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lx2202 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, 2006-02-09 www. microsemi . com 2a li-ion linear char ger and power control tm ? description the lx2202 linear battery charger is a multi-state (2 stage) li-ion battery charger (constant current / constant voltage) that is designed to minimize battery charge time (even from current limited sources such as usb) and provide a simplified interface to control battery discharge. lx2202 features up to 2a charging current from an ac adapter and an isolated battery topology to minimize charge time from current limited sources such as usb. a thermal control loop maintains a safe operating temperature at all times. the lx2202 provides a seamless complete battery interface. when the input power source is removed, the lx2202 provides the discharge path for the battery with extremely low discharge impedance. this eliminates the need for external discharge switch and voltage supervisors. in usb mode, the lx2202 provides three levels of current limit: 100ma, 500ma, and off. the lx2202 (compared to the lx2201) has improved charge and discharge mode detection circuitry. a uvlo feature prevents battery charging when vdd is less than 3.6v. the lx2202 uses three resistors to program the constant charge current level, for setting the termination charge current, and for varying the usb charge current limits. lx2202 support two types of li-ion battery chemistry; 4.1v and 4.2v through logical input (vm pin). the lx2202 provides a charging status indicator. the lx2202 features a pre-charge conditioning mode for batteries that have been deeply discharged and also has a top off charge mode for batteries that are left on the charger for extended periods. the lx2202 is available in a high power 4mm x 4mm, 20-pin mlp, surface mount package. important: for the most current data, consult microsemi ?s website: http://www.microsemi.com patent pending key features ? up to 2a charge current ? internal pass element can function as a reverse direction load switch ? usb compliant charging states using optional usb input ? isolated battery topology ? low rds on in discharge mode ? full capacity charging ? true charge indicator ? wall supply regulator tolerance 5v + 10% ? topping charge with voltage monitoring mode ? improved charge/discharge mode detection circuitry ? small, high power 20-lead mlp package ? selectable li-ion battery for 4.1v or 4.2v applications applications ? batteries up to 4ah ratings (c/2) ? cell phones ? pdas ? charging cradles ? digital cameras ? low cost single li-ion cell chargers product highlight 105k 2.55k 72.3k 2.49k charge indicator nu vid1 vid0 vm psw vdd usb vdd bat nu cus ct p ccp gnd bat cmp vdd vdd stat bat b220 10f 0.1f 10f lx2202 to vdd wall adapter main internal power bus power on/off state select truth table vid0 vid1 vdd > v bat v bat > vdd 0 0 switch open ? charging disabled. switch open ? discharge disabled. 0 1 charging ? usb high level if using usb . switch open ? discharge disabled. 1 0 charging ? usb low level if using usb . battery discharging. mosfet fully enhanced with current flow v bat to vdd. 1 1 charging ? usb high level if using usb . battery discharging. mosfet fully enhanced with current flow v bat to vdd. package order info lq plastic mlp 4x4mm 20-pin t a ( c) rohs compliant / pb-free -40 to 125 LX2202CLQ note: available in tape & reel. append the letters ?tr? to the part number. (i.e. LX2202CLQ-tr) l l x x 2 2 2 2 0 0 2 2
lx2202 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, 2006-02-09 www. microsemi . com 2a li-ion linear char ger and power control tm ? absolute maximum ratings supply voltage (v usb or v dd ) ..........................................................-0.3v to 7v analog input signals (vidx, vm, sns) .............................................-0.3v to 7v battery charging current (i bat ).........................................................................2a discharge current (i vdd )....................................................................................3a operating junction temperature.................................................................. 150 c storage temperat ure range...........................................................-65 c to 150 c usb maximum dc current .......................................................................500ma usb maximum surge current...........................................................................2a rohs / pb-free peak package solder reflow temperature (40 second 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 lq plastic micro lead frame quad package 20-pin thermal resistance - junction to a mbient , ja 40 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 vdd vdd vdd vdd usb cmp bat bat bat nu psw vid1 vid0 vm ccp stat ctp cus gnd 1 6 11 16 2 3 4 5 78910 12 13 14 15 17 18 19 20 pad is gnd nu lq p ackage (top view) rohs / pb-free 100% matte tin lead finish functional pin description name description bat charging output - this pin is wired to the positive terminal of the battery. (the negative battery terminal is wired to gn d.) ccp charge current programming pin - a resistor (rcp) is connect ed between this pin and gnd. the constant current is determined by the following relationship: ccp ) max ( bat r 73200 i = cmp compensation pin ? connect a 0.1f compensation capacitor from this pin to vdd. ctp charge termination programming pin ? a resistor (rtp) is co nnected between this pin and gnd. the termination charge current is determined by the following relationship: ctp ) min ( bat r 5250 i = cus maximum usb current programming pin ? a resistor (rus) is c onnected between this pin and gnd. the hi level charge current is determined by the following relationship: usb ) high ( usb r 1211 i = gnd common ground nu this pin is floating and will not affect performance. psw pmos switch driver ? this output is designed to drive the gate of an external pmos power switch. the driver is pulled low (pmos on state) when vdd > v bat . vdd common power node ? connects to system power bus. vidx state select input ? applying a two bit ttl compatible signal sets the desired state of the charger corresponding to the truth table. usb voltage input ? current limited usb input. apply a usb compliant power input. vm voltage mode select - selects the constant voltage charge level. wired to usb for 4.1v and gnd for 4.2v. stat status - this pin is a logic high level when the battery is bei ng charged. a low signal indicates either under voltage lockout, charge completed, or v bat > vdd, or vid0 = vid1 = 0. p p a a c c k k a a g g e e d d a a t t a a
lx2202 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, 2006-02-09 www. microsemi . com 2a li-ion linear char ger and power control tm ? electrical characteristics unless otherwise specified, the following specifi cations apply over the ambient temperature 0 c c except where otherwise noted and the following test conditions: vdd = 5.0v, vm = gnd, vid0 = vid1 = vbat, rccp = 72.3k, rctp = 105k, rusb = 2.55k. lx2202 parameter symbol test conditions min typ max units ` main circuitry input voltage vdd 4.5 6 v usb input voltage v usb 4.35 6 v under voltage charging lockout vdd uvlo vbat = 0; rising vdd 3.60 3.85 v vdd > v bat 2.1 4 ma vdd < v bat 20 40 a quiescent current i gnd vdd < v bat , vid0 = vid1 = 0v 9 15 a ctp bias voltage v ctp i bat > 100ma 1.26 v ccp bias voltage v ccp 1.26 v cus bias voltage v cus 2.6 v ` constant voltage mode vm = lo; -40c to 125c 4.16 4.2 4.24 constant voltage charge voltage v cvl vm = hi; -40 to 125c 4.06 4.1 4.14 v top off charge droop threshold v drp 96 97 98 bat cvl v % v ` constant current mode bat constant current accuracy i ccl 0.85 1 1.15 a conditioning current i cond v bat < v ctv ; @25c 3.0 4.6 6.0 bat ccl i % i conditioning current mode threshold voltage v ctv 2.8 v charge termination current accuracy i bat @25c 35 50 65 ma ` usb current limit usb low current limit i in v usb = 5v, vdd < v usb , vid1 = lo 85 93 100 ma usb high current limit i in v usb = 5v, vdd < v usb , vid1 = hi 425 463 500 ma ` logic stat logic high output v stat v usb = 5.0v, i stat = -5ma 4.5 5 v stat logic low output v stat v usb = 5.0v, i stat = 25a 0.4 v logic hi 2.0 state select threshold v vid logic lo 0.8 v logic hi 2.0 vm select threshold v vm logic lo 0.8 v ` thermal shutdown maximum junction temperature t j v usb = 5.0v, i out = 1a, temperature rising 130 140 150 c ` bi-directional pass element control discharge switch on resistance r ds(on) i bat = -1a (not tested) 130 150 m ` psw fet driver high output voltage v psw v usb < v bat , i psw = 0, v bat = 4.2v 4.1 4.2 v low output voltage v psw v usb > v bat , i psw = 0 0 0.2 v oring resistance r psw 5 10 15 k ` head room charging headroom vdd ? vbat, i batt = 5ma; not tested in production 65 mv discharging headroom vbat ? vdd, i batt = -20ma; not tested in production 65 mv e e l l e e c c t t r r i i c c a a l l s s
lx2202 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, 2006-02-09 www. microsemi . com 2a li-ion linear char ger and power control tm ? simplified block diagram usb 0.1 vdd bat charge/ discharge control gnd constant current control ccp temperature control constant voltage control usb limit control cus vm charge termination control ctp vid1 vid0 psw stat cmp uvlo figure 1 ? 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
lx2202 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, 2006-02-09 www. microsemi . com 2a li-ion linear char ger and power control tm ? application circuits start v sys > v bat yes discharge mode no v bat >60% condition charge mode no yes constant current charge mode temp < 140 reduce charge current i usb < prog yes reduce charge current yes no no v bat > v cv constant voltage charge mode yes no i bat vbat, uvlo or en change state. return to the top of the chart. lx2202 control flow diagram en = hi yes sw itch off no usb prog determined by the state of vid1. vid0 = 1 yes no vid1= 1 yes no uvlo yes no figure 2 ? 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
lx2202 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, 2006-02-09 www. microsemi . com 2a li-ion linear char ger and power control tm ? application schematics ac/dc adapter usb power usb lo / hi to system power bus 105k 2.55k 72.3k 2.49k charge indicator nu vid1 vid0 vm psw vdd usb vdd bat nu cus ctp ccp gnd bat cmp vdd vdd stat bat b220 1n4148 1n5817 irlms6802 10f 0.1f 10f lx2202 state select truth table vid0 vid1 vdd > v bat v bat > vdd 0 0 switch open ? charging disabled. switch open ? discharge disabled. 0 1 charging ? usb high level if using usb . switch open ? discharge disabled. 1 0 charging ? usb low level if using usb . battery discharging. mosfet fully enhanced with current flow v bat to vdd. 1 1 charging ? usb high level if using usb . battery discharging. mosfet fully enhanced with current flow v bat to vdd. figure 3 ? ac adapter and usb supply (charge and discharge modes) (1n4148 and irlms6802 are optional to lower usb voltage drop.) a a p p p p l l i i c c a a t t i i o o n n s s
lx2202 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, 2006-02-09 www. microsemi . com 2a li-ion linear char ger and power control tm ? charging current accuracy over t e m p termination current over temp 98 98.5 99 99.5 100 100.5 101 101.5 -55 -35 -15 5 25 45 65 85 ambient temperature (c) normalized current accuracy (%) 40 42 44 46 48 50 52 54 -55 -35 -15 5 25 45 65 85 am bient temperature (c) termination current (ma) constant current programming termination current vs ctp conductance 0 500 1000 1500 2000 2500 0.00 5.00 10.00 15.00 20.00 25.00 30.00 35.00 ccp current (ua) constant charge current (ma) 0 100 200 300 400 500 600 0.0 20.0 40.0 60.0 80.0 100.0 120.0 ctp conductance (in micromhos) termination current (in ma ) charging current over vdd voltage discharge mode dynamic response 0 200 400 600 800 1000 1200 33.544.5 battery voltage charge current (in ma) vdd = 4.3v vdd = 4.5v vdd = 5.0v vdd = 5.5v c c h h a a r r t t s s
lx2202 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, 2006-02-09 www. microsemi . com 2a li-ion linear char ger and power control tm ? charging profile discharge voltage drop 50 100 150 200 250 5 4 3 2 1 800 600 400 200 1000 battery voltage tim e (in m inutes) battery current (ma) stat voltage 0 0 50 100 150 200 250 0 500 1000 1500 2000 discharge current voltage drop (in mv) headroom control headroom vs battery current -80 -60 -40 -20 0 20 40 60 80 -100 -50 0 50 100 current flow into battery (ma) vdd - vbat (in mv) c c h h a a r r t t s s
lx2202 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, 2006-02-09 www. microsemi . com 2a li-ion linear char ger and power control tm ? theory of operation g eneral d escription the lx2202 is designed to charge a single cell lithium ion battery using two steps: a constant current step followed by a constant voltage step. the basic charger function uses the vdd pins as an input and bat pins as the output. the lx2202 charger has a programmable maximum current (programmable by the resistor value between pin ccp to gnd) which is the maximum charging current during the constant current mode of the charging profile. the low dropout of the pass element allows the battery to be charged from a loosely regulated power supply. in the constant voltage mode, the battery terminal voltage can be regulated to 4.1v or 4.2v by strapping the vm pin to vdd or gnd, respectively. the charger will terminate constant voltage charging once the current drops below the minimum current setting (programmable by the resistor value between pin ctp to gnd). the lx2202 has an integrated thermostat with a linear thermal regulation loop that will throttle back the charging current to prevent the internal die temperature from exceeding 150oc. this featur e prevents damage to the system board when the ic exceeds its thermal temperature. 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 ccp programmable constant current level (except where it might be limited in the usb states). once the battery terminal voltage exceeds the 60% level, 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 lx2202 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 charge status 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 lx2202 enters a voltage monitoring mode. in this mode the lx2202 monitors the battery terminal voltage and applies a top off charge if the battery voltage drops by more than 3% of full scale. this feature is especially importa nt for charging systems in equipment where usage is infrequent. usb c harge m ode the lx2202 is fully compliant with, and supports, the usb specifications ? the low power peripheral (100ma) and high power peripherals (500ma). vid1 logic input selects usb charge currents. the lx2202 senses the current flowing from the usb terminal to the vdd terminal; then it limits the usb current by reducing the current flowing from v dd to v bat . d ischarge m ode vid0 is used to enable discharge mode enable. the system load is connected to vdd. the input power is connected to vdd through an external diode. when the input power is removed, the battery current flows from v bat to vdd. the circuit of figure 3 shows the lx2202 in a discharge mode configuration with both ac adapter and usb inputs. the usb input is diode ored to the vdd pin and uses a mosfet to reduce the diode drop across the oring diode. the lx 2202 provides a signal ?psw? to control the mosfet for charge and discharge modes. when both ac and usb power are applied the psw signal is overridden by the ac adapter diode and the mosfet is turned off under voltage lock out the lx2202 has an under voltage lock-out feature that monitors the vdd terminal and prevents the battery charger from entering charge mode if the vdd terminal is less than 3.6v (nominal). a a p p p p l l i i c c a a t t i i o o n n s s
lx2202 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, 2006-02-09 www. microsemi . com 2a li-ion linear char ger and power control tm ? application note r educed usb c harge t ime the lx2202 has an isolated battery topology which reduces charge time from usb wh en the appliance is turned on while also charging. beca use the system power rail can be a higher voltage than the battery voltage, the system will require less power from the usb source which leaves more power available to charge the battery which charges the battery faster. for example, if the system draws 1w, and the usb input is 5v, the system draws 1w/5v = 200ma from the usb source; this leaves 300ma to charge the battery. in a topology where the load connects directly to the battery (as is done with co nventional linear chargers), if the average battery voltage is 3.7v, the system will draw 1w/3.7v = 270ma from the usb source, this leaves only 230ma to charge the battery. in this case the lx2202 will charge the battery 30% faster. c urrent l imited p ower s upplies the lx2202 has special headroom voltage regulation circuitry that allows charging from current limited power sources. the lx2202 increase s the impedance of the pass element under small charge or discharge currents so that mode change situations can be more readily detected by the internal circuits. this improved mode discrimination allows the battery to aid the current limited input power supply when the system load demands it and to switch back to charge mode when the system power demand is reduced. usb c ompliance to be compliant with the usb specification, the +5v current must be less than 100ma in the low power mode and less than 500ma in the high power mode. if the lx2202 is configured as shown in figure 3, it is possible for the system to consume more than the maximum allowed usb current (in whic h case the battery charging current will have been fully s caled back). if it is not possible to regulate the load current when charging from a usb power source and strict adherence to the usb power budget is required, in this case the system load can be applied directly across the battery and the lx2202 will prevent the combination of the load plus battery from drawing more power than is allowed for usb compliance. l ayout g uidelines ? it is important when laying out the lx2202 to place 10f ceramic capacitors close to the vdd 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 lx2202 package to the gr ound plane of the circuit board to maximize the heat dissipation. a a p p p p l l i i c c a a t t i i o o n n s s
lx2202 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, 2006-02-09 www. microsemi . com 2a li-ion linear char ger and power control tm ? package dimensions lq 20-pin mlpq plastic 4x4mm (114x114dap) e a e b e2 d2 l d a3 a1 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 b 0.18 0.30 0.007 0.088 d 4.00 bsc 0.157 bsc d2 2.59 2.79 0.102 0.110 e 4.00 bsc 0.157 bsc e2 2.59 2.79 0.102 0.110 e 0.50 bsc 0.019 bsc l 0.30 0.50 0.011 0.019 m m e e c c h h a a n n i i c c a a l l s s
lx2202 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 12 copyright ? 2004 rev. 1.0a, 2006-02-09 www. microsemi . com 2a li-ion linear char ger and power control 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 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

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