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RT9519B 1 ds9519b-01 april 2011 www.richtek.com ordering information note : richtek products are : ` rohs compliant and compatible with the current require- ments of ipc/jedec j-std-020. ` suitable for use in snpb or pb-free soldering processes. applications z digital cameras z pdas and smart phones z portable instruments pin configurations general description the RT9519B is an integrated single cell li-ion battery charger with auto power path management (appm). no external mosfets are required. the RT9519B enters sleep mode when power is removed. charging tasks are optimized by using a control algorithm to vary the charge rate, including pre-charge mode, fast charge mode and constant voltage mode. for the RT9519B, the charge current can also be programmed with an external resistor and modified with an external gpio. the scope that the battery regulation voltage can be modified with an external gpio depends on the battery temperature. the internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures. the charging task will always be terminated in constant voltage mode when the charging current reduces to the termination current of 10% x i chg_fast . other features include under voltage protection and over voltage protection for vin the supply. linear single cell li-lon battery charger with auto power path management features z z z z z 28v maximum rating for vin power z z z z z selectable power current limit (0.1a / 0.5a / 1.5a) z z z z z integrated power mosfets z z z z z auto power path management (appm) z z z z z battery charging current control z z z z z battery regulation voltage control z z z z z programmable charging current and safe charge timer z z z z z under voltage protection, over voltage protection z z z z z power good and charge status indicator z z z z z optimized charge rate via thermal feedback z z z z z thin 20-lead wqfn package z z z z z rohs compliant and halogen free wqfn-20l 3x3 (top view) marking information gnd vin vset vp isetu ts timer bat usus sys sys sys ts_fault iseta iset bat pgood chg en 14 15 13 12 17 18 19 20 1 2 3 4 9 8 7 6 gnd 21 11 5 16 10 isetl 46=ym dnn 46= : product code ymdnn : date code RT9519B package type qw : wqfn-20l 3x3 (w-type) lead plating system g : green (halogen free and pb free)
RT9519B 2 ds9519b-01 april 2011 www.richtek.com function block diagram typical application circuit cc/cv/tr /appm multi loop controller logic control sleep mode current setting vin iseta bat control circuit sys 200k 200k 200k iset vset en thermal circuit vp 200k 200k usus 200k isetu isetl gnd chg pgood timer temperature sense timer ts 1sec delay ovp uvlo r ts_fault vin gnd RT9519B sys 5 4, 21 (exposed pad) 12 1 17, 18, 19 vp iseta c in adapter 10 usus 20 r iseta 2.2f en chip enable vset 15 14 2 3 timer 7 c timer 1f ntc 6 ts to system load suspend normal suspend mode pgood chg power good indicator charge indicator 8, 9 bat + 1f 1-cell li+ 4.2v 4.05v isetl 13 isetu vin current limit 500ma 100ma 11 iset i chg i chg /2 2.95v to 3.6v external power source 16 vin current limit ts_fault indicator ts_fault see isetu 1.5a c vp r1 c bat r2 r3 r4 c sys
RT9519B 3 ds9519b-01 april 2011 www.richtek.com functional pin description pin no. pin name pin function 1 vin supply voltage input. 2 pgood power good status output. open-drain output. 3 chg charger status output. open-drain output. 4, 21 (exposed pad) gn d ground. the exposed pad must be soldered to a large pc b and connect ed to gnd for maximum power dissipation. 5 iseta charge current set input. connect a resistor (r iseta ) between iseta and gnd. 6 ts temperat ure sense input. the ts pin connects to a battery?s thermistor to determine if the battery is too hot or too cold to charge. if the battery?s temperature is out of range, charging is paused until it re-enters the valid range. ts also detects whether the battery (with ntc) is present or not. 7 timer safe charge timer setting. 8,9 bat battery charge current output. 10 en charge enable. active low input. 200k pull low. 11 ise t half charge current set input. control by external gpio, l = i chg1 / 2, h = i ch g1 , 200k pull low. 12 vp this pin must be provided a regulated volt age from 2.95v to 3.6v by external power. 13 isetu vin current limit control input. when isetl = l, l = 100ma, h = 500ma, 200k pu ll lo w. 14 isetl vin current limit cont rol i nput. l : see isetu, h = 1.5a, 200k pull low. 15 vset battery regulation set input. control by ext ernal gpio. l = 4.05v, h = 4.2v, 200k pull low. 16 ts_fault ts fault status output . open-drain out put. if ts is of f ault (too cold, t oo hot) or vp triggers uvlo, ts_fault = l. if ts and vp are normal, ts_fault = h. 17, 18, 19 sys system connect pin. connect this pin to system wit h a minimum 10 f ce ramic capacitor to gnd. 20 usus vin suspend cont rol input. h = suspend, l = n o suspend. 200k pull low.
RT9519B 4 ds9519b-01 april 2011 www.richtek.com absolute maximum ratings (note 1) z supply voltage, v in ----------------------------------------------------------------------------------------------------- ? 0.3v to 28v z chg, pgood ------------------------------------------------------------------------------------------------------------ ? 0.3v to 28v z other pins ----------------------------------------------------------------------------------------------------------------- ? 0.3v to 6v z chg, pgood continuous current ---------------------------------------------------------------------------------- 20ma z bat continuous current (total in two pins) (note 2) ----------------------------------------------------------- 2.5a z power dissipation, p d @ t a = 25 c wqfn-20l 3x3 ----------------------------------------------------------------------------------------------------------- 1.471w z package thermal resistance (note 3) wqfn-20l 3x3, ja ----------------------------------------------------------------------------------------------------- 68 c/w wqfn-20l 3x3, jc ------------------------------------------------------------------------------------------------------------------------------- ----------------- 7.5 c/w z lead temperature (soldering, 10 sec.) ----------------------------------------------------------------------------- 260 c z junction temperature --------------------------------------------------------------------------------------------------- 150 c z storage temperature range ------------------------------------------------------------------------------------------- ? 65 c to 150 c z esd susceptibility (note 4) hbm (human body mode) --------------------------------------------------------------------------------------------- 2kv mm (machine mode) ---------------------------------------------------------------------------------------------------- 200v recommended operating conditions (note 5) z supply input voltage range,v in (isetl = h) ---------------------------------------------------------------------- 4.4v to 6v z supply input voltage range,v in (isetl = l) ---------------------------------------------------------------------- 4.5v to 6v z junction temperature range ------------------------------------------------------------------------------------------ ? 40 c to 125 c z ambient temperature range ------------------------------------------------------------------------------------------ ? 40 c to 85 c electrical characteristics (v in = 5v, v bat = 4v, t a = 25 c, unless otherwise specified) to be continued parameter symbol test conditions min typ max unit supply input vin under voltage lockout threshold v uvlo v in = 0v to 4v 3.1 3.3 3.5 v vin under voltage lockout hysteresis v uvlo v in = 4v to 0v -- 240 -- mv i sys = i bat = 0ma, en = l (v bat > v regx ) -- 1 2 vin supply current i supply i sys = i bat = 0ma, en = h (v bat > v regx ) -- 0.8 1.5 ma vin suspend current i usus v in = 5v, usus = h -- 195 300 a vbat sleep leakage current i sleep v bat > v in , (v in = 0v) -- 5 15 a vin-bat vos rising v os_h -- 200 300 mv vin-bat vos falling v os_l 10 50 -- mv voltage regulation system regulation voltage v sys i sys = 800ma 4.3 4.4 4.5 v battery regulation voltage v reg1 0 to 85 c , loading = 20ma, when vset = h 4.16 4.2 4.23 v battery regulation voltage v reg2 0 to 85 c, loading = 20ma, when vset = l 4.01 4.05 4.08 v appm regulation voltage v appm v sys ? v appm 120 200 280 mv
RT9519B 5 ds9519b-01 april 2011 www.richtek.com parameter symbol test conditions min typ max unit dpm regulation voltage v dpm isetl = l 4.3 4.4 4.5 v vin to vsys mosfet ron r ds(on) i vin = 1000ma -- 0.2 0.35 bat to vsys mosfet ron r ds(on) v bat = 4.2v, i sys = 1a -- 0.05 0.1 re-charge threshold v re gchg battery regulation ? recharge level 60 100 140 mv current regulation iseta set voltage (fast charge phase) v iseta v bat = 4v, r iseta = 1 k -- 2 -- v charge current setting range i chg 100 -- 1200 ma charge current accuracy1 i chg1 v bat = 4v, r iseta = 1 k iset = h 570 600 630 ma charge current accuracy2 i chg2 v bat = 3.8v, r iseta = 1k iset = l 285 300 315 ma isetl = h (1.5a mode) 1.2 1.5 1.8 a isetl = l, isetu = h (500ma mode) 450 475 500 ma vin current limit i vin isetl = l, isetu = l (100ma mode) 90 95 100 ma pre-charge bat pre-charge threshold v prech bat falling 2.7 2.8 2.9 v bat pre-charge threshold hysteresis vprech -- 200 -- mv pre-charge current i chg_pre v bat = 2v 5 10 15 % charge termination detection termination current ratio to fast charge (except usb 100 mode) i term isetl = l, isetu = h isetl = h, isetu = x 5 10 15 % termination current ratio to fast charge (usb100 mode) i term2 isetl = l, isetu = l -- 3.3 -- % login input/output chg pull down voltage v chg i chg = 5ma -- 200 -- mv pgood pull down voltage v pgood i pgood = 5ma -- 200 -- mv ts_fault pull down voltage v ts_fault i ts _fault = 5ma -- 200 -- mv logic-high v ih 1.5 -- -- en, isetl, usus, isetu, vset, iset threshold voltage logic-low v il -- -- 0.4 v protection thermal regulation t reg -- 125 -- c thermal shutdown temperature t sd -- 155 -- c thermal shutdown hysteresis t sd -- 20 -- c over voltage protection v ovp v in rising 6.25 6.5 6.75 v over voltage protection hysteresis v ovp v in = 7v to 5v, v ovp ? v ovp -- 100 -- mv output short circuit detection threshold v short v bat ? v sys -- 300 -- mv to be continued
RT9519B 6 ds9519b-01 april 2011 www.richtek.com param eter symbol test conditions min typ max unit tim e pre-charge fault time t pchg c timer = 1 f (1/8 x t fchg ) 1440 1800 2160 s fast charge fault time t fc hg c timer = 1 f 11520 14400 17280 s pgood deglitch time t pgood time measured f rom vin : 0 ? 5v 1 s rise-time to pgood = l -- 1 -- s input over voltage blanking time t ovp -- 50 -- s pre-charge to fast-charge deglitch time t pf -- 25 -- ms fast-charge to pre-charge deglitch time t fp -- 25 -- ms te rm in atio n deg litch tim e t ter mi -- 25 -- ms recharge deglitch time t rechg -- 100 -- ms input power loss to sys ldo tu rn -off dela y ti me t no_in -- 25 -- ms pack temperature fault detection deglitch time t ts -- 25 -- ms short c ircuit d eglitch time t short -- 250 -- s short c ircuit r ecovery time t short-r -- 64 -- ms other vp (ext ernal used only) v vp 2.95 -- 3.6 v vp u nder voltage lockout threshold falling threshold -- 0.8 -- v ts battery detect threshold v ts 2.75 2.85 2.95 v ntc low temperature trip point v cold rising threshold 73 74 75 % of vp low temperature trip point hysteresis v cold -- 1 -- % of vp high temperature trip point v hot falling threshold 27 28 29 % of vp high temperature trip point hysteresis v hot -- 1 -- % of vp note 1. stresses listed as the above " absolute maximum ratings " may cause permanent damage to the device. these are for stress ratings. functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. note 2. guraranteed by design. note 3. ja is measured in natural convection at t a = 25 c on a high effective thermal conductivity four-layer test board of jedec 51-7 thermal measurement standard. the measurement case position of jc is on the exposed pad of the package. note 4. devices are esd sensitive. handling precaution is recommended. note 5. the device is not guaranteed to function outside its operating conditions.
RT9519B 7 ds9519b-01 april 2011 www.richtek.com typical operating characteristics charger on/off control from v in time (500ms/div) v in = 5v, v bat = real battery, v vp = 3.3v v in (5v/div) i bat (500ma/div) v bat (5v/div) usb 500ma mode v chg (5v/div) ts inserted/removed time (25ms/div) v in = 5v, v bat = real battery, v vp = 3.3v v bat (5v/div) i bat (500ma/div) v ts (5v/div) usb 500ma mode v chg (5v/div) charger on/off control from en time (25ms/div) v in = 5v, v bat = real battery, v vp = 3.3v v en (5v/div) i bat (500ma/div) v bat (5v/div) usb 500ma mode v chg (5v/div) v in hot-plug without nvc/battery time (100ms/div) v in = 5v, v vp = 3.3v, r sys = 10 , isetl = h v sys (5v/div) v bat (10v/div) i in (500ma/div) v in (10v/div) v in hot-plug with ntc/without battery time (100ms/div) v in = 5v, v vp = 3.3v, r sys = 10 , isetl = h v sys (5v/div) v bat (10v/div) i in (500ma/div) v in (10v/div) time (10ms/div) v in = 5v, v bat = real battery, v vp = 3.3v, r sys = 10 , isetl = h v in removal i bat (1a/div) v sys (5v/div) v in (10v/div) v bat (10v/div)
RT9519B 8 ds9519b-01 april 2011 www.richtek.com v in - v sys dropout voltage vs. temperature 230 255 280 305 330 355 380 405 430 455 480 -50 -25 0 25 50 75 100 125 temperature (c) v in - v sys dropout voltage (mv) v in = 5v, v vp = 3.3v, i sys = 1a system regulation voltage vs. temperature 4.30 4.32 4.34 4.36 4.38 4.40 4.42 4.44 4.46 4.48 4.50 -50 -25 0 25 50 75 100 125 temperature (c) system regulation voltage (v) 1 v in = 5v, v vp = 3.3v, i sys = 0.5a v bat - v sys dropout voltage vs. temperature 55 60 65 70 75 80 85 90 95 100 105 110 115 120 -50 -25 0 25 50 75 100 125 temperature (c) v bat - v sys dropout voltage (mv) v bat = 3.7v, v vp = 3.3v, i sys = 1a, usus = h v in hot-plug with battery time (100ms/div) v in = 5v, v vp = 3.3v, v bat = real battery, r sys = 10 , isetl = h v sys (5v/div) v bat (10v/div) i bat (1a/div) v in (10v/div) v in over voltage protection time (500ms/div) v in (10v/div) v sys (10v/div) i bat (1a/div) v bat (10v/div) v in = 5v to 15v, v bat = real battery, r sys = 10 , isetl = h ovp threshold voltage vs. temperature 6.32 6.34 6.36 6.38 6.40 6.42 6.44 6.46 6.48 6.50 6.52 -50 -25 0 25 50 75 100 125 temperature (c) ovp threshold voltage (v) v in = 5v, v bat = 3.7v, v vp = 3.3v rising faling
RT9519B 9 ds9519b-01 april 2011 www.richtek.com fastcharge current vs. battery voltage 400 450 500 550 600 650 700 750 800 3 3.2 3.4 3.6 3.8 4 4.2 battery voltage (v) fastcharge current (ma) 1 v in = 5v, v vp = 3.3v, r iseta = 1k , isetl = h precharge current vs. battery voltage 0 20 40 60 80 100 120 140 2 2.2 2.4 2.6 2.8 3 battery voltage (v) precharge current (ma ) v in = 5v, v vp = 3.3v, r iseta = 0.6k , isetl = h i chg thermal regulation vs. temperature 0 50 100 150 200 250 300 350 400 450 500 -50-25 0 25 50 75100125 temperature (c) i chg thermal regulation (ma) 1 v in = 5v, v bat = 3.7v, v vp = 3.3v battery regulation voltage vs. temperature 4.10 4.12 4.14 4.16 4.18 4.20 4.22 4.24 4.26 4.28 4.30 -50 -25 0 25 50 75 100 125 temperature (c) battery regulation voltage (v) 1 v in = 5v, v vp = 3.3v
RT9519B 10 ds9519b-01 april 2011 www.richtek.com applications information the RT9519B is a fully integrated single-cell li-ion battery charger ideal for portable applications. the internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures. other features include under voltage protection and over voltage protection. pre-charge mode when the output voltage is lower than 2.8v, the charging current will be reduce to a fast-charge current ratio set by r iseta to protect the battery life time. fast-charge mode when the output voltage is higher than 3v, the charging current will be equal to the fast-charge current set by r iseta . constant voltage mode when the output voltage is near 4.2v, and the charging current fall below the termination current, after a deglitch time check of 25ms, the charger will become disabled and chg will go from l to h. re-charge mode when the chip is in charge termination mode, the charging current will gradually go down to zero. however, once the voltage of the battery drops to below 4.1v, there will be a deglitch time of 100ms and then the charging current will resume again. charging current decision the charge current can be set according to the following equations : set chg1 iseta chg_fast iseta set chg2 iseta chg_fast iseta chg_pre chg_fast if i = h (for i ) v i = 300 r if i = l (for i ) v i = 150 r i = 10% i time fault during the fast charge phase, several events may increase the charging time. input state pgood output v in < v uvlo high impedance v uvlo < v in < v bat + v os _h high impedance v bat + v os_h < v in < v ovp low impedance v in > v ovp high impedance for example the system load current may have activated the appm loop which reduces the available charging current. the device has entered thermal regulation because the ic junction temperature has exceeded t reg . during each of these events, if 3v < v bat < 4.1v, the internal charging time is slowed down proportionately to the reduction in charging current. however, once the duration exceed the fault time, the chg output will flash at approximately 2hz to indicate a fault condition and the charge current will be reduced to about 1ma. time fault release methods : (1) re-plug power (2) toggle en (3) enter/exit suspend mode (4) remove battery (5) ovp if iset = h (for i chg1 ) timer = t fchg if iset = l (for i chg2 ) timer = 2 x t fchg fchg_true fchg iseta fchg_true fchg timer fchg fchg pchg pchg 2v t = t v t : modified timer in fast t : original timer in fast charger c t = 14400 sec ( ) 1f t t = 8 t : timer in pre-charge power good vin power good ( pgood = l)
RT9519B 11 ds9519b-01 april 2011 www.richtek.com charge state indicator charge state chg output charging charging suspended by thermal loop low (f or first charge cycle) safety timers expired 2hz flash charging done recharging after termination ic disabled or no valid input power high impedance figure 1 battery pack temperature monitoring the battery pack temperature monitoring function can be realized by connecting the ts pin to an external negative temperature coefficient (ntc) thermistor to prevent over temperature condition. charging is suspended when the voltage at the ts pin is out of normal operating range. the internal timer is then paused, but the value is maintained. when the ts pin voltage returns back to normal operating range, charging will resume and the safe charge timer will continue to count down from the point where it was suspended. note that although charging is suspended due to the battery pack temperature fault, the chg pin will continue to remain low and indicate charging. too cold temperature r cold = r ntc too hot temperature r hot = r ntc cold cold hot hot r2 + r = 0.74 r + r1 + r2 r2 + r = 0.28 r + r1 +r2 (2) (1) (3) ? ? cold hot hot cold cold from (1), (2) r r r1 = 2.457 r2 = 0.389 r1 r if r2 < 0 r = 0.74 r + r1 charge enable when en is low, the charger turns on. when en is high, the charger turns off. en is pulled low for initial condition. vin input current limit isetl isetu vin input current limit l l 95ma l h 475ma h x 1.5a ? cold cold from (3) r r1 = r 0.74 suspend mode set usus = h, and the charge will enter suspend mode. in the suspend mode, chg is in high impedance and i usus(max) < 300 a. power switch for the RT9519B, there are three power scenarios: (1)when a battery and an external power supply (usb or adapter) are connected simultaneously : if the system load requirements exceed that of the input current limit, the battery will be used to supplement the current to the load. however, if the system load requirements are less than that of the input current limit, the excess power from the external power supply will be used to charge the battery. (2)when only the battery is connected to the system : the battery provides the power to the system. (3)when only an external power supply is connected to the system : + - + - 0.74 x vp too cold too hot ts r2 r ntc 0.28 x vp vp vp r1
RT9519B 12 ds9519b-01 april 2011 www.richtek.com charging profile figure 2 the external power supply provides the power to the system. input dpm mode for the RT9519B, the input voltage is monitored when the usb100 or usb500 is selected. if the input voltage is lower than v dpm , the input current limit will be reduced to stop the input voltage from dropping any further. this can prevent the ic from damaging improperly configured or inadequately designed usb sources. appm mode once the sum of the charging and system load currents becomes higher than the maximum input current limit, the sys pin voltage will be reduced. when the sys pin voltage is reduced to the v appm , the RT9519B will automatically operate in appm mode. in this mode, the charging current is reduced while the sys current is increased to maintain system output. in appm mode, the battery termination function is disabled. battery supplement mode short circuit protect in appm mode, the sys voltage will continue to drop if the charge current is zero and the system load increases beyond the input current limit. when the sys voltage decreases below the battery voltage, the battery will kick in to supplement the system load until the sys voltage rises above the battery voltage. while in supplement mode, there is no battery supplement current regulation. however, a built in short circuit protection feature is available to prevent any abnormal current situations. while the battery is supplementing the load, if the difference between the battery and sys voltage becomes more than the short circuit threshold voltage, sys will be disabled. after a short circuit recovery time, t short_r , the counter will be restarted. in supplement mode, the battery termination function is disabled. note that for the battery supply mode exit condition, v bat ? v sys < 0v. thermal regulation and thermal shutdown the RT9519B provides a thermal regulation loop function to monitor the device temperature. if the die temperature rises above the regulation temperature, t reg , the charge current will automatically be reduced to lower the die temperature. however, in certain circumstances (such as high vin, heavy system load, etc.) even with the thermal loop in place, the die temperature may still continue to increase. in this case, if the temperature rises above the thermal shutdown threshold, t sd , the internal switch between vin and sys will be turned off. the switch between the battery and sys will remain on, however, to allow continuous battery power to the load. once the die temperature decreases by t sd , the internal switch between vin and sys will be turned on again and the device returns to normal thermal regulation. time battery voltage charging current i chg_pre = 10% x i chg_fast v prech i term v rech 4.16 to 4.2 to 4.23v -40 to 85 c i term2 isetl = l, isetu = h isetl = h, isetu = x i termi = 10% x i chg_fast if if isetl = l, isetu = l i termi = 3.3% x i chg_fast
RT9519B 13 ds9519b-01 april 2011 www.richtek.com appm profile 1.5a mode : 1a 0 -1a 2a 3a -2a -3a 5v 4.4v 4.2v 4.0v i bat i sys i vin t1 t2 t3 t4 t5 t6 t7 v bat v in v sys v appm i sy s v sys i vin i bat t1, t7 0 sys regulation voltage chg_max chg_max t2, t6 < i vin_oc ? chg_max sys regulation voltage i sys + chg_max chg_max t3, t5 > i vin _oc ? chg_max < i vin_ocs auto charge voltage threshold v in _oc v in_oc ? i sys t4 > i vin_oc v bat ? i bat x r ds(on) v in _oc i sys ? i vi n_oc 0.25a 0 -0.25a 0.5a 0.75a -0.5a -0.75a 5v 4.2v 4.0v i bat i sys i usb t1 t2 t3 t4 t5 t6 t7 v bat v usb v sys v appm 4.4v i sys v sys i usb i bat t1, t7 0 sys regulation voltage chg_max chg_max t2, t6 < i vin_oc (usb) ? chg_max sys regulation voltage i sys + chg_max chg_max t3, t5 > i vin_oc (usb) ? chg_max < i vin_oc (usb) auto charge voltage threshold i vin_oc (usb) i vin_oc (us b) ? i sys t4 > i vi n_oc (usb) v bat ? i bat x r ds(on) i vin_oc (usb) i sys ? i vi n_oc (usb) usb 500ma mode :
RT9519B 14 ds9519b-01 april 2011 www.richtek.com vset vs v reg , iset vs i chg 4.16 to 4.2 to 4.23v 4.01 to 4.05 to 4.08v i chg +/-5% 0.5 x i chg +/-5% vset iset v reg i chg for jeita battery temperature standard : cv regulation voltage will change at the following battery temp ranges 0c to 10c and 45c to 60c cc regulation current will change at the following battery temp ranges 0c to 10c and 45c to 60c 0c 10c 45c 60c temperature +/- 2c 4.16 to 4.2 to 4.23v 4.01 to 4.05 to 4.08v i chg +/- 5% 0.5 x i chg +/- 5% 0.5 x i chg +/- 5% temperature +/- 2c 4.01 to 4.05 to 4.08v
RT9519B 15 ds9519b-01 april 2011 www.richtek.com RT9519B operation state digram for charging operation state digram for ts pin any state or v in < v uvlo , or v in > v ovp , or v in - v bat < v os_h or usus = h or en = h charger disable standby state sleep state v in C v bat > v os_h v bat > 3v pre-charge state i chg_pre = 10% x i chg_fast time > t pchg fast-charge state if iset = h i chg_fast = (v iseta / r iseta ) x 300 if iset = l i chg_fast = (v iseta / r iseta ) x 150 if vset = h check v bat > 4.1v if vset = l check v bat > 3.95v time > t termi = 25msec charge done state chg = high impedance & i chg = 0a if vset = h check v bat < 4.1v if vset = l check v bat < 3.95v re-charge state chg = high impedance timer-out state chg = flash 2hz & i chg to 1ma time > t fchg v uvlo < v in < v ovp & en = l &usus = l no yes yes no yes no yes no yes yes no yes yes no yes no isetl = l & isetu = h isetl = h & isetu = x check i chg < 10% x i chg_fast if isetl = l & isetu = l check i chg < 3.3% x i chg_fast if any state 74% x v vp < v ts < 2.85v or vts < 28% x v vp no yes ts fault state i chg = 0a keep chg state v ts > 2.85v no yes battery remove state i chg = 0a chg = high impedance reset timer and chg
RT9519B 16 ds9519b-01 april 2011 www.richtek.com thermal considerations for continuous operation, do not exceed absolute maximum junction temperature. the maximum power dissipation depends on the thermal resistance of the ic package, pcb layout, rate of surrounding airflow, and difference between junction and ambient temperature. the maximum power dissipation can be calculated by the following formula : p d(max) = (t j(max) ? t a ) / ja where t j(max) is the maximum junction temperature, t a is the ambient temperature, and ja is the junction to ambient thermal resistance. for recommended operating condition specifications of the RT9519B, the maximum junction temperature is 125 c and t a is the ambient temperature. the junction to ambient thermal resistance, ja , is layout dependent. for wqfn- 20l 3x3 packages, the thermal resistance, ja , is 68 c/ w on a standard jedec 51-7 four-layer thermal test board. the maximum power dissipation at t a = 25 c can be calculated by the following formula : p d(max) = (125 c ? 25 c) / (68 c/w) = 1.471w for wqfn-20l 3x3 package the maximum power dissipation depends on the operating ambient temperature for fixed t j(max) and thermal resistance, ja . for the RT9519B package, the derating curve in figure 3 allows the designer to see the effect of rising ambient temperature on the maximum power dissipation. figure 3. derating curves for RT9519B package 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0 25 50 75 100 125 ambient temperature (c) maximum power dissipation (w) 1 four-layer pcb layout considerations the RT9519B is a fully integrated low cost single cell li- ion battery 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 guidelines should be strictly followed when designing a pcb layout for the RT9519B. ` input and output capacitor should be placed close to the ic and connected to ground plane. the input trace on the pcb should be placed far away from sensitive devices and shielded by the ground. ` the gnd and exposed pad should be connected to a strong ground plane for heat sinking and noise protection. ` the connection of riseta should be isolated from other noisy traces. a short wire is recommended to prevent emi and noise coupling.
RT9519B 17 ds9519b-01 april 2011 www.richtek.com figure 4. pcb layout guide gnd vin vset vp isetu ts timer bat usus sys sys sys ts_fault iseta iset bat pgood chg en 14 15 13 12 17 18 19 20 1 2 3 4 9 8 7 6 gnd 21 11 5 16 10 isetl gnd c sys r4 c in r1 c vp gnd ts c bat c timer gnd sys r2 r3 gnd r iseta connect the exposed pad to a ground plane. the r iseta connection copper area should be minimized and kept far away from noise sources. place c in near the ic to improve performance. gnd should be connected to a strong ground plane for heat sinking and noise protection. ntc
RT9519B ds9519b-01 april 2011 www.richtek.com richtek technology corporation headquarter 5f, no. 20, taiyuen street, chupei city hsinchu, taiwan, r.o.c. tel: (8863)5526789 fax: (8863)5526611 information that is provided by richtek technology corporation is believed to be accurate and reliable. richtek reserves the ri ght to make any change in circuit design, specification or other related things if necessary without notice at any time. no third party intellectual property inf ringement of the applications should be guaranteed by users when integrating richtek products into any application. no legal re sponsibility for any said applications i s assumed by richtek. 18 richtek technology corporation taipei office (marketing) 5f, no. 95, minchiuan road, hsintien city taipei county, taiwan, r.o.c. tel: (8862)86672399 fax: (8862)86672377 email: marketing@richtek.com outline dimension dimensions in millimeters dimensions in inches symbol min max min max a 0.700 0.800 0.028 0.031 a1 0.000 0.050 0.000 0.002 a3 0.175 0.250 0.007 0.010 b 0.150 0.250 0.006 0.010 d 2.900 3.100 0.114 0.122 d2 1.650 1.750 0.065 0.069 e 2.900 3.100 0.114 0.122 e2 1.650 1.750 0.065 0.069 e 0.400 0.016 l 0.350 0.450 0.014 0.018 w-type 20l qfn 3x3 package note : the configuration of the pin #1 identifier is optional, but must be located within the zone indicated. det ail a pin #1 id and tie bar mark options 1 1 2 2

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