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lx2206 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 2007 rev. 1.3a, 2007-08-28 www. microsemi . com dual level lithium ion battery charger tm ? description the lx2206 can be used with a wall adapter or usb power source to charge a single cell lithium ion or lithium polymer battery. there are two logic selectable and program- mable charge current levels which can be set from anywhere between 50ma to 1a. the termination current is 1/10 the charge level set by the high level programming current pin. power status indi cators (stat and dcok) can be configured to show charge in progress, battery fully charged and external power on. the stat pin is capable of sourcing or sinking 10ma. the dcok output is an open drain output. the lx2206 enters a low quiescent current sleep mode when power is removed or when it is logically shutdown to minimize battery drain. there are several protection features which include: under voltage lock out, inrush current limiti ng, reverse current blocking on the in pin, a thermal loop to reduce charge current to maintain a low die temperature, an unsafe battery temperature charge inhibitor, and conditioning mode is provided for deeply discharged batteries. important: for the most current data, consult microsemi ?s website: http://www.microsemi.com key features ? two independent programmable charge currents ? 0.5% float voltage tolerance ? charging up to 1a. ? charging from usb port. ? usb current compliance ? full battery indicator ? cc/cv w thermal feedback ? battery temperature monitor ? precision charge termination ? power good indication applications ? mp3 player ? pda ? pmc ? digital camera ? charge cradle product highlight dcok adapter or usb shutdown high/low charge current current programming control logic status battery temperature lockout sensing lx2206 in bat sd h/l hcp tmp dcok stat gnd cmp charging full power on battery lcp package order info ld plastic mlpd 10-pin t a ( c) rohs compliant / pb-free -40 to 85 lx2206ild note: available in tape & reel. append the lett ers ?tr? to the part num ber. (i.e. LX2206ILD-TR) l l x x 2 2 2 2 0 0 6 6
lx2206 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 2 copyright ? 2007 rev. 1.3a, 2007-08-28 www. microsemi . com dual level lithium ion battery charger tm ? absolute maximum ratings supply input voltage (in , bat) ...................................................................... -0.3 v to 7v all other pins ............................................................................................-0.3v to v supply battery charging current .............................................................................................1.1a operating temperatur e range .........................................................................- 40 to 150 c maximum operating junc tion temper ature .............................................................. 150 c storage temperat ure rang e.........................................................................-65 c to 150 c lead temperature (sol dering 10 s econds) ................................................................. 300 c package peak temp. for solder reflow (40 seconds maximum exposure) ... 260c (+0 -5) note: exceeding these ratings could cause damage to the device. all voltages are with respect to ground. currents are positive into, negative out of specified terminal . thermal data ld plastic micro leadframe package 10-pin thermal resistance - junction to a mbient , ja 33 c/w junction temperature calculation: t j = t a + (p d x ja ). the ja numbers are guidelines for the thermal performan ce of the device/pc-board system. all of the above assume no ambient airflow. package pin out in 1 2 3 4 56 7 8 9 10 c onnect bottom pad to gnd stat dcok sd h/l lcp hcp tmp bat cmp ld p ackage p inout (top view) rohs / pb-free 100% matte tin pin finish 2206 xxxx msc part marking xxxx = denotes date and lot code identification ` functional pin description name description bat battery ? connect to a si ngle cell lithium ion battery. cmp compensation ? connect the series combination of a 1k resistor and a 0.47f capacitor from cmp to in. dcok power status logic pin and led driver ? this pin is an open drain output that can sink 20ma of current to drive an external led. this pin is low impedance to gnd when the input voltage is high enough to charge the battery. gnd ground ? connect to the system ground plane. use suffi cient via copper area to allow for thermal conduction from the ic to the gnd plane. hcp high current programming (and termination current progr amming) ? connect a resistor to ground to set the constant current high level. the termination current is set to 1/10 of the high current programming level. for a value of 19.6k, the high current is 460ma and the termination current is 46ma. h/l high or low load select logic input ? a logic high select s the constant charge current level set by the hcp pin resistor and a logic low selects the constant charge current leve l set by the lcp pin resistor in input power ? connect to a wall adapter or a usb power plug. lcp low current programming ? connect a resistor to gr ound to set the constant current low level. for a value of 110k, the low current is 92ma. sd shutdown ? a logic high places the lx2206 in sleep mode; can also be used for usb suspend. stat charging status logic pin and led driver ? this pin can s ource or sink 10ma of current to drive an external led in either output state. this pin is low (current sinkin g mode) when the battery is in charging mode and becomes high (current sourcing mode) when the charge cycle is finished. it becomes a high impedance when the input power is removed. tmp battery temperature monitor ? this sense pin dete rmines the battery temperature for charging out of temperature range lockout and is connect ed to a resistor network as defined in the applications section. the tmp pin is grounded if this function is not used. p p a a c c k k a a g g e e d d a a t t a a
lx2206 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 3 copyright ? 2007 rev. 1.3a, 2007-08-28 www. microsemi . com dual level lithium ion battery charger tm ? -- electrical characteristics unless otherwise specified, the following specifications apply over the operating ambient temperature -40 c c except where otherwise noted and the following test conditions:. in = 5. 0v; sd = low; h/l = high; bat = 3.6v; h cp =19.6k, lcp=110k; tmp = 0v. lx2206 parameter symbol test conditions min typ max units ` input circuitry input voltage vin 4.35 6 v battery voltage v bat 4.3 v under voltage charging lockout vin uvlo rising input v bat = 3.2v 3.5 3.8 4 v uvlo hysteresis 300 mv v bat = 4.2v; battery charged 1 2 ma input supply current iin shdn = high 35 50 a ` battery charger constant voltage charging v cvl i bat < 100ma 4.16 4.2 4.24 v constant voltage charging v cvl i bat < 100ma @ 25c 4.18 4.2 4.22 v hcp bias voltage v hcp i bat > 100ma 1.25 v lcp bias voltage v lcp 1.25 v hcp = 12.1k 650 710 750 ma 420 460 483 ma battery charge current i bat h/l = low 87 92 97 ma conditioning current i cond v bat < vcct; hcp = 19.6k 13 23 33 ma conditioning current i cond v bat < vcct; hcp = 110k 2.6 5.0 7.5 ma cond. current threshold v cct 2.5 2.7 2.9 v charge termination current i bat hcp = 19.6k 34 46 59 ma charge termination current i bat hcp = 110k 9 ma charge termination current i bat hcp = 210k 5 ma top off threshold v tot 96 97 98 bat cvl v % v v bat = 4.2v; battery charged 1 30 a v bat > v in 5 30 a battery drain current i bat sd = high (shutdown mode) 1 5 a ` logic stat logic high output v drv v in = 5.0v, i drv = -10ma 4.2 4.5 5 v stat logic low output v drv v in = 5.0v, i drv = 10ma 0.5 v logic hi, 1.2 input logic : sd, h/l v log(in) logic lo 0.4 v logic hi, v log = 2v 0 2 4 input current : sd, h/l i log(in) logic lo, v log = 0v -2 0 2 a logic hi, i log = 10k pullup to 3.3v 3.1 output logic : dcok v log(out) logic lo, i log = 20ma 0.5 v ` battery temperature monitor rising threshold 0.75 x vin v cold temp fault threshold vcold falling threshold 0.72 x vin v falling threshold 0.28 x vin v hot temp fault threshold vhot rising threshold 0.30 x vin v tfb disable voltage vdis 75 100 150 mv e e l l e e c c t t r r i i c c a a l l s s
lx2206 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 4 copyright ? 2007 rev. 1.3a, 2007-08-28 www. microsemi . com dual level lithium ion battery charger tm ? simplified block diagram in bat charge control gnd high charging current hcp temperature control constant voltage control charge termination control enable sd uvlo + - stat low charging current lcp h/l dcok tmp cond. current conditioning threshold b b l l o o c c k k d d i i a a g g r r a a m m
lx2206 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 5 copyright ? 2007 rev. 1.3a, 2007-08-28 www. microsemi . com dual level lithium ion battery charger tm ? control logic diagram start v in > v bat yes sleep no v bat >60% condition charge mode no yes constant current charge mode temp < 130 reduce charge current i cc < i max yes reduce charge current yes no no v bat > v cv constant voltage charge mode yes no i bat vbat, uvlo, sd, change state. return to the top of the chart. i max determined by the state of h/l, r hcp , r lcp . uvlo yes no sd yes no i taper determined by r hcp . a a p p p p l l i i c c a a t t i i o o n n s s
lx2206 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 6 copyright ? 2007 rev. 1.3a, 2007-08-28 www. microsemi . com dual level lithium ion battery charger tm ? application circuits figure 1 ? typical application ? 1a or 500ma maximum charge currents with three indicators and battery temperature lockout. a grounded spare pin in the usb power cable can be used to sense when the 500ma usb current power source is being used. suspend current programming control logic charging lx2206 in bat sd h/l hcp tmp dcok stat gnd cmp battery lcp 2.5k 19.6k 110k 10k dcok v cc 1k 0.47uf usb 15k usb high/low figure 2? typical usb application ? 500ma or 100ma maximum charge currents with charge indicator. adapter shutdown charging in bat sd h/l hcp tmp dcok stat gnd cmp battery lcp 2.5k 17.8k 63.4k 10k dcok v cc lx2206 1k 0.47uf 15k figure 3 ? typical low current application ? 150ma charge current and 50ma termination current. a a p p p p l l i i c c a a t t i i o o n n s s
lx2206 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 7 copyright ? 2007 rev. 1.3a, 2007-08-28 www. microsemi . com dual level lithium ion battery charger tm ? theory of operation g eneral d escription the lx2206 is designed to charge a single cell lithium ion battery using two steps: a constant current mode followed by a constant voltage mode. the maximum charging current during the constant current mode of the charging profile can be logically set (using h/l) to two preprogrammed levels set by resistors connected to hcp and lcp (high and low curren t). the charger will terminate constant voltage charging once the current drops below the taper current setting which is 10% of the high charge current setting (determined by hcp resistor value). c onditioning c urrent c harge m ode a conditioning current is applied to batteries that are deeply discharged and have a terminal voltage less than 60% of the constant voltage le vel. the conditioning current is 5% of the hcp programmable constant current level. once the battery terminal voltage exceeds the conditioning current threshold, the full constant current level is applied (unless charging current is limited by one of the other charger control loops). c harge t ermination m ode to increase system battery life and avoid float charging, the lx2206 turns off the pass element once the battery has been fully charged. the charge termination state occurs at the end of constant voltage mode. the termination current is set by the value of the resistor connected to the hcp programming pin. the stat pin changes state when charging is completed. t op o ff c harge m ode once the charger has completed a charge cycle, if power remains applied, the lx2206 enters a voltage monitoring mode. in this mode the lx2206 monitors the battery terminal voltage and applies a top off charge if the battery voltage drops below the top of threshold. a dapter or usb s election the lx2206 supports battery char ging from a system that provides adapter power or usb power using the same external connector. figure 1 shows one example of a system using a special usb adapter cable to determine whether the power source is usb or wall adapter. similarly, if the system processor senses the absence of usb data, it can logically set the h/l logic level high to allow a higher charge current to be used. usb c harge m ode and current limit the lx2206 is fully compliant with, and supports, the usb specifications ? the low power peripheral (100ma) and high power peripherals ( 500ma). usb current levels can be set using the appropriate values for the hcp and lcp programming resistors. h/l logic input selects usb high/low charge currents. when the sd pin is pulled high, the usb input enters suspend mode and will not present a load to the in pin. dcok the in input is monitored and dcok is set to a logic low to report the presence of the power source with sufficient voltage to charge the battery. the dcok threshold is the larger of the uvlo threshold or the battery voltage. p rotection f eatures conditioning current mode ? if the battery terminal voltage is less than 2.7v, the battery charger will reduce the charge current to 5%. this al so protects the appliance from overheating by trying to drive the full charging current into a short circuited battery. under voltage lockout ? the charge cycle will not start until the in voltage rises above 3.8v. hysteresis helps alleviate chattering on and off. thermal control loop ? if the power dissipation of the charger becomes excessive, the charge current will be reduced to prevent the die temperature from getting above 140 c. this does not cause the charge cycle to stop. reverse current blocking ? if in input is grounded, current will not flow from the bat pin through the charger. no external blocking diode is required on the input. sleep mode ? if the sd pin is a logic high, the charger enters a sleep mode where a very low quiescent current prevents drain from the battery. a a p p p p l l i i c c a a t t i i o o n n s s
lx2206 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 8 copyright ? 2007 rev. 1.3a, 2007-08-28 www. microsemi . com dual level lithium ion battery charger tm ? application note l ayout in the layout of the printed circuit board (pcb) it is important to provide a solid path from the ic power and ground pins to the power and ground planes of the pcb to provide a good conduction path for heat. this insures the lx2206 stays cool and can provide the maximum charge current to minimize the time required to charge the battery. for stability purposes and to reduce voltage switching transients it is important to place capacitors close to the in and bat pins. a 10f capacitor (x5r or x7r dielectric) is recommended. c urrent p rogramming r esistors the lx2206 has two programming resistors to control the battery charging current during the constant current charging mode of the battery charging cycle. when the h/l pin is high (selecting the high current charging mode), the charge current is determin ed by the value of the hcp programming resistor. the maximum charge current is determined by the programming current at either the hcp or lcp programming pins (depending on the state of h/l); the range of each of these ch annels is identical. the programming current is the hcp or lcp pin voltage (typically 1.25v) divided by the value of the programming resistor. for example, the hcp current with a 110k resistor to gnd is: 11.4a 110k 1.25 r 1.25 i hcp hcp = = = charge current vs ihcp (or ilcp) 0 200 400 600 800 1000 1200 0.00 50.00 100.00 150.00 ihcp (in ua) charge current (in ma) using the table below it can be seen that for a programming current value of 11.4a, the corresponding maximum charge current is 92ma. the termination current determines the point at which the charge cycle is terminated and the battery is determined to be fully charged. the termination current is determined by the value of the hcp programming current as determined by the hcp programming resistor. for a value of ihcp = 11.4a (as was used in the previous example), the termination current from the chart below can be seen to be 9ma. termination current vs ihcp 0 20 40 60 80 100 120 0.00 50.00 100.00 150.00 ihcp (in ua) termination current (in ma) the termination current is always roughly 10% of the maximum charge current set by the hcp resistor. a a p p p p l l i i c c a a t t i i o o n n s s
lx2206 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 9 copyright ? 2007 rev. 1.3a, 2007-08-28 www. microsemi . com dual level lithium ion battery charger tm ? application note b attery t emperature m onitor the lx2206 has an input to monitor the battery temperature during battery charging; this method assumes the battery pack contains a thermistor expressly for this purpose. a typical lithium ion battery should only be charged from a range of 0 c to 60 c. for this calculation, a vishay nths0402n01n1003j thermistor was used. this thermistor is 327k ? at 0 c, 100k ? at 25 c and 24.9k ? at 60 c. the thermistor must be biased with a th evenin voltage source and series resistance to achieve the proper thresholds. a fixed value resistor is added in series with the thermistor to prevent it from becoming too low an impedance at high temperatures and causing the tmp input to default to off. v th r th r ntc r min tmp using a value of r min that is equal to the thermistor temperature at 60 c works well; therefore, for this example, set the value of r min to 24.9k. this has the effect of adding 24.9k to the thermistor resistance values so it becomes 352k ? at 0 c, 125k ? at 25 c and 49.8k ? at 60 c. the equations for r th and v th are: () ()( ) 0.99 k r 0.74 r 0.29 r r 0.74 0.29 v v 60c t 0c t 60c t 0c t in th = = ? ? = = = = = 121k r 1 0.74 k r 0c t th = ? ? ? ? ? ? ? = = where r at temperature is the sum of the thermistor plus r min . to finish the design it is necessary to create the thevenin voltage and resistance using a voltage divider from the input pin (in). v in r 1 r ntc r min tmp r 2 the values of r1 and r2 can be calculated as: 122k k th r 1 r = = 14,800k th r 1 r th r 1 r 2 r = ? = in this case, it is not nece ssary to use r2, because the value is so large it is insignificant. in this case, r1 = r th. a a p p p p l l i i c c a a t t i i o o n n s s
lx2206 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 10 copyright ? 2007 rev. 1.3a, 2007-08-28 www. microsemi . com dual level lithium ion battery charger tm ? application note the final circuit for this example is: v in 121k r ntc 24.9k tmp the tmp voltages with this circuit are: temp (c) rntc vtmp (% vin) -20 971k 89% 0 327k 74% 25 100k 51% 60 24.9k 29% 80 12.6k 24% p ower s tatus i ndicators the stat pin is designed to source or sink current. leds can be configured to indicate charging or battery full. the battery full indicator can be co nnected to dcok rather than gnd to insure it is off when the input power is removed and the stat pin and dcok pin go to a high impedance state. conditions stat charge in process low charge completed high input power removed hi z i nput p ower s ource d etection in order to detect when the input power source has been removed, the lx2206 requires that a small current (up to 200ua) momentarily flow out of the in pin (in the reverse direction). once detected, the re verse in current is shut off (the in pin becomes a very high impedance until an input power source is later reapplied). in most applications, there is sufficient loading on the in pin from external circuitry to accomplish this, which includes the ?full? and/or ?power on? led loads and the tfb resistor string. if there is no external load on the in pin, then it is recommended to provide a 15k resistor from in to gnd as shown below. adapter or usb 0.47uf 1k in cmp lx2206 15k a a p p p p l l i i c c a a t t i i o o n n s s
lx2206 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 11 copyright ? 2007 rev. 1.3a, 2007-08-28 www. microsemi . com dual level lithium ion battery charger tm ? charging profile conditioning current battery charging usb high level 3.90 3.95 4.00 4.05 4.10 4.15 4.20 4.25 0.0 60.0 120.0 time in minutes battery voltage 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 battery cuuren t vbat ibat conditioning current vs ihcp 0 10 20 30 40 50 60 0.00 50.00 100.00 150.00 ihcp (in ua) conditioning current (in ma) float voltage termination current c c h h a a r r t t s s
lx2206 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 12 copyright ? 2007 rev. 1.3a, 2007-08-28 www. microsemi . com dual level lithium ion battery charger tm ? constant current conditioning current c c h h a a r r t t s s
lx2206 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 13 copyright ? 2007 rev. 1.3a, 2007-08-28 www. microsemi . com dual level lithium ion battery charger tm ? package dimensions ld 10-pin plastic mlp dual exposed pad d e a a3 d2 e2 b l e a1 top view bottom view m illimeters i nches dim min max min max a 0.80 1.00 0.0315 0.0394 a1 0 0.05 0 0.0019 a3 0.20 ref 0.0079 ref b 0.18 0.30 0.0071 0.0118 d 3.00 bsc 0.1181 bsc d2 2.23 2.48 0.0878 0.0976 e 0.50 bsc 0.0197 bsc e 3.00 bsc 0.1181 bsc e2 1.49 1.74 0.0587 0.0685 l 0.30 0.50 0.0071 0.0197 note: 1. dimensions do not include mold flash or protrusions; these shall not exceed 0.1 55mm(.006?) on any side. lead dimension shal l not include solder coverage. m m e e c c h h a a n n i i c c a a l l s s
lx2206 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 14 copyright ? 2007 rev. 1.3a, 2007-08-28 www. microsemi . com dual level lithium ion battery charger tm ? notes production data ? information contained in this document is proprietary to microsemi and is current as of publication date. this document may not be modified in any way without the express written consent of microsemi. product processing does not necessarily include testing of all parameters. microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time. n n o o t t e e s s

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