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1 ? fn6606.2 ISL9219 li-ion battery charger the ISL9219 is a fully integrated high input voltage single-cell li-ion battery charger. this charger is fully in compliance with the usb electrical specification. the charger performs the cc/cv ch arge function required by li-ion batteries. the charger accepts an input voltage up to 28v but is disabled when the input voltage exceeds the ovp threshold, typically 6v, to prevent excessive power dissipation. the 28v rating eliminates the overvoltage protection circuit required in a low input voltage charger. the fast charge current is programmable with an external resistor, and the end-of-charge (eoc) current is fixed at 50ma for any input source type. when the input power source is identified as a usb port, the host controller will further identify the power type of the port and drive the usbi pin accordingly. when the battery voltage is lower than the pre-charge threshold, which is also programmable with an external resistor, the charger precondi tions the battery with an 85ma constant current. charge is comp lete when the charge current reduces to the eoc current leve l during the cv charge phase. the stat1 and stat2 provide unique indication for each charging condition. an internal thermal foldback function protects the charger from any thermal failure. the stat1, stat2, trkl and acflt pins are of open drain type, allowing a simple interface to a microprocessor or an led. when no adapter is attached or when disabled, the charger draws less than 1a leakage current from the battery. additional features include an ovp protected power-good source, preconditioning of an over-discharged battery, an ntc thermistor interface for ch arging the battery in a safe temperature range, automati c recharge, and thermally enhanced qfn package. features ? complete charger for single-cell li-ion/polymer batteries ? integrated pass elemen t and current sensor ? no external blocking diode required ? low component count and cost ? 0.7% voltage accuracy ? programmable charge currents ? 250a (typ) suspend quiescent current ? usb 100ma/500ma comply ? charge current thermal foldback for thermal protection ? trickle charge for fully discharged batteries ? 28v maximum voltage for the power input ? charge status indication ? less than 1a leakage current off the battery when no input power attached or charger disabled ? ambient temperature range: -40c to +85c ? pb-free (rohs compliant) related literature ? technical brief tb363 ?guidelines for handling and processing moisture sensit ive surface mount devices (smds)? ? technical brief tb379 ?thermal characterization of packaged semiconductor devices? ? technical brief tb389 ?pcb land pattern design and surface mount guidelines for qfn packages? pinout ISL9219 (20 ld 3x4 qfn) top view ordering information part number part marking temp. range (c) package pkg. dwg. # ISL9219irz* 219 -40 to +85 20 ld 3x4 qfn l20.3x4 *add ?-t? suffix for tape and reel. please refer to tb347 for details on reel specifications. note: these intersil pb-free pl astic packaged products employ special pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate pl us anneal (e3 termination finish, which is rohs compliant and compatible with both snpb and pb-free soldering operations). intersil pb-fr ee products are msl classified at pb-free peak reflow temperatures that meet or exceed the pb-free requirements of ipc/jedec j std-020. vin nc vout nc prech acflt en iset vin ac_in trkl usbi stat1 vout pg nc ts timer 1 2 3 4 5 78910 16 15 14 13 12 20 19 18 17 stat2 gnd 611 data sheet april 7, 2010 caution: these devices are sensitive to electrosta tic discharge; follow proper ic handling procedures. 1-888-intersil or 1-888-468-3774 | intersil (and design) is a registered trademark of intersil americas inc. copyright intersil americas inc. 2008, 2010. all rights reserved all other trademarks mentioned are the property of their respective owners.
2 fn6606.2 april 7, 2010 absolute maximum rati ngs thermal information supply voltage (vin) . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3v to 30v output pin voltage (stat1, stat2, pg, acflt) . . . . . . -0.3v to 7v all other pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3v to 5.5v maximum output current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5a recommended operating conditions ambient temperature range . . . . . . . . . . . . . . . . . . .-40c to +85c maximum supply voltage, vin . . . . . . . . . . . . . . . . . . . . . . . . . .28v supply voltage, vin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3v to 6v programmable charge current . . . . . . . . . . . . . . . . . . . 50ma to 1a thermal resistance (junction to ambient) ja (c/w) jc (c/w) 3x4 qfn package (notes 1, 2) . . . . 41 4.5 maximum junction temperature (plastic package) . . . . . . . +150c maximum storage temperature range . . . . . . . . . .-65c to +150c pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . .see link below http://www.intersil.com/pbfree/pb-freereflow.asp caution: do not operate at or near the maximum ratings listed fo r extended periods of time. exposure to such conditions may adv ersely impact product reliability and result in failures not covered by warranty. notes: 1. ja is measured in free air with the component mounted on a high ef fective thermal conductivity te st board with ?direct attach? fe atures. see tech brief tb379. 2. jc , ?case temperature? location is at the center of the exposed metal pad on the package underside. see tech brief tb379. electrical specifications typical values are tested at vin = 5v and +25c am bient temperature, maximum and minimum values are established over the recommended operati ng conditions, unless otherwise noted. parameter symbol test conditions min typ max units power-on reset rising vin threshold v por 3.4 3.6 3.8 v falling vin threshold v por 2.2 2.4 2.6 v vin-bat offset voltage rising edge v os - 90 150 mv falling edge v os 10 50 - mv ac fault detection threshold ac fault threshold v acflt 4.3 4.4 4.5 v standby current vout pin sink current i leak v in < v por or en = hi - 1 5.0 a vin pin supply current i standby v out floating and en = hi - 250 300 a vin pin supply current i run v out floating and en = lo - 1 2 ma voltage regulation output voltage v ch t a = +25c, i out = 0ma 4.185 4.20 4.215 v output voltage v ch i out = 0ma 4.169 4.20 4.231 v dropout voltage v out = 4.2v, i out = 1a - 300 430 mv overvoltage protection overvoltage protection rising threshold v ovpr 5.64 6.0 6.36 v overvoltage protection falling threshold v ovpf 5.54 5.6 - v output current constant charge current i charge ac input r iset = 24k 0.9 1.0 1.1 a output current set voltage v iset 2.364 2.4 2.436 v constant charge current i charge usbi = hi 380 430 490 ma constant charge current i charge usbi = lo or floating 65 85 95 ma trickle charge current i trickle for any input type 65 85 95 ma ISL9219
3 fn6606.2 april 7, 2010 end-of-charge threshold i min for any input type 30 50 70 ma recharge threshold recharge voltage threshold v rech 4.05 4.1 4.15 v trickle charge threshold trickle charge threshold voltage v min prech is floating 2.9 3.0 3.1 v trickle charge threshold voltage v min rprech = 82.5k 2.375 2.475 2.575 v trickle charge threshold hysteresis v min_hys 35 60 150 mv temperature monitoring constant current source for ts i ts 4.8 5.0 5.3 a low battery temperature threshold v tmin 1.86 1.88 1.91 v high battery temperature threshold v tmax 0.145 0.16 0.175 v battery removal threshold v rmv -2.25- v charge current foldback threshold t fold -125- c current foldback gain g fold -100-ma / c oscillator oscillation period t osc c time = 15nf 2.5 3.0 3.3 ms de-glitch time de-glitch time for eoc, recharge t deg 40 100 170 ms logic input and output input high (usbi, en , ac_in) 1.4 - - v input low (usbi, en , ac_in) --0.4v open drain leakage current when hi (stat1, stat2, acflt, trkl) pin voltage = 6v - - 1 a open drain sink current when low (stat1, stat2, acflt, trkl) pin voltage = 0.3v 20 - - ma vin to pg switch pmosfet on-resistance r ds(on) -35 maximum output current i pg -60-ma electrical specifications typical values are tested at vin = 5v and +25c am bient temperature, maximum and minimum values are established over the recommended operati ng conditions, unless otherwise noted. (continued) parameter symbol test conditions min typ max units ISL9219
4 fn6606.2 april 7, 2010 pin descriptions vin (pins 1, 20) input supply voltage, connect a 1f ceramic capacitor to power ground. usbi (pin 2) usb power type selection logic input. when this pin is left floating or driven to logic low, the usb port is regarded as a low-power port with 100ma maximum output current. in such cases, the charge current is internally set to 85ma. when this pin is driven to logic high, the usb port is considered a high-power port with a 500ma maximum current available. in such cases, the charge current is set at 430ma regardless of the iset resistor. there is a 600k pull-down resistor between the usbi pin to gnd. ac_in (pin 3) input source type config uration pin. pull this pin to logic hi to configure the charger for an ac adapter. if this pin is left floating or driven to logic lo, the charger is configured for usb source type, where the charge current is set at 430ma or 85ma, depending on the usbi status. there is a 600k pull-down resistor between the ac_in pin to gnd. trkl (pin 4) open-drain indication pin which turns on when charger is in trickle mode, otherwise turns off. this pin is capable to sink 20ma minimum current to drive an led. stat1 (pin 5) open-drain indication pin. in conjunction with stat2 this pin provides a unique indication for each charging state of the cycle. this pin is capable to sink 20ma minimum current to drive an led. stat2 (pin 6) open-drain indication pin. in conjunction with stat1 this pin provides a unique indication for each charging state of the cycle. this pin is capable to sink 20ma minimum current to drive an led. prech (pin 7) pre-charge threshold voltage programming input pin. connect a resistor between th is pin and gnd to set the threshold voltage by equation 1: where r prech is in k , valid for r prech 100k . iset (pin 8) charge-current programing and monitoring pin. connect a resistor between this pin and the gnd pin to set the charge current limit by equation 2: where r iset is in k . the iset pin voltage also monitors the actual charge current during the entire charge cycle, in cluding the trickle, constant- current, and constant-voltage phases. however, when the dropout voltage is reached, the iset pin voltage will no longer follow the output current due to fact that the output current is no longer controlled by the ic. when disabled, viset = 0v acflt (pin 9) open-drain indication pin which turns off when the adapter plugged in does not have su fficient current rating and the resulting input voltage is dropped to below 4.4v. this pin is capable to sink 20ma minimum current to drive an led. the open drain indication also turns off when an input ovp condition (vin > 6v) is encountered. en (pin 10) ic enable input. drive this pin to logic lo or leave it floating to enable the charger. drive this pin to logic hi to disable the charger. there is a 600k pull-down resistor between the en pin to gnd. pg (pin 14) the pg pin will be connected to vin through an internal p-channel mosfet when vin is within the power good window. otherwise the pg pin is in a high impedance (floating) state. when vin is within the power good window, the pg pin can source 20ma output current for the down stream circuit. it is recommended that a 2.2f ceramic capacitor be connected at the pg pin to absorb any transient voltage due to the delay turning off the pmos under a fast ovp condition. ts (pin 15) input for an external ntc thermistor for temperature monitoring. a 5a internal current source is provided at this pin and the pin voltage is monitored and compared with the set thresholds to provide over temperature protection. timer (pin 12) the timer pin sets the oscillation period by connecting a timing capacitor between this pin and gnd. the oscillator also provides a time reference for the charger. the timer function can be disabled by connecting the timer pin to gnd. if the timer is disabl ed, there will be no timeout function for any operation mode including trickle charge and fast charge modes. v prech 3r prech 100 --------------------------------- - v () = (eq. 1) i out 24000 r iset ---------------- - ma () = (eq. 2) ISL9219
5 fn6606.2 april 7, 2010 vout (pins 16, 17) charger output pin. connect this pin to the battery. a 1f or larger x5r ceramic capacitor is recommended for decoupling and stability purposes. gnd (pin 11) system ground connection nc (pins 13, 18, 19) no connect epad exposed pad. connect to gnd electrically. thermally, connect as much as possible copper to this pad either on the component layer or other layers through thermal vias to enhance the thermal performance. typical application ISL9219 to batt vin vout c 1 c 2 en dis pg to input source usbi gnd r 1 en r 2 d 1 r 3 d 2 r 4 d 3 r 5 to down stream circuit acflt stat1 stat2 ac_in 500ma 100ma ac ac/usb ts iset precg timer r 6 r 7 r t c t * * see input and output capacitor selection trkl d 4 ISL9219
6 fn6606.2 april 7, 2010 block diagram logic stat1 i sen vin vout 100000:1 current mirror counter + - + - v min + - + - v ch iset + - stat2 recharge minbat v rechrg ca va min_i i r i sen i min chrg + - + - input_ok v por trickle/fast references vout temperature monitoring current references i t timer osc gnd vin v ch v min v por v rechrg q main q sen r iset c 1 = 20ma + 80mv - en vin r prech prech ts usbi pg acflt trkl ac_in 5a vin r 1 r 2 ISL9219
7 fn6606.2 april 7, 2010 theory of operation the ISL9219 is an integrated charger for single-cell li-ion or li-polymer batteries. the isl921 9 functions as a traditional linear charger when powered with a voltage-source adapter. when powered with a current-lim ited adapter, the chargers minimizes the thermal dissipation commonly seen in traditional linear chargers. as a linear charger, the ISL9219 charges a battery in the popular constant current (cc) and constant voltage (cv) profile. the constant charge current i set is programmable up to 1a with an external resistor. the charge voltage v ch has 0.7% accuracy over the entire recommended operating condition range. the charger always preconditions the battery with a 85ma constant current at the beginning of a charge cycle, until the battery voltage is ve rified to be above the minimum fast charge voltage, v min . this low-current preconditioning charge mode is named trickle mode. a thermal-foldback feature removes the thermal concern typically seen in linear chargers. the charger reduces the charge current automatically as the ic internal temperature rises above +125c to prevent further temperature rise. the thermal foldback feature guarantees safe operation when the printed circuit board (pcb) is space limited for adequate thermal dissipation. usb compliant current setting the ISL9219 is fully compliant with the usb electrical specification when a usb port is used as the input source. the input source type can be identified by the host controller. when the usb connector is plugged in, the host controller will identify the device during the enumeration process. the host controller will further identif y whether the usb port is a high power port (500ma max current) or low power port (100ma max current). the host controller will then drive the ac_in and usbi pins thru its gpio pins, according to the identification results. if usb compliance is not required, the ac_in pin can be hard wired to vout so that the fast charge current is always set by iset pin. depending on the input source type, the charge current during the constant current phase is: iset: determined by riset if input is an ac adapter iset = 430ma if input is a high power usb port iset = 85ma if input is a low power port power-good range the power-good range is defined by the following three conditions: 1. vin > vovp 2. vin - vbat > vos 3. vin < vovp where the vos is the offset vo ltage for the input and output voltage comparator and the vovp is the overvoltage protection threshold given in the ?electrical specification? table on page 2. all v por , v os , and v ovp have hysteresis, as given in the electrical sp ecification table. if the input voltage is not in the power-good range, the charger will not charge the battery. if the input voltage is within the power good range, the pg pin will be connected to vin through an internal p-channel mosfet wit h a 20ma current capability. if the input voltage is not within the power-good range, the pg will be switched off from vin and turned into a high impedance (floating) state. wh en an overvoltage condition occurs, the ISL9219 enters the suspended state. timeout function the charger offers a safety timer for setting the maximum charge time (timeout) limit to prevent charging a dead battery for an extensively long time. the trickle mode is limited to 1/8 of timeout limi t. the charger automatically re-charges the battery when the battery voltage drops below a recharge threshold. state indication five indication pins, stat1, stat2, acflt, pg and trkl are available from the charger to indicate the charge status and fault conditions. the stat1 and stat2 are configured to indicate various charging condition as given by the true table in table 1: a fault status is triggered un der one of these conditions: 1. the ts pin voltage is out side the preset temperature window 2. timeout occurs before the eoc current has been reached the acflt pin indicates a faulty ac adapter condition. it is an open drain output which turns off when there is an ac fault, otherwise stays on. an ac fault condition is defined as when vin falls below vacflt threshold (4.4v) or vin goes above vovp (6.0v). the trkl pin indicates that the operation is in trickle charge mode. it is an open drain output which turns on when the operation is in trickle mode, otherwise turns off. the pg pin indicates that vin is within the power-good range. table 1. stat1 and stat2 true table stat1 stat2 charging condition l l charging l h charge complete and during re-charge h l fault h h suspend ISL9219
8 fn6606.2 april 7, 2010 applications information power on reset (por) the ISL9219 resets as the input voltage rises above the por rising threshold. the internal oscillator starts to oscillate, the internal timer is reset, and the charger begins to charge the battery. the stat pins, will indicate the operating condition according to table 1. the ISL9219 has a typical rising por threshold of 3.6v and a falling por threshold of 2.4v. pre-charge if the battery voltage is belo w the pre-charge threshold, the ISL9219 charger delivers a smal l current to pre-charge the battery until the voltage reaches the fast charge threshold value. the pre-charge threshold is programmed by the resistor connected between t he prech pin and gnd. if the prech pin is left floating, a de fault value of 3.0v is used as the pre-charge voltage. charge cycle a charge cycle consists of three charge modes: trickle mode, constant current (cc) mode, and constant voltage (cv) mode. the charge cycle always starts with the trickle mode until the battery voltage stays above v min (3.0v typical). if the battery voltage stays below v min , the charger stays in the trickle mode. the charger moves to the cc mode after the battery voltage is above v min . as the battery-pack terminal voltage rises to the final charge voltage (v ch ), the cv mode begins. since the battery terminal voltage is regulated at the constant v ch in the cv mode, the charge current is expected to decline as the cell voltage rises. after the charge current drops below i min , which is fixed at 50ma for any input type, the ISL9219 indicates the end-of-charge (eoc) with stat1 and stat2. the charging actually does not terminate until the internal timer completes its length of timeout in order to bring the battery to its full capacity. the following events init iate a new charge cycle: ?por ? a new battery being inserted (detected by ts pin) ? recovery from an battery over-temperature fault ?the en pin is toggled from hi to lo or from hi to floating recharge after a charge cycle completes at a timeout event, charging is prohibited until the rechar ge condition (vout < vrech) is met. then the charging rest arts with the timer reset to zero. the stat1 and stat2 indication however, is unchanged. internal oscillator the internal oscillator establishes a timing reference. the oscillation period is programm able with an external timing capacitor, c time , as shown in ?typical application? on page 5. the oscillator charges the timing capacitor to 1.5v and then discharges it to 0.5v in one period, both with 10a current. the period t osc is shown in equation 3: a 1nf capacitor results in a 0.2ms oscillation period. the accuracy of the period is mainly dependent on the accuracy of the capacitance and the internal current source. total charge time the total charge time for the cc mode and cv mode is limited to a length of timeout. a 22-stage binary counter increments each oscillation period of the internal oscillator to set the timeout. the timeout can be calculated as equation 4: a 1nf capacitor leads to 14 minutes of timeout. for example, a 15nf capacitor sets the timeout to be 3.5 hours. the charger has to reach the end-of-charge condition before the timeout, otherwise, a timeout fault is issued. the timeout fault latches up the charger. there are two ways to release such a latch-up: either to recycle the input power, or toggle the en pin to disable the charger and then re-enable it. the trickle mode charge has a time limit of 1/8 timeout. if the battery voltage does not reach v min within this limit, a timeout fault is issued and the charger latches up. thus, the charger can stay in trickle mode for no more than 1/8 of timeout interval. monitoring output current thru iset pin in addition to programming the fast charge current, the iset can be used to monitor the actual output current for the ac adapter input current setting. during the constant current phase, the iset pin voltage is fixed at 2.4v. in this case, the output current can be calculated by using 2.4v divided by r iset . during the constant voltage phase, the output current can be calculated by using the pin voltage, divided by r iset. for usb input current setting, viset can still be used to monitor the charge current but since viset is not used for the close loop current regul ation, to achieve a good accuracy, an one-point calibration is required. end-of-charge (eoc) current the end-of-charge current i min sets the level at which the charger starts to indicate the charge complete condition with the indication pins. the charger actually does not terminate charging until the end of the timeout interval, as described in ?total charge time? on page 8. the i min is fixed at 50ma for all input types, i.e. for ac adapter, usb high power and usb low power. t osc 0.2 10 6 c time ? ? = onds sec () (eq. 3) timeout 2 22 t osc 14 c time 1nf ----------------- - ? = ? = minutes () (eq. 4) ISL9219
9 fn6606.2 april 7, 2010 charge current thermal foldback overheating is always a major concern in a linear charger. the maximum power dissipation usually occurs at the beginning of a charge cycle when th e battery voltage is at its minimum but the charge current is at its maximum. the charge current thermal foldback function in the ISL9219 eliminates the overheating problem. the thermal foldback function has no impact on the charge current until the internal temperature reaches approximately +125c; then charge current is reduced at a rate of 100ma/c. for a charger with t he constant charge current set at 1a, the charge current is reduced to zero when the internal temperature rises to +135c. ovp protection the ISL9219 is capable for up to 28v at the input pin. however, reliability reason, the charger will stop charging should the input voltage exceed 6v. this feature prevents excessive heating generated by the high input voltages. if an ovp condition is encountered, the pg pin will turn to high impedance to indicate the ovp condition, the changer enters the suspend state and the acflt turns to high impedance. if vin is within the power good range, the pg pin is connected to vin pin internally to provide a 20ma supply current to the down stream circuit. ntc thermistor the ISL9219 provides a ts pin to monitor the battery temperature to ensure a safe charging temperature range. the temperature range is prog rammable with an external negative temperature coefficient (ntc) thermistor. the temp pin is also used to detect the removal of the battery. the ISL9219 uses two comparators (cp2 and cp3) to form a window comparator, as shown in figure 2. when the ts pin voltage is ?out of the wi ndow,? determined by the v tmin and v tmax , the ISL9219 stops charging and indicates a fault condition. when the temperature returns to the set range, the charger re-starts a charge cycl e. the two mosfets, q1 and q2, produce hysteresis for both upper and lower thresholds. the temperature window is shown in figure 1 for a 0c to +50c typical application using a mitsubishi type th11-4h104f thermistor. battery removal detection the ISL9219 assumes that the thermistor is co-packed with the battery and is removed toge ther with the battery. when the charger senses a ts pin voltage that is 2.25v or higher, it assumes that the battery is removed. the battery removal detection circuit is also shown in figure 2. when a battery is removed, the ISL9219 enters the suspend state and the charging is halted. when a batt ery is inserted again, a new charge cycle starts. shutdown and suspend state the ISL9219 can be orderly shutdown by one of these conditions: 1. en pin is pulled to logic hi 2. the battery has been removed from the charger. the battery removal condition can be detected by the ts pin (see ?battery removal detection? on page 9). when shut down, the charger st ays in the suspend state and draws typically less than 300a current from the input power. under an ovp condition, the charger also enters the suspend state. v tmin (1.88v) 0v under temp over temp ts pin voltage v tmin- (1.68v) v tmax (0.16v) v tmax+ (0.18v) figure 1. threshold voltages for 0c to +50c window + - + - ts gnd 2.8v r2 r3 r4 r5 q1 q2 cp2 cp3 under temp over temp ts function to ts pin v tmin v tmax r t + - r1 battery removal cp1 v rmv 5 a figure 2. internal circuit for ntc interface ISL9219
10 all intersil u.s. products are manufactured, asse mbled and tested utilizing iso9000 quality systems. intersil corporation?s quality certifications ca n be viewed at www.intersil.com/design/quality intersil products are sold by description only. intersil corpor ation reserves the right to make changes in circuit design, soft ware and/or specifications at any time without notice. accordingly, the reader is cautioned to verify that data sheets are current before placing orders. information furnishe d by intersil is believed to be accurate and reliable. however, no responsibility is assumed by intersil or its subsidiaries for its use; nor for any infringements of paten ts or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of intersil or its subsidiari es. for information regarding intersil corporation and its products, see www.intersil.com fn6606.2 april 7, 2010 input and output capacitor selection a 0.47f or higher value ceramic capacitor for the input is recommended. due to the induct ance of the power leads of the wall adapter or usb source, the input capacitor type must be properly selected to prevent high voltage transient during a hot-plug event. a tantalum capacitor is a good choice for its high esr, providing damping to the voltage transient. multi-layer cerami c capacitors, however, have a very low esr and hence when chosen as input capacitors, a 1 series resistor is recommended, as shown in the ?typical application? schematic on page 5, to provide adequate damping. when the battery is attached to the charger, the output capacitor can be any ceramic type with the value higher than 0.1f. however, if there is a chance the charger will be used as an ldo linear regulator, a 10f tantalum capacitor is recommended. board layout recommendations the ISL9219 internal thermal foldback function limits the charge current when the internal temperature reaches approximately +125c. in order to maximize the current capability, it is very important that the exposed pad under the package is properly soldered to the board and is connected to other layers through thermal vias. more thermal vias and more copper attached to the exposed pad usually result in better thermal performance. on the other hand, the number of vias is limited by the size of the pad. the exposed pad is big enough for 5 vias. state diagram the state diagram is shown in figure 3. there area total of 5 states during a complete c harging cycle: trickle charge, cc charge, cv charge, charge complete/recharge, fault and suspend. in the trickle mode, the ISL9219 charges the battery in a trickle current. if vout reaches vmin before the trickle charge timeout interval, the operation will move to the cc mode. before entering the cc mode, the input source is identified. the cc mode output current is set according to the input type as described in ?usb compliant current setting? on page 7. when the output voltage reaches the 4.2v final voltage, the operat ion will move cv mode, where the battery is charged at a cons tant voltage. if the end-of- charge current is reached before the timeout interval is elapsed, the operation moves to charge complete state. the charger continues to charge the battery until a timeout condition is reached, then the charging will be terminated. after the termination, if the output voltage drops below the recharge threshold, a recharge starts and the timer is rest to zero. the stat1 and stat2 indi cations, rema ins the same as the charge complete state. in the event that the timeout condition is reached before eoc, the fault mode is entered. the fault mode can also be triggered by an otp event. to exit the fault mode, the input power has to be removed and re-applied, or the en pin is toggled to hi and back to lo, then a new cycle starts. ISL9219
11 fn6606.2 april 7, 2010 power up por y n cv charge stat1= l stat2 = l pg = vin acflt = l y n initialization reset counter vout>v min y i out = i set y n y n por y n i out < i min ? ac_in = hi? usbi = hi? i out = 500ma i out = 100ma n vout = 4.2v? charge complete stat1 = l stat2 = h pg = vin acflt = l y n trickle charge stat1 = l stat2 = l pg = vin acflt = l vin>vpor? anytime when vin < 4.4v acflt = h y timeout ? timeout ? fault stat1 = h stat2 = l charge complete stat1 = l stat2 = h charger off por or en toggled otp n n trickle timeout ? y cv charge stat1= l stat2 = l pg = vin acflt = l timeout? y n vin>vout +vos? y n en = lo ? y n suspend stat1 = h stat2 = h anytime when batt is removed vinISL9219
12 fn6606.2 april 7, 2010 ISL9219 package outline drawing l20.3x4 20 lead quad flat no-lead plastic package rev 1, 3/10 typical recommended land pattern detail "x" top view bottom view side view located within the zone indicated. the pin #1 indentifier may be unless otherwise specified, tolerance : decimal 0.05 tiebar shown (if present) is a non-functional feature. the configuration of the pin #1 id entifier is optional, but must be between 0.15mm and 0.30mm from the terminal tip. dimension applies to the metallized terminal and is measured dimensions in ( ) for reference only. dimensioning and tolerancing conform to amse y14.5m-1994. 6. either a mold or mark feature. 3. 5. 4. 2. dimensions are in millimeters. 1. notes: 0.10 m c a b mc 0.05 0.15 0.08 c 0.10 c a b c c 4.00 3.00 20x 0.400.10 2.65 1.65 0.25 0.50 (2.80) (1.65) +0.10 -0.15 +0.10 -0.15 +0.05 -0.07 20x a a 4 (4x) seating plane 0.9 0.10 5 0.2 ref 0.05 max. see detail "x" 0.00 min. (c 0.40) 1 20 17 16 11 6 10 7 (3.80) (2.65) (20 x 0.25) (20 x 0.60) (16 x 0.50) 16x view "a-a" pin 1 index area pin 1 index area 6 6

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