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RT9515 1 ds9515-01 april 2011 www.richtek.com features z z z z z 18v maximum rating for ac adapter z z z z z internal integrated p-mosfets z z z z z ac adapter power good status indicator z z z z z charge status indicator z z z z z under voltage protection z z z z z over voltage protection z z z z z automatic recharge feature z z z z z battery temperature monitoring z z z z z small 10-lead wdfn package z z z z z thermal feedback optimizing charge rate z z z z z rohs compliant and halogen free pin configurations applications z digital cameras z cellular phones z personal data assistants (pdas) z mp3 players z handheld pcs ordering information general description the RT9515 is a fully integrated low cost single-cell li- ion battery charger ic ideal for portable applications. the RT9515 is capable of being powered up from ac adapter. the RT9515 enters sleep mode when ac adapter is removed. the RT9515 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 1a with an external resister. the internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures. the RT9515 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. (top view) wdfn-10l 3x3 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. marking information for marking information, contact our sales representative directly or through a richtek distributor located in your area. acin nc gnd batt ts iseta nc 9 8 7 9 1 2 3 4 5 10 gnd chg_s pgood en 11 linear single cell li-ion battery charger ic RT9515 package type qw : wdfn-10l 3x3 (w-type) lead plating system g : green (halogen free and pb free)
RT9515 2 ds9515-01 april 2011 www.richtek.com functional pin description pin no. pin name pin function 1 acin wall adaptor charge input supply. 2, 7 nc no internal connection. 3 chg_s charge status indicator output (open drain). 4 pgood power good indicator output (open drain). 5 gnd ground. 6 iseta wall adaptor supply charge current set point. 8 en charge enable input (active low). 9 ts temperature sense input. 10 batt battery charge current output. 11 (exposed pad) gnd exposed pad should be soldered to pcb board and connected to gnd. typical application circuit pre-charge phase fast charge phase constant voltage phase & standby phase re-charge phase programmed charge current 4.1v recharge threshold 2.8v precharge threshold 1/10 programmed charge current charge complete battery voltage charging current RT9515 1uf ac adapter acin gnd batt ts iseta + r set battery pack 1 3 4 5, exposed pad (11) 6 8 9 10 chg_s pgood en to system to system chip shutdown chip enable 0.1uf to 10uf
RT9515 3 ds9515-01 april 2011 www.richtek.com function block diagram ovp + - 2.5v charge input control precharge + - 2.5v recharge + - 2.5v v ref 2.5v 0.25v 0.5v + - charge done 0.25v logic temperature sense temperature fault + - charge disable 0.9v 1ua ovp comparator precharge comparator recharge comparator acin gnd iseta ts batt acin pfet sense fet tcrmination comparator vcc chg_s pgood en loop controller v ref 125 c
RT9515 4 ds9515-01 april 2011 www.richtek.com any state if v in < uvlo or v in > ovp or en = high or v in < batt v ts > 2.5v or v ts < 0.5v power off state pfet = off no batt > 2.8v yes pre-chg state i pchg = 0.1 x i chg_f fast-chg state i chg_f = 500ma @r set = 1.5k charge done state ichg = 0a no yes yes operation state diagram for charger function (RT9515) yes batt < 4.1v no no uvlo batt ichg < 0.1 x i chg_f
RT9515 5 ds9515-01 april 2011 www.richtek.com absolute maximum ratings (note 1) z acin input voltage -------------------------------------------------------------------------------------------------------- ? 0.3v to 18v z en input voltage ----------------------------------------------------------------------------------------------------------- ? 0.3v to 6v z output current ------------------------------------------------------------------------------------------------------------- 1.2a z power dissipation, p d @ t a = 25 c wdfn-10l 3x3 ------------------------------------------------------------------------------------------------------------- 1.667w z package thermal resistance (note 2) wdfn-10l 3x3, ja ------------------------------------------------------------------------------------------------------- 60 c/w wdfn-10l 3x3, jc ------------------------------------------------------------------------------------------------------- 8.2 c/w z lead temperature (soldering, 10 sec.) ------------------------------------------------------------------------------- 260 c z junction te mperature ---------------------------------------------------------------------------------------------------- 150 c z storage temperature range -------------------------------------------------------------------------------------------- ? 65 c to 150 c z esd susceptibility (note 3) hbm (human body mode) ---------------------------------------------------------------------------------------------- 2kv mm (ma chine mode) ------------------------------------------------------------------------------------------------------ 200v electrical characteristics (acin = 5v, t a = 25 c, unless otherwise specification) to be continued parameter symbol test conditions min typ max units supply input acin u vlo threshold voltage v uvlo rising -- 3 3.5 v acin u vlo h ysteresis v uvlo_hys 50 80 120 mv acin standby current i stby v batt = 4.5v -- 300 500 ua acin shutdown current i shdn v en = high -- 50 100 ua acin quiescent current i q v acin = 4v, v usb = 4v, v batt = 3v -- 150 250 ua bat t sleep leakage current i sleep v acin = 4v, v usb = 4v, v batt = 4.5v -- 2 5 ua voltage regulation bat t r egulation voltage v reg i batt = 60ma 4.168 4.21 4.252 v r egulation voltage accuracy ? 1 -- +1 % acin mosfet r ds(on)_acin i batt = 500ma -- 600 -- m current regulation i seta set volta ge ( fast char g e phase ) v iseta v batt = 3.5v 2.45 2.5 2.55 v full charge setting range i chg_f 100 -- 1200 ma acin c harge current accuracy i chg_f v batt = 3 .8v, r ise t = 1. 5k -- 500 -- ma recommended operating conditions (note 4) z acin input voltage range ----------------------------------------------------------------------------------------------- 4.5v to 6v z junction temperature range -------------------------------------------------------------------------------------------- ? 40 c to 125 c z ambient temperature range -------------------------------------------------------------------------------------------- ? 40 c to 85 c
RT9515 6 ds9515-01 april 2011 www.richtek.com 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. ja is measured in the natural convection at t a = 25 c on a high effective thermal conductivity test board (4 layers, 2s2p) of jedec 51-7 thermal measurement standard. the case point of jc is on the expose pad for the package. note 3. devices are esd sensitive. handling precaution is recommended. note 4. the device is not guaranteed to function outside its operating conditions. parameter symbol test conditions min typ max units precharge batt pre-charge rising threshold v prech 2.6 2.8 3 v batt pre-charge threshold hysteresis v pre ch 50 100 200 mv pre-charge current i pchg v batt = 2v 8 10 12 % recharge threshold batt re-charge falling threshold h y steresis v rec h _l v reg ? v batt 60 100 170 mv charge termination detection iseta c harge termination set volta g e v te rm v batt = 4.2v 225 250 275 mv termination c urrent r atio (default) i ter m v batt = 4. 2v -- 10 -- % logic input/output chg_s pull down voltage v ch g_s tbd, i chg_s = 5 ma -- 65 -- mv pgood pu ll dow n voltage v pgood tbd, i p good = 5ma -- 220 -- mv en t hreshold logic-high voltage v ih 1.5 -- -- v logic-low voltage v il -- -- 0.4 v en pin input current i en v en = 2v -- -- 2 ua battery temperature sense ts pin source current i ts v ts = 1.5v 96 102 108 ua ts pin threshold low voltage v ts _low falling 0.485 0.5 0.515 v high voltage v ts _high r ising 2.45 2.5 2.55 v protec tion thermal r egulation -- 125 -- c ovp set internal default -- 6.5 -- v
RT9515 7 ds9515-01 april 2011 www.richtek.com typical operating characteristics i chg_s (1a/div) acin power off time (250us/div) v acin (5v/div) v chg_s (2v/div) v batt (5v/div) v batt = 3.7v v chg_s (2v/div) i chg_s (1a/div) acin power on time (250us/div) v acin (5v/div) v batt (5v/div) v batt = 3.7v acin ovp time (1ms/div) v acin (10v/div) v acin = 5v to 8v to 5v, v batt = 3.7v v batt (5v/div) i chg_s (1a/div) v chg_s (5v/div) acin ovp time (1ms/div) v acin (10v/div) v acin = 0v to 10v, v batt = 3.7v v batt (5v/div) i chg_s (1a/div) v chg_s (5v/div)
RT9515 8 ds9515-01 april 2011 www.richtek.com application information automatically power source selection the RT9515 is a battery charger ic which is designed for li-ion battery with 4.21v rated voltage. acin mode : when the acin input voltage is higher than the uvp voltage level (3v) and lower than ovp voltage level (6.5v), the RT9515 will turn on acin p-mosfet. sleep mode : the RT9515 will enter sleep mode when acin input voltage are removed. this feature provides low leakage current 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 handheld system. when the input over oltage condition is removed (acin < 6v), the comparator re-enables the output by running through the soft-start. battery temperature monitoring the RT9515 continuously monitors battery temperature by measuring the voltage between the ts and gnd pins. the RT9515 has an internal current source to provide the bias for the most common 10k negative-temperature coefficient thermal resistor (ntc) (see figure 1). the RT9515 compares the voltage on the ts pin against the internal vts_high and vts_low thresholds to determine if charging is allowed. when the temperature outside the vts_high and vts_low thresholds is detected, the device will immediately stop the charge. the RT9515 stops charge and keep monitoring the battery temperature when the temperature sense input voltage is back to the threshold between vts_high and vts_low, the charger will be resumed. charge is resumed when the temperature returns to the normal range. however, the user may modify thresholds by the negative-temperature coefficient thermal ts ts ntc ts ts v = i r turn off when v 2.5v or v 0.5v ? figure 1. temperature sensing configuration + 0.1uf to 10uf battery a ts temperature sense i ts v batt ntc resistor or adding two external resistors. (see figure 2.) the capacitor should be placed close to ts(pin 9) and connected to the ground plane. the capacitance value (0.1uf to 10uf) should be selected according to the quality of pcb layout. it is recommended to use 10uf if the layout is poor to prevent noise. figure 2. temperature sensing circuit t2 t1 ntc ts ts t1 t2 ntc ts ts r(r + r) v = i r + r + r turn off when v 2.5v or v 0.5v ? + r t2 battery a ts temperature sense i ts v batt ntc r t1 0.1uf to 10uf iseta chg_f set v i = k r fast-charge current setting the RT9515 offers iseta pin to determine the acin charge current from 100ma to 1.2a. the charge current can be calculated as following equation.
RT9515 9 ds9515-01 april 2011 www.richtek.com charge state chg_s pgood acin ch arge on on charge done off on the parameter k = 300 ; v iseta = 2.5v. r set is the resistor connected between the iseta and gnd. figure 3. charge current setting pre- charge current setting during a charge cycle if the battery voltage is below the vprech threshold, the RT9515 applies a pre-charge mode to the battery. this feature revives deeply discharged cells and protects battery life. the RT9515 internally determines the pre-charge rate as 10% of the fast-charge current. battery voltage regulation the RT9515 monitors the battery voltage through the batt pin. once the battery voltage level closes to the vreg threshold, the RT9515 voltage enters constant phase and the charging current begins to taper down. when battery voltage is over the vreg threshold, the RT9515 will stop charge and keep to monitor the battery voltage. however, when the battery voltage decreases 100mv below the v reg , 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 following 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. 0 200 400 600 800 1000 1200 0.5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5 r seta (k) charge current (ma) r set (k ) temperature regulation and thermal protection in order to maximize the charge rate, the RT9515 features a junction temperature regulation loop. if the power dissipation of the ic results in a junction temperature greater than the thermal regulation threshold (125 c), the RT9515 throttles back on the charge current in order to maintain a junction temperature around the thermal regulation threshold (125 c). the RT9515 monitors the junction temperature, t j , of the die and disconnects the battery from the input if t j exceeds 125 c. this operation continues until junction temperature falls below thermal regulation threshold (125 c) by the hysteresis level. this feature prevents the chip from damaging. selecting the input and output capacitors in most applications, the most important is the high- frequency decoupling capacitor on the input of the RT9515. 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 10uf ceramic capacitor to the input. the RT9515 requires a small output capacitor for loop stability. a 1uf ceramic capacitor placed between the batt pin and gnd is typically sufficient. thermal considerations for continuous operation, do not exceed absolute maximum operation junction temperature. the maximum power dissipation depends on the thermal resistance of ic package, pcb layout, the rate of surroundings airflow and temperature difference between junction to ambient. the maximum power dissipation can be calculated by following formula : p d(max) = ( t j(max) - t a ) / ja where t j(max) is the maximum operation junction temperature 125 c, t a is the ambient temperature and the ja is the junction to ambient thermal resistance.
RT9515 10 ds9515-01 april 2011 www.richtek.com figure 5. pcb layout guide for recommended operating conditions specification, where t j(max) is the maximum junction temperature of the die (125 c) and t a is the ambient temperature. the junction to ambient thermal resistance ja is layout dependent. for wdfn-10l 3x3 packages, the thermal resistance ja is 60 c/w on the standard jedec 51-7 four layers thermal test board. the maximum power dissipation at t a = 25 c can be calculated by following formula : p d(max) = (125 c ? 25 c) / (60 c/w) = 1.667w for wdfn-10l 3x3 packages the maximum power dissipation depends on operating ambient temperature for fixed t j(max) and thermal resistance ja . for wdfn-10l 3x3 package, the figure 4 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed. 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 0 25 50 75 100 125 ambient temperature (c) maximum power dissipation (w) wdfn-10l 3x3 four layers pcb figure 4. derating curves for RT9515 package layout considerations for the best performance of the RT9515, the following pcb layout guidelines must be strictly followed. ` place the input and output capacitors as close as possible to the input and output pins respectively for good filtering. ` keep the main power traces as wide and short as possible. ` the connection of r seta should be isolated from other noisy traces. the short wire is recommended to prevent emi and noise coupling. ` connect the gnd and exposed pad to a strong ground plane for maximum thermal dissipation and noise protection. ` the ts's capacitor should be placed close to ts (pin 9) and connected to ground plane. if the pcb layout is poor, it is recommended to use a 10uf at c2 to prevent noise. 9 8 7 9 1 2 3 4 5 10 gnd c2 c3 c1 acin nc gnd chg_s pgood batt ts iseta nc en r seta battery gnd the capacitor should be placed close to ic pin and connected to ground plane. the gnd should be connected to a strong ground plane for heat sinking and noise protection. the connection of r set should be isolated from other noisy traces. the short wire is recommended to prevent emi and noise coupling. the ts's capacitor should be placed close to ts(pin 9) and connected to ground plane.
RT9515 11 ds9515-01 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 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 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 responsibility for any said applications i s assumed by richtek. 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 0.180 0.300 0.007 0.012 d 2.950 3.050 0.116 0.120 d2 2.300 2.650 0.091 0.104 e 2.950 3.050 0.116 0.120 e2 1.500 1.750 0.059 0.069 e 0.500 0.020 l 0.350 0.450 0.014 0.018 w-type 10l dfn 3x3 package 1 1 2 2 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 d 1 e a3 a a1 d2 e2 l b e see detail a

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