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preliminary datasheet lp280 0 9 lp280 0 9 C 0 2 may . - 20 1 3 email : marketing@lowpowersemi.com www.lowpowersemi.com page 1 of 12 single and dual cell li + battery charge r ic C LP28009 general description the LP28009 is a fully integrated low cost single - cell and dual cell li - ion battery charger ic ideal for portable applications. the LP28009 is capable of being powere d up from ac adapter. the LP28009 enters sleep mode when ac adapter is removed. the LP28009 optimizes the charging task by using a control algorithm including preconditioning mode, fast charge mode and constant voltage mode. the charging task is terminated as the charge current drops below the preset threshold. the ac adapter charge current can be programmed up to 1 .2 a with an external resister. the internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures. the LP28009 features 18v maximum rating voltages for ac adapter. the other features are under voltage protection, over voltage protection for ac adapter supply and battery temperature monitoring. order information LP28009 f: pb - free package type sp : sop - 8 (ep) output voltage 42: 4.2v 84: 8.4v applications ? portable media players/mp3 players ? cellular and sma rt mobile phone ? pda/dsc ? bluetooth applications features ? 18v maximum rating for ac adapter ? internal integrate p - mosfets ? ac adapter power good status indicator ? charge status indicator ? under voltage protection ? over voltage protection ? automatic rechar ge feature ? battery temperature monitoring ? small 8 - lead sop(ep) package ? thermal feedback optimizing charge rate ? r ohs compliant and 100% lead (pb) - free marking information ty pical application circuit device marking package shipping LP28009 sp:sop - 8 3k/reel battery q1 lpm9013 red i/o ctrl 10uf 10uf pgood 3 chrg_s 2 gnd 4 iseta 5 acin 1 en 6 batt 8 nc 7 gnd 9 LP28009-42spf vin q8 lpm9013 red i/o ctrl 10uf 10uf vin pgood 3 chrg_s 2 gnd 4 iseta 5 acin 1 en 6 batt 8 nc 7 gnd 9 LP28009-84spf batt
preliminary datasheet lp280 0 9 lp280 0 9 C 0 2 may . - 20 1 3 email : marketing@lowpowersemi.com www.lowpowersemi.com page 2 of 12 functional pin description p ac k age t y pe p in c onf ig ur at i ons e sop - 8 pin description p in n o p in n ame p in f unc t ion 1 ac i n wall ad apt or c har ge i nput supply . 2 c h g_ s c har ge st at us i ndic at or o ut put (o pen dr ain) . 3 pg o od pow er g ood i ndic at or o ut put( o pen dr ain) . 4 g n d g r ound. 5 i set a wall adapt or s upply c har ge c urr ent set point . 6 en c har ge e n able i nput ( ac t iv e low ) . 7 nc n o i nt er nal c onnec t ion. 8 bat t bat t er y c har ge c ur r ent o ut put . t his pin pr ov ides c har ge c ur r ent t o t he bat t ery and r egulat es t he f inal f loat v olt age t o 4. 2 or 8. 4v. an int er nal pr ec is ion r es ist or div ider fr om t his pin s ets t he f loat v olt age w hic h is disc onnec t ed i n s hut dow n mode. 9 ( ex pos ed pad) p g n d ex pos ed pad should be s older ed t o pc b boar d and c onnec t ed t o g n d . note: LP28009 - 42 s p f and LP28009 - 84 s p f of battery (pin 8 ) is output pin, the pin connector to battery. a c i n c h g _ s p g o o d g n d b a t t e n n c i s e t a 1 2 3 5 6 7 8 p g n d 9 4
preliminary datasheet lp280 0 9 lp280 0 9 C 0 2 may . - 20 1 3 email : marketing@lowpowersemi.com www.lowpowersemi.com page 3 of 12 function block diagram
preliminary datasheet lp280 0 9 lp280 0 9 C 0 2 may . - 20 1 3 email : marketing@lowpowersemi.com www.lowpowersemi.com page 4 of 12 LP28009 - 42 flow chart LP28009
preliminary datasheet lp280 0 9 lp280 0 9 C 0 2 may . - 20 1 3 email : marketing@lowpowersemi.com www.lowpowersemi.com page 5 of 12 absolute maximum ratings vin, vbatt, vchgsb, vp g ood, ven ------- --- ----------------------- ------------------------------------ - 0.3v to 15v storage temperature range --- ----------------- ------------- --------------------------------------------------- - 65 to 150 viseta ------------------------- ------------------------ -------------------------------------------------------------- - 0.3v to 3.6v junct ion temperat ure (tj) ---- - ------------------------- ------- ------------ ------------------------ ---- 150 lead temperature (soldering,10 sec.) --------------- ---- -------------------- ---- ------------------------------------------- 260 operating ratings supply voltage --------------------------------- ----------- ------------------------------------ ------------------------------- 9v to 13.5v thermal resistance( /w operating temperature range ---------------------- -------------------- -------------------------------------------- - 40 to 85 electrical characteristics (ta=25 , vin=10v; unless otherwise specified. ) symbol parameter conditions min typ max units vin input operating voltage range 9 10 13.5 v icc input supply cu rrent charge mode.rset=30k 300 ua standby mode (charge terminated) 250 ua shutdown mode (rset not connected vin < vbatt or vin < vuv) 190 ua vfloat regulated output(float) voltage 0 ta 85 8.316 8.4 8.484 v ibatt batt pin current rs et=1.5k,current mode 500 ma rset=0.75k,current mode 1000 ma standby mode, vbatt=8.4v - 1 0 1 ua shutdown mode - 1 0 1 ua sleep mode, vin=0v - 1 0 1 ua itrickle trickle charge current vbatt preliminary datasheet lp280 0 9 lp280 0 9 C 0 2 may . - 20 1 3 email : marketing@lowpowersemi.com www.lowpowersemi.com page 6 of 12 threshold voltage vin from low to high 60 mv iterm c/10termination current threshold rset=1.5k 0.1 ma/ ma rset=0.75k 0.1 ma/ ma vset iseta pin voltage rset=1.5k,current mode 1.5 v ichg _sb chg_sb pin weak pull - down current vchg_sb=5.0v 25 ua vchg_sb chg_sb pin output low voltage ichg_sb=5ma 0.35 v vpgood pgood pin output low voltage ipgood_sb=5ma 0.35 v p arameter s ymbol t est c ondition s m in t yp m ax u nits precharge batt pre - cha rge rising threshold vprech 2.6 2.8 3 v batt pre - charge threshold hysteresis ? vprech 50 100 200 mv pre - charge current ipchg vbatt=2v 8 10 12 % recharge threshold batt pre - charge falling threshold hysteresis ? vprech_l vreg C vbatt 60 100 150 mv c harg e termination detection termination current ratio(default) iterm vbatt=4.2v -- 10 -- % l ogic input/output c h g _ s ______________ pull down voltage v chg_s _________________ tbd, ichg_s=5ma -- 65 -- mv pgood pull down voltage vpgood tbd, ipgood=5ma -- 220 -- mv en ______ threshold l ogic - high voltage vih 1.5 -- - - v l ogic - low voltage vil -- -- 0.4 v en ______ pin input current ien ien=2v -- -- 2 a protection t hermal regulation -- 125 -- ovp set internal default -- 6.5 -- v
preliminary datasheet lp280 0 9 lp280 0 9 C 0 2 may . - 20 1 3 email : marketing@lowpowersemi.com www.lowpowersemi.com page 7 of 12 p ara meter s ymbol t est c ondition s m in t yp m ax u nits supply input acin uvp rising threshold voltage vuv_high 4.4 4.5 v acin uvp hysteresis vuv_low 50 80 120 mv acin standby current istby vbatt=4.5v 300 500 a acin shutdown current ishdn ven=high 50 10 0 a acin uvp current iuvp v acin=4v, vusb=4v, vbatt=3v 1 50 250 a batt sleep leakage current isleep vacin=4v, vusb=4v, vbatt=4.5v 2 5 a voltage regulation batt regulation voltage vreg ibatt=60ma 4.158 4.2 4.242 v regulation voltage accuracy - 1 +1 % acin mosfet rds(on)_acin ibatt=500ma 600 m current regulation iseta set voltage (fast charge phase) viseta vbatt=3.5v 2.45 2.5 2.55 v full charge setting range ichg_ac 100 -- 1200 m a acin charge current accuracy ichg_ac vbatt=3.8v riset=1.5k -- 125 --
preliminary datasheet lp280 0 9 lp280 0 9 C 0 2 may . - 20 1 3 email : marketing@lowpowersemi.com www.lowpowersemi.com page 8 of 12 typical operating characteristics
preliminary datasheet lp280 0 9 lp280 0 9 C 0 2 may . - 20 1 3 email : marketing@lowpowersemi.com www.lowpowersemi.com page 9 of 12
preliminary datasheet lp280 0 9 lp280 0 9 C 0 2 may . - 20 1 3 email : marketing@lowpowersemi.com www.lowpowersemi.com page 10 of 12 a pplication information automatically power source selection the LP28009 is a battery charger ic which is designed for li - ion battery with 4.2v rated voltage. acin mode : when the acin input voltage is higher than the uvp voltage level (4.4v), the LP28009 will turn on acinp - mosfet. sleep mode : the LP28009 will enter sleep mode when acin input voltage are removed. this feature provides low leakage curr ent from the battery during the absence of input supply. acin over voltage protection the acin input voltage is monitored by an internal ovp comparator. the comparator has an accurate reference of 2.5v from the band - gap reference. the ovp threshold is set by the internal resistive. the protection threshold is set to 6.5v. when the input voltage exceeds the threshold, the comparator outputs a logic signal to turn off the power p - mosfet to prevent the high input voltage from damaging the electronics in the h andheld system. when the input over v oltage condition is removed (acin < 6v), the comparator re - enables the output by running through the soft - start. fast - charge current setting the LP28009 offers iseta pin to determine the acin charge rate from 100ma to 1.2a. the charge current can be calculated as following equation. pre - charge current setting during a charge cycle if the battery voltage is below the vprech threshold, the LP28009 applies a pre - charge mode to the battery. this feature revives deep ly discharged cell sand protects battery life. the LP28009 internal determines the pre - charge rate as 10% of the fast - charge current. battery voltage regulation the LP28009 monitors the battery voltage through the batt pin. once the battery voltage level closes to the vreg threshold, the LP28009 voltage enters constant phase and the charging current begins to taper down. when battery voltage is over the vreg threshold, the LP28009 will stop charge and keep to monitor the battery voltage. however, when the battery voltage decreases 100mv below the vreg, it will be recharged to keep the battery voltage. charge status outputs . the open - drain chg_s and pgood outputs indicate various charger operations as shown in the followin g table. these status pins can be used to drive leds or communicate to the host processor. note that on indicates the open - drain transistor is turned on and led is bright.
preliminary datasheet lp280 0 9 lp280 0 9 C 0 2 may . - 20 1 3 email : marketing@lowpowersemi.com www.lowpowersemi.com page 11 of 12 temperature regulation and thermal protection in order to maximize the charge rate, the LP28009 features a junction temperature regulation loop. if the power dissipation of the ic results in a junction temperature greater than the thermal regulation threshold (125c), the LP28009 throttles back on the charge current in order to main tain a junction temperature around the thermal regulation threshold (125c). the LP28009 monitors the junction temperature, tj, of the die and disconnects the battery from the input if tj exceeds 125c. this operation continues until junction temperature f alls below thermal regulation threshold (125c) by the hysteresis level. this feature prevents the chip from damage. selecting the input and output capacitors in most applications, the most important is the high - frequency decoupling capacitor on the input of the LP28009 .a 1uf ceramic capacitor, placed in close proximity to input pin and gnd pin is recommended. in some applications depending on the power supply characteristics and cable length, it may be necessary to add an additional 10ufceramic capacitor to the input. the LP28009 requires a small output capacitor for loop stability. a 1uf ceramic capacitor placed between the batt pin and gnd is typically sufficient. layout consideration the LP28009 is a fully integrated low cost single - cell li - ion batte ry charger ideal for portable applications. careful pcb layout is necessary. for best performance, place all peripheral components as close to the ic as possible. a short connection is highly recommended. the following guide lines should be strictly follow ed when designing a pcb layout for the LP28009 .input capacitor should be placed close to ic and connected to ground plane. the trace of input in the pcb should be placed far away the sensitive devices or shielded by the ground. the gnd should be connecte d to a strong ground plane for heat sinking and noise protection. the connection of rseta should be isolated from other noisy traces. the short wire is recommended to prevent emi and noise coupling. output capacitor should be placed close to ic and connec ted to ground plane to reduce noise coupling. when pcb has poor layout, the 10uf is recommended to prevent noise.
preliminary datasheet lp280 0 9 lp280 0 9 C 0 2 may . - 20 1 3 email : marketing@lowpowersemi.com www.lowpowersemi.com page 12 of 12 packag ing information

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