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RT9516 1 ds9516-01 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 cellular phones z digital cameras z pdas and smart phones z probable instruments pin configurations general description the RT9516 is a fully integrated low cost single-cell li-ion battery charger ideal for portable applications. the RT9516 is capable of being powered up from ac adapter and usb (universal serial bus) port inputs. the RT9516 enters sleep mode when supplies are removed. the RT9516 optimizes the charging task by using a control algorithm including preconditioning mode, fast charge mode and constant voltage mode. the charging task will keep in constant voltage mode to hold the battery in a full charge condition. the charge current can be programmed with an external resister. the internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures. the RT9516 features 28v maximum rating voltages for vin. the other features are under voltage protection, over voltage protection for ac adapter supply. RT9516 also provide a booting assistant circuit which detect input source and battery connection condition and provide an output signal (abo) for system booting. the RT9516 is available in wdfn-8l 2x2 tiny package to achieve best solution for pcb space and total bom cost saving considerations. linear single cell li-lon battery charger with single input supply for portable applications features z z z z z 28v maximum rating for ac adapter z z z z z internal integrated power mosfets z z z z z ac adapter power good status indicator z z z z z programmed charging current z z z z z output for auto-booting z z z z z under voltage protection z z z z z over voltage protection z z z z z thermal feedback optimizing charge rate z z z z z rohs compliant and halogen free wdfn-8l 2x2 (top view) marking information for marking information, contact our sales representative directly or through a richtek distributor located in your area. vin abi gnd batt abo iset 7 6 5 1 2 3 4 8 gnd 9 pgood en RT9516 package type qw : wdfn-8l 2x2 (w-type) lead plating system g : green (halogen free and pb free)
RT9516 2 ds9516-01 april 2011 www.richtek.com function block diagram typical application circuit system supply abi abo batt iset RT9516 c in 1f vin 1 2 3 4 5 6 7 8 v in (adapter or usb) gnd c out battery pack r set to system 2.2f pgood en chip enable cc/cv/tr loop controller logic controller ovp uvlo 200k 200k batt abo v batt abi gnd en iset vin pgood
RT9516 3 ds9516-01 april 2011 www.richtek.com functional pin description pin no. pin name pin function 1 vin input power source. the vin can withstand up to 28v input. 2, 9 (exposed pad) gnd power ground. the exposed pad must be soldered to a large pcb and connected to gnd for maximum power dissipation. 3 iset charge current set point. 4 abi auto-booting external input. abi is pulled to gnd through an internal 200k resistor. 5 abo auto-booting logic output. 6 en charge enable (active low). with internal 200k pull low resistor. 7 pgood pgood pin connect to vin with 10 n-mosfet as power good condition. 8 batt battery charge current output. flow chart standby state p-mosfet = off batt > 2.5v soft-start power off state p-mosfet = off any state or v in > ovp or en = h yes no v in - v batt > v os sleep state p-mosfet = off no fast-charge i chg_f = 570ma r set = 2.8k cv state v batt = 4.2v i chg = 0a pre_charge i chg_pre = (1/10) x i chg_f v in < ovp & en = h yes yes no yes no batt v4.2v
RT9516 4 ds9516-01 april 2011 www.richtek.com absolute maximum ratings (note 1) z supply voltage, v in ------------------------------------------------------------------------------------------------------- ? 0.3v to 28v z other pins ------------------------------------------------------------------------------------------------------------------- ? 0.3v to 28v z power dissipation, p d @ t a = 25 c wdfn-8l 2x2 -------------------------------------------------------------------------------------------------------------- 0.606w z package thermal resistance (note 2) wdfn-8l 2x2, ja --------------------------------------------------------------------------------------------------------- 165 c/w z lead temperature (soldering, 10 se c.) ------------------------------------------------------------------------------- 260 c z junction temperature ----------------------------------------------------------------------------------------------------- 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 recommended operating conditions (note 4) z supply voltage,v in -------------------------------------------------------------------------------------------------------- 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 batt = 4v, t a = 25 c, unless otherwise specified) parameter symbol test conditions min typ max unit offset voltage (v in ? v batt ) rising v os-r -- 90 150 mv offset voltage (v in ? v batt ) falling v os -f 10 50 -- mv vin standby current i stby v b att = 4.5v -- 300 500 a over voltage protection threshold v ovp 6.5 7 7.5 v battery regulation voltage regulation v re g t a = 0 to 85 c 4.158 4.2 4.242 v batt sleep leakage current i sleep -- 1 10 a vin power mosfet r ds(on) i batt = 0.5a -- 0.4 0.8 iset set voltage (fast charge) v iset -- 1.4 -- v charge current accuracy i chg r set = 2.8k 524 570 616 ma batt pre-charge threshold v pchg_batt batt rising 2.3 2.5 2.7 v pre-charge current i pchg 4 10 15 % logic-high v ih 1.5 -- -- v en threshold voltage logic-low v il -- -- 0.4 v enable pull low resistor -- 200 -- k thermal regulation -- 115 -- c pgood pull down voltage v pgood 5ma -- 65 -- mv logic-high v ih 1.5 -- -- v abi threshold voltage logic-low v il -- -- 0.4 v abi pull low resistor -- 200 -- k abo pull down voltage 5ma -- 100 -- mv
RT9516 5 ds9516-01 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 low effective thermal conductivity single layer test board of jedec 51-3 thermal measurement standard. note 3. devices are esd sensitive. handling precaution is recommended. note 4. the device is not guaranteed to function outside its operating conditions.
RT9516 6 ds9516-01 april 2011 www.richtek.com input shutdown current vs.input voltage 100 120 140 160 180 200 4.0 4.3 4.6 4.9 5.2 5.5 5.8 6.1 6.4 6.7 7.0 input voltage (v) input shutdown current ( a) 1 v batt = 3.7v power off from acin time (1ms/div) v in (5v/div) v batt (2v/div) v iset (1v/div) i in (500ma/div) i chg = 500ma power off from en time (50 s/div) en (1v/div) v batt (2v/div) v iset (1v/div) i in (500ma/div) v in = 5v, i chg = 500ma typical operating characteristics batt pre-charge power on time (1ms/div) en (1v/div) v batt (2v/div) v iset (100mv/div) i in (200ma/div) v in = 5v, i chg = 50ma batt fast-charge power on time (1ms/div) en (1v/div) v batt (2v/div) v iset (1v/div) i in (500ma/div) v in = 5v, i chg = 500ma input standby current vs. input voltage 0 50 100 150 200 250 4.0 4.3 4.6 4.9 5.2 5.5 5.8 6.1 6.4 6.7 7.0 input voltage (v) input standby current ( a) 1 v batt = 4.5v, c in = 1 f
RT9516 7 ds9516-01 april 2011 www.richtek.com charge current vs. r set 0 200 400 600 800 1000 1200 1234567891011121314 r set charge current (ma ) v in = 5v, v batt = 3.7v (k ) battery regulation voltage vs. temperature 4.150 4.155 4.160 4.165 4.170 4.175 4.180 4.185 4.190 -40 -20 0 20 40 60 80 100 120 temperature (c) battery regulation voltage (v ) v in = 5v input ovp vs. temperature 6.5 6.6 6.7 6.8 6.9 7.0 7.1 -40 -20 0 20 40 60 80 100 120 temperature (c) input ovp (v) v batt = 3.7v
RT9516 8 ds9516-01 april 2011 www.richtek.com applications information the RT9516 is a fully integrated low cost single-cell li-ion battery charger with a constant current (cc mode) or a constant voltage (cv mode). the cc mode current is set with the external resistor r set and the cv mode voltage is fixed at 4.2v. if the battery voltage is below a typical 2.5v pre-charge threshold, the RT9516 charges the battery with a trickle current until the battery voltage rises above the pre-charge threshold. the RT9516 is capable of being powered up from ac adapter and usb (universal serial bus) port inputs. acin over-voltage protection the input voltage is monitored by the internal comparator. the ovp threshold is set at 7v (typ.). when the input voltage exceeds the threshold, the controller 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. however, ac input voltage over 28v still leads the RT9516 to damage. when the input overvoltage condition is removed, the controller will enables the output by running through the soft-start. charger enable input en is an active-low logic input to enable the charger. drive the en pin to low or leave it floating to enable the charger. this pin has a 200k internal pull down resistor. so when left floating, the input is equivalent to logic low. drive this pin to high to disable the charger. battery charge profile the RT9516 charges a li-ion battery with a constant current (cc) or a constant voltage (cv). the constant current of iset is set with the external resistor r set and the constant voltage is fixed at 4.2v. if the battery voltage is below a typical 2.5v trickle-charge threshold, the RT9516 charges the battery with a trickle current until the battery voltage rises above the trickle charge threshold. when the battery voltage reaches 4.2v, the charger enters a cv mode and regulates the battery voltage at 4.2v to fully charge the battery without the risk of over charge. figure 1 a. battery pre-charge current during a charge cycle, if the battery voltage is below the pre-charge threshold, the RT9516 applies a pre-charge mode to the battery. this feature revives deeply discharged cells and protects battery life. the internally determined pre-charge rate of the RT9516 is 10% of the constant charge current. b. battery fast-charge current the RT9516 offers iset pin to determine the charge current. by an external resistor connected between the iset and gnd. the charge current can be calculated by the following equation : set set set charge r v k i = k set = 1140; v set = 1.4(typ.) figure 2 time pre-charge mode constant current mode constant voltage mode recharge phase 2.5v precharge threshold 10% programmed charge current programmed charge current 4.2v battery regulation voltage threshold i iset charge current vs. r set 0 200 400 600 800 1000 1200 1234567891011121314 r set charge current (ma ) (k )
RT9516 9 ds9516-01 april 2011 www.richtek.com c. battery voltage regulation (cv mode) the battery voltage regulation feedback is through the batt pin. the RT9516 monitors the battery voltage between the batt and gnd pins. when battery voltage is close to battery regulation voltage threshold, the voltage regulation phase begins and the charging current begins to taper down. when battery voltage is over battery regulation voltage threshold and charge mode stops, the RT9516 still monitors the battery voltage. charge current is resumed when the battery voltage under battery regulation voltage threshold. sleep mode the RT9516 enters the sleep mode if both ac and usb are removed from the input. this feature prevents draining the battery during the absence of input supply. power good the open-drain output pin is used to indicate the input voltage status. the pgood output asserts low when v in > 4.25v and (v in ? v batt ) > 40mv. these pgood pin can be used to drive led or communicate to the host processor. note that on indicates the open-drain transistor is turned on and led is bright. auto-booting the RT9516 has an internal ? or ? gate that generates an enable signal for system booting. the battery supplies power to the ? or ? gate, the RT9516 will keep batt pin voltage to supply the ? or ? gate function when the battery isn connected at batt pin. the first input is the ac_pg and the second input is an external signal (abi). when the (v in ? v batt ) > 90mv, the ac_pg signal is high. the abi signal is driven by an external system, when external signal is floating, the abi has an internal pull low resistor. figure 3 temperature regulation and thermal protection in order to maximize charge rate, the RT9516 features a junction temperature regulation loop. if the power dissipation of the ic results in a junction temperature that is greater than the thermal regulation threshold (115 c), the RT9516 throttles back on the charge current in order to maintain a junction temperature around the thermal regulation threshold (115 c). the RT9516 monitors the junction temperature, t j , of the die and disconnects the battery from the input if t j exceeds 115 c. this operation continues until junction temperature falls below thermal regulation threshold (115 c by the hysteresis level. this feature prevents the maximum power dissipation from exceeding typical design conditions. selecting the input and output capacitors in most applications, a high-frequency decoupling capacitor on the input.(1 f ceramic capacitor), placed in close proximity to the input works well. in some applications depending on the power supply characteristics and cable length, it may be necessary to add an additional 10 f ceramic capacitor to the input. the RT9516 requires a small output capacitor for loop stability. a 1 f ceramic capacitor placed between the batt pin and gnd is typically sufficient. thermal conderations 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, t a is the ambient temperature and the ja is the junction to ambient thermal resistance. for recommended operating conditions specification of RT9516, where t j(max) is 125 c and t a is the operated ambient temperature. the junction to ambient thermal resistance ja for wdfn-8l 2x2 package is 165 c/w on the standard jedec 51-3 single-layer thermal test board. ac_pg 200k abi abo v batt
RT9516 10 ds9516-01 april 2011 www.richtek.com layout consideration the RT9516 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 RT9516. ` 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 from the sensitive devices or 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 r set 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 the ic and connected to ground plane to reduce noise coupling. figure 5. pcb layout guide the maximum power dissipation at t a = 25 c can be calculated by following formula : p d(max) = (125 c ? 25 c) / (165 c /w) = 0.606w for wdfn-8l 2x2 package the maximum power dissipation depends on operating ambient temperature for fixed t j(max) and thermal resistance ja . for RT9516 package, the figure 4 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed. figure 4. derating curves for RT9516 package r set the connection of resistor should be isolated from other noisy traces. the short wire is recommended to prevent emi and noise coupling. the gnd should be connected to a strong ground plane for heat sinking and noise protection. c out c in gnd the capacitor should be placed close to ic pin and connected to ground plane. vin abi gnd batt abo iset 7 6 5 1 2 3 4 8 gnd 9 en pgood gnd 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 25 50 75 100 125 ambient temperature (c) power dissipation (w) single layer pcb wdfn-8l 2x2
RT9516 11 ds9516-01 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 w-type 8l dfn 2x2 package 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 0.200 0.300 0.008 0.012 d 1.950 2.050 0.077 0.081 d2 1.000 1.250 0.039 0.049 e 1.950 2.050 0.077 0.081 e2 0.400 0.650 0.016 0.026 e 0.500 0.020 l 0.300 0.400 0.012 0.016 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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