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RT9480 ? ds9480-04 december 2014 www.richtek.com 1 copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. ? easy to use power bank solution (ezpbs tm ) integrated chip with two ports output general description the RT9480 is a high integration and easy to use power solution for li-ion power bank and other powered handheld applications. we call it ezpbs tm (easy to use power bank solution). this single chip includes a linear charger, a synchronous boost with dual output load management and a torch function support. the battery volume and the state of charging and discharging can be indicated by 4leds. the RT9480 is available in the wqfn-24l 4x4 package. simplified application circuit features ezpbs tm (easy to use power bank solution) ? ? ? ? ? compact bom elements with ezpbs tm single chip ? ? ? ? ? protection functions (otp, ovp, ocp, vbus and output short protection) ? ? ? ? ? support charging and discharging at the same time by smart algorithm charger ? ? ? ? ? one linear charger up to 1.2a ? ? ? ? ? dpm function (dynamic power management) ? ? ? ? ? thermal regulation ? ? ? ? ? auto-recharge ? ? ? ? ? support jeita function usb output ? ? ? ? ? support dual usb output ? ? ? ? ? auto and button control ? ? ? ? ? sync-boost total output current up to 2.5a ? ? ? ? ? peak efficiency 97% battery state of charge (soc) indicator ? ? ? ? ? battery soc detection ? ? ? ? ? support ntc for battery temperature sensing ? ? ? ? ? 4leds for battery soc display other functions ? ? ? ? ? torch functions applications ? li-ion power bank 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. RT9480 package type qw : wqfn-24l 4x4 (w-type) (exposed pad-option 2) lead plating system g : green (halogen free and pb free) serial number vbat vbus RT9480 ledx vmid lxbst gnd button usbout1 usbout2 swin2 torch input power battery c in battery usb port 1 led indicator usb port 2 torch function c1 c vmid l1 c bat
RT9480 2 ds9480-04 december 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. pin configurations (top view) wqfn-24l 4x4 product name list serial number product name auto/button soc led number programmable battery regulation time out of usbout detach RT9480gqw button 4leds disable 4.2v 12 hours aa01 RT9480gqw-aa01 auto 4leds disable 4.2v 3sec aa02 RT9480gqw-aa02 button 4leds disable 4.35v 12 hours aa03 RT9480gqw-aa03 button 4leds disable 4.2v 3sec ab01 RT9480gqw-ab01 -- -- enable -- -- * : please refer to application note. -- : set by program vbat ts led1 led2 led3 led4 tp1 nc nc gnd button torch usbout1 usbout1 usbout2 nc tp2 swin2 lxbst vmid vbus pgndbst pgndbst lxbst gnd 1 2 3 4 5 6 78910 12 11 18 17 16 15 14 13 21 20 19 24 22 23 25 marking information for marking information, contact our sales representative directly or through a richtek distributor located in your area.
RT9480 3 ds9480-04 december 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. functional pin description pin no. pin name pin function 1 vbat battery charge current output. 2 ts battery temperature sense setting. 3 led1 current sink output for led1. 4 led2 current sink output for led2. 5 led3 current sink output for led3. 6 led4 current sink output for led4. 7, 8, 14 nc no internal connection. 9, 25 (exposed pad) gnd ground. the exposed pad must be soldered to a large pcb and connected to gnd for maximum power dissipation. 10 torch current sink output for torch led function. open drain output 11 button button control input for mode change. 12 tp1 connected to gnd. 13 tp2 connected to gnd. 15 usbout2 usb-2 power output. 16 swin2 usb-2 power input. 17, 18 usbout1 usb-1 power output. 19 vmid boost output. 20, 21 lxbst boost switch output. 22, 23 pgndbst boost power gnd. 24 vbus vbus power supply.
RT9480 4 ds9480-04 december 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. function block diagram linear charger 1.2a central control 1. battery capacity detection 2. protection 3. led display 4. mode control 5. button operation usb-1 load manager up to 2.1a usb-2 load manager up to 1a torch brightness control (open drain) vbat ts led1 led2 led3 led4 gnd button torch usbout1 usbout2 swin2 vmid pgndbst lxbst vbus tp1 tp2
RT9480 5 ds9480-04 december 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. operation the RT9480 is a high integrated ic for li-ion battery power bank. it includes a linear charger 1.2a, a synchronous boost 5.1v, two output load management, led indicator and torch function. change current base on thermal regulation function, the charging current can support up to 1.2a. vbus ovp if the input voltage (vbus) is higher than the threshold voltage v ovp , the internal ovp signal will go high and the charger will stop charging until vin is below v ovp ? v ovp . vmid ovp if the internal voltage (vmid) is higher than the threshold voltage v ovp , the internal ovp signal will go high and the charger will stop charging until vmid is below v ovp ? v ovp . ocp the converter senses the current signal when the high- side p-mosfet turns on. as a result, the ocp is cycle by-cycle current limitation. if the ocp occurs, the converter holds off the next on pulse until inductor current drops below the ocp limit. otp the converter has an over-temperature protection. when the junction temperature is higher than the thermal shutdown rising threshold, the system will be latched and the output voltage will no longer be regulated until the junction temperature drops under the falling threshold. output short protection when output short to ground, the system will be latched and the output voltage will no longer be regulated until power reset. cc/cv/tr multi loop controller there are constant current loop, constant voltage loop and thermal regulation loop to control the charging current. too hot or too cold the temperature sense input ts pin can be connected a thermistor to determine whether the battery is too hot or too cold for charging operation. if the battery's temperature is out of range, charging is paused until it re-enters the valid range.
RT9480 6 ds9480-04 december 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. electrical characteristics recommended operating conditions (note 4) ? supply input voltage, vbat, vbus --------------------------------------------------------------------- 2.8v to 5.5v ? junction temperature range ------------------------------------------------------------------------------ ? 40 c to 125 c ? ambient temperature range ------------------------------------------------------------------------------ ? 40 c to 85 c absolute maximum ratings (note 1) ? supply voltage, vbat -------------------------------------------------------------------------------------- ? 0.3v to 6v ? supply voltage, vbus ------------------------------------------------------------------------------------- ? 0.3v to 10v ? supply voltage usbout1, usbout2 pulse (100 s) ---------------------------------------------- ? 0.3v to 10v ? led output voltage, led1, led2, led3, led4 ---------------------------------------------------- ? 0.3v to 10v ? torch --------------------------------------------------------------------------------------------------------- ? 0.3v to 10v ? other pins ----------------------------------------------------------------------------------------------------- ? 0.3v to 6v ? power dissipation, p d @ t a = 25 c wqfn-24l 4x4 ---------------------------------------------------------------------------------------------- 3.57w ? package thermal resistance (note 2) wqfn-24l 4x4, ja ----------------------------------------------------------------------------------------- 28 c/w wqfn-24l 4x4, jc ---------------------------------------------------------------------------------------- 7.1 c/w ? junction temperature range ------------------------------------------------------------------------------ 150 c ? lead temperature (soldering, 10 sec.) ----------------------------------------------------------------- 260 c ? storage temperature range ------------------------------------------------------------------------------ ? 65 c to 150 c ? esd susceptibility (note 3) hbm (human body model) -------------------------------------------------------------------------------- 2kv mm (ma chine model) --------------------------------------------------------------------------------------- 200v top unit electrical characteristics (v bus = 5v, v bat = 3.7v, t a = 25 c, unless otherwise specified) parameter symbol test conditions min typ max unit supply input battery quiescent current for standby i bat_sdy no vbus, boost on, indicator off. button mode -- 30 -- ? a
RT9480 7 ds9480-04 december 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. parameter symbol test conditions min typ max unit supply input output voltage v outbst -- 5.1 -- v output voltage accuracy v outbst ? 5 -- 5 % max output current as v bat > 3.3v, v out = 5v -- 2.5 -- a pfet peak current limit i ocp 6 -- -- a power switch switching frequency f sw 0.2 0.25 0.3 mhz protection over-voltage protection v mid_ovp 5.6 5.7 6 v over-voltage protection hysteresis v mid_ovp_hys -- 0.2 -- v under-voltage protection (short-circuit protection) v bst_fbuv -- 3.37 -- v boost unit electrical characteristics (v bus = 5v, v bat = 3.7v, t a = 25 c, unless otherwise specified) charger unit electrical characteristics (v bus = 5v, v bat = 3.7v, t a = 25 c, unless otherwise specified) parameter symbol test conditions min typ max unit supply input vbus ? vbat vos rising v os_h -- 100 200 mv vbus ? vbat vos falling v os_l 10 50 -- mv battery charger vbus operating range v bus_chg 4.5 -- 5.5 v vbus regulation dpm v dpm = 4.5v ? 5 -- 5 % voltage regulation vbat regulation v reg t a = 0 to 85 ? c, v reg = 4.2v ? 1 -- 1 % re-charge threshold ? v rechg v reg ? recharge level -- 150 -- mv vbus power fet r ds(on) r ds(on)_chg i bat = 1a -- 200 300 m ? current regulation fast-charge current accuracy i chg i chg = 1.2a ? 5 -- 5 % pre-charge current accuracy i chg_pre ratio of fast-charge current 5.5 10 14.5 % pre-charge threshold v pre v bat rising 2.35 2.5 2.65 v pre-charge threshold hysteresis ? v pre v bat falling 120 200 280 mv charge termination detection termination current ratio i termi -- 10 -- % timer fast-charge time fault t f_cc -- 24 -- hour
RT9480 8 ds9480-04 december 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. note 1. stresses beyond those listed ? absolute maximum ratings ? may cause permanent damage to the device. these are stress ratings only, and 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 may affect device reliability. note 2. ja is measured at t a = 25 c on a high effective thermal conductivity four-layer test board per jedec 51-7. note 3. devices are esd sensitive. handling precaution is recommended. note 4. the device is not guaranteed to function outside its operating conditions. others electrical characteristics (v bus = 5v, v bat = 3.7v, t a = 25 c, unless otherwise specified) parameter symbol test conditions min typ max unit led led current sink i led -- 0.75 -- ma torch open-drain low voltage v odl_t i sink = 5ma -- 200 -- mv button button control logic-high v ih_b 1.5 -- -- v logic-low v il_b -- -- 0.4 v press duty time high-level t press_h 0.1 -- -- sec low-level t press_l 0.1 -- -- sec protection charger thermal regulation t reg for charger -- 105 -- c over-temperature protect t otp -- 150 -- c over-temperature protect hysteresis ? t otp -- 20 -- c vbus ovp threshold voltage v ovp v bus rising 6.5 6.8 7.1 v vbus ovp threshold voltage hysteresis v ovp_hys v bus falling -- 200 280 mv base vbus attached threshold voltage v bus_att v bus rising 3.8 4 4.2 v vbus attached threshold voltage hysteresis v bus_att_hys v bus falling -- 200 280 mv
RT9480 9 ds9480-04 december 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. typical application circuit vbat ts vbus RT9480 pgndbst lxbst gnd button 24 22, 23 19 11 20, 21 2 1 9, 25 (exposed pad) 1f/25v c in input power 1h l1 10f c1 v bat v bat button 10f c bat led1 usbout1 led3 6 5 4 led2 usbout2 led4 3 17, 18 15 10 torch usb1 output 1f c out1 d6 v bat power display vmid r1 vmid swin2 c vmid 16 usb2 output 1f c out2 22f x2 d1 d2 d3 d4 tp1 12 13 tp2 100k r2 100k r3 li-bat prot-ic r ntc n-mosfet + - semitec 103at 10k
RT9480 10 ds9480-04 december 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. usbout efficiency vs. load current 0 10 20 30 40 50 60 70 80 90 100 0 500 1000 1500 2000 2500 load current (ma) efficiency (%) usbout = 5.1v, l = 1 h, c out = 1 f v bat = 3.9v v bat = 3.7v v bat = 3.3v typical operating characteristics usbout voltage v s. temperature 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 -50 -25 0 25 50 75 100 125 temperature (c) output voltage (v) usbout = 5.1v v bat = 3.3v v bat = 3.7v v bat = 3.9v usbout voltage vs. load current 3.0 3.5 4.0 4.5 5.0 5.5 6.0 0 500 1000 1500 2000 2500 load current (ma) output voltage (v) usbout = 5.1v v bat = 3.3v v bat = 3.7v v bat = 3.9v battery regulation voltage vs. temperature 4.10 4.13 4.16 4.19 4.22 4.25 -50 -25 0 25 50 75 100 125 temperature (c) battery regulation voltage (v) 1 v in = 5v, vbat = real battery 105 c ichg thermal regulation vs. temperature 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 -50 -25 0 25 50 75 100 125 temperature (c) ichg thermal regulation (ma ) v in = 5v, vbat = real battery vbus ovp threshold voltage vs. temperature 6.0 6.2 6.4 6.6 6.8 7.0 7.2 -50 -25 0 25 50 75 100 125 temperature (c) ovp threshold voltage (v) vbat = real battery falling rising
RT9480 11 ds9480-04 december 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. application information the RT9480 is a high integrated ic for li-ion battery power bank. this chip includes a linear charger, a synchronous boost, two output load management, led indicator and torch function. pre-charge mode when the output voltage is lower than 2.3v, the charging current will be reduced to a fast-charge current ratio to protect the battery life time. fast-charge mode when the output voltage is higher than 2.5v, the charging current will be equal to the fast-charge current with 1.2a. constant-voltage mode when the output voltage is near 4.2v or 4.35v, the charging current will fall below the termination current. 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 4.05v or 4.2v, then the charging current will resume again. charge termination when the charge current is lower than the charge termination current ratio (10%) for v bat > 4.05v or 4.2v and the time is larger than the deglitch time (25ms), it will be latched high unless the power is re-toggled. input dpm mode if the input voltage is lower than v dpm (4.5v), 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. temperature regulation in order to maximize charge rate, the RT9480 features a junction temperature regulation loop. if the power dissipation of the ic results in junction temperature greater than the thermal regulation threshold (105 c), the RT9480 will cut back on the charge current and disconnect the battery in order to maintain thermal regulation at around 105 c. this operation continues until the junction temperature falls below the thermal regulation threshold (105 c) by the hysteresis level. this feature prevents the maximum power dissipation from exceeding typical design conditions. time fault the fast-charge fault time is set by 24hours. when time fault happens, the charger cycle will be turned off charging function. battery pack temperature monitoring the RT9480 features an external battery pack temperature monitoring input. the ts input connects to the ntc thermistor in the battery pack to monitor battery temperature and prevent danger over temperature conditions. if at any time the voltage at ts falls outside of the operating range, charging will be suspended. the ntc thermistor recommends using 10k . jeita function for jeita battery temperature standard : cv regulation voltage will change at the following battery temp ranges 45 c to 60 c. synchronous step-up the converter operates in fixed frequency pwm mode with 250khz, continuous current mode (ccm), and discontinuous current mode (dcm) with internal mosfets. 4.35v or 4.2v 4.2v or 4.05v 100% ichg 50% ichg 010 4560 c ? c ? c ? c ?
RT9480 12 ds9480-04 december 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. operation method charge mode : vbus in and charging battery discharge mode : usbout in and discharging for handheld chg-dchg mode : vbus and usbout in, charging battery and discharging handheld at the same time relax mode : vbus and usbout plug out button mode button mode : when external handheld device plug in for power bank, the usbout will turns on by button. if device attched, RT9480 will count 12 hours (RT9480gqw or aa02) or 3sec (aa01 or aa03) to turn off usbout after detach. ? aa01 and aa03. please reference product name list. ? attach mean device plug in and loading > 100ma. ? detach mean device plug out and loading < 50ma. function button action description charging na micro-usb adapter plug-in : on after plugging in the external power source, the power bank will be charged automatically without pressing the button, and the led battery indicator lights up at the same time. micro-usb adapter plug-out : off after unplugging the external power source, the power bank stops being charged automatically without pressing the button, and the led battery indicator fades out at the same time. discharging 0.1s usb slave plug-in : on after plugging in the h/h device and pressing the button, the power bank starts to charge the device. usb slave plug-out : off after unplugging the h/h device, the power bank stops charging the device automatically without pressing the button. check battery capacity 0.1s press the button (short press) one time : on press the button (short press), the led battery indicator lights up. after 20sec : off after 20sec, the led battery indicator fades out. torch 0.1s 0.1s double click the button (short press) : on double click the button (short press), the torch light lights up. double click the button (short press : off double click the button (short press) again, the torch light fades out. button function
RT9480 13 ds9480-04 december 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. button press timing define button (short/long) press timing short press = min (0.1s) blank = min (0.1s) soc led flash and running timing soc led flash 0.5s 0.5s soc led running 0.5s 0.5s 0.5s led indicator function about led indicator, it will follow below table to show soc. the led current is 0.75ma. low high : led on, : led off, : led flash battery voltage operation of charging ? 3700mv ? 3700mv ? 3940mv ? 3940mv ? 4100mv ? 4100mv ? 4200mv 4200mv battery voltage operation of discharging ? 4200mv ? 3880mv ? 3880mv ? 3720mv ? 3720mv ? 3500mv ? 3500mv ? 3200mv ? 3200mv ? 2800mv
RT9480 14 ds9480-04 december 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. figure 1. derating curve of maximum power dissipation 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, the maximum junction temperature is 125 c. the junction to ambient thermal resistance, ja , is layout dependent. for wqfn-24l 4x4 package, the thermal resistance, ja , is 28 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) / (28 c/w) = 3.57w for wqfn-24l 4x4 package the maximum power dissipation depends on the operating ambient temperature for fixed t j(max) and thermal resistance, ja . the derating curve in figure 1 allows the designer to see the effect of rising ambient temperature on the maximum power dissipation. 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0 25 50 75 100 125 ambient temperature (c) maximum power dissipation (w) 1 four-layer pcb layout consideration the pcb layout is an important step to maintain the high performance of the RT9480. both the high current and the fast switching nodes demand full attention to the pcb layout to save the robustness of the RT9480 through the pcb layout. improper layout might show the symptoms of poor line or load regulation, ground and output voltage shifts, stability issues, unsatisfying emi behavior or worsened efficiency.for the best performance of the RT9480, 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. ? care should be taken for a proper thermal layout. wide traces, connecting with vias through the layers, provides a proper thermal path to sink the heat energy created from the device and inductor. keep the main power traces as wide and short as possible. recommend as below : vbus trace > 40mil; vbat trace > 80mil; lxbst trace > 80mil; vmid trace > 40mil; usbout1 trace > 80mil; usbout2 trace > 40mil. ? the switching node area connected to lx and inductor should be minimized for lower emi. ? connect the gnd pin, pgndbst pin and exposed pad together to a strong ground plane for maximum thermal dissipation and noise protection. ? directly connect the output capacitors to the feedback network of each channel to avoid bouncing caused by parasitic resistance and inductance from the pcb trace.
RT9480 15 ds9480-04 december 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. figure 2. pcb layout guide 1 2 3 4 5 6 78 10 11 12 13 14 15 16 17 18 19 20 21 24 ts tp2 led2 nc led4 nc gnd torch vmid usbout1 button swin2 led3 nc usbout2 led1 vbat vbus pgndbst lxbst lxbst usbout1 pgndbst gnd tp1 gnd c mid vbat vbat gnd gnd gnd vmid l1 c1 gnd r1 lx should be connected to inductor by wide and short trace, keep sensitive compontents away from this trace input capacitors must be placed as close as possible to the input pins. usbout2 connect the exposed pad to a ground plane. d1 d2 d3 vmid vbus vmid r ntc c out2 c out1 c in c bat usbout1 d4 d6 output capacitors must be placed as close as possible to the output pins. 22 23 9 connect gnd pin and pgnd pin to exposed pad. r3 r2
RT9480 16 ds9480-04 december 2014 www.richtek.com richtek technology corporation 14f, no. 8, tai yuen 1 st street, chupei city hsinchu, taiwan, r.o.c. tel: (8863)5526789 richtek products are sold by description only. richtek reserves the right to change the circuitry and/or specifications without notice at any time. customers should obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. richtek cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a richtek product. information furnish ed by richtek is believed to be accurate and reliable. however, no responsibility is assumed by richtek or its subsidiaries for its use; nor for any infringeme nts of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of r ichtek or its subsidiaries. outline dimension a a1 a3 d e d2 e2 l b e 1 see detail a w-type 24l qfn 4x4 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 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 3.950 4.050 0.156 0.159 option 1 2.400 2.500 0.094 0.098 d2 option 2 2.650 2.750 0.104 0.108 e 3.950 4.050 0.156 0.159 option 1 2.400 2.500 0.094 0.098 e2 option 2 2.650 2.750 0.104 0.108 e 0.500 0.020 l 0.350 0.450 0.014 0.018

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