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general description the max1508 is an intelligent, stand-alone constant-cur- rent, constant-voltage (cccv), thermally regulated linear charger for a single-cell lithium-ion (li+) battery. the max1508 integrates the current-sense circuit, mos pass element, and thermal-regulation circuitry, and also elimi- nates the reverse-blocking schottky diode, to create the simplest and smallest charging solution for hand-held equipment. the max1508 functions as a stand-alone charger to con- trol the charging sequence from the prequalification state through fast-charge, top-off charge, and full-charge indi- cation. the max1508y and max1508z eliminate the pre- qualification state to allow startup into a load without a battery. proprietary thermal-regulation circuitry limits the die temperature to +100? when fast charging or while exposed to high ambient temperatures, allowing maxi- mum charging current without damaging the ic. the max1508 achieves high flexibility by providing an adjustable fast-charge current by an external resistor. other features include the charging status ( chg ) of the battery, an active-low control input ( en ) for the max1508 and max1508z (active-high control input forthe max1508y), and an active-low input power-source detection output ( acok ). the max1508 accepts a +4.25v to +13v supply, but dis-ables charging when the input voltage exceeds +7v to protect against unqualified or faulty ac adapters. the max1508 operates over the extended temperature range (-40? to +85?) and is available in a compact 8-pin thermally enhanced 3mm x 3mm thin dfn pack- age with 0.8mm height. applications cellular and cordless phonespdas digital cameras and mp3 players usb appliances charging cradles and docks bluetooth equipment features ? stand-alone linear 1-cell li+ battery charger ? no external fet, reverse-blocking diode, orcurrent-sense resistor required ? programmable fast-charge current (0.8a max) ? proprietary die-temperature regulation control(+100?) ? +4.25v to +13v input voltage range with inputovervoltage protection (ovp) above +7v ? charge-current monitor for fuel gauging ? low dropout voltage?30mv at 0.425a ? input power-source detection output ( acok ) ? soft-start limits inrush current ? no prequalification state for the max1508y andmax1508z ? charge status output ( chg ) for led or microprocessor interface ? small 3mm x 3mm 8-pin thin dfn package,0.8mm high ? active-low charge enable ( en ) (max1508 and max1508z) ? active-high charge enable (en) (max1508y) max1508/max1508y/max1508z linear li+ battery charger with integrated pass fet, thermal regulation, and acok in 3mm x 3mm tdfn ________________________________________________________________ maxim integrated products 1 acok en (en) iset 1 2 chg batt in gnd vl 3mm x 3mm thin dfn top view 3 4 max1508 max1508y max1508z 8 76 5 ( ) are for the max1508y only + pin configuration ordering information part temp range pin-package top mark max1508eta-t -40 c to +85 c8 thin dfn-ep* ahf max1508eta+t -40 c to +85 c8 thin dfn-ep* ahf 19-2890; rev 2; 8/05 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. evaluation kit available bluetooth is a trademark of ericsson. * ep = exposed paddle. + denotes lead-free package. ordering information continued at end of data sheet. typical operating circuit appears at end of data sheet. downloaded from: http:///
max1508/max1508y/max1508z linear li+ battery charger with integrated pass fet, thermal regulation, and acok in 3mm x 3mm tdfn 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics(v in = 5v, v batt = 4.0v, acok = en = chg = unconnected (for the max1508 and max1508z), en = vl (for the max1508y), r iset = 2.8k ? to gnd, c vl = 0.47?, batt bypassed to gnd with 1?, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. in, chg to gnd .....................................................-0.3v to +14v vl, batt, iset, en , en, acok to gnd ..................-0.3v to +6v vl to in...................................................................-14v to +0.3v in to batt continuous current.............................................0.9a continuous power dissipation (t a = +70?) 8-pin tdfn (derate 24.4mw/? above +70?) .........1951mw short-circuit duration.................................................continuous operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter conditions min typ max units input voltage range 01 3 v input operating range 4.25 6.50 v v in - v batt , v in rising 20 40 60 acok trip point, in v in - v batt , v in falling 15 30 45 mv v in rising 6.5 7 7.5 overvoltage lockout trip point v in hysteresis 0.11 v charging (i in - i batt )1 2 disabled, en = vl (max1508/max1508z), en = gnd (max1508y) 0.8 1.5 in input current off state (v in = v batt = 4.0v) 0.065 ma vl output voltage i vl = 100? 3.3 v vl load regulation i vl = 100? to 2ma -71 -200 mv vl temperature coefficient i vl = 100? -2 mv/? v in rising 2.95 vl undervoltage lockout trip point hysteresis 0.17 v v in = 0 to 4v 3 10 batt input current en = vl (max1508/max1508z), en = gnd (max1508y) 41 0 ? maximum rms charge current 0.8 a t a = 0? to +85? 4.162 4.2 4.238 battery regulation voltage i batt = 0 t a = -40? to +85? 4.150 4.2 4.250 v batt removal detection threshold v batt rising 4.4 4.67 4.9 v downloaded from: http:///
max1508/max1508y/max1508z linear li+ battery charger with integrated pass fet, thermal regulation, and acok in 3mm x 3mm tdfn _______________________________________________________________________________________ 3 note 1: limits are 100% production tested at t a = +25 c. limits over operating temperature range are guaranteed through correla- tion using statistical quality control (sqc) methods. electrical characteristics (continued)(v in = 5v, v batt = 4.0v, acok = en = chg = unconnected (for the max1508 and max1508z), en = vl (for the max1508y,) r iset = 2.8k ? to gnd, c vl = 0.47?, batt bypassed to gnd with 1?, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter conditions min typ max units batt removal detection-threshold hysteresis 200 mv minimum batt bypass capacitance 1 ?/a fast-charge current-loop system accuracy v batt = 3.5v 478 520 562 ma precharge current system accuracy percentage of the fast-charge current,v batt = 2.2v (max1508 only) 51 01 5% die-temperature-regulation set point 100 c v batt precharge threshold voltage v batt rising (max1508 only) 2.3 2.5 2.7 v current-sense amplifier gain, i set to i batt in fast-charge mode i batt = 500ma, v iset = 1.4v 0.880 0.958 1.035 ma/a regulator dropout voltage (v in - v batt )v batt = 4.1v, i batt = 425ma 130 200 mv en or en logic input low voltage 4.25v < v in < 6.5v 0.52 v en or en logic input high voltage 4.25v < v in < 6.5v 1.3 v en or en internal pulldown resistor (max1508 and max1508z only) 100 200 400 k ? chg output low current v chg = 1v 5 12 20 ma t a = +25? 1 chg output high leakage current v chg = 13v t a = +85? 0.002 ? acok output low voltage i acok = 0.5ma 0.4 v t a = +25? 1 acok output high leakage current v acok = 5.5v t a = +85? 0.002 ? full-battery detection current threshold(as a percentage of the fast-charge current) i batt falling 5 10 15 % downloaded from: http:///
max1508/max1508y/max1508z linear li+ battery charger with integrated pass fet, thermal regulation, and acok in 3mm x 3mm tdfn 4 _______________________________________________________________________________________ t ypical operating characteristics (v in = 5v, v batt = 4.0v, acok = en = chg = unconnected, en = vl (max1508y), r iset = 2.8k ? to gnd, c in = 1?, c batt = 1?, c vl = 0.47?, t a = +25 c, unless otherwise noted.) 0 0.5 1.0 1.5 2.0 supply current vs. input voltage max1508 toc01 input voltage (v) supply current (ma) 0 6 8 2 41 0 12 i batt = 0 0 0.5 1.0 1.5 2.0 disabled-mode supply current vs. input voltage max1508 toc02 input voltage (v) disabled-mode supply current (ma) 0 6 8 4 21 0 12 en = vl (max1508/1508z)en = gnd (max1508y) 0 200100 400300 500 600 01 234 charge current vs. battery voltage max1508 toc03 battery voltage (v) charge current (ma) 0 50 250150 450350 550200 100 400300 500 600 06 8 24 10 12 17 9 35 11 13 charge current vs. input voltage max1508 toc04 input voltage (v) charge current (ma) 0 200100 400300 500 50 250150 450350 550 600 00 . 1 6 0.08 0.24 0.40 0.04 0.20 0.12 0.28 0.32 0.36 charge current vs. input-voltage headroom max1508 toc05 v in - v batt (v) charge current (ma) 4.180 4.186 4.1984.192 4.2044.189 4.183 4.2014.195 4.207 4.210 -40 10 -15 35 60 85 battery regulation voltage vs. temperature max1508 toc06 temperature ( c) battery regulation voltage (v) 600560 520 460 420 580540 480 500440 -40 10 -15 35 60 85 charge current vs. ambient temperature max1508 toc07 ambient temperature ( c) charge current (ma) 0 200 600400 800100 300 700500 900 1000 -40 10 -15 35 60 85 charge current vs. ambient temperature max1508 toc09 ambient temperature ( c) charge current (ma) v batt = 4.0v v batt = 3.6v r iset = 1.87k ? downloaded from: http:///
max1508/max1508y/max1508z linear li+ battery charger with integrated pass fet, thermal regulation, and acok in 3mm x 3mm tdfn _______________________________________________________________________________________ 5 detailed description the max1508 charger uses voltage, current, and ther- mal-control loops to charge a single li+ cell and to pro- tect the battery (figure 1). when a li+ battery with a cell voltage below 2.5v is inserted, the max1508 charger enters the prequalification stage where it precharges that cell with 10% of the user-programmed fast-charge cur- rent. there is no prequalification stage for the max1508z and max1508y in order to allow startup into a load with- out a battery. the chg indicator output is driven low (figure 2) to indicate entry into the prequalification state.once the cell has passed 2.5v, the charger soft-starts before it enters the fast-charge stage. the fast-charge current level is programmed through a resistor from iset to ground. as the battery voltage approaches 4.2v, the charging current is reduced. if the battery current drops to less than 10% of the fast-charging current, the chg indicator goes high impedance, signaling the battery is fully charged. at this point the max1508 enters a con- stant voltage-regulation mode to maintain the battery at full charge. if, at any point while charging the battery, the die temperature approaches +100?, the max1508 reduces the charging current so the die temperature does not exceed the temperature-regulation set point. the thermal-regulation loop limits the max1508 die temperature to +100? by reducing the charge current as necessary (see the thermal regulation section). this feature not only protects the max1508 from over-heating, but also allows higher charge current without risking damage to the system. max1508/max1508z en charger enable input en is a logic input (active low) to enable the charger. drive en low, leave floating, or connect to gnd to enable the charger control circuitry. drive en high to disable the charger control circuitry. en has a 200k ? internal pulldown resistance. max1508y en charger enable input en is a logic input (active high) to enable the charger.drive en high to enable the charger control circuitry. drive en low to disable the charger control circuitry. acok output active-low output. the open-drain acok output asserts low when +4.25v < v in < +7v and v in - v batt > 40mv. acok requires an external 100k ? pullup resistor to the system? logic i/o voltage. acok is high impedance in shutdown. vl internal voltage regulator the max1508 linear charger contains an internal linearregulator available on the vl output pin. vl requires a 0.47? ceramic bypass capacitor to gnd. vl is regulat- ed to 3.3v whenever the input voltage is above 3.5v. pin name function 1v li nternally generated logic supply for chip. bypass vl to gnd with a 0.47? capacitor. 2i n input supply voltage. bypass in to gnd with a 1? capacitor to improve line noise and transient rejection. 3 gnd ground. connect gnd and exposed pad to a large copper trace for maximum power dissipation. 4 iset charge-current program and fast-charge current monitor. output current from iset is 0.958ma per amp ofbattery charging current. the charging current is set by connecting a resistor from iset to gnd. fast-charge current = 1461v / r iset . en logic-level enable input (max1508/1508z). drive en high to disable charger. pull en low or float for normal operation. en has an internal 200k pulldown resistor. 5 en logic-level enable input (max1508y). drive en low to disable charger. drive en high for normal operation. 6 acok input power-detection output. the open-drain acok output asserts low when +4.25v < v in < +7v and v in - v batt > 40mv. acok requires an external 100k pullup resistor. acok is high impedance in shutdown. 7 batt li+ battery connection. bypass batt to gnd with a capacitor of at least 1? per ampere of charge current. 8 chg charging indicator, open-drain output. chg goes low (and can turn on an led) when charging begins. chg is high impedance when the battery current drops below 10% of the fast-charging current, or when en is high. connect a pullup resistor to the ?? i/o voltage when interfacing with a ? logic input. pad exposed pad. connect exposed pad to a large copper trace for maximum power dissipation. the pad isinternally connected to gnd. pin description downloaded from: http:///
max1508/max1508y/max1508z linear li+ battery charger with integrated pass fet, thermal regulation, and acok in 3mm x 3mm tdfn 6 _______________________________________________________________________________________ max1508 output driver, current sense, and logic v luvlo v inovlo in on inok refok v lok refok ref vl n logic temperature sensor v ref iref in iset vl 0.47 f batt en (en) 200k ? gnd in 100 c batt chg in n acok vi/o max1508 and max1508z only ( ) are for max1508y only chg charge indicator output chg is an open-drain current source for indicating charge status. table 1 describes the state of chg dur- ing different stages of operation.chg is a nominal 12ma current source suitable for dri- ving a charge-indication led. if the max1508 is usedin conjunction with a microprocessor, a pullup resistor to the logic i/o voltage allows chg to indicate charge status to the ? instead of driving an led. soft-start an analog soft-start algorithm activates when enteringfast-charge mode. when the prequalification state is complete (v batt exceeds +2.5v), the charging current ramps up in 3ms to the full charging current. this reduces the inrush current on the input supply. since the max1508y and max1508z do not have a prequali- fication state, they automatically enter soft-start upon activation. figure 1. functional diagram downloaded from: http:///
max1508/max1508y/max1508z linear li+ battery charger with integrated pass fet, thermal regulation, and acok in 3mm x 3mm tdfn _______________________________________________________________________________________ 7 applications information charge-current selection the maximum charging current is programmed by anexternal r iset resistor connected from iset to gnd. select the r iset value based on the following formula: i fast = 1461v / r iset ? where i fast is in amps and r iset is in ohms. iset can also be used to monitor the fast-charge current level.the output current from the iset pin is 0.958ma per amp of charging current. the output voltage at iset is proportional to the charging current as follows: v iset = (i chg x r iset ) / 1044 the voltage at iset is nominally 1.4v at the selectedfast-charge current, and falls with charging current as the cell becomes fully charged. thermal regulation the max1508 features a proprietary thermal-regulationcircuit to protect both the ic and the system from excessive heat. when the max1508? die temperature reaches +100?, the charge current is reduced to pre- vent any additional increase in the die temperature. an active thermal loop does not indicate a fault condition. thermal regulation allows the max1508 to provide con- tinuous charge to the battery under adverse conditions without causing excessive power dissipation. shutdown charger = off led = off precharge 10% charge current led = on (max1508 only) fast charge 100% charger current led = on full batt continues to regulate batt up to 4.2v i charge < 10% of iset v batt > 2.5v v batt < 2.4v v batt < 2.5v v in < 7v and v in > v batt and en = low v in > 7v + v batt > v in + en = high asynchronous from anywhere v in > 7v + v batt > vin + en = high i charge > 20% of iset full batt led = off figure 2. charge state diagram downloaded from: http:///
max1508/max1508y/max1508z linear li+ battery charger with integrated pass fet, thermal regulation, and acok in 3mm x 3mm tdfn 8 _______________________________________________________________________________________ en (max1508/max1508z) en (max1508y) v in v batt i batt chg state xx v batt v in 0 hi-z shutdown low high 4.25v v in 7v < 2.5v 10% of i fast low prequalification low high 4.25v v in 7v 2.5v i fast * low fast charge low high 4.25v v in 7v 4.2v 10% of i fast hi-z full charge low high >7v x 0 hi-z overvoltage high low x x 0 hi-z disabled x = don? care. * i fast is reduced as necessary to maintain the die temperature at +100?. table 1. chg states capacitor selection connect a ceramic capacitor from batt to gnd for proper stability. use a 1f x5r ceramic capacitor for most applications. connect a 1? ceramic capacitor from in to gnd. use a larger input bypass capacitor for high input voltages or high charging currents to reduce supply noise. connect a 0.47? ceramic capacitor from vl to gnd. thermal considerations the max1508 is in a thermally enhanced thin dfn pack- age with exposed paddle. connect the exposed paddle of the max1508 to a large copper ground plane to pro- vide a thermal contact between the device and the circuit board. the exposed paddle transfers heat away from the device, allowing the max1508 to charge the battery with maximum current, while minimizing the increase in die temperature. dc input sources the max1508 operates from well-regulated dcsources. the full-charging input voltage range is 4.25v to 7v. the device can stand up to 13v on the input without damage to the ic. if v in is greater than 7v, then the max1508 stops charging.an appropriate power supply must provide at least 4.25v when sourcing the desired peak charging cur- rent. it also must stay below 6.5v when unloaded. application circuits stand-alone li+ charger the max1508 provides a complete li+ charging solu-tion. the typical operating circuit at the end of the data sheet shows the max1508 as a stand-alone li+battery charger. the 2.8k ? resistor connected to iset sets a charging current of 520ma. the led indicateswhen either fast-charge or precharge qualification has begun. when the battery is full, the led turns off. microprocessor-interfaced charger figure 3 shows the max1508 as a ?-cooperated li+battery charger. the max1508 and max1508z start charging the battery when en is low. the ? can drive en high to disable the charger (max1508 and max1508z). the max1508? acok output indicates the presence of a valid ac adapter to the ?. chg can be used to detect the charge status of a battery. bymonitoring v iset , the system can measure the charge current. usb-powered li+ charger the universal serial bus (usb) provides a high-speedserial communication port as well as power for the remote device. the max1508 can be configured to charge its battery at the highest current possible from the host port. figure 4 shows the max1508 as a usb battery charger. to make the circuit compatible with either 100ma or 500ma usb ports, the circuit initializes at 95ma charging current. the microprocessor then interrogates the host to determine its current capability. if the host port is capable, the charging current is increased to 435ma. the 435ma current was chosen to avoid exceeding the 500ma usb specification. layout and bypassing connect a 1? ceramic input capacitor as close to thedevice as possible. provide a large copper gnd plane to allow the exposed paddle to sink heat away from the device. connect the battery to batt as close to the device as possible to provide accurate battery voltage sensing. make all high-current traces short and wide to minimize voltage drops. for an example layout, refer to the max1507/max1508 evaluation kit layout. chip information transistor count: 1812process: bicmos downloaded from: http:///
max1508/max1508y/max1508z linear li+ battery charger with integrated pass fet, thermal regulation, and acok in 3mm x 3mm tdfn _______________________________________________________________________________________ 9 max1508 max1508y max1508z 1 f 2.8k ? inchg 1 f 4.2v li+ batt en (en) gnd system vl iset ac/dc adapter vi/o vi/o charge-current monitor low: charge, high: full or off acok 0.47 f ( ) are for the max1508y only figure 3. ?-interfaced li+ battery charger max1508 max1508y max1508z 1 f 15.4k ? 4.3k ? inchg 1 f 4.2v li+ batt en (en) n gnd system vl acok iset usb port vbus gnd d+ d- vi/o vi/o high: 435ma, low: 95ma 0.47 f ( ) are for the max1508y only figure 4. usb battery charger downloaded from: http:///
package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .) 6, 8, &10l, dfn thin.eps l c l c pin 1 index area d e l e l a e e2 n g 1 2 21-0137 package outline, 6,8,10 & 14l,tdfn, exposed pad, 3x3x0.80 mm -drawing not to scale- k e [(n/2)-1] x e ref. pin 1 id 0.35x0.35 detail a b d2 a2 a1 max1508/max1508y/max1508z linear li+ battery charger with integrated pass fet, thermal regulation, and acok in 3mm x 3mm tdfn 10 ______________________________________________________________________________________ max1508 max1508y max1508z 1 f input4.25v to 13v 2.80k ? in en (en) vl chg 1 f li+4.2v batt iset gnd 0.47 f off on acok ( ) are for the max1508y only t ypical operating circuit ordering information (continued) part temp range pin-package top mark MAX1508YETA-t -40 c to +85 c8 thin dfn-ep* ail MAX1508YETA+t -40 c to +85 c8 thin dfn-ep* ail max1508zeta-t -40 c to +85 c8 thin dfn-ep* aik max1508zeta+t -40 c to +85 c8 thin dfn-ep* aik * ep = exposed paddle. + denotes lead-free package. downloaded from: http:///
max1508/max1508y/max1508z linear li+ battery charger with integrated pass fet, thermal regulation, and acok in 3mm x 3mm tdfn maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 11 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .) common dimensions symbol min. max. a 0.70 0.80 d 2.90 3.10 e 2.90 3.10 a1 0.00 0.05 l 0.20 0.40 pkg. code n d2 e2 e jedec spec b [(n/2)-1] x e package variations 0.25 min. k a2 0.20 ref. 2.300.10 1.500.10 6 t633-1 0.95 bsc mo229 / weea 1.90 ref 0.400.05 1.95 ref 0.300.05 0.65 bsc 2.300.10 8 t833-1 2.00 ref 0.250.05 0.50 bsc 2.300.10 10 t1033-1 2.40 ref 0.200.05 - - - - 0.40 bsc 1.700.10 2.300.10 14 t1433-1 1.500.101.500.10 mo229 / weec mo229 / weed-3 0.40 bsc - - - - 0.200.05 2.40 ref t1433-2 14 2.300.10 1.700.10 t633-2 6 1.500.10 2.300.10 0.95 bsc mo229 / weea 0.400.05 1.90 ref t833-2 8 1.500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 ref t833-3 8 1.500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 ref -drawing not to scale- g 2 2 21-0137 package outline, 6,8,10 & 14l,tdfn, exposed pad, 3x3x0.80 mm downbonds allowed nono no no yes no yes no downloaded from: http:///

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