v uvlo under voltage lockout threshold rising edge 3 4 v uvlo hysteresis 150 mv v adpp_th adapter present indicator threshold voltage, v in ? v bat v in > v uvlo 50 100 mv i op operating current charge current = 100ma 0.35 1 ma i shutdown shutdown current v bat = 4.25v, en = gnd 0.4 1 a i leakage leakage current from bat pin v bat = 4v, in = open 0.4 2 a en leakage en pin leakage v en = 5v 0.6 a voltage regulation v bat_eoc end of charge voltage regulation aat3663-4.2 4.158 4.2 4.242 v aat3663-8.4 8.316 8.4 8.484 v bat_eoc / v bat_eoc end of charge voltage accuracy 0.5 % v min preconditioning voltage threshold aat3663-4.2 2.5 2.6 2.7 v aat3663-8.4 5.0 5.2 5.4 v rch battery recharge voltage threshold aat3663-4.2 v bat_eoc - 0.1 v aat3663-8.4 v bat_eoc - 0.2 current regulation i cc_range charge current programmable range 100 1000 ma i ch_cc constant-current mode charge current r iset = 1.74k (for 1a), v bat = 3.6v 900 1000 1100 ma r iset = 17.8k (for 0.1a), v bat = 3.6v 80 100 120 v iset iset pin voltage 2v k iset charge current set factor: i ch_cc /i set constant current mode, v bat = 3.6v 900 v term term pin voltage r term = 40k 0.6 v i ch_trk trickle-charge current 51015% i ch_cc term pin open 5 10 15 % i ch_cc i ch_term charge termination current threshold r term = 13.3 k , i ch_cc 800ma 8 10 12 % i ch_cc charging devices r ds(on) charging transistor on resistance v in = 5v 330 500 m logic control / protection v en input high threshold 1.6 v input low threshold 0.4 v stat output low voltage stat pin sinks 4ma 0.4 v i stat stat pin current sink capability 8ma
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 3663.2008.01.1.2 5 www.analogictech.com aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 3663.2008.01.1.2 5 www.analogictech.com electrical characteristics v in = 5v, t a = -40 to +85c; unless otherwise noted, typical values are at t a = 25c. symbol description conditions min typ max units logic control / protection v addp# output low voltage adpp# pin sinks 4ma 0.4 v i adpp# addp# current sink capability 8ma v ovp over-voltage protection threshold aat3663-4.2 4.4 v aat3663-8.4 8.8 v ocp over-current protection threshold 105 %v cs tk trickle charging time-out c t = 100nf, v in = 5v t c /8 hour tc trickle and constant current mode time-out c t = 100nf, v in = 5v 3 hour tv constant voltage mode time-out c t = 100nf, v in = 5v 3 hour i ts current source from ts pin aat3663-2 only 71 75 79 a t s1 ts hot temperature fault threshold, aat3663-2 only 316 331 346 mv hysteresis, aat3663-2 only 25 t s2 ts cold temperature fault threshold, aat3663-2 only 2.30 2.39 2.48 v hysteresis, aat3663-2 only 25 mv v ts1 high temperature threshold threshold, aat3663-1 only 29.1 30 30.9 %v in hysteresis, aat3663-1 only 2 v ts2 low temperature threshold threshold, aat3663-1 only 58.2 60 61.8 %v in hysteresis, aat3663-1 only 2 t loop_in digital thermal loop entering threshold 115 c t loop_out digital thermal loop exiting threshold 85 c t reg digital thermal loop regulation 100 c t shdn over-temperature shutdown threshold 140 c hysteresis 15
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 6 3663.2008.01.1.2 www.analogictech.com aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 6 3663.2008.01.1.2 www.analogictech.com typical characteristics?general operating current vs i set resistor r set (k ) operating current (a) 0 200 400 600 800 1000 1200 1400 1600 1800 2000 1 10 100 constant current mode preconditioning mode constant charging current vs. set resistor values r set (k ) constant charge current (ma) 1 10 100 1000 10000 1 10 100 temperature sense output current vs. temperature temperature (c) i ts (a) 70 71 72 73 74 75 76 77 78 79 80 -40 -15 10 35 60 85 shutdown current vs. input voltage input voltage (v) shutdown current (a) 0.00 0.30 0.60 0.90 1.20 1.50 1.80 2.10 2.40 4 5 6 7 8 9 10 11 12 13 1 4 85c 25c -40c charging transistor on resistance vs. input voltage input voltage (v) r ds(on) (m ) 0 100 200 300 400 500 600 4.0 4.4 4.8 5.2 5.6 6.0 6.4 6.8 7.2 7.6 8.0 8. 4 85c 25c -40c ct pin capacitance vs. counter timeout timeout (h) capacitance (f) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0 0.5 1 1.5 2 2.5 3 4 4.5 5 3.5 preconditioning timeout preconditioning + constant current timeout or constant voltage timeout
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 3663.2008.01.1.2 7 www.analogictech.com aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 3663.2008.01.1.2 7 www.analogictech.com temperature sense too hot threshold voltage vs. temperature temperature (c) temperature sense too hot threshold (%) 29.0 29.2 29.4 29.6 29.8 30.0 30.2 30.4 30.6 30.8 31.0 -40 -15 10 35 60 85 temperature sense too cold threshold voltage vs. temperature temperature (c) temperature sense too cold threshold (%) 59.0 59.2 59.4 59.6 59.8 60.0 60.2 60.4 60.6 60.8 61.0 -40 -15 10 35 60 85 input high threshold vs. input voltage input voltage (v) v en(h) (v) 0.60 0.70 0.80 0.90 1.00 1.10 1.20 1.30 4 5 6 7 8 9 10 11 12 13 14 -40c 25c 85c input low threshold vs. input voltage input voltage (v) v en(l) (v) 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 4 5 6 7 8 9 10 11 12 13 14 -40c 25c 85c termination current to constant current ratio (%) vs. termination resistance r term (k ) i ch_term /i ch_cc (%) 0 5 10 15 20 25 30 35 40 45 50 0 102030405060
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 8 3663.2008.01.1.2 www.analogictech.com aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 8 3663.2008.01.1.2 www.analogictech.com typical characteristics?single cell 4.2v end of charge voltage accuracy vs. input voltage (v bat_eoc = 4.2v) input voltage (v) end of charge voltage accuracy (%) -0.100 -0.075 -0.050 -0.025 0.000 0.025 0.050 0.075 0.100 4 5 6 7 8 9 10 11 12 13 14 end of charge voltage vs. temperature temperature (c) battery voltage (v) 4.180 4.185 4.190 4.195 4.200 4.205 4.210 4.215 4.220 -40 -15 10 35 60 85 recharge threshold voltage vs. input voltage input voltage (v) battery voltage (v) 4.080 4.085 4.090 4.095 4.100 4.105 4.110 4.115 4.120 4 5 6 7 8 9 10 11 12 13 14 recharge voltage vs. temperature (v in = 5v; r set = 8.87k ) temperature (oc) battery voltage (v) 4.06 4.07 4.08 4.09 4.10 4.11 4.12 4.13 4.14 -40 -15 10 35 60 8 5 charging current vs. battery voltage (r set = 8.87k ) battery voltage (v) charging current (ma) 0 30 60 90 120 150 180 210 240 2.3 2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4. 3 v in = 13.2v v in = 12v v in = 5v v in = 9.5v v in = 7.5v charging current vs. battery voltage battery voltage (v) i ch (ma) 0 200 400 600 800 1000 1200 2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4. 3 r set = 8.87k r set = 2.21k r set = 3.57k r set = 1.78k
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 3663.2008.01.1.2 9 www.analogictech.com aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 3663.2008.01.1.2 9 www.analogictech.com typical characteristics?single cell 4.2v preconditioning threshold voltage vs. input voltag e input voltage (v) battery voltage (v) 2.50 2.52 2.54 2.56 2.58 2.60 2.62 2.64 2.66 2.68 2.70 4 5 6 7 8 9 10 1112 1314 preconditioning threshold voltage vs. temperature temperature (c) battery voltage (v) 2.50 2.52 2.54 2.56 2.58 2.60 2.62 2.64 2.66 2.68 2.70 -40 -15 10 35 60 85 preconditioning charge current vs. input voltage input voltage (v) i ch_trk (ma) 0 20 40 60 80 100 120 4 5 6 7 8 9 10 11 12 13 14 r set = 1.78k r set = 2.21k r set = 3.57k r set = 8.87k constant charge current vs. input voltage (r set = 8.87k ) input voltage (v) charge current (ma) 160 170 180 190 200 210 220 230 240 4 5 6 7 8 9 10 11 12 13 14 v bat = 4.1v v bat = 3.9v v bat = 3.5v v bat = 3.3v
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 10 3663.2008.01.1.2 www.analogictech.com aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 10 3663.2008.01.1.2 www.analogictech.com typical characteristics?dual cell 8.4v end of charge voltage accuracy vs. input voltage (v bat_eoc = 8.4v) input voltage (v) end of charge voltage accuracy (%) -0.12 -0.09 -0.06 -0.03 0.00 0.03 0.06 0.09 0.12 9.0 9.6 10.2 10.8 11.4 12.0 12.6 13.2 end of charge voltage vs. temperature (v in = 10v; r set = 8.87k ) temperature (c) battery voltage (v) 8.36 8.37 8.38 8.39 8.40 8.41 8.42 8.43 8.44 -40 -15 10 35 60 85 end of charge voltage vs. input voltage (r set = 8.87k ) input voltage (v) battery voltage (v) 8.380 8.385 8.390 8.395 8.400 8.405 8.410 8.415 8.420 9.0 9.6 10.2 10.8 11.4 12.0 12.6 13.2 recharge threshold voltage vs. input voltage input voltage (v) battery voltage (v) 8.180 8.185 8.190 8.195 8.200 8.205 8.210 8.215 8.220 8 9 10 11 12 13 14 recharge threshold voltage vs. temperature (v in = 10v; r set = 8.87k ) temperature (c) battery voltage (v) 8.12 8.14 8.16 8.18 8.20 8.22 8.24 8.26 8.28 -40 -15 10 35 60 85 constant charging current vs. battery voltage (r set = 8.87k ) battery voltage (v) charging current (ma) 0 30 60 90 120 150 180 210 240 4.9 5.3 5.7 6.1 6.5 6.9 7.3 7.7 8.1 8.5 v in = 10v v in = 11v v in = 12v v in = 13.2v
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 3663.2008.01.1.2 11 www.analogictech.com aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 3663.2008.01.1.2 11 www.analogictech.com typical characteristics?dual cell 8.4v constant charging current vs. battery voltage battery voltage (v) i ch (ma) 0 200 400 600 800 1000 1200 4.9 5.3 5.7 6.1 6.5 6.9 7.3 7.7 8.1 8. 5 r set = 1.78k r set = 2.21k r set = 3.57k r set = 8.87k preconditioning threshold voltage vs. input voltag e input voltage (v) battery voltage (v) 5.180 5.185 5.190 5.195 5.200 5.205 5.210 5.215 5.220 8 9 10 11 12 13 14 preconditioning threshold voltage vs. temperature temperature (c) battery voltage (v) 5.16 5.17 5.18 5.19 5.20 5.21 5.22 5.23 5.24 -40 -15 10 35 60 85 constant charge current vs. input voltage (r set = 8.87k ) input voltage (v) charge current (ma) 160 170 180 190 200 210 220 230 240 8 9 10 11 12 13 14 v bat = 8.2v v bat = 6.6v v bat = 7v
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 12 3663.2008.01.1.2 www.analogictech.com functional description the aat3663 is a high performance battery charger designed to charge single/dual cell lithium-ion or lithium-polymer batteries with up to 1000ma of current from an external power source. it is a highly integrated stand-alone charging solution, with the least external components required for complete functionality. the aat3663 precisely regulates end of charge battery voltage and current for single cell 4.2v and dual cell 8.4v lithium-ion/polymer battery with a programmable con- stant current range from 100ma to 1a for fast charging applications. the system has a default charge termina- tion current set to 10 percent of the programmed fast charge constant. the charge termination current may also be user programmed by an external resistor. during battery charging, the device temperature will rise. in some cases with adapter (adp) charging, the power dissipation in the charge regulation pass device may cause the junction temperature to rise and approach the internal thermal shutdown threshold. excessive power dissipation is caused by the high input adapter voltage versus the low output battery cell voltage difference at a given constant charge current. in the event of an internal over-temperature condition caused by excessive ambient operating temperature or excessive power dissipation conditions, the aat3663 enables a digitally controlled thermal loop system that will reduce the charging current to prevent thermal shutdown. the digital thermal loop will maintain the maximum possible battery charging current for a given set of input to output power dissipa- tion and ambient temperature conditions. the digital thermal loop control is dynamic in the sense that it will continue to adjust the battery charging current as operating conditions change. the digital thermal loop will reset and resume normal operation when the power dissipation or over-temperature conditions are removed. in the event of an over-voltage, over-current or over- temperature false condition beyond the limits of the digital thermal loop system, the device will automati- cally shut down, thus protecting the charging device, control system, and the battery under charge. aat3663 provides two status monitor pins, stat1 and stat2. these pins are open drain mosfet switches intended to directly drive external leds to indicate the battery charging state. a third status pin is prided to indicate the presence of power on the input supply pin. functional block diagram charge control current compare reverse blocking cv/ precharge constant current in bat iset uvlo over-temp protect power detection stat 1 gnd en thermal loop a dpp# charge status bats ct ts stat 2 watchdog timer term 75a aat3663-2 only window comparator
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 3663.2008.01.1.2 13 www.analogictech.com this open drain mosfet switch may be used to either power a display led or to alert a system microcontroller for the presence on input power. battery charging operation figure 1 illustrates the entire battery charging profile and operation, which consists of three phases: 1. preconditioning (trickle) charge 2. constant current charge 3. constant voltage charge when power is initially applied or when a battery pack is connected to the bat pin, battery charging commences after the aat3663 checks several conditions in order to maintain a safe charging environment. the input supply must be above the minimum operating voltage (uvlo) and the enable pin must be high (internally pulled down). when the battery is connected to the bat pin the aat3663 checks the condition of the battery and deter- mines which charging mode to apply. battery preconditioning if the battery voltage is below v min , the aat3663 begins battery trickle charging by charging at 10% of the pro- grammed constant-current. for example, if the pro- grammed current is 500ma, then the trickle charge current is 50ma. trickle charging is a recommended safety precaution for a deeply discharged cell and maxi- mizes the charge cycle life of the battery. in addition, charger ic power dissipation for the internal series pass mosfet is minimized when the input-output voltage dif- ferential is at its highest. this in turn allows the charg- ing operation to commence over wider thermal and input to output voltage differential conditions. constant current charging trickle charging continues until the battery voltage reaches the v min threshold. at this point, the aat3663 begins constant-current fast charging. the current level for this mode is programmed using a single resistor from the iset pin to ground. programmed current can be set at a minimum 100ma up to a maximum 1a. constant voltage charging constant current charging continues until such time that the battery voltage reaches the voltage regulation point v bat_reg . when the battery voltage reaches v bat_reg , the aat3663 will transition to the constant-voltage mode. the regulation voltage is factory programmed to a nom- inal 4.2v for the aat3663-4.2 option and to 8.4v for the aat3663-8.4 option. under default conditions with the term pin not connected (open circuit), constant voltage charging will continue until the charge current has reduced to 10% of the programmed current. placing a resistor between the term pin and ground allows the user to program a desired termination current. after the charge cycle is complete, the aat3663 turns off the series pass device and automatically goes into a power saving sleep mode. during this time the series pass device will block current in both directions there- fore preventing the battery discharging through the ic. the aat3663 will remain in sleep mode, until either the battery terminal voltage drops below the v rch threshold, the charger en pin is recycled or the charging power source is reconnected. in all cases the aat3663 will monitor all battery parameters and resume charging in the appropriate mode. constant current charge phase constant voltage charge phase preconditioning trickle charge phase charge complete voltage constant current mode voltage threshold regulated current trickle charge and termination threshold i = cc / 10 i = max cc figure 1: current and voltage profile during charging phases.
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 14 3663.2008.01.1.2 www.analogictech.com system operation flow chart v ch >v bat v min >v bat shut down mode shut down mode i bat > i min no no charge completed charge completed recharge rch v yes set expire yes no device temp. monitor t j >110 c yes adp voltage s adp > v adpp no preconditioning test v min >v bat current phase test v in >v bat_eoc voltage phase test i bat >i term shut down mode shut down mode no no charge completed charge completed test v rch > bat yes set expire yes no device temp . monitor t j >115 c yes fault no yes no power select power input voltage v in >v uvlo power select fault condition monitoring ov, ot, v ts1 i term shut down mode shut down mode shut down mode fault stat1=off stat2=off yes
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 3663.2008.01.1.2 15 www.analogictech.com application information adapter or usb power input constant current charge levels up to 1a may be pro- grammed by the user when powered from a sufficient input power source. the aat3663 will operate over an input voltage range from 4.0v to 13.2v. the low input voltage capability of the aat3663 permits charging sin- gle cell li-ion/poly batteries from usb ports and lower voltage input power sources. the high 13.2v input rating of this device allows for the use of a wide range of input power sources for both single and dual cell li-ion/poly applications. adapter input charge inhibit and resume the aat3663 has an under-voltage lockout (uvlo) and power on reset feature so that if the input supply to the in pin drops below the uvlo threshold, the charger will suspend charging and shut down. when power is reap- plied to the in pin or the uvlo condition recovers, the system charge control will assess the state of charge on the battery cell and will automatically resume charging in the appropriate mode for the condition of the battery. battery connection and battery voltage sensing battery connection a single or dual cell li-ion/polymer battery should be connected between the bat pin and ground. battery voltage sensing the bats pin is provided to employ an accurate voltage sensing capability to measure the positive terminal volt- age at the battery cell being charged. this function reduces measured battery cell voltage error between the battery terminal and the charge control ic. the aat3663 charge control circuit will base charging mode states upon the voltage sensed at the bats pin. the bats pin must be connected to the battery terminal for correct operation. if the battery voltage sense function is not needed, the bats pin should be terminated directly to the bat pin. if there is concern of the battery sense function inadvertently becoming an open circuit, the bats pin may be terminated to the bat pin using a 10k resistor. under normal operation, the connection to the battery terminal will be close to 0 ; if the bats connec- tion becomes an open circuit, the 10k resistor will pro- vide feedback to the bats pin from the bat connection with a voltage sensing accuracy loss of 1mv or less. enable (en) en is a logic input (active high) to enable the charger, this function is internally pulled down to ground. when the device is initially enabled or if the en pin is cycled low and then re-enabled, the charge control circuit will auto- matically reset and resume charging functions with the appropriate charging mode based on the battery charge state and measured battery voltage on the bats pin. programming charge current the constant current mode charge level is user pro- grammed with a set resistor (r set ) connected between the iset pin and ground. the accuracy of the constant charge current, as well as the preconditioning trickle charge cur- rent, is dominated by the tolerance of the set resistor used. for this reason, a 1% tolerance metal film resistor is recommended for the set resistor function. the con- stant charge current levels from 100ma to 1a may be set by selecting the appropriate resistor value from table 1. constant charging current (ma) set resistor value (k ) 100 17.8 200 8.87 300 5.9 400 4.42 500 3.57 600 2.94 700 2.55 800 2.21 900 1.96 1000 1.78 table 1: r set values. if the desired charge current level is not listed in table 1, the r set resistor value can be found in figure 2 and calculated by the following equation: r set = k ?? ?? v iset i cc where: k = k i_set = 900 v iset = 2v i cc = fast charge constant current
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 16 3663.2008.01.1.2 www.analogictech.com r set (k ) cc mode charge current (ma) 1 10 100 1000 10000 1 10 100 figure 2: constant charging current vs. r set resistor values. programmable charge termination current the aat3663 is designed with a default charge termina- tion current set to 10 percent of the programmed fast charge constant current level. the charge termination current (i ch_term ) may also be user programmed to a level other than 10% of the set fast charge current by connecting a set resistor (r term ) between the term pin and ground. when the charge current under the constant voltage charging mode drops to the charge termination thresh- old the device halts charging and goes into a sleep mode. the charger will remain in the sleep mode until the battery voltage as sensed by the bats pin decreases to a level below the battery recharge voltage threshold (v rch ). charge termination current levels based on a percentage of the programmed fast charge current are shown in figure 3. if the desired charge termination current set resistor (r term ) value is not shown in figure 3, the value may be determined by the following equation: i ch_term = i ch_cc 15a r term 2v where: i ch_term = charge termination current level i ch_cc = programmed fast charge constant current level r term = term resistor value r term (k ) i ch_term /i ch_cc (%) 0 5 10 15 20 25 30 35 40 45 50 0 102030405060 figure 3: charge termination current (% value of the programmed fast charge current) vs. r term resistance. battery charge status indication the aat3663 indicates the status of the battery under charge using three status led driver outputs. these three leds can indicate simple functions such as input power present, no battery charge activity, battery charg- ing, charge complete and charge fault. status indicator display system charging status may be displayed using one or two leds in conjunction with the stat1 and stat2 pins on the aat3663. these two pins are simple open drain n-channel mosfet switches to connect the status led cathodes to ground. it is not necessary to use both dis- play leds if a user simply wants to have a single led to show ?charging? or ?not charging?. this can be accom- plished by just using the stat1 pin and a single led. using two leds and both stat pins simply gives the user more information for the various charging states. refer to table 2 for led display definitions. event description stat1 stat2 charge enabled without battery flash 1 flash 1 battery charging on off charging completed off on fault off off table 2: led status indicator truth table. 1. flashing rate depends on output capacitance.
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 3663.2008.01.1.2 17 www.analogictech.com the led anodes should be connected to the charger power source input (in pin). input power present indicator the addp# pin provides an additional open drain n-channel mosfet switch to indicate the presence of power applied to the charger input (in pin). this func- tion may either be used to control an addition status led to give a visual indication when input power is applied. this open drain output may also be pulled high via a pull up resistor to provide an active low signal to a system microcontroller to indicate the presence of applied input power. status display led biasing the led should be biased with as little current as neces- sary to create reasonable illumination; therefore, a bal- last resistor should be placed between the led cathode and the stat pin. led current consumption will add to the overall thermal power budget for the device pack- age, hence it is good to keep the led drive current to a minimum. 2ma should be sufficient to drive most low- cost green or red leds. it is not recommended to exceed 8ma for driving an individual status led. the required ballast resistor values can be estimated using the following formula: (v in - v f(led) ) r ballast = i led example: (5.0v - 2.0 v) r ballast = = 1.5k 2ma note: red led forward voltage (v f ) is typically 2.0v @ 2ma. digital thermal loop control due to the integrated nature of the linear charging con- trol pass device for the adapter mode, a special thermal loop control system has been employed to maximize charging current under all operation conditions. the thermal management system measures the internal cir- cuit die temperature and reduces the fast charge current when the device exceeds a preset internal temperature control threshold. once the thermal loop control becomes active, the fast charge current is initially reduced by a factor of 0.28. the initial thermal loop current can be estimated by the following equation: i tloop = i ch_cc 0.28 the thermal loop control re-evaluates the circuit die tem- perature every 1.5 seconds and adjusts the fast charge current back up in small steps to the full fast charge cur- rent level or until an equilibrium current is discovered and maximized for the given ambient temperature condi- tion. the thermal loop controls the system charge level; therefore, the aat3663 will always provide the highest level of constant current in the fast charge mode possible for any given ambient temperature condition. protection circuitry programmable timer function the aat3663 contains a watchdog timing circuit to shut down charging functions in the event of a defective bat- tery cell not accepting a charge over a preset period of time. typically, a 0.1 f ceramic capacitor is connected between the ct pin and ground. when a 0.1 f ceramic capacitor is used, the device will time out a shutdown condition if the trickle charge mode exceeds 25 minutes and a combined trickle charge plus constant current mode of 3 hours. when the device transitions to the constant voltage mode, the timing counter is reset and will time out after an additional 3 hours if the charge current does not drop to the charge termination level. the aat3663 has a battery fault detector, which, when used in conjunction with a 0.1 f capacitor on the ct pin, outputs a 1hz signal with 50% duty cycle at the stat1 pin in the event of a timeout while in the trickle charge mode. mode time trickle charge (tc) time out 25 minutes trickle charge (tc) + constant current (cc) mode time out 3 hours constant voltage (cv) mode time out 3 hours table 3: summary for a 0.1 f ceramic capacitor used for the timing capacitor. the ct pin is driven by a constant current source and will provide a linear response to increases in the timing capacitor value. thus, if the timing capacitor were to be doubled from the nominal 0.1 f value, the timeout peri- ods would be doubled. if the programmable watchdog
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 18 3663.2008.01.1.2 www.analogictech.com timer function is not needed, it can be disabled by ter- minating the ct pin to ground. the ct pin should not be left floating or unterminated, as this will cause errors in the internal timing control circuit. the constant current provided to charge the timing capacitor is very small, and this pin is susceptible to noise and changes in capac- itance value. therefore, the timing capacitor should be physically located on the printed circuit board layout as close as possible to the ct pin. since the accuracy of the internal timer is dominated by the capacitance value, a 10% tolerance or better ceramic capacitor is recom- mended. ceramic capacitor materials, such as x7r and x5r types, are a good choice for this application. over-voltage protection an over-voltage event is defined as a condition where the voltage on the bat pin exceeds the maximum bat- tery charge voltage and is set by the overvoltage protec- tion threshold (v ovp ). if an over-voltage condition occurs, the aat3663 charge control will shut down the device until the voltage on the bat pin drops below v ovp . the aat3663 will resume normal charging operation after the overvoltage condition is removed. during an over- voltage event, the stat leds will report a system fault. over-temperature shutdown the aat3663 has a thermal protection control circuit which will shut down charging functions once the internal die temperature exceeds the over-temperature shut- down threshold. once the internal die temperature falls below the hysteresis, normal operation will resume the previous charging state. battery temperature fault monitoring there are two aat3663 temperature sense options, the aat3663-1 and aat3663-2. the aat3663-1 option allows of the use of any ntc resistor. for ease of use, the aat3663-2 option is factory set to function with typical 10k ntc resistors and eliminates the need for a resistor divider pull up to the input power source. regardless of the aat3663 option selected, the internal system control checks battery temperature before start- ing the charge cycle and continues to monitor the bat- tery temperature during all stages of the charging cycle. this is accomplished by monitoring the voltage at the ts pin. in general, the system is intended for use with negative temperature coefficient thermistors (ntc) which are typically integrated into the battery package. the voltage on the ts pin resulting from the resistive load and applied current, should stay within a window bounded by the ts1 and ts2 specification thresholds. refer to the electrical characteristics table for the ts1 and ts2 limits for a selected aat3663 option. if the bat- tery becomes too hot during charge cycle due to an internal fault or excessive charge current, the ntc thermistor will heat up and reduce in value. this in turn will pull the ts pin voltage below than the ts1 threshold, and indicate a battery cell temperature fault. the charg- ing process will then be suspended until the over-tem- perature condition is removed, at which time charging will resume. conversely, if the battery under charge is exposed to extreme cold ambient temperature condition, the ntc thermistor may increase in value and push the voltage on the ts pin above the ts2 threshold. in such a case, the charge cycle will be suspended and will not resume until the cold fault condition is removed. both ts1 and ts2 temperature fault conditions will be report by the stat1 and stat2 leds. aat3663-1 option the aat3663-1 option utilizes an internal battery tem- perature sensing system comprised of two comparators which establish a voltage window for safe operation. the thresholds for the ts operating window are bounded by the ts1 and ts2 specifications. referring to the electri- cal characteristics table in this datasheet, the ts1 threshold = 0.30 v in and the ts2 threshold = 0.6 v in . refer to figure 4 for external resistor and ntc thermis- tor connections. if the use of the battery temperature sense function is not required, it may be disabled by terminating the ts pin to in and ground using a 10k resistor divider net- work. if circuit power dissipation is a concern, the two terminating resistor values may be increased to 100k . aat3663-2 option most of the commonly used ntc thermistors in li-ion/ polymer battery packs are approximately 10k at room temperature (25c). the aat3663-2 ts pin has been specifically designed to source 75 a of current to the 10k ntc thermistor. the applied constant current source and fixed internal ts1 and ts2 voltage thresholds eliminate the need for a resistor divider on the ts pin. simply connect the 10k ntc resistor between the ts pin and ground. if the ts function is not needed for the aat3663-2, it may be left open (not connected).
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 3663.2008.01.1.2 19 www.analogictech.com t in ts battery pack aat3663-4.2-1 or aat3663-8.4-1 battery cold fault battery hot fault 0.6xv in 0. 30 xv in r t r ntc v in figure 4: external resistor and ntc thermistor application circuit. thermal considerations the aat3663 is offered in a 3x3mm tdfn package which can provide up to 2.0w of power dissipation when it is properly bonded to a printed circuit board and has a maximum thermal resistance of 50c/w. many consider- ations should be taken into account when designing the printed circuit board layout, as well as the placement of the charger ic package in proximity to other heat gener- ating devices in a given application. the ambient tem- perature around the charger ic will also have an effect on the thermal limits of the battery charging operation. the maximum limits that can be expected for a given ambient condition can be estimated by the following discussion. first, the maximum power dissipation for a given situa- tion should be calculated: (t j - t a ) p d(max) = ja where: p d(max) = maximum power dissipation (w) ja = package thermal resistance (c/w) t j = thermal loop entering threshold (oc) [115oc] t a = ambient temperature (c) figure 5 shows the relationship between maximum power dissipation and ambient temperature of aat3663 t a (c) p d(max) (w) 0.00 0.50 1.00 1.50 2.00 2.50 0 25 50 75 100 figure 5: maximum power dissipation before entering thermal loop. next, the power dissipation can be calculated by the fol- lowing equation: (p d(max) - v in i op ) v in - v bat i ch(max) = (t j - t a ) ja v in - v bat i ch(max) = - v in i op where: p d = total power dissipation by the device v in = input voltage v bat = battery voltage as seen at the bat pin i ch = constant charge current programmed for the application i op = quiescent current consumed by the charger ic for normal operation [0.5ma]
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 20 3663.2008.01.1.2 www.analogictech.com by substitution, we can derive the maximum charge cur- rent before reaching the thermal limit condition which will activate digital thermal loop operation. the maxi- mum charge current is the key factor when designing battery charger applications. in general, the worst case condition is when the greatest input to output voltage drop occurs across the charger ic. specifically when battery voltage is charged up just above the preconditioning voltage threshold and the charger enters into the constant current fast charging mode. under this condition, the device will suffer the maximum possible power dissipation since both the volt- age difference across the device and the charge current will be at their respective maximums. figure 6 shows the safe fast charge current operating region for differ- ent ambient temperatures. exceeding these limits will drive the charge control into digital thermal loop opera- tion. when under digital thermal loop operation, the device will remain active and continue to charge the bat- tery at a reduced current level for the given ambient condition. v in (v) i cc(max) (ma) 0 200 400 600 800 1000 4 5 6 7 8 9 10 11 12 13 t a = 85c t a = 60c t a = 25c t a = 45c figure 6: maximum charging current before the digital thermal loop becomes active. capacitor selection input capacitor in general, it is a good design practice to place a decou- pling capacitor between the in pin and ground. an input capacitor in the range of 1 f to 22 f is recommended. if the source supply is unregulated, it may be necessary to increase the capacitance to keep the input voltage above the under-voltage lockout threshold during device enable and when battery charging is initiated. if the aat3663?s input is to be used in a system with an exter- nal power supply source, such as a typical ac-to-dc wall adapter, then a c in capacitor in the range of 10 f should be used. a larger input capacitor in this application will minimize switching or power transient effects when the power supply is ?hot plugged? in. output capacitor the aat3663 only requires a 1 f ceramic capacitor on the bat pin to maintain circuit stability. this value should be increased to 10 f or more if the battery connection is made any distance from the charger output. if the aat3663 is to be used in applications where the battery can be removed from the charger, such as desktop charging cradles, an output capacitor 10 f or greater is recommended to reduce the effect of the charger cycling on and off when no battery is present. printed circuit board layout considerations for the best results, it is recommended to physically place the battery pack as close as possible to the aat3663 bat pin. to minimize voltage drops on the pcb, keep the high current carrying traces adequately wide. for maximum power dissipation of the aat3663 3x3mm 14-pin tdfn package, the metal substrate should be solder bonded to the board. it is also recommended to maximize the sub- strate contact to the pcb ground plane layer to further increase local heat dissipation. refer to the aat3663 evaluation board for a good layout example.
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 3663.2008.01.1.2 21 www.analogictech.com figure 7: aat3663 evaluation board figure 8: aat3663 evaluation board top (component) side layout. bottom side layout. c2 0805 x7r 10f 10v grm21br71a106ke51l c1 1206 x7r 10f 16v grm31cr71c106kac7l 2k r4 d1 c1 10f c2 10f c3 0.1f enable jp1 r2 10k r1 1.74k 2k r5 d2 2k r6 d3 r3 10k 4v - 13.2v r7 (see note) jp3 jp2 jp4 vin gnd gnd bat ts vin en 1 in 9 gnd 4 ts 5 stat2 10 in 8 stat1 11 bats 6 bat 7 iset 3 term 13 adpp# 12 ct 2 ep u1 tdfn33-14 aat3663 note: r2 = 10k is set the termination current, 7.5% from the constant charging current r7 = 10k (for -1 option) r7 = open (for -2 option) green led red led red led figure 9: aat3663 evaluation board schematic diagram.
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 22 3663.2008.01.1.2 www.analogictech.com aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 22 3663.2008.01.1.2 www.analogictech.com ordering information battery cell voltage option battery temperature sense package marking 1 part number (tape and reel) 2 single cell (4.2v) for use with any ntc thermistor tdfn33-14 1xxyy aat3663iwo-4.2-1-t1 single cell (4.2v) for use with 10k ntc thermistor tdfn33-14 zzxyy aat3663iwo-4.2-2-t1 dual cell (8.4v) for use with any ntc thermistor tdfn33-14 1yxyy aat3663iwo-8.4-1-t1 dual cell (8.4v) for use with 10k ntc thermistor tdfn33-14 1zxyy aat3663iwo-8.4-2-t1 all analogictech products are offered in pb-free packaging. the term pb-free means semiconductor products that are in compliance with current rohs standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. for more information, please visit our website at http://www.analogictech.com/about/quality.aspx. 1. xyy = assembly and date code. 2. sample stock is generally held on part numbers listed in bold .
aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 3663.2008.01.1.2 23 www.analogictech.com aat3663 1a linear li-ion battery charger for single and dual cell applications batterymanager tm product datasheet 3663.2008.01.1.2 23 www.analogictech.com advanced analogic technologies, inc. 3230 scott boulevard, santa clara, ca 95054 phone (408) 737-4600 fax (408) 737-4611 ? advanced analogic technologies, inc. analogictech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an analogictech pr oduct. no circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. analogictech reserves the right to make changes to their products or speci cations or to discontinue any product or service without notice. except as provided in analogictech?s terms and conditions of sale, analogictech assumes no liability whatsoever, and analogictech disclaims any express or implied warranty re lating to the sale and/or use of analogictech products including liability or warranties relating to tness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right . in order to minimize risks associated with the customer?s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. testing and other quality control techniques are utilized to the extent analogictech deems necessary to support this warranty. speci c testing of all parameters of each device is not necessarily performed. analogictech and the analogictech logo are trademarks of advanced analogic technologies incorporated. all other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. package information tdfn33-14 top view bottom view 3.000 + all dimensions in millimeters. 1. the leadless package family, which includes qfn, tqfn, dfn, tdfn and stdfn, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing process. a solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.

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