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general description the max1507 is an intelligent, stand-alone constant-cur- rent, constant-voltage (cccv), thermally regulated linear charger for a single-cell lithium-ion (li+) battery. the max1507 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 max1507 functions as a stand-alone charger to control the charging sequence from the prequalification state through fast-charge, top-off charge, and full- charge indication. proprietary thermal-regulation circuitry limits the die temperature when fast charging or while exposed to high ambient temperatures, allowing maximum charg- ing current without damaging the ic. the max1507 achieves high flexibility by providing an adjustable fast-charge current and thermal regulation setpoints. other features include the charging status ( chg ) of the battery and an active-low control input ( en ). the max1507 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 max1507 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 phones pdas 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, or current-sense resistor required ? programmable fast-charge current (0.8a max) ? proprietary programmable die-temperature regulation control (+90?, +100?, and +130?) ? +4.25v to +13v input voltage range with input overvoltage protection (ovp) above +7v ? charge-current monitor for fuel gauging ? low dropout voltage?30mv at 0.425a ? input power-source detection output (vl) and charge-enable input ( en ) ? soft-start limits inrush current ? charge status output ( chg ) for led or microprocessor interface ? small 3mm x 3mm 8-pin thin dfn package, 0.8mm high max1507 linear li+ battery charger with integrated pass fet and thermal regulation in 3mm x 3mm thin dfn ________________________________________________________________ maxim integrated products 1 temp en iset 1 2 chg batt in gnd vl 3mm x 3mm thin dfn top view 3 4 max1507 8 76 5 pin configuration ordering information max1507 1 f input 4.25v to 13v 2.80k ? in en vl chg 1 f li+ 4.2v batt iset temp gnd 0.47 f off on part temp range pin-package top mark MAX1507ETA -40 c to +85 c8 thin dfn-ep* agw t ypical operating circuit 19-2899; rev 1; 11/03 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.
max1507 linear li+ battery charger with integrated pass fet and thermal regulation in 3mm x 3mm thin dfn 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v in = 5v, v batt = 4.0v, temp = en = chg = unconnected, 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 rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns 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 , temp 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 013v 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 )12 disabled, en = vl 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 4 10 ? 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
max1507 linear li+battery charger with integrated pass fet and thermal regulation in 3mm x 3mm thin dfn _______________________________________________________________________________________ 3 note 1: limits are 100% production tested at t a = +25 c. limits over operating temperature range are guaranteed through correlation using statistical quality control (sqc) methods. electrical characteristics (continued) (v in = 5v, v batt = 4.0v, temp = en = chg = unconnected, 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 51015% temp = vl 130 temp = floating 100 die-temperature-regulation set point temp = gnd 90 c v batt precharge threshold voltage v batt rising 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 logic input low voltage 4.25v < v in < 6.5v 0.52 v en logic input high voltage 4.25v < v in < 6.5v 1.3 v en internal pulldown resistor 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 ? full battery detection current threshold (as a percentage of the fast-charge current) i batt falling 5 10 15 %
max1507 linear li+ battery charger with integrated pass fet and thermal regulation in 3mm x 3mm thin dfn 4 _______________________________________________________________________________________ t ypical operating characteristics (v in = 5v, v batt = 4.0v, temp = en = chg = unconnected, 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 max1507 toc01 input voltage (v) supply current (ma) 0 6 8 2 410 12 i batt = 0 0 0.5 1.0 1.5 2.0 disabled-mode supply current vs. input voltage max1507 toc02 input voltage (v) disabled-mode supply current (ma) 0 en = vl 6 8 4 210 12 200 100 400 300 500 600 0 02 134 charge current vs. battery voltage max1507 toc03 battery voltage (v) charge current (ma) temp = vl 0 200 100 400 300 500 600 150 50 350 250 450 550 068 24 10 12 179 35 11 13 charge current vs. input voltage max1507 toc04 input voltage (v) charge current (ma) temp = vl 0 200 100 400 300 500 600 150 50 350 250 450 550 00 .16 0.08 0.24 0.40 0.36 0.04 0.20 0.12 0.28 0.32 charge current vs. input-voltage headroom max1507 toc05 v in - v batt (v) charge current (ma) v batt = 4.0v 4.186 4.180 4.198 4.192 4.204 4.210 4.189 4.183 4.201 4.195 4.207 -40 10 -15 35 60 85 battery regulation voltage vs. temperature max1507 toc06 temperature ( c) battery regulation voltage (v) 600 540 500 460 400 420 580 560 520 480 440 -40 10 -15 35 60 85 charge current vs. ambient temperature max1507 toc07 ambient temperature ( c) charge current (ma) temp = vl 0 300 700 500 900 200 100 600 400 800 1000 -40 10 -15 35 60 85 charge current vs. ambient temperature (temp = vl) max1507 toc08 ambient temperature ( c) charge current (ma) v batt = 4.0v v batt = 3.6v r iset = 1.87k ?
max1507 linear li+ battery charger with integrated pass fet and thermal regulation in 3mm x 3mm thin dfn _______________________________________________________________________________________ 5 t ypical operating characteristics (continued) (v in = 5v, v batt = 4.0v, temp = en = chg = unconnected, r iset = 2.8k ? to gnd, c in = 1?, c batt = 1?, c vl = 0.47?, t a = +25 c, unless otherwise noted.) 0 200 600 400 800 100 300 700 500 900 1000 -40 10 -15 35 60 85 charge current vs. ambient temperature (temp = open) max1507 toc09 ambient temperature ( c) charge current (ma) v batt = 4.0v v batt = 3.6v r iset = 1.87k ? 0 200 600 400 800 100 300 700 500 900 1000 -40 10 -15 35 60 85 charge current vs. ambient temperature (temp = gnd) max1507 toc10 ambient temperature ( c) charge current (ma) v batt = 4.0v v batt = 3.6v r iset = 1.87k ? pin description 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 of battery charging current. the charging current is set by connecting a resistor from iset to gnd. fast-charge current = 1461v / r iset ? . 5 en logic-level enable input. drive en high to disable charger. pull en low or float for normal operation. en has an internal 200k ? pulldown resistor. 6 temp three-level input pin. connect temp to vl, gnd, or leave floating. sets maximum die temperature for thermal regulation loop. connection to gnd = +90 c, floating = +100 c, vl = +130 c. temp is hi-z during 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 is internally connected to gnd.
max1507 linear li+ battery charger with integrated pass fet and thermal regulation in 3mm x 3mm thin dfn 6 _______________________________________________________________________________________ max1507 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 temp en 200k ? gnd in +90 c +100 c +130 c batt chg in detailed description the max1507 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 max1507 charger enters the prequalification stage where it precharges that cell with 10% of the user-programmed fast-charge current. 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 approach- es 4.2v, the charging current is reduced. if the battery current drops to less than 10% of the fast-charging cur- rent, the chg indicator goes high impedance, signal- ing the battery is fully charged. at this point the max1507 enters a constant voltage-regulation mode to figure 1. functional diagram
max1507 linear li+battery charger with integrated pass fet and thermal regulation in 3mm x 3mm thin dfn _______________________________________________________________________________________ 7 maintain the battery at full charge. if, at any point while charging the battery, the die temperature approaches the user-selected temperature setting (temp pin), the max1507 reduces the charging current so the die tem- perature does not exceed the temperature-regulation set point. the thermal-regulation loop limits the max1507 die temperature to the value selected by the temp input by reducing the charge current as necessary (see the thermal-regulation selection section). this feature not only protects the max1507 from overheating, but also allows higher charge current without risking damage to the system. 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. vl internal voltage regulator the max1507 linear charger contains an internal linear regulator 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. shutdown charger = off led = off precharge 10% charge current led = on f ast 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
max1507 linear li+ battery charger with integrated pass fet and thermal regulation in 3mm x 3mm thin dfn 8 _______________________________________________________________________________________ en v in v batt i batt chg state xv batt v in 0 hi-z shutdown low 4.25v v in 7v < 2.5v 10% of i fast low prequalification low 4.25v v in 7v 2.5v i fast * low fast charge low 4.25v v in 7v 4.2v 10% of i fast hi-z full charge low >7v x 0 hi-z overvoltage high x x 0 hi-z disabled x = don? care. * i fast is reduced as necessary to maintain the die temperature set by the temp input. table 1. chg states 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 max1507 is used in 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 entering fast-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. applications information charge-current selection the maximum charging current is programmed by an external 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 selected fast-charge current, and falls with charging current as the cell becomes fully charged. thermal-regulation selection set the regulated die temperature of the max1507 with the temp three-level logic input. the max1507 reduces the charge current to limit the die temperature to the value set by temp. the max1507 operates nor- mally while the thermal loop is active. an active thermal loop does not indicate a fault condition. temp allows the max1507 to maximize the charge current while pro- viding protection against excessive power dissipation. connect temp to gnd to regulate the die temperature at +90?. leave temp floating to regulate the die tem- perature at +100?. connect temp to vl to regulate the die temperature at +130?. capacitor selection connect a ceramic capacitor from batt to gnd for proper stability. use a 1? 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 max1507 is in a thermally enhanced thin dfn package with exposed paddle. connect the exposed paddle of the max1507 to a large copper ground plane to provide a thermal contact between the device and the circuit board. the exposed paddle transfers heat away from the device, allowing the max1507 to charge the battery with maximum current, while minimizing the increase in die temperature. dc input sources the max1507 operates from well-regulated dc sources. 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 max1507 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.
max1507 linear li+battery charger with integrated pass fet and thermal regulation in 3mm x 3mm thin dfn _______________________________________________________________________________________ 9 application circuits stand-alone li+ charger the max1507 provides a complete li+ charging solu- tion. the typical application circuit on the front page shows the max1507 as a stand-alone li+ battery charger. the 2.8k ? resistor connected to iset sets a charging current of 520ma. the led indicates when either fast-charge or precharge qualification has begun. when the battery is full, the led turns off. microprocessor-interfaced charger figure 3 shows the max1507 as a ?-cooperated li+ battery charger. the max1507 starts charging the bat- tery when en is low. the ? can drive en high to dis- able the charger. use a logic-biased npn transistor as an inverter circuit to generate an ac_on signal for the system to detect the presence of an input supply. chg can be used to detect the charge status of a battery. by monitoring v iset , the system can measure the charge current. usb-powered li+ charger the universal serial bus (usb) provides a high-speed serial communication port as well as power for the remote device. the max1507 can be configured to charge its battery at the highest current possible from the host port. figure 4 shows the max1507 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. max1507 1 f 2.8k ? in chg 1 f 4.2v li+ batt en gnd system temp vl iset ac/dc adapter vi/o rohm dtc114em vi/o ac_on charge-current monitor low: charge, high: full or off 0.47 f figure 3. ? interfaced li+ battery charger
max1507 layout and bypassing connect a 1? ceramic input capacitor as close to the device 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: 1812 process: bicmos linear li+ battery charger with integrated pass fet and thermal regulation in 3mm x 3mm thin dfn 10 ______________________________________________________________________________________ max1507 1 f 15.4k ? 4.3k ? in chg 1 f 4.2v li+ batt en n gnd system temp vl iset usb port vbus gnd d+ d- vi/o rohm dtc114em vi/o high: 435ma, low: 95ma 0.47 f figure 4. usb battery charger
max1507 linear li+battery charger with integrated pass fet and thermal regulation in 3mm x 3mm thin dfn ______________________________________________________________________________________ 11 pa cka ge 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 number of leads shown are for reference only e2 detail a n f 1 2 21-0137 package outline, 6, 8, 10 & 14l, tdfn, exposed pad, 3x3x0.80 mm
max1507 linear li+ battery charger with integrated pass fet and thermal regulation in 3mm x 3mm thin dfn maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2003 maxim integrated products printed usa is a registered trademark of maxim integrated products. 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. a0.700 .80 d2.903 .10 e2.903 .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 f 2 2 21-0137 package outline, 6, 8, 10 & 14l, tdfn, exposed pad, 3x3x0.80 mm 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 0.200.03 - - - - 0.40 bsc 1.700.10 2.300.10 14 t1433-1 1.500.10 1.500.10 mo229 / weec mo229 / weed-3 0.40 bsc - - - - 0.200.03 2.40 ref t1433-2 14 2.300.10 1.700.10

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