RT9513 1 ds9513-01 april 2011 www.richtek.com features z z z z z 18v maximum rating for ac adapter z z z z z internal integrate 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 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 hand held pcs ordering information general description the RT9513 is a fully integrated low cost single-cell li- ion battery charger ic ideal for portable applications. the RT9513 is capable of being powered up from ac adapter. the RT9513 enters sleep mode when ac adapter is removed. the RT9513 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 RT9513 features 18v maximum rating voltages for ac adapter. the other features are under voltage protection, over voltage protection for ac adapter supply. (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. linear single cell li-ion battery charger ic acin nc gnd batt nc iseta nc 9 8 7 9 1 2 3 4 5 10 gnd chg_s pgood en 11 typical application circuit RT9513 1uf ac adapter acin gnd batt + battery pack 1 3 4 5, exposed pad (11) 10 chg_s pgood to system to system 8 en chip shutdown chip enable iseta r set 6 RT9513 package type qw : wdfn-10l 3x3 (w-type) lead plating system g : green (halogen free and pb free)
RT9513 2 ds9513-01 april 2011 www.richtek.com functional pin description pin no. pin name pin function 1 acin wall adaptor charge input supply. 2, 7, 9 n c 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). 10 batt battery charge current output. exposed pad (11) gnd ground. the exposed pad must be soldered to a large pcb and connected to gnd for maximum power dissipation. function block diagram precharge + - 2.5v recharge + - 2.5v + - thermal sense v/i 0.25v 2.5v + - 2.5v v/i + - precharge v ref 2.5v 0.25v 0.5v + - charge done 0.25v logic + - charge disable 0.9v 1ua precharge comparator recharge comparator acin iseta batt voltage amplifier current amplifier tcrmination comparator vcc 115 c chg_s pgood en charge input selection ovp + - 2.5v ovp comparator acin pfet sense fet gnd
RT9513 3 ds9513-01 april 2011 www.richtek.com table no yes yes yes no no yes yes no yes yes v ts > 2.5v or v ts < 0.5v? v batt ~ 4.2v, i batt < 0.1 i chg ? v acin < v batt ? v acin > 6.5v or v acin < 4.4v? v en > 1.4v ? disable mode p-mosfet off i batt = 0 ovp/uvp mode p-mosfet off i batt = 0 sleep mode p-mosfet off i batt = 0 recharge i batt = 0.1 charge current /chg_s pull down standby pfet off v batt = 4.2v, i batt = 0 1ms delay i batt = charge current /chg_s pull down v batt > 4.1 v? v batt > 2.8v? acin power up start-up precharge phase fast charge phase standby/fault recharge phase no RT9513 flow chart disable uvp / ovp sleep start-up no no
RT9513 4 ds9513-01 april 2011 www.richtek.com absolute maximum ratings (note 1) z ac 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 ------------------------------------------------------------------------------------------------------------- 0.926w z package thermal resistance (note 2) wdfn-10l 3x3, ja ------------------------------------------------------------------------------------------------------- 108 c/w wdfn-10l 3x3, jc ------------------------------------------------------------------------------------------------------- 8.2 c/w z lead temperature (soldering, 10 se c.) ------------------------------------------------------------------------------- 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 = 27 c, unless otherwise specification) to be continued parameter symbol test conditions min typ max units supply input ac in input voltage range v acin 4.5 -- 6 v ac in uvp r isin g threshold voltage v uv_high -- 4.4 4.5 v ac in uvp h ysteresis v uv_low 50 80 120 mv ac in stan dby curren t i stby v batt = 4.5v -- 300 500 a ac in shutdown current i shdn v en = high -- 50 100 a ac in uvp cu rren t i uvp v acin = 4v, v batt = 3v -- 150 250 a batt sleep leakage c urrent i sleep v acin = 4 v, v batt = 4.5v -- -- 10 a voltage regulation batt regulation voltage v reg i batt = 60ma 4.158 4.2 4.242 v regulation voltage accuracy ? 1 -- +1 % ac in mosfet r ds(o n)_ac in i batt = 500ma -- 600 -- m current regulation iseta set voltage (fast charge phase) v iseta v batt = 3.5v 2.45 2.5 2.55 v full charge setting range i ch g_ac 100 -- 1200 ma ac charge current accuracy i ch g_ac v batt = 3.8v, r iset = 1.5k -- 500 -- ma recommended operating conditions (note 4) z junction temperature range -------------------------------------------------------------------------------------------- ? 40 c to 125 c z ambient temperature range -------------------------------------------------------------------------------------------- ? 40 c to 85 c
RT9513 5 ds9513-01 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, 1s) 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 h y steresis v prech 50 100 200 mv pre-charge current i pchg v batt = 2v 8 10 12 % recharge threshold batt r e-charge falling threshold hysteresis v re ch _l v reg ? v batt 60 100 150 mv charge termination detection termination current ratio (default) i ter m v batt = 4.2v -- 10 -- % logic input/output chg_s pull down voltage v chg_s tbd, i chg_s = 5m a -- 65 -- mv pgood pull down voltage v pgood tbd, i pgo od = 5ma -- 220 -- mv en threshold 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 a protection thermal regulation -- 125 -- c ovp set internal default -- 6.5 -- v
RT9513 6 ds9513-01 april 2011 www.richtek.com typical operating characteristics acin = 0v to 10v, v batt = 3.7v acin ovp time (1ms/div) i charge (0.5a/div) v acin (5v/div) v batt (2v/div) v out v in chg_s (5v/div) v batt = 3.7v acin power on time (250 s/div) i charge (0.5a/div) v acin (5v/div) v batt (2v/div) chg_s (5v/div) acin ovp time (1ms/div) i charge (0.5a/div) v acin (5v/div) v batt (2v/div) v out v in acin = 5v to 8v to 5v, v batt = 3.7v chg_s (5v/div) v batt = 3.7v acin power off time (500 s/div) i charge (0.5a/div) v acin (5v/div) v batt (2v/div) chg_s (5v/div) input voltage transition time (500 s/div) i charge (1a/div) v acin (5v/div) acin power on v batt = 3.7v chg_s (5v/div) acin power off input voltage transition time (500 s/div) i charge (1a/div) v acin (5v/div) v batt = 3.7v chg_s (5v/div)
RT9513 7 ds9513-01 april 2011 www.richtek.com the parameter k set = 300 ; v set = 2.5v. r seta is the resistor connected between the iseta and gnd. pre- charge current setting during a charge cycle if the battery voltage is below the vprech threshold, the RT9513 applies a pre-charge mode to the battery. this feature revives deeply discharged cells and protects battery life. the RT9513 internal determines the pre-charge rate as 10% of the fast-charge current. battery voltage regulation the RT9513 monitors the battery voltage through the batt pin. once the battery voltage level closes to the vreg threshold, the RT9513 voltage enters constant phase and the charging current begins to taper down. when battery voltage is over the vreg threshold, the RT9513 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. application information automatically power source selection the RT9513 is a battery charger ic which is designed for li-ion battery with 4.2v rated voltage. ac mode : when the ac input voltage (acin) is higher than the uvp voltage level (4.4v), the RT9513 will enter ac mode. in the ac mode, acin p-mosfet is turned on and usb p-mosfet is turned off. sleep mode : the RT9513 will enter sleep mode when ac input voltage are removed. this feature provides low leakage current from the battery during the absence of input supply. acin over voltage protection the ac 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. set charge_ac set seta v i = k r figure 1. ac mode charge current setting 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 charge current (ma) r seta (k ) charge state chg_s pgood acin ch arge on on charge done off on fast-charge current setting the RT9513 offers iseta pin to determine the ac charge rate from 100ma to 1.2a. the charge current can be calculated as following equation.
RT9513 8 ds9513-01 april 2011 www.richtek.com figure 2 temperature regulation and thermal protection in order to maximize the charge rate, the RT9513 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 RT9513 throttles back on the charge current in order to maintain a junction temperature around the thermal regulation threshold (125 c). the RT9513 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 damage. selecting the input and output capacitors in most applications, the most important is the high-frequency decoupling capacitor on the input of the RT9513. 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 RT9513 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 RT9513 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 RT9513. ` 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 connected to a strong ground plane for heat sinking and noise protection. ` the connection of r seta 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 connected to ground plane to reduce noise coupling. 9 8 7 9 1 2 3 4 5 10 gnd c3 c1 acin nc gnd chg_s pgood batt nc iseta nc en r seta 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 seta should be isolated from other noisy traces. the short wire is recommended to prevent emi and noise coupling.
RT9513 9 ds9513-01 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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