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aat3689 0.5a/1.0a usb port/adapter lithium-ion/polymer battery charger 3689.2006.11.1.0 1 batterymanager ? general description the aat3689 batterymanager is a highly integrat- ed single cell lithium-ion/polymer battery charger ic designed to operate with usb port and ac adapter inputs. it requires a minimum number of external components. the aat3689 precisely regulates battery charge voltage and current for 4.2v lithium-ion/polymer bat- tery cells. adapter charge current rates may be pro- grammed up to 1.0a. in the absence of an adapter and with a usb port connected, the battery can also be charged by usb power. the usb charge current can be programmed up to 500ma. usb charging is disabled when an adapter is present. battery temperature and charge state are fully monitored for fault conditions. in the event of an over-voltage or over-temperature failure, the device will automatically shut down, thus protecting the charging device, control system, and the bat- tery under charge. status monitor output pins are provided to indicate the battery charge status by directly driving two external leds. the aat3689 is available in a pb-free, thermally- enhanced, space-saving 12-pin 3x3mm tdfn package and is rated over the -40c to +85c tem- perature range. features ? usb/ac adapter system power charger ? usb: programmable up to 500ma ? adapter: programmable up to 1.0a ? 4.0v to 5.5v input voltage range ? adapter presence automatically disables usb charging ? high level of integration with internal: ? charging devices ? reverse blocking diodes ? current sensing ? automatic recharge sequencing ? battery temperature monitoring ? full battery charge auto turn-off ? over-current protection ? over-voltage protection ? emergency thermal protection ? power on reset and soft start ? 12-pin 3x3 tdfn package applications ? cellular telephones ? digital still cameras ? hand-held pcs ? mp3 players ? personal data assistants (pdas) ? other lithium-ion/polymer battery-powered devices typical application aat3689 c2 10 f batt- temp usb input battery pack usb adp adpset ct gnd ts bat batt+ r setadp c t a dp input stat1 r setusb usbset en stat2 enable
pin descriptions pin configuration tdfn33-12 (top view) pin # name type function 1, 10 usb in usb power supply input. 2 bat in/out battery charging and sensing. 3 adp in adapter power supply input. 4 gnd ground ground connection. 5 en in enable pin. logic high enables the ic. 6 ts in/out connect to 10k ntc thermistor. 7 stat2 out battery charge status indicator pin to drive an led: active low, open-drain. 8 stat1 out battery charge status indicator pin to drive an led: active low, open-drain. 9 ct in/out timing capacitor to adjust internal watchdog timer. set maximum charge time for adapter powered trickle, cc, and cv charge modes. the watchdog timer only sets the timers for adapter battery charging; there is no timeout for the battery charging from the usb input. if timing function is not need- ed, terminate this pin to ground. 11 usbset in/out connect a resistor between this pin and gnd to set the usb charging current. 12 adpset in/out connect a resistor between this pin and gnd to set the adapter charging current. ep exposed paddle (bottom); connect to gnd directly beneath package. aat3689 0.5a/1.0a usb port/adapter lithium-ion/polymer battery charger 2 3689.2006.11.1.0 usb bat adp 1 gnd en ts adpset usbset usb ct stat1 stat2 2 3 4 5 6 12 11 10 9 8 7
absolute maximum ratings 1 thermal information 2 symbol description value units ja maximum thermal resistance 50 c/w p d maximum power dissipation 2.0 w symbol description value units v p usb, adp, <30ms, duty cycle <10% -0.3 to 7.0 v v p usb, adp continuous -0.3 to 6.0 v v n bat, usbset, adpset, stat1, stat2, ts, ct, en -0.3 to v p + 0.3 v t j operating junction temperature range -40 to 150 c t lead maximum soldering temperature (at leads) 300 c aat3689 0.5a/1.0a usb port/adapter lithium-ion/polymer battery charger 3689.2006.11.1.0 3 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at c ondi- tions other than the operating conditions specified is not implied. only one absolute maximum rating should be applied at any one time. 2. mounted on an fr4 board.
electrical characteristics 1 v adp = 5v, t a = -25c to +85c, unless otherwise noted. typical values are t a = 25c. symbol description conditions min typ max units operation v usb , v adp usb port or adapter voltage 4.0 5.5 v range v u _ dsbl adp voltage level to disable 4.25 4.5 4.7 v usb charging v uvlo under-voltage lockout rising edge 3.0 v under-voltage lockout hysteresis 150 mv i op operating current cc charge current = 500ma 0.75 1.5 ma i sleep sleep mode current v adp = 5v, usb = en = gnd 0.3 1 a v usb = 5v, adp = en = gnd 12 i leakage reverse leakage current from v bat = 4v, usb, 1.0 a bat pin adp pins open voltage regulation v bat _ eoc 1 end of charge voltage accuracy 4.158 4.2 4.242 v v bat /v bat eoc voltage tolerance 0.5 % v min preconditioning voltage threshold 2.8 3.0 3.15 v v rch battery recharge voltage v bat _ eoc - 0.1 v threshold current regulation i ch charge current 100 1000 ma i ch /i ch charge current regulation 10 % tolerance v adpset adpset pin voltage in cc mode 2.0 v v usbset usbset pin voltage in cc mode 2.0 v k iadp current set factor: i charge /i adpset 4000 k iusb current set factor: i charge /i usbset 2000 charging devices r ds(on)a adapter charging transistor v in = 5.5v 0.2 0.25 0.35 on resistance r ds(on)u usb charging transistor v in = 5.5v 0.4 0.5 0.65 on resistance aat3689 0.5a/1.0a usb port/adapter lithium-ion/polymer battery charger 4 3689.2006.11.1.0 1. the aat3689 output charge voltage is specified over the 0 to 70c ambient temperature range; operation over the -25c to +8 5c temperature range is guaranteed by design.
electrical characteristics 1 v adp = 5v, t a = -25c to +85c, unless otherwise noted. typical values are t a = 25c. symbol description conditions min typ max units logic control / protection v en(h) input high threshold (adapter) 1.6 v input high threshold (usb) 2.2 v en(l) input low threshold 0.4 v i en(h) en input current v en = 5v 10 a t p preconditioning time out (adp mode only) c ct = 100nf, v adp = 5.5v 25 minute t c preconditioning and constant current mode c ct = 100nf, v adp = 5.5v 3.0 hour time out (adp mode only) t v constant voltage mode time out c ct = 100nf, v adp = 5.5v 3.0 hour (adp mode only) v s tat output low voltage stat pin sinks 4ma 0.4 v i s tat stat pin current sink capability 8.0 ma v ovp over-voltage protection threshold 4.4 v i tk /i ch pre-charge current 10 % i ocp over-current protection threshold 105 %i chg _ cc i term /i chg charge termination threshold current 7.5 % i ts current source from ts pin 70 80 90 a ts1 ts hot temperature fault threshold 310 330 350 mv hysteresis 15 ts2 ts cold temperature fault threshold 2.2 2.3 2.4 v hysteresis 10 mv t ovsd over-temperature shutdown threshold 145 c aat3689 0.5a/1.0a usb port/adapter lithium-ion/polymer battery charger 3689.2006.11.1.0 5 1. the aat3689 output charge voltage is specified over the 0 to 70c ambient temperature range; operation over the -25c to +8 5c temperature range is guaranteed by design.
typical characteristics aat3689 0.5a/1.0a usb port/adapter lithium-ion/polymer battery charger 6 3689.2006.11.1.0 preconditioning charge current vs. temperature (r setadp = 8.06k ; r setusb = 8.06k usb adp 80 90 100 110 120 -50 -25 0 25 50 75 100 40 45 50 55 60 preconditioning voltage threshold vs. temperature temperature ( c) v min (v) usb adp 2.95 2.96 2.97 2.98 2.99 3.00 3.01 3.02 3.03 3.04 3.05 -50 -25 0 25 50 75 100 end of charge voltage vs. temperature temperature ( c) v bat_eoc (v) adp usb 4.158 4.179 4.200 4.221 4.242 -50 -25 0 25 50 75 100 battery recharge voltage threshold vs. temperature temperature ( c) v rch (v) 4.040 4.050 4.060 4.070 4.080 4.090 4.100 4.110 4.120 4.130 4.140 -50 -25 0 25 50 75 10 0 usb adp battery voltage vs. supply voltage supply voltage (v) v bat (v) usb adp 4.158 4.179 4.200 4.221 4.242 4.5 4.75 5.0 5.25 5.5 i fastcharge vs. r set r set (k ) i fastcharge (ma) 10 100 1000 10000 1 10 100 1000 usb adp
typical characteristics aat3689 0.5a/1.0a usb port/adapter lithium-ion/polymer battery charger 3689.2006.11.1.0 7 fast charge current vs. usb supply voltage (r setusb = 42.4k ) usb supply voltage (v) i ch (ma) 0 20 40 60 80 100 120 4.0 5.0 6.0 4.5 5.5 6.5 v bat = 3.3v v bat = 3.5v v bat = 3.9v fast charge current vs. usb supply voltage (r setusb = 8.06k ) usb supply voltage (v) i ch (ma) 0 100 200 300 400 500 600 4.0 4.25 4.5 4.75 5.0 5.25 5.5 5.75 6.0 v bat = 3.3v v bat = 3.5v v bat = 3.9v fast charge current vs. adapter supply voltage (r setadp = 8.06k ) adapter supply voltage (v) i ch (ma) 0 200 400 600 800 1000 1200 4.0 4.5 5.0 5.5 6.0 v bat = 3.3v v bat = 3.5v v bat = 3.9v usb charging current vs. battery voltage (r setusb = 8.06k ) battery voltage (v) i ch (ma) 0 100 200 300 400 500 600 2.5 3.5 4.5 4.0 3.0 adapter charging current vs. battery voltage (r setadp = 8.06k ) battery voltage (v) i ch (a) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 2.5 2.9 3.3 3.7 4.1 4.5 fast charge current vs. temperature (r setadp = 8.06k ; r setusb = 8.06k 900 920 940 960 980 1000 1020 1040 1060 1080 1100 -50 -25 0 25 50 75 100 440 450 460 470 480 490 500 510 520 530 540 adp usb
typical characteristics aat3689 0.5a/1.0a usb port/adapter lithium-ion/polymer battery charger 8 3689.2006.11.1.0 v il vs. supply voltage en pin (falling) supply voltage (v) v ih (v) 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0 -40 c +25 c +85 c v ih vs. supply voltage en pin (rising) supply voltage (v) v ih (v) 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6. 0 -40 c +25 c +85 c fast charge current vs. usb supply voltage (r setusb = 8.06k ) usb supply voltage (v) i ch (ma) 0 100 200 300 400 500 600 4.4 4.5 4.6 4.7 4.8 4.9 5.0 0 c 25 c 70 c ct pin capacitance vs. counter timeout time (hours) capacitance ( f) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 06 4 2810 precondition timeout precondition + constant current timeout or constant voltage timeout counter timeout vs. temperature (c t = 0.1f) temperature ( c) counter timeout (%) -10 -8 -6 -4 -2 0 2 4 6 8 10 -50 -25 0 25 50 75 100 adapter mode supply current vs. adpset resistor adpset resistor (k ) i q (ma) 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 1 10 100 1000 constant current pre-conditioning
typical characteristics aat3689 0.5a/1.0a usb port/adapter lithium-ion/polymer battery charger 3689.2006.11.1.0 9 temperature sense output current vs. temperature temperature ( c) ts pin current ( 72 74 76 78 80 82 84 86 88 -50 -25 0 25 50 75 100
functional block diagram aat3689 0.5a/1.0a usb port/adapter lithium-ion/polymer battery charger 10 3689.2006.11.1.0 functional description the aat3689 is a highly integrated single cell lithi- um-ion/polymer battery charger ic designed to operate with usb port and ac adapter inputs, while requiring a minimum number of external components. the aat3689 precisely regulates battery charge voltage and current for 4.2v lithium- ion/polymer battery cells. the adapter charge input constant current level may be programmed up to 1.0a for rapid charging applications. in the absence of a high current adapter input source, the aat3689 may be pow- ered from a usb port v bus supply. the usb con- stant charge current can be externally pro- grammed for maximum constant current charge levels up to 500ma. the usb charge function is automatically disabled when an adapter input power source greater than 4.5v is present. status monitor output pins are provided to indicate the battery charge status by directly driving two external leds. battery temperature and charge state are fully mon- itored for fault conditions. in the event of an over- voltage or over-temperature failure, the device will automatically shut down, thus protecting the charg- ing device, control system, and the battery under charge. in addition to internal charge controller ther- mal protection, the aat3689 also provides a tem- perature sense feedback function (ts pin) from the battery to shut down the device in the event the bat- tery exceeds its own thermal limit during charging. charging operation regardless of which charge input function is select- ed (i.e., either the adapter input or usb input), the aat3689 has four basic modes for the battery charge cycle: pre-conditioning/trickle charge; con- stant current/fast charge; constant voltage; and end of charge (see figure 1). charge control current compare reverse blocking reverse blocking cv/ precharge usb constant current current compare adp bat a dpset uvlo over- temperature protection charge status stat2 stat1 ts window comparator 80ua usbset watchdog timer ct gnd voltage sense en ic enable
aat3689 0.5a/1.0a usb port/adapter lithium-ion/polymer battery charger 3689.2006.11.1.0 11 figure 1: current vs. voltage profile during charging phases. battery preconditioning before the start of charging, the aat3689 checks several conditions in order to assure a safe charging environment. the input supply must be above the minimum operating voltage, or under-voltage lock- out threshold (v uvlo ), for the charging sequence to begin. also, the cell temperature, as reported by a thermistor connected to the ts pin from the battery, must be within the proper window for safe charging. when these conditions have been met and a battery is connected to the bat pin, the aat3689 checks the state of the battery. if the cell voltage is below the preconditioning voltage threshold (v min ), the aat3689 begins preconditioning the cell. the battery preconditioning trickle charge current is equal to the fast charge constant current divided by 10. for example, if the programmed fast charge cur- rent is 500ma, then the preconditioning mode (trick- le charge) current will be 50ma. cell preconditioning is a safety precaution for a deeply discharged bat- tery and also aids in limiting power dissipation in the pass transistor when the voltage across the device is at the greatest potential. fast charge / constant current charging the cell preconditioning continues until the voltage on the bat pin exceeds the preconditioning voltage threshold (v min ). at this point, the aat3689 begins the constant-current fast charging phase. the fast charge constant current (i cc ) amplitude is deter- mined by the charge mode, adp or usb, and is pro- grammed by the user via the r setadp and r setusb resistors. the aat3689 remains in constant current charge mode until the battery reaches the voltage regulation point, v bat_eoc . constant voltage charging the system transitions to a constant voltage charg- ing mode when the battery voltage reaches output charge regulation threshold (v bat_eoc ) during the constant current fast charge phase. the regulation voltage level is factory programmed to 4.2v (1%). the charge current in the constant voltage mode drops as the battery cell under charge reaches its maximum capacity. end of charge cycle termination and recharge sequence when the charge current drops to 7.5% of the pro- grammed fast charge current level in the constant voltage mode, the device terminates charging and goes into a standby state. the charger will remain in a standby state until the battery voltage decreas- es to a level below the battery recharge voltage threshold (v rch ). when the input supply is disconnected or drops below uvlo or en = 0, the charger will automatical- ly enter power-saving sleep mode. consuming an ultra-low 0.3 a in sleep mode, the aat3689 mini- mizes battery drain when it is not charging. this fea- ture is particularly useful in applications where the input supply level may fall below the battery charge or under-voltage lockout level. in such cases where the aat3689 input voltage drops, the device will enter the sleep mode and automatically resume charging once the input supply has recovered from its fault condition. preconditioning trickle charge phase constant current charge phase constant voltage charge phase charge complete voltage constant current mode voltage threshold regulated current trickle charge and termination threshold i = cc / 10 i = max cc
aat3689 0.5a/1.0a usb port/adapter lithium-ion/polymer battery charger 12 3689.2006.11.1.0 system operation flow chart no no yes yes no no yes no yes no yes yes usb charge completed charge completed adp yes set expire power on reset power select no yes timing adp loop no no enable recharge test v rch > v bat voltage phase test i bat > i term current phase test v eoc > v bat preconditioning test v min > v bat battery temp. monitor v ts1 < ts < v ts2 fault conditions monitor ov, ot usb loop voltage charging mode current charging mode low current conditioning charge battery temp. fault charge safety timer shutdown mode sleep mode switch on uvlo v p > v uvlo
aat3689 0.5a/1.0a usb port/adapter lithium-ion/polymer battery charger 3689.2006.11.1.0 13 application information ac adapter / usb system power charging adapter mode in the adapter mode, constant current charge lev- els up to 1.0a may be programmed by the user. the aat3689 system control will always select the adapter input over the usb supply input whenever adapter voltage is present on the adp pin. the aat3689 will operate from the adapter input over a 4.0v to 5.5v range. the constant current fast charge current for the adapter input mode is set by the r setadp resistor connected between the adpset pin and ground. refer to table 1 for recommended r setadp values for a desired constant current charge level. the precise charging function in the adapter mode may be read from the status leds. please refer to the battery charge status indication discussion in this datasheet for further details. adapter input charge inhibit and resume the aat3689 has an under-voltage lockout and power on reset feature so that if the input supply to the adapter pin drops below the uvlo threshold the charger will suspend charging and shut down. when power is re-applied to the adapter pin or the uvlo condition recovers and v adp > v bat , the sys- tem 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. usb mode the aat3689 provides an input for intelligent usb charging. when no voltage is present on the adapter input pin, the charge controller will auto- matically switch to accepting power from the usb input. the usb charge may be user programmed to any level between 50ma and 500ma by select- ing the appropriate resistor values for r setusb . refer to table 1 for recommended r setusb values for the desired usb input constant current charge levels. table 1: resistor values. usb input charge inhibit and resume the aat3689 uvlo and power on reset feature will function when the usb input pin voltage level drops below the uvlo threshold. at this point, the charger will suspend charging and shut down. when power is re-applied to the usb pin or the uvlo condition recovers, the system charge con- trol 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. enable / disable the aat3689 provides an enable function to con- trol the charger ic on and off. the enable (en) pin is active high. when pulled to a logic low level, the aat3689 will be shut down and forced into the sleep state. charging will be halted regardless of the battery voltage or charging state. when the device is re-enabled, the charge control circuit will automatically reset and resume charging functions with the appropriate charging mode based on the battery charge state and measured cell voltage. programming charge current the fast charge constant current charge level for both adapter and usb input modes are pro- grammed with set resistors placed between the adpset and usbset pins and ground. the accu- racy of the fast charge is dominated by the toler- ance of the set resistor used. for this reason, 1% adp usb i cc r set (k )r set (k ) 50 n/a 86.6 75 n/a 57.6 100 84.5 42.2 200 43.2 21.0 300 28.0 13.7 400 21.0 10.2 500 16.9 8.06 600 13.3 n/a 700 11.5 n/a 800 10.2 n/a 900 9.09 n/a 1000 8.06 n/a
aat3689 0.5a/1.0a usb port/adapter lithium-ion/polymer battery charger 14 3689.2006.11.1.0 tolerance metal film resistors are recommended for the set resistor function. adp fast charge constant current levels from 100ma to 1.0a may be set by selecting the appropriate resistor value from table 1. the usb charge may be set to any level between 50ma and 500ma depending upon the system design requirements for a given usb charge appli- cation. refer to table 1 and figure 2 for recom- mended r setusb values. figure 2: i fastcharge vs. r set . protection circuitry programmable watchdog timer the aat3689 contains a watchdog timing circuit for the adapter input charging mode. no watchdog tim- ing functions are active for the usb input mode. 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 a shutdown condition if the trickle charge mode exceeds 25 minutes or the combined trickle charge plus fast charge mode exceeds three hours. when the device transitions to the constant voltage mode, the timing counter is reset and will time out after three hours and shut down the charger. table 2: summary for a 0.1 f 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 time-out times would be doubled. if the programmable watchdog timer function is not needed, it may be disabled by connecting the ct pin to ground. the ct pin should not be left float- ing or un-terminated, 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 capacitance value. therefore, the timing capacitor should be physical- ly located on the printed circuit board layout as closely as possible to the ct pin. since the accu- racy of the internal timer is dominated by the capacitance value, 10% tolerance or better ceram- ic capacitors are recommended. ceramic capacitor materials such as x7r and x5r type 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 max- imum battery charge voltage and is set by the over- voltage protection threshold (v ovp ). if an over-volt- age condition occurs, the aat3689 charge control will shut down the device until voltage on the bat pin drops below the over-voltage protection thresh- old (v ovp ). the aat3689 will resume normal charg- ing operation after the over-voltage condition is removed. during an over-voltage event, the stat leds will report a system fault. over-temperature shutdown the aat3689 has a thermal protection control cir- cuit which will shut down charging functions should the internal die temperature exceed the preset thermal limit threshold. battery temperature fault monitoring in the event of a battery over-temperature condi- tion, the charge control will turn off the internal pass device. the stat leds will display a system fault. after the system recovers from a temperature fault, the device will resume charging operation. mode time trickle charge (tc) time out 25 minutes trickle charge (tc) + 3 hours fast charge (cc) time out constant voltage (vc) mode 3 hours time out r set (k ) i fastcharge (ma) 10 100 1000 10000 1 10 100 1000 usb adp
aat3689 0.5a/1.0a usb port/adapter lithium-ion/polymer battery charger 3689.2006.11.1.0 15 the aat3689 checks battery temperature before starting the charge cycle, as well as during all stages of charging. this is accomplished by moni- toring the voltage at the ts pin. this system is intended to use negative temperature coefficient (ntc) thermistors, which are typically integrated into the battery package. most commonly used ntc thermistors used in battery packs are approx- imately 10k at room temperature (25c). the ts pin has been specifically designed to source 80 a of current to the thermistor. the volt- age on the ts pin that results from the resistive load should stay within a window from 330mv to 2.30v. if the battery becomes too hot during charg- ing due to an internal fault, the thermistor will heat up and reduce in value, thus pulling the ts pin volt- age lower than the t s1 threshold and the aat3689 will signal the fault condition. if the use of the ts pin function is not required by the system, it should be terminated to ground using a 10k resistor. battery charge status indication the aat3689 has two status led driver outputs. these two leds can indicate simple functions such as no battery charge activity, battery charg- ing, charge complete, and charge fault. status indicator display simple system charging status may be displayed using one or two leds in conjunction with the stat1 and stat2 pins on the aat3689. these two pins are simple switches to connect the led cath- odes to ground. it is not necessary to use both dis- play leds if a user simply wants to have a single lamp to show "charging" or "not charging." this can be accomplished by using the stat1 pin and a sin- gle led. using two leds and both stat pins sim- ply gives the user more information to the charging states. refer to table 3 for led display definitions. the led anodes should be connected to either v usb or v adp , depending upon the system design requirements. the leds should be biased with as little current as necessary to create reasonable illu- mination; therefore, a ballast resistor should be placed between the led cathodes and the stat1/2 pins. led current consumption will add to the overall thermal power budget for the device package, so it is wise 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 recom- mended to exceed 8ma for driving an individual status led. the required ballast resistor value can be estimated using the following formulas: for connection to the adapter supply: example: note: red led forward voltage (v f ) is typically 2.0v @ 2ma. for connection to the usb supply: example: note: green led forward voltage (v f ) is typically 3.2v @ 2ma. the status led display conditions are described in table 3. r b(stat2) = = 900 5.0v - 3.2v 2ma r b(stat1/2) = v usb - v f(led) i led(stat1/2) r b(stat1) = = 1.75k 5.5v - 2.0v 2ma r b(stat1/2) = v adp - v f(led) i led(stat1/2)
aat3689 0.5a/1.0a usb port/adapter lithium-ion/polymer battery charger 16 3689.2006.11.1.0 table 3: status led display conditions. event description stat1 stat2 charge disabled or low supply off off charge enabled without battery flash 1 flash 1 battery charging on off charge completed off on fault on on 1. flashing rate depends on output capacitance. capacitor selection input capacitor in general, it is good design practice to place a decoupling capacitor between the adp and usb pins 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 aat3689 adapter input is to be used in a sys- tem with an external power supply source, such as a typical ac-to-dc wall adapter, then a c in capaci- tor in the range of 10 f should be used. a larger input capacitor in this application will minimize switching or power bounce effects when the power supply is "hot plugged." likewise, a 10 f or greater input capacitor is recommended for the usb input to help buffer the effects of usb source power switching, noise, and input cable impedance. output capacitor the aat3689 only requires a 1 f ceramic capaci- tor 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 aat3689 is to be used in applications where the battery can be removed from the charger, such as in the case of desktop charging cradles, an output capacitor greater than 10 f may be required to prevent the device from cycling on and off when no battery is present. printed circuit board layout considerations for the best results, it is recommended to physical- ly place the battery pack as close to the aat3689 bat pin as possible. to minimize voltage drops on the pcb, keep the high current carrying traces ade- quately wide. for maximum power dissipation of the aat3689 tdfn package, the metal substrate should be solder bonded to the board. it is also rec- ommended to maximize the substrate contact to the pcb ground plane layer to further increase local heat dissipation.
aat3689 evaluation board layout figure 5: aat3689 evaluation board figure 6: aat3689 evaluation board component side layout. solder side layout. aat3689 evaluation board schematic diagram aat3689 0.5a/1.0a usb port/adapter lithium-ion/polymer battery charger 3689.2006.11.1.0 17 d2 d1 r1 8.06k r5 1.5k r4 1.5k r3 10k r2 8.06k c4 0.1 f bav74lt1 bav74lt1 ds1 (a) ds1 (b) bat adp usb ct ts 1 2 3 on/off j1 gnd 4 usb 1 bat 2 adp 3 usbset 11 en 5 usb 10 ts 6 ct 9 stat2 7 stat1 8 adpset 12 aat3689 u1 j2 0 c1 10 f c2 10 f c3 10 f grn led red led
aat3689 evaluation board bill of materials component part number description manufacturer u1 aat3689ifp-4.2-t1 0.5a/1.0a usb port/adapter analogictech lithium-ion/polymer battery charger; 12-pin 3x3 tdfn package r1, r2 chip resistor 8.06k , 1%, 1/4w; 0603 vishay r3 chip resistor 10k , 5%, 1/4w; 0603 vishay r4, r5 chip resistor 1.5k , 5%, 1/4w; 0603 vishay c1, c2, c3 grm21br61a106ke19 cer 10 f 10v 10% x5r 0805 murata c4 grm188r71c104ka01 cer 0.1 f 16v 10% x7r 0603 murata jp1 prpn401paen conn. 3-pin header, 2mm zip sullins electronics jp2 chip resistor 0 vishay d1 cmd15-21src/tr8 red led; 1206 chicago miniature lamp d2 cmd15-21vgc/tr8 green led; 1206 chicago miniature lamp ds1 (a, b) bav74lt-a default diode; sot23-3 on semi aat3689 0.5a/1.0a usb port/adapter lithium-ion/polymer battery charger 18 3689.2006.11.1.0
aat3689 0.5a/1.0a usb port/adapter lithium-ion/polymer battery charger 3689.2006.11.1.0 19 ordering information package information 3 tdfn33-12 all dimensions in millimeters. package marking 1 part number (tape and reel) 2 tdfn33-12 rqxyy aat3689iwp-4.2-t1 1. xyy = assembly and date code. 2. sample stock is generally held on part numbers listed in bold . 3. 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 re quired to ensure a proper bottom solder connection. top view bottom view detail "a" side view 3.00 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/pbfree.
aat3689 0.5a/1.0a usb port/adapter lithium-ion/polymer battery charger 20 3689.2006.11.1.0 advanced analogic technologies, inc. 830 e. arques avenue, sunnyvale, ca 94085 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 specifi cations or to discontinue any product or service without notice. customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information b eing relied on is current and complete. all products are sold sub- ject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. analogictech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with anal ogictech?s standard warranty. testing and other quality con- trol techniques are utilized to the extent analogictech deems necessary to support this warranty. specific testing of all param eters of each device is not necessarily performed. analogictech and the analogictech logo are trademarks of advanced analogic technologies incorporated. all other brand and produ ct names appearing in this document are regis- tered trademarks or trademarks of their respective holders.

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