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lx2203a p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 2004 rev. 1.0a, 2005-10-21 www. microsemi . com li-ion battery charger tm ? descri pt i on the microsemi lx2203a is a tiny linear battery charger for lithium ion or lithium polymer batteries. the lx2203a includes built in mosfet, accurate current and voltage regulation, reverse blocking protection, over temperature control, and charge status indicator. the accurate programmable charge current and independent termination current programming make it easy to logically reprogram the charge current limit at any time. the lx2203a charges the battery in two phases: constant current and constant voltage. a reduced current conditioning mode is provided for deeply discharged batteries. the lx2203a automatically restarts if the battery voltage falls below the top-off threshold. the lx2203a enters a low quiescent current sleep mode when power is removed. the lx2203a is backward compatible with the lx2203. the difference is the lx2203a can terminate charging while using ccp resistors ranging from 90k to 1.5m and the lx2203 from 90k to 400k. important: for the most current data, consult microsemi s website: http://www.microsemi.com k ey feat u r es ? up to 1a charge current ? low drop out design ? reverse leakage protection ? linear thermal control loop ? pre-charge conditioning ? programmable termination current ? short circuit protected ? small 3x3mm mlp package appli c at i on s ? pdas, mp3 players ? cell phones ? charging cradles ? digital cameras produ ct h i gh li gh t lx2203a vin vin stat ctp gnd bat bat cmp en ccp ac/dc adapter on/off + _ en mode 0 sleep mode C charge disabled 1 charge enabled. pack age order i n fo ld plastic mlp 10-pin t a ( c) rohs compliant / pb-free -40 to 85 LX2203AILD note: available in tape & reel. append t he letters tr to the part number. (i.e. LX2203AILD-tr) l l x x 2 2 2 2 0 0 3 3 a a downloaded from: http:///
lx2203a p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 2 copyright ? 2004 rev. 1.0a, 2005-10-21 www. microsemi . com li-ion battery charger tm ? absolu t e m ax i m u m rat i n gs supply voltage (vin )....................................................................................... -0.3v to 7v input signals (shdn, en ,cmp) ...................................................................... -0.3v to 7v battery charging current (i bat )....................................................................................1.2a operating junction temper ature................................................................... -40c to 150c storage temperature ra nge.........................................................................-65 c to 150c peak package solder reflow temp(40 seconds max. 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 10-pin thermal resistance - junction to a mbient , ja 49 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 12 3 4 56 7 8 9 10 vin vin stat ctp bat en cmp bat gnd ccp connect bottom to power gnd ld p ackage (top view) rohs / pb-free 100% matte tin lead finish fu n ct i on al pi n descri pt i on name description bat charging output - this pin is wired to the positive termi nal of the battery. (the negative battery terminal is wired to gnd.) ccp charge current programming pin - a resistor (rccp) is co nnected between this pin and gnd. see application section for programming information. cmp compensation pin C apply a 0.01f capacitor between cmp and vin pins. ctp charge termination programming pin C a resistor (rctp) is connected between this pin and gnd see application section for programming information. en enable - applying a ttl compatible hi signal enables th e charger, a low signal disables the charger and puts it in sleep mode. gnd common ground. stat status - this pin is a logic low level when the battery is being charged. pin can sink up to 5ma. vin voltage input C suppl y voltage. must be greater than vbat to charge. 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:///
lx2203a p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 3 copyright ? 2004 rev. 1.0a, 2005-10-21 www. microsemi . com li-ion battery charger tm ? elect ri cal ch a ract eri st i cs unless otherwise specified, the following specifi cations apply over the ambient temperature 0 c t a 70 c except where otherwise noted and the following test conditions: v vin = 5v, v bat =3.8v, r ccp = 90.9k, r ctp = 150k. lx2203a parameter symbol test conditions min typ max units ` main circuitry input voltage v vin 4.35 6 v v en = hi 3 5 ma quiescent current i gnd v en = lo 7 a ctp bias voltage v ctp 1.25 v ccp bias voltage v ccp 1.25 v ` constant voltage mode bat output voltage v bat(max) 4.16 4.2 4.24 v top off charge droop threshold v drp v drp /v bat(max) 96 97 98 % charge termination taper current v bat = v bat(max) 42 51 60 ma taper current @ low charge level v bat = v bat(max); r ccp = 1.2m 37 48 60 ma ` constant current mode bat constant current 0.9 1.0 1.1 a conditioning current i cond v bat < v bat(cond) 4% 5% 6% bat cond i i conditioning current mode threshold voltage v bat(cond) v bat(cond) /v bat(max) 60 63 66 % ` logic stat logic high output v stat i stat = -100ua 4.5 v stat logic low output v stat i stat = 5ma 0.5 v logic hi 2.0 en select threshold v en logic lo 0.8 en bias current i en v en = hi 8 a ` thermal shutdown maximum junction temperature t j 150 c ` pass element reverse mode current -i bat v vin < v bat 5 a ` under voltage lockout rising threshold voltage v uvlo+ 4.2 v falling threshold voltage v uvlo- 3.9 v 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:///
lx2203a p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 4 copyright ? 2004 rev. 1.0a, 2005-10-21 www. microsemi . com li-ion battery charger tm ? ch argi n g profi le ch arge cu rren t program m i n g voltage current charge voltage and current charge time (hours) 0 0.5 1.0 1.5 2.0 2.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 charge current (ma) iccp current (a) 0 4.0 8.0 12.0 16.0 0 200 400 600 800 1000 1200 constant charge current programming t erm i n a t i on cu rren t program m i n g ch arge v olt age di st ri bu t i on termination current (ma) 1/rctp (micromhos) 0 2 04 06 08 01 0 0 0 200 400 600 800 termination current programming 4.171 4.174 4.176 4.179 4.181 4.183 4.186 4.188 4.191 4.193 4.196 4.198 4.201 4.203 4.206 4.208 4.210 4.213 4.215 4.218 4.220 4.223 4.225 4.228 4.230 v 0 50 100 150 200 250 300 c out post trim bat volt 1 .0 a ch arge cu rren t di st r i bu t i on 5 0 m a t erm i n at i on di st ri bu t i on -1.087 -1.080 -1.073 -1.066 -1.059 -1.052 -1.045 -1.038 -1.031 -1.024 -1.017 -1.010 -1.003 -996.327e-03 -989.388e-03 -982.449e-03 -975.510e-03 -968.571e-03 -961.633e-03 -954.694e-03 -947.755e-03 -940.816e-03 -933.878e-03 -926.939e-03 -920.000e-03 0 10 20 30 40 50 60 70 count a charge current post trim 0 200 400 600 800 1000 1200 1400 -60 -56 -52 -48 -44 -40 -36 -32 -28 -24 -20 more ma count c c h h a a r r t t s s downloaded from: http:///
lx2203a p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 5 copyright ? 2004 rev. 1.0a, 2005-10-21 www. microsemi . com li-ion battery charger tm ? si m pli fi ed block di agram vdd bat charge control gnd constant current control ccp temperature control constant voltage control charge termination control ctp stat cmp enable en uvlo + - conditioning threshold condition current lx2203a figure 1 C simplified block diagram 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:///
lx2203a p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 6 copyright ? 2004 rev. 1.0a, 2005-10-21 www. microsemi . com li-ion battery charger tm ? t h eory of o perat i on start yes v bat >60% condition charge mode no yes constant current charge mode temp < 150 reduce charge current yes no v bat > v cv constant voltage charge mode yes no i bat v uvlo no yes v in > v bat no figure 2 C control flow diagram 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:///
lx2203a p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 7 copyright ? 2004 rev. 1.0a, 2005-10-21 www. microsemi . com li-ion battery charger tm ? t y pi cal appli cat i on s lx2203a vin vin stat ctp gnd bat bat cmp en ccp ac/dc adapter on/off + _ figure 3 Cbasic charger from wall adapter with 1a constant current and 50ma termination current lx2203a vinvin stat ctp gnd bat bat cmp en ccp input power 2.7k 150k 0.01f + _ 165k 243k 1.21m cp2 cp1 on/off bss138dw-7 ibat cp1 cp2 100ma l l 500ma l h 1.0a h h figure 4 C wall adapter and usb charger (1a, 500ma, 100ma, selectable) 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:///
lx2203a p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 8 copyright ? 2004 rev. 1.0a, 2005-10-21 www. microsemi . com li-ion battery charger tm ? appli cat i on n ot e g eneral d escription the lx2203a is designed to charge a single cell lithium ion (li-ion) battery using two modes: a constant current mode, where the charge current is held constant and the battery terminal voltage rises to 4.2v; this is followed by constant voltage mode, where the battery voltage is held at 4.2v and the charge current starts to taper off. once the taper current reaches the charge te rmination current level the charge cycle is ended and the st at indicator turns off. if the fully charged battery terminal voltage drops to 4.07v, the battery charge cycle will be restarted. p rotection f eatures conditioning current mode C if the battery terminal voltage is less than 2.65v, the battery charger will reduce the charge current to 5%. this also protects the appliance from overheating by trying to drive the full charging current into a damaged battery. under voltage lockout C the charge cycle will not start until the vin voltage rises above 4.2v. hysteresis prevents 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 150 c. this does not cause the charge cycle to stop. reverse current blocking C if vin is grounded, current will not flow from the battery through the charger. no external blocking diode is required on the input. sleep mode C if the en pin is logic low or if vin is removed, the charger enters a sleep mode where a very low quiescent current prevents drain from the battery. l ayout g uidelines ? it is important when laying out the lx2203a to place 10f ceramic capacitors close to the vin and v bat ic terminals to filter switching transients. ? it is important to provide a low thermal impedance path from the thermal pad on the bottom of the lx2203a package to the ground plane of the circuit board to maximize the heat dissipation. to minimize charge time it is best not to rely on the thermal control feat ure as this feature will extend the charging time when activated. t ermination c urrent p rogramming the charge termination current (or minimum taper current) is set by selecting a value for the ctp resistor using the following formula: ctp term 7500 r= i for example, for a termination current of 50ma set r ctp = 150k. this formula applies to termination currents ranging from 20ma to 500ma. it is possible to change the termination current to different levels for different charge rate s. for a quick charge, the termination current can be set to about 50% of the constant current level; this charges the battery to about 75% capacity. for a full charge (taking several hours) the termination current can be set to 5% of the constant current level. the circuit below allows switching between the two levels: 150k 16.5k ctp quick/slow figure 5 C 500ma or 50ma termination current c onstant c harge c urrent p rogramming the charge current during th e constant current charge mode is programmable by controlling the current flowing from the ccp pin. a graph showing this relationship is included in this specification. the ccp pin is regulated to 1.25v when the charger is activ e. connecting a resistor from the ctp to ground will produce a ctp current of: ctp ccp 1.25 i= r (continued on next page) 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:///
lx2203a p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 9 copyright ? 2004 rev. 1.0a, 2005-10-21 www. microsemi . com li-ion battery charger tm ? appli cat i on n ot e (con t i n u e d) c onstant c harge c urrent p rogramming (c ontinued ) the table below lists some popular constant current settings along with the asso ciated ccp pin current and programming resistor: charge current i ccp current r ccp value 1.0a 13.75a 90.9k 500ma 6.22a 200k 100ma 1.00a 1200k it is possible to change the constant current setting by changing the r ccp resistor while in charge mode. since the termination current is independent of the charge current, lowering the constant charge current will increase the charge time, but will not reduce the stored charge in the battery at the charge termination point. the circuit in figure 4 is an example of a battery charger configured to charge at 1a, 500ma or 100ma. the switches are logically controlled and re duce the resistance at the ccp pin when switched in. it is possible to eliminate the mosfet devices if open drain logic is available. the logic for the cp1 and cp2 would normally come from the appliance processor which would need to have the capability to communicate over the usb interface. if there is only one power connector and the usb interface is active, the logic could assume the power was coming from the usb bus and not the wall adapter. if the usb interface is active, the usb application will know if the appliance has been enumerated as a high or low load and would set cp1 and cp2 appropriately. it is possible to change the current programming circuit to drive it directly with cmos logic, but this requires that the cmos logic power supply be well regulated (2%). each switch resistor leg in figure 4 can be replaced with a two resistor network tied to the output of a cmos gate. 1.21m r1 ccp r2 vcc 500ma/100ma 1.21m 243k ccp 500ma/100ma rsw figure 6 C circuits to provide 100ma and 500ma constant charge currents. the values of r1 and r2 are selected such that: 25.1 r r r v 2 1 2 cc = + & sw 2 1 2 1 r r r r r = + solving these equations: 25.1 r v r sw cc 1 = & sw 1 sw 1 2 r r r r r ? = for v cc = 3.3v and r sw = 243k; r1 = 649k; r2 = 392k. these values should provide charge currents of 100ma and 500ma . c ompensation capacitor a compensation capacitor of value 0.01f is required between the cmp pin and v in. 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:///
lx2203a p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 10 copyright ? 2004 rev. 1.0a, 2005-10-21 www. microsemi . com li-ion battery charger tm ? pack age di m en si on s ld 10-pin plastic mlp dual exposed pad d e a a3 d2 e2 b l e a1 top view bot t om 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 0.155mm(.006) on any side. lead dime nsion 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:///
lx2203a p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 11 copyright ? 2004 rev. 1.0a, 2005-10-21 www. microsemi . com li-ion battery charger tm ? n ot es production data C 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 th e 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 downloaded from: http:///

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