View LX2207ILD_9038720.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

lx2207 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. 1.0a, 2007-10-08 www. microsemi . com three level lithium ion battery charger tm ? descri pt i on the lx2207 can use a wall adapter or usb power source to charge a single cell lithium ion or lithium polymer battery. there are three logic selectable and programmable charge current levels: the high charge programming level is typically set for charging from the adapter, the low level charge programming level is typically set to 500ma for usb full usb charging and 100ma (20%) for reduced level usb charging. in addition to setting the high-level charge current, the hcp programming resistor also sets the termination current at 10% of the constant current level and the conditioning current at 5% of the constant current level. power status indicators (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 and can sink 20ma. the lx2207 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, 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 k ey feat u r es ? three charge levels for adapter, and usb hi and low ? 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 temp monitor ? precision charge termination ? power good indication appli c at i on s ? mp3 player ? pda ? pmc ? digital camera ? charge cradle produ ct h i gh li gh t pack age order i n fo ld plastic mlpd 12-pin t a ( c) rohs compliant / pb-free -40 to 85 LX2207ILD note: available in tape & reel. append the lett ers tr to the part num ber. (i.e. LX2207ILD-tr) l l x x 2 2 2 2 0 0 7 7 downloaded from: http:///
lx2207 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. 1.0a, 2007-10-08 www. microsemi . com three level lithium ion battery charger tm ? absolu t e m ax i m u m rat i n gs 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 peak temp. for solder reflow (40 s econds maximum expos ure).................. 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 . t h erm al dat a ld plastic micro leadframe package 12-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. pack age pi n ou t bat tmp hcp lcp gnd sd stat cmp in 20% dcok h/l 12 3 4 5 67 8 9 10 11 12 ld package (top view) rohs / pb-free 100% matte tin finish 2207xxxx msc part marking xxxx = denotes date and lot code identification fu n ct i on al pi n descri pt i on name pin # description bat 12 battery C connect to a singl e cell lithium ion battery. cmp 2 compensation C connect a series combination of a 1k resistor and a 0.47f capacitor from cmp to in. dcok 4 power status logic pin and led driver C 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 7 ground C connect to the system ground. hcp 10 high current programming (and termination current progr amming) C 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 8 high or low load select logic input C a logic high selects the constant charge current level set by the hcp pin resistor and a logic low selects the constant charge current level set by the lcp pin resistor in 1 input power C connect to a wall adapter or a usb power plug. lcp 9 low current programming C connect a resistor to ground to set the constant current low level. for a value of 19.6k, the high current is 460ma and the 20% current is 92ma. sd 5 shutdown C a logic high places the lx2207 in sleep mode; can also be used for usb suspend. stat 3 charging status logic pin and led driver C this pin can source or sink 10ma of current to drive an external led in either output state. this pin is low (current sinking mode) when the battery is in charging mode and becomes high (current sourcing mode) when the char ge cycle is finished. it becomes high impedance when the input power is removed. tmp 11 battery temperature monitor C this sense pin deter mines the battery temperature for charging out of temperature range lockout and is connected to a resistor network as defined in the applications section. the tmp pin is grounded if this function is not used. 20% 6 20% select logic input C when the low current level is selected by the h/l pin, a logic high on 20% selects the constant charge current level set by the lcp pin resistor and a logic low selects 20% of this value. p p a a c c k k a a g g e e d d a a t t a a downloaded from: http:///
lx2207 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. 1.0a, 2007-10-08 www. microsemi . com three level lithium ion battery charger tm ? elect ri cal ch a ract eri st i cs the following specifications apply over the operating ambient temperature -40 c t a 85 c except where otherwise noted and the following test conditions:. in = 5.0v; sd = low; h/l = high, 20% = high; bat = 3.6v; h cp =12.1k, lcp=19.6k; tmp = 0v. lx2207 parameter symbol test conditions min typ max units ` input circuitry input voltage v in 4.35 6 v battery voltage v bat 4.3 v under voltage charging lockout v in 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 bat i bat < 100ma 4.16 4.2 4.24 v constant voltage charging v bat 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 665 710 772 ma h/l = low 430 460 495 ma max battery charge current i bat h/l = low, 20% = low 84 92 97 ma conditioning current i bat v bat < vcct 13 23 33 ma conditioning current i cond v bat < vcct; hcp = 110k 2.6 4.6 7.8 ma conditioning current threshold v bat rising battery voltage 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 charge droop threshold v bat 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 stat v in = 5.0v, i drv = -10ma 4.2 4.5 5 v stat logic low output v stat v in = 5.0v, i drv = 10ma 0.5 v logic hi, 1.2 input logic : sd, h/l, 20% 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, v log = 2v -2 -0.8 2 input current : 20% i 20%(in) logic lo, v log = 0v -2 -0.8 2 ua 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 v in v cold temp fault threshold v cold falling threshold 0.72 x v in v falling threshold 0.28 x v in v hot temp fault threshold v hot rising threshold 0.30 x v in v tfb disable voltage v dis 75 100 150 mv temp loop regulation 130 140 150 c e e l l e e c c t t r r i i c c a a l l s s downloaded from: http:///
lx2207 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. 1.0a, 2007-10-08 www. microsemi . com three level lithium ion battery charger tm ? si m pli fi ed block di agram 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 20% b b l l o o c c k k d d i i a a g g r r a a m m downloaded from: http:///
lx2207 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. 1.0a, 2007-10-08 www. microsemi . com three level lithium ion battery charger tm ? con t rol logi c d i agram start v in > v bat yes sleep no v bat >60% condition charge mode no yes constant current charge mode temp < 140 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 and 20%. 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 downloaded from: http:///
lx2207 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. 1.0a, 2007-10-08 www. microsemi . com three level lithium ion battery charger tm ? appli cat i on ci rcu i t s adapter or usb power pin shutdown current programming control logic status battery temperature lockout sensing in bat sd h/l hcp tmp dcok stat gnd cmp charging full power on battery lcp 2.49k2.49k 2.49k 12.1k 19.6k 24.9k 121k 0.47u grounded pin in usb cable. leave open in adapter cable. 10k lx2207 usb hi/low 20% 1k figure 1 C typical application C 750ma adapter charge current and 500ma or 100ma maximum usb charge currents. a grounded spare pin in the usb power cable can be used to sense when the 500ma usb current power source is being used. this application also uses three led indicators for power attached, battery charging and battery full. this configuration also implements circuitry to lockout battery charging if the battery is less than 0c or greater than 60c. a a p p p p l l i i c c a a t t i i o o n n s s downloaded from: http:///
lx2207 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. 1.0a, 2007-10-08 www. microsemi . com three level lithium ion battery charger tm ? t h eory of o perat i on g eneral d escription the lx2207 charges a singl e 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 current). a 20% logic input selects either the full current set by the lcp resistor or 20% of that value. 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 one of the other charger control loops limits charging current). c harge t ermination m ode to increase system battery life and avoid float charging, the lx2207 turns off the pass element once the battery is fully charged. the charge termination state occurs at the end of constant voltage mode. the value of the resistor connected to the hcp programming pin sets the termination current. the stat pin changes state when charge cycle has completed. t op o ff c harge m ode once the charger has completed a charge cycle, if power remains applied, the lx2207 enters a voltage monitoring mode. in this mode the lx2207 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 lx2207 supports battery charging 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 proc essor senses the absence of usb data, it can logically set the h/l logic level high for the wall adapter. usb c harge m ode and current limit the lx2207 is fully compliant with, and supports, the usb specifications C the low power peripheral (100ma) and high power peripherals (500ma). usb current levels can be set using the appropriate values for the lcp programming resistor. 20% 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 C 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 C the charge cycle will not start until the in voltage rises above 3.8v. hysteresis helps alleviate chattering on and off. thermal control loop C 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 C 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 C 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 downloaded from: http:///
lx2207 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. 1.0a, 2007-10-08 www. microsemi . com three level lithium ion battery charger tm ? appli cat i on n ot e 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 lx2207 stays cool and can provide the maximum charge current to minimize the time required to charge the battery. for stability, and to reduce turn on C turn off transients, it is important to place capacitors close to the in and bat pins. use a 10uf capacitor (x5r or x7r dielectric) for this purpose. the cmp pin resistor and capacitor should be located close to the cmp pin. the cmp pin is located next to the in pin to facilitate this. the 1k resistor is not required for stability, but reduces the inrush current into the cmp pin when the in voltage transient is applied. c urrent p rogramming r esistors the lx2207 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. i ndependent termination c urrent programming for applications where a term ination current other than 10% is required, the termination current can be set using the hcp resistor and the charge current can be set using the lcp resistor. in this case, the h/l pin is held low so that the hcp charge mode is never utilized. in this way the hcp pin only programs the termination current and conditioning 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 downloaded from: http:///
lx2207 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. 1.0a, 2007-10-08 www. microsemi . com three level lithium ion battery charger tm ? appli cat i on n ot e b attery t emperature m onitor the lx2207 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 0ct 60c t 0ct in th = = ? ? = = = = = 121k r 1 0.74 k r 0ct 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 r r th 1 = = 14,800k r r r r r th 1 th 1 2 = ? = 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 . 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 (% v in ) -20 971k 89% 0 327k 74% 25 100k 51% 60 24.9k 29% 80 12.6k 24% a a p p p p l l i i c c a a t t i i o o n n s s downloaded from: http:///
lx2207 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. 1.0a, 2007-10-08 www. microsemi . com three level lithium ion battery charger tm ? appli cat i on n ot e 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 connected 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 i nput p ower s ource d etection in order to detect when the input power source has been removed, the lx2207 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 lx2207 15k ch argi n g profi le con di t i on i n g cu rren t 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) c c h h a a r r t t s s downloaded from: http:///
lx2207 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. 1.0a, 2007-10-08 www. microsemi . com three level lithium ion battery charger tm ? con st an t v olt age con st an t cu rren t (u sb low) 2 0 % ch arge rat i o adapt er ch arge cu rren t con di t i on i n g cu rren t t erm i n a t i on cu rren t c c h h a a r r t t s s downloaded from: http:///
lx2207 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. 1.0a, 2007-10-08 www. microsemi . com three level lithium ion battery charger tm ? cold t m p t h resh olds (v i n = 5 v ) h ot t m p t h r esh olds (v i n = 5 v ) rising voltage: falling voltage: rising voltage: falling voltage: c c h h a a r r t t s s downloaded from: http:///
lx2207 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. 1.0a, 2007-10-08 www. microsemi . com three level lithium ion battery charger tm ? pack age di m en si on s ld 12-pin plastic mlp dual exposed pad e d e a3 a1 a e2 d2 l pin 1 id k b m illimeters i nches dim min max min max a 0.80 1.00 0.031 0.039 a1 0.00 0.05 0.000 0.002 a3 0.20 ref 0.008 ref d 3.00 bsc 0.118 bsc e 3.00 bsc 0.118 bsc d2 1.87 2.12 0.074 0.083 e2 1.06 1.31 0.042 0.052 e 0.45 bsc 0.018 bsc k 0.20 min 0.008 min l 0.30 0.50 0.012 0.020 b 0.15 0.25 0.06 0.010 note: 1. dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm(.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 downloaded from: http:///
lx2207 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. 1.0a, 2007-10-08 www. microsemi . com three level lithium ion battery charger tm ? n ot es n n o o t t e e s s downloaded from: http:///

▲Up To Search▲

Price & Availability of LX2207ILD

	To Download LX2207ILD Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .