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rt9460 ? ds9460-04 august 2017 www.richtek.com 1 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. switch-mode single cell li-ion charger with usb-otg general description the rt9460 is a switch-mode single cell li-ion/li-polymer battery charger for portable applications. it integrates a synchronous pwm controller, power mosfets, input current sensing and regulation, and high accuracy voltage regulation and charge termination circuits. besides, the charging current is regulated through the integrated sensing resistors. the rt9460 also features usb on- the-go (otg) support. the rt9460 optimizes the charging task by using a control algorithm to vary the charge rate via different modes, including pre-charge mode, fast charge mode, and constant voltage mode. the key charge parameters are programmable via the i 2 c interface. the rt9460 resumes the charge cycle whenever the battery voltage falls below an internal recharge threshold, and automatically enters sleep mode when the input power supply is removed. other features include under-voltage protection, over- voltage protection, thermal regulation and reverse leakage protection. the rt9460 is available in the small wl-csp-25b 2.52x2.52 packages. applications ? cellular telephones ? personal information appliances ? tablet pc, power bank ? portable instruments simplified application circuit features ? ? ? ? ? high accuracy voltage/current regulation ? ? ? ? ? average input current regulation (aicr) : 0.1/0.15/ 0.5/ to 3a per 0.1a ? ? ? ? ? minimum input voltage regulation ? ? ? ? ? for 5v adaptor : 4v/4.25v/4.5v/4.75v ? ? ? ? ? for 9v adaptor : 7v/7.5v/8v/8.5v ? ? ? ? ? charge current regulation accuracy : 5% ? ? ? ? ? charge voltage regulation accuracy : 1% (0 to 85 c) ? ? ? ? ? integrated power mosfets for up to 3.125a charge rate ? ? ? ? ? support usb charging detection ? ? ? ? ? battery temperature sensing ? ? ? ? ? synchronous 0.75/1.5mhz fixed frequency pwm controller with up to 95% duty cycle ? ? ? ? ? reverse leakage protection to prevent battery drainage ? ? ? ? ? thermal regulation and protection ? ? ? ? ? over temperature protection ? ? ? ? ? input over voltage protection ? ? ? ? ? irq output for communication with i 2 c ? ? ? ? ? automatic charging ? ? ? ? ? rohs compliant and halogen free ppctrl lx pgnd dp rt9460 vin to adaptor/usb sys mid dm scl sda battery pack c in c mid l c sys to system external path (option) bat c bat + vpts r pull ts r ntc
2 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. 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. pin configuration (top view) wl-csp-25b 2.52x2.52 (bsc) a3 a4 a5 a1 a2 b3 b4 b5 b1 b2 c3 c5 c4 c1 c2 d3 d4 d5 d1 d2 e3 e4 e5 e1 e2 irq mid vin vin ceb lx otg scl lx boot sda pgnd pgnd vddp agnd sys dp sys ts stat bat dm bat vpts ppctrl marking information 0e ym dnn 0e : product code ymdnn : date code package type wsc : wl-csp-25b 2.52x2.52 (bsc) rt9460
3 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. functional pin description pin no. pin name pin description a1, a2 vin power input. a3 mid connection point between reverse blocking mosfet and high-side switching mosfet. a4 irq irq output node. a5 ceb enable control input. low active. with internal 102k ? pull low resistor. b1, b2 lx switch node. connect to an external inductor. b3 boot bootstrap supply for high-side mosfet. connect a capacitor between boot and lx. b4 otg setting input pin otg boost mode. with internal 102k ? pull low resistor. b5 scl clock input for i 2 c. open-drain output. connect a pull-up resistor. c1, c2 pgnd power ground for switching charger. c3 vddp internal power for power stage. c4 agnd analog ground. c5 sda data input for i 2 c. open drain output. connect a pull-up resistor. d1, d2 sys system voltage regulator node. d3 stat charge status indicator (open drain). d4 ts battery temperature detection pin. d5 dp usb charger type detection pin. e1, e2 bat charging current output node. battery charging voltage regulation feedback pin with power path. e3 ppctrl power path control pin (connect to external p-mosfet gate). e4 vpts supply voltage for battery temperature detection. e5 dm usb charger type detection pin.
4 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. functional block diagram operation the rt9460 is an integrated single cell li-ion battery switching charger with power path controller. base circuits base circuits provide the internal power, vddp and reference voltage and bias current. protection circuits the protection circuits include the vinovp, vinuvlo, batovp and otp circuits. the protection circuits turn off the charging when the input power or die temperature is in abnormal level. buck regulator for charging and boost regulator as otg the multi-loop controller controls the operation of charging process and current supply to the system. it also controls the circuits as a boost converter for otg applications. battery detection the rt9460 is capable of doing the battery absence detection. the detection protects the charger when battery is removed accidentally. adaptor detection if the poor input power source is connected to rt9460, the operation is shut down by the adaptor detection. power path management and control once the battery voltage increase to a defined system minimum regulation voltage, the internal path between sys and bat will be fully turned on (cool ppm operation). that is, a better charging efficiency can be derived. when end of charge occurs, the charing stops and the internal path will be off. usb charger detection the rt9460 detects and distinguishes sony, apple nikon and usb charger (standard charger port, charging downstream port and dedicated charger port) via dp and dm pins. ts detection the rt9460 detects the temperature of the battery pack via ts and vpts pins. the vpts pin provides a constant voltage source used to drive the voltage divider composed of a pulled-high resister and a ntc resister. the rt9460 reports the sensing results via irq and status bits for cold, cool, warm and hot. i 2 c controller the key parameters of charging and otg are programmable through i 2 c commands. analog base protection pgnd agnd vin scl lx boot mid sda state machine i 2 c ppctrl otg bat pp controller switching charger controller sys battery temp. detection vddp stat ceb dp dm irq vpts ts
5 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. electrical characteristics absolute maximum ratings (note 1) ? supply input v oltage, vin ----------------------------------------------------------------------------------------------- ? 0.3v to 28v ? mid, boot ----------------------------------------------------------------------------------------------------------------- ? 0.3v to 28v ? lx ----------------------------------------------------------------------------------------------------------------------------- ? 0.3v to 20v ? mid ? vin, boot ? lx -------------------------------------------------------------------------------------------------- ? 0.3v to 6v ? other pins ------------------------------------------------------------------------------------------------------------------ ? 0.3v to 6v ? power dissipation, p d @ t a = 25 c wl-csp-25b 2.52x2.52 (bsc) ---------------------------------------------------------------------------------------- 3.11w wqfn-32l 4x4 ------------------------------------------------------------------------------------------------------------ 3.59w ? package thermal resistance (note 2) wl-csp-25b 2.52x2.52 (bsc), ja ---------------------------------------------------------------------------------- 32.1 c/w wqfn-32l 4x4, ja ------------------------------------------------------------------------------------------------------ 27.8 c/w wqfn-32l 4x4, jc ------------------------------------------------------------------------------------------------------ 7 c/w ? lead temperature (soldering, 10 sec.) ------------------------------------------------------------------------------ 260 c ? junction temperature ---------------------------------------------------------------------------------------------------- 150 c ? storage temperature range -------------------------------------------------------------------------------------------- ? 65 c to 150 c ? esd susceptibility (note 3) hbm (human body model) --------------------------------------------------------------------------------------------- 2kv mm (ma chine model) ----------------------------------------------------------------------------------------------------- 200v recommended operating conditions (note 4) ? supply input voltage, vin ----------------------------------------------------------------------------------------------- 4.3v to 9v ? junction temperature range ------------------------------------------------------------------------------------------- ? 40 c to 125 c ? ambient temperature range ------------------------------------------------------------------------------------------- ? 40 c to 85 c (v in = 5v, v bat = 4.2v, l = 2.2 h, c in = 2.2 f, c bats = 10 f, t a = 25 c, unless otherwise specified) parameter symbol test conditions min typ max unit protection v in ovp threshold voltage 15 16 17 v v in ovp hysteresis -- 200 -- mv battery ovp 110 117 124 % battery ovp hysteresis -- 10 -- % over-temperature protection otp -- 165 -- c otp hysteresis -- 10 -- c thermal regulation threshold charge current begins to reduce -- 120 -- c system uvp threshold voltage v sys_uvp -- 2.4 -- v
6 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. parameter symbol test conditions min typ max unit sleep mode comparator sleep mode entry threshold v in ? v bats v slp 2.5v < v batx < v batreg , v in falling 0 0.04 0.1 v sleep mode exit hysteresis v in ? v bats v slpexit 2.5v < v batx < v batreg 40 100 200 mv sleep mode deglitch time t slp v in rising above v slp + v slpexit -- 128 -- ms under-voltage lockout threshold ic active threshold voltage v uvlo v in rising 3.05 3.3 3.55 v ic active hysteresis ? v uvlo v in falling from uvlo -- 150 -- mv input currents vin supply current i q pwm switching, i chg = i bat = 0ma -- 10 -- ma pwm is not switching. i chg = i bat = 0ma -- -- 5 ma high impendence mode -- -- 150 ? a leakage current from battery i bat v in = 0v, charger off. -- -- 25 ? a input power regulation input voltage regulation v mivr i 2 c programmable refer to reg0x21[3:0] 4 -- 8.5 v vmivr accuracy ? 5 -- 5 % average input current regulation accuracy i aicr usb charge mode, i aicr = 100ma 80 -- 100 ma usb charge mode, i aicr = 500ma 400 -- 500 usb charge mode, i aicr = 1a 800 -- 1000 battery voltage regulation battery voltage regulation v oreg i 2 c programmable per 20mv. 3.5 -- 4.62 v vbatreg accuracy 0 to 85c ? 1 -- 1 % re-charge threshold v rech v batx falling, below v batreg -- 125 -- mv re-charge deglitch t rech -- 128 -- ms system minimum regulation voltage system minimum regulation voltage v sys i 2 c programmable per 0.1v 3.5 -- 3.8 v charging current regulation output charging current i chg i 2 c programmable per 0.125a 1.25 -- 3.125 a ichg accuracy aicr is disabled ? 5 -- 5 % pre-charge threshold v prec i 2 c programmable per 0.2v 2 -- 3 v vprec accuracy ? 5 -- 5 % pre-charge current i prec i 2 c programmable per 50ma 100 -- 850 ma iprec accuracy ? 30 -- 30 %
7 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. parameter symbol test conditions min typ max unit charge termination detection end of charge current i eoc i 2 c programmable per 50ma 100 -- 450 ma fixed ieoc as i aicr = 100ma -- 50 -- ma ieoc accuracy ? 100 -- 100 ma deglitch time for eoc t eoc i chg < i eoc , v bat > v rec -- 2 -- ms pwm high-side on-resistance from vin to lx, exclude i aicr = 100ma -- 90 150 m ? low-side on-resistance from lx to pgnd -- 60 100 m ? charging efficiency v batx = 4v, and i chg = 2a, -- 85 -- % oscillator frequency osc i 2 c programmable 0.75/1.5 mhz -- 1.5 -- mhz frequency accuracy ? 10 -- 10 % maximum duty cycle at minimum voltage input -- 95 -- % minimum duty cycle 0 -- -- % peak ocp as charger mode i chgocp -- 4.5 -- a power path on-resistance from sys to vbat -- 35 60 m ? boost mode operation output voltage level v otg to vin -- 5.05 -- v output voltage accuracy ? 3 -- 3 % efficiency v batx = 4v, and i in = 0.8a, -- 85 -- % max output current i 2 c programmable, 0.5a/1a 1 -- -- a peak over-current protection -- 4.5 -- a vin ovp as otg boost -- 6 -- v vin ovp hysteresis -- 250 -- mv minimum battery voltage for boost v batmin as boost start-up -- 2.9 -- v minimum battery voltage hysteresis -- 400 -- mv i 2 c characteristics output low voltage v ol i ds = 10ma -- -- 0.4 v scl, sda input threshold voltage logic-high v ih 1.3 -- -- v logic-low v il -- -- 0.4 scl clock -- -- 400 khz
8 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. parameter symbol test conditions min typ max unit dp dm detection d+ voltage source v dp_scr 0.5 0.6 0.7 v d+ voltage source output current 200 -- -- ? a d- current sink i dm_sink 50 100 150 ? a input capacitance c i dm pin, switch open -- 4.5 5 pf ? dp pin, switch open -- 4.5 5 input leakage i i dm pin, switch open ? 1 -- 1 ? a ? dp pin, switch open ? 1 -- 1 dp low comparator threshold v dp_low 0.8 -- -- v dm high comparator threshold v dm_high 0.8 -- -- v dm low comparator threshold v dm_low -- -- 475 mv ntc monitor hot threshold v vts_hot vts falling, the ratio of vpts, vin > v in(min) 29 30 31 %vpts warm threshold v vts_warm vts falling, the ratio of vpts, vin > v in(min) 37 38 39 %vpts cool threshold v vts_cool vts rising, the ratio of vpts, vin > v in(min) 55 56 57 %vpts cold threshold v vts_cold vts rising, the ratio of vpts, vin > v in(min) 59 60 61 %vpts low temperature hysteresis ? v vts -- 1 -- %vpts disable threshold v vts_off ts function disable 2 3 4 %vpts control i/o pin output low voltage for stat v ol i ds = 10ma -- -- 0.4 v ce input threshold voltage logic-high v ih 1.3 -- -- v logic-low v il -- -- 0.4 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. jc is measured at the exposed pad of 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.
9 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. typical application circuit ppctrl lx agnd pgnd dp rt9460 2.2h vin to adaptor/usb 2.2f 47nf boot sys mid 4.7f dm scl sda battery pack c in vddp 1f c vddp to usb connector to i 2 c bus irq stat otg ceb c mid c boot l 22f c sys to system external path (option) bat 10f c bat + vpts r pull ts r ntc a1, a2 a3 a4 a5 b1, b2 b3 b4 b5 c1, c2 c4 c3 d1, d2 d3 d4 d5 e1, e2 e3 c5 e4 e5
10 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. efficiency vs. v bat 65 70 75 80 85 90 95 3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4 4.1 4.2 4.3 v bat (v) efficiency (%) efficiency vs. v bat 65 70 75 80 85 90 95 3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4 4.1 4.2 4.3 v bat (v) efficiency %) charge current vs. v bat 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4 4.1 4.2 4.3 v bat (v) charge current (a ) charge current vs. v bat 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4 4.1 4.2 4.3 v bat (v) charge current (a ) typical operating characteristics supply current vs. input voltage 0 10 20 30 40 50 60 70 80 90 100 456789101112131415 input voltage (v) supply current ( a) 1 high impendence mode hz_v bat = 3.8v hz_v bat = 2.6v leakage current vs. battery voltage 0 2 4 6 8 10 12 14 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 4 4.2 4.4 battery voltage (v) leakage current ( a) 1 v bat high to low i chrg = 1250ma, cv max, no input current limit v in = 5v v in = 5.5v v in = 9v i chrg = 1250ma, cv max, no input current limit v in = 5v v in = 5.5v v in = 9v i chrg = 2000ma, cv max, no input current limit v in = 5v v in = 5.5v v in = 9v i chrg = 2000ma, cv max, no input current limit v in = 5v v in = 5.5v v in = 9v
11 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. input voltage vs. load current 5.00 5.01 5.02 5.03 5.04 5.05 5.06 5.07 5.08 5.09 5.10 0 0.2 0.4 0.6 0.8 1 load current (a) input voltage (v) v bat = 3v v bat = 3.3v v bat = 3.6v v bat = 3.9v v bat = 4.2v boost mode, cv = 5.05v efficiency vs. load current 0 10 20 30 40 50 60 70 80 90 100 00.20.40.60.81 load current (a) efficiency (%) boost mode, cv = 5.05v v bat = 4.2v v bat = 3.9v v bat = 3.6v v bat = 3.3v v bat = 3v
12 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. applications information the rt9460 switching charger integrates a synchronous pwm controller with power mosfets to provide input voltage mivr (minimum input voltage regulation), input current aicr (active input current regulation), high accuracy current and voltage regulation, and charge termination. the charger also features usb otg (on-the- go). the rt9460 has three operation modes : charge mode, boost mode (usb otg), and high impedance mode. in charge mode, the rt9460 supports a precision charging system for single cell. in boost mode, the rt9460 works as the boost converter and boosts the voltage from battery to vin pin for sourcing the otg devices. in high impedance mode, the rt9460 stops charging or boosting and operates in a mode with low current from vin or battery to reduce the power consumption when the portable device is in standby mode. notice that the rt9460 integrate input power source (ac adapter or usb input) detection. thus, the rt9460 can automatically set the charge current by option. the charge current needs to be set via i 2 c interface by the host. the rt9460 application mechanism and i 2 c compatible interface are introduced in later sections. charge mode operation minimum input voltage regulation (mivr) the rt9460 features input voltage mivr function to prevent input voltage drop due to insufficient current provided by the adaptor or usb input. if mivr function is enabled, the input voltage decreases when the over current of the input power source occurs. vin is regulated at a predetermined voltage level which can be set as 4v to 8.5v by i 2 c interface. at this time, the current drawn by the rt9460 equals to the maximum current value that the input power can provide at the predetermined voltage level, instead of the set value. charge profile the rt9460 provides a precision li-ion or li-polymer charging solution for single-cell applications. input current limit, charge current, termination current, charge voltage and input voltage mivr are all programmable via the i 2 c interface. in charge mode, the rt9460 has five control loops to regulate input current (aicr), charge current, charge voltage, input voltage (mivr) and device junction temperature. during the charging process, all five loops (if mivr is enabled) are enabled and the dominant one will take over the control. for normal charging process, the li-ion or li-polymer battery is charged in three charging modes depending on the battery voltage. at th e beginning of the charging process, the rt9460 is in pre-charge mode. when the battery voltage rises above pre-charge threshold voltage (v prec ), the rt9460 enters fast-charge mode. once the battery voltage is close to the regulation voltage (v oreg ), the rt9460 enters constant voltage mode. pre-charge mode for life-cycle consideration, the battery can not be charged with large current under low battery condition. when the bats pin voltage is below pre-charge threshold voltage (v prec ), the charger is in pre-charge mode with a weak charge current witch equals to the pre-charge current (i prec ). there are two control loops in pre-charge mode. one is the icc and the other is the min_sys. if the battery voltage is lower than the sys voltage, the mosfet won't fully turn-on to prevent the battery voltage to influence the sys voltage. it features that the charger can also provide the current to the load from sys even the battery voltage is too low. in pre-charge mode, the charger basically works as an ldo. the pre-charge current also acts as the current limit when the bats pin is shorted. the pre-charge current levels are 100ma - 850ma programmed by i 2 c.
13 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. fast-charge mode and settings as the bat pin rises above vprec, the charger enters fast-charge mode and starts charging. notice that the muic integrates input power source (ac adapter or usb input) detection. thus, the switching charger can set the charge current by option automatically. unlike the linear charger (ldo), the switching charger (buck converter) is a current amplifier. the current drawn by the switching charger is different from the current into the battery. the user can set the average input current regulation (aicr) and output charge current (i chrg ) respectively. cycle-by-cycle current limit the charger of the rt9460 has an embedded cycle-by- cycle current limit for inductor. once the inductor current touches the threshold (4.5a typ.), the charger stops charging immediately to prevent over current from damaging the device. notice that, the mechanism can not be disabled by any way. average input current regulation (aicr) the aicr setting is controlled by i 2 c. the aicr100 mode limits the input current to 100ma. the aicr500 mode limits the input current to 500ma. if the application does not need input current limit, it can be disabled also. the aicr levels programmed by i 2 c and suitable for usb port and several ta types. charge current (i chg ) the charge current into the battery is determined by the power path sensing ron and icc setting by i 2 c. the voltage between the sys and bat pins is regulated to the voltage control by icc setting. (i cc x r on , r on : power path r on ) at rt9460, the r on is 35m and the fast-charge currents is set by the i 2 c interface from 1.25a to 3.125a per 125ma. constant voltage mode and settings the rt9460 enters constant voltage mode when the bats voltage is close to the output-charge voltage (v oreg ). in this mode, the charge current begins to decrease. for default settings (charge current termination is disabled), the rt9460 does not turn off and always regulates the battery voltage at voreg. however, once the charge current termination is enabled, the charger terminates if the charge current is below termination current (i eoc ) in constant-voltage mode. the charge current termination function is controlled by the i 2 c interface. after termination, a new charge cycle restarts when one of the following conditions is detected : ? the bats pin voltage falls below the v oreg - v rech threshold. ? vin power on reset (por). ? chg_en bit toggle or rst bit is set (via i 2 c interface). output charge voltage (v oreg ) the output-charge voltage is set by the i 2 c interface from 3.5v to 4.62v per 25mv. the default value is 4v (011001). termination current (i eoc ) if the charger current termination is enabled (te bit = ? 1 ? of reg0x01[3]), the end-of-charge current is determined by both termination current sense voltage (v eoc ) and power path sense resistor (r on ). general r on is 35m , ieoc is set by the i 2 c interface from 100ma to 450ma per 50ma. input voltage protection in charge mode during charge mode, there are two protection mechanisms against if input power source capability is less than the charging current setting. one is aicr and the other is minimum input voltage regulation. a suitable level of aicr can prevent vbus drop by the insufficient capability. as the aicr setting is not suitable, mivr will regulate the vbus in the setting level and sink the maximum current of power source. sleep mode (v in - v bats < v slp ) the rt9460 enters sleep mode if the voltage drop between the vin and bats pins falls below v slp . in sleep mode, the reverse blocking switch and pwm are all turned off. this function prevents battery drai n during poor or no input power source.
14 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. input over voltage protection when vbus rises above the input over voltage threshold, the switching charger stops charging and sets the fault status bits. the condition is released when vbus falls below ovp threshold. the switching charger then resumes charging operation. boost mode operation (otg) trigger and operation the rt9460 features usb otg support. when otg function is enabled, the synchronous boost control loop takes over the power mosfets and reverses the power flow from the battery to the vin pin. in normal boost mode, the vin pin is regulated to the level controlled by voreg[5:0] from 4.425v to 5.825 per 25mv. the boost provides up to 1a current to support other otg devices connected to the usb connector. output over voltage protection in boost mode, the output over voltage protection is triggered when the vin voltage is above the output ovp threshold. when ovp occurs, the boost converter stops switching and turns off immediately. output overload protection the rt9460 provides an overload protection to prevent the device and battery from damage when vin is overload. once overload condition is detected, the reverse blocking switch operates in linear region to limit the output current while the mid voltage remains in voltage regulation. if the overload condition lasts for more than 32ms, the rt9460 will recognize the overload fault condition and resets registers to the default settings. battery detection during normal charging the rt9460 provides a battery absent detection scheme to detect insertion or removal of the battery pack. the battery detection scheme is valid only when both te = 1 and batd_en = 1. during normal charging process, once the charge done condition is satisfied (v bats > v oreg - v rech and termination current is detected), the rt9460 turns off the pwm converter and initiates a discharge current (detection current) for a detection time period. after that, the rt9460 checks the bats voltage. if it is still above the recharge threshold, the battery is present and charge done is detected. if the bats voltage is below the recharge threshold, the battery is absent. thus, the rt9460 stops charging and the charge parameters are reset to the default values. the charge resumes after a period of tdet (2sec. typ.). jeita protection to enhance thermal protection of battery, jeita function is implemented in thert9460. jeita guideline was released in 2007. it includes warm and cool protection (cool section is between t1 and t2; warm section is between t3 and t4, see the figure as below). when battery's temperature is in warm or cool section, the rt9460 will reduce charging current (by a half of cc mode current). the rt9460 stop charging if temperature is lower than t1 or is higher than t4. thermal of battery can be monitored by ts pin. there are 4 sections should be implemented in jeita function. base on r hot and r cold , rt1 and rt2 can be determined by equation (1) and equation (2). (r hot mean that system trigger battery otp, r cold mean that system trigger battery low temperature protection.) r t1 = vpts x [ (1/ v t1 - 1/ v t4 )/(1 / r cold - 1 / r hot )] (1) r t2 = r t1 x [ 1 / (vpts / v t1 - r t1 / r cold - 1)] (2) temp. t1 t2 t3 t4 cc/2 cc charge current normal cool cold hot warm vts low vts high vpts r t1 r t2 r th vts
15 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 0 25 50 75 100 125 ambient temperature (c) maximum power dissipation (w) 1 t hermal 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 wl-csp-25b 2.52x2.52 package, the thermal resistance, ja , is 32.1 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) / (32.1 c/w) = 3.11w for wl-csp-25b 2.52x2.52 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. figure 1. derating curve of maximum power dissipation four-layer pcb layout considerations ? ? for agnd noise reduction, pgnd and agnd should connect directly at top layer. ? ? for agnd noise reduction, pgnd and agnd should be connected by ground plane at inner layer1. and this ground plane should be connected to system ground plane by via. ? ? vbus and vmid (capacitor gnd) should be connected to ic pgnd directly at top layer. ? ? the output inductor and bootstrap capacitor should be placed close to the rt9460 and lx pins.
16 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. figure 2. pcb layout guide 0603c 0603c 0603c 0603c pgnd pgnd agnd lx vin lx vin otg irq sda scl ceb bat bat vpts sys sys ts dm dp vddp boot mid ppct rl stat e d c b a 12345 adaptor input pgnd bat pgnd 2 5 2 0 l 0402c to sys top layer inner layer1 inner layer2 bottom layer
17 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. control register (control) i 2 c slave address : 0100101 addres s name bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0x03 device id vendor_id chip_rev reset value 0 1 0 0 0 0 0 0 read/write r r r r r r r r 0x00 control1 sel_ swfreq en_ stat stat boost pwr_ rdy otg_ pinp mivr reset value 0 1 0 0 0 0 0 0 read/write r/w r/w r r r r r r 0x01 control2 ieoc[2:0] higher_ ocp te iin_int hz opa_ mode reset value 0 1 0 0 0 0 0 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w 0x02 control3 voreg[5:0] otg_pl otg_en reset value 0 1 1 0 0 1 1 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w 0x04 control4 rst reserved reserved reserved reserved reserved reserved reserved reset value 0 0 0 0 0 0 0 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w 0x05 control5 sysuvp_ hw_sel otg_oc sys_min[1:0] iprec[3:0] reset value 1 0 0 1 0 0 1 1 read/write r/w r/w r/w r/w r/w r/w r/w r/w 0x06 control6 ichrg[3:0] en_oscss vprec[2:0] reset value 0 0 0 0 0 0 1 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w 0x07 control7 cc_jeita batd_en chip_en chg_en ts_hot ts_ warm ts_cool ts_cold reset value 0 0 1 1 0 0 0 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w 0x1c control8 reserved reserved reserved reserved reserved ppsensenode [2:0] reset value 1 0 0 1 1 1 0 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w 0x08 irq1 tsdi vinovpi wakeupi watchdogi reserved chterm_ tmri sysuvp batab reset value 0 0 0 0 0 0 0 0 read/write r r r r r r r r
18 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. address name bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0x09 irq2 chrvpi chbadi chbatovi chtermi chrchgi chtmri chtregi syswake upi reset value 0 0 0 0 0 0 0 0 read/write r r r r r r r r 0x0a irq3 bstvinovi bstoli bstlowvi reserved reserved reserved reserved reserved reset value 0 0 0 0 0 0 0 0 read/write r r r r r r r r 0x0b mask 1 tsdim vinovpim wakeupim watchdog im reserved chterm_ tmrim sysuvp im batabm reset value 0 0 0 0 0 0 0 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w 0x0c mask 2 chrvpim chbadim chbatov im chtermim chrchgim chtmrim chtregi m syswake upim reset value 0 0 0 0 0 0 0 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w 0x0d mask 3 bstvinov im bstolim bstlow vim reserved reserved reserved reserved reserved reset value 0 0 0 0 0 0 0 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w 0x0e control-dp dm chg_typ[2:0] iinlmtsel[1:0] chg_ 2det chg_ 1det chgrun reset value 0 0 0 1 0 1 1 0 read/write r r r r/w r/w r/w r/w r 0x21 control 9 reserved ppc_ ctrl_sel en_ ppctrl mivr_ enb mivr_lvl[3:0] reset val ue 0 1 0 0 0 0 0 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w 0x22 control 10 clr_dp dp_stat wt_fc[2:0] wt_prc[1:0] tmr_ pause reset val ue 0 0 0 0 0 0 0 0 read/write r/w r r/w r/w r/w r/w r/w r/w 0x23 control 11 aicr[4:0] reserved reset val ue 0 0 1 0 1 1 1 1 read/write r/w r/w r/w r/w r/w r/w r/w r/w
19 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. address name bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0x24 control 12 eoc_timer[1:0] wakeup_timer[2:0] wk_ timer_en irq_ pulse irq_rez reset value 0 0 0 0 0 0 0 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w 0x25 control 13 wdt_en reserved reserved twdtrst reserved reserved twdt[1:0] reset value 0 0 0 1 0 0 1 1 read/write r/w r/w r/w r/w r/w r/w r/w r/w 0x26 stat irq tshoti tswarmi tscooli tscoldi pwr_rdyi mivri reserved reserved reset val ue 0 0 0 0 0 0 0 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w 0x27 stat irq mask tshotim tswarmim tscooli m tscoldi m pwr_ rdyim mivrim reserved reserved reset val ue 0 0 0 0 0 0 0 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w
20 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. address name bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0x00 control 1 sel_ swfreq en_ stat stat boost pwr_ rdy otg_ pinp mivr reset value 0 1 0 0 0 0 0 0 read/write r/w r/w r r r r r r sel_swfreq the switching frequency selection bit (charger/otg) 0 : the switching frequency is 1.5mhz 1 : the switching frequency is 750khz en_stat 0 : disable stat pin function 1 : enable stat pin function stat charger status bit 00 : ready 01 : charge in progress 10 : charge done 11 : fault boost 0 : not in boost mode 1 : boost mode pwr_rdy power status bit 0 : input power is bad, vin > vovp or vin < vuvlo or vin < bats + vslp 1 : input power is good, uvlo < vin < vovp & vin > bats + vslp otg_pinp otg pin polarity 0 : otg input pin is low 1 : otg input pin is high mivr mivr status pin : 0 : mivr regulation is inactive 1 : mivr regulation is active 0x01 control 2 ieoc[2:0] higher_ ocp te iin_int hz opa_ mode reset value 0 1 0 0 0 0 0 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w ieoc eoc current level setting 000 : 100ma 001 : 150ma 010 : 200ma 011 : 250ma 100 : 300ma 101 : 350ma 110 : 400ma 111 : 450m a higher_ocp charger/otg ocp level selection 0 : ocp = 4.5a 1 : ocp = 6a te charge current termination detection and irq control 0 : disable charge current termination 1 : enable charge current termination
21 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. address name bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 iin_int iaicr setting bit 0 : decided by external otg pin, 500ma current limit when otg pin is low and 1a current limit when otg pin is high 1 : decided by i 2 c iaicr[4:0] and dpdm results, refer to reg0x0e hz 0 : not high impedance mode 1 : high impedance mode opa_mode 0 : charger mode 1 : boost mode 0x02 control 3 voreg[5:0] otg_pl otg_en reset value 0 1 1 0 0 1 1 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w voreg[5:0] battery regulation voltage / boost output voltage. 00 0000 : 3.50v / 4.425v 00 0001 : 3.52v / 4.45v 00 0010 : 3.54v / 4.475v ...... 01 1000 : 3.98v / 5.025 v 01 1001 : 4.00v / 5.05v 01 1010 : 4.02 / 5.075v ...... 10 0111 : 4.28v / 5.4v 10 1000 : 4.30v / 5.425v 10 1001 : 4.32v / 5.45v ...... 10 1110 : 4.42v / 5.575v 10 1111 : 4.44v / 5.6v ...... 11 0110 : 4.58v / 5.775v 11 0111 : 4.60v / 5.8v 11 1000 : 4.62v / 5.825v ...... 11 1111 : 4.62v / 5.825v otg_pl 0 : active at low level 1 : active at high level otg_en 0 : disable otg pin 1 : enable otg pin
22 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. address name bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0x03 device id vendor_id chip_rev reset value 0 1 0 0 0 0 0 0 read/write r r r r r r r r vendor_id vendor identification : richtek : 0100b chip_rev chip revision 0x04 control 4 rst reserved reserved reserved reserved reserved reserved reserved reset value 0 0 0 0 0 0 0 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w rst write : 1-charger in reset mode, 0-no effect, read : always get "0" 0x05 control 5 sysuvp_ hw_sel otg_oc sys_min[1:0] iprec[3:0] reset value 1 0 0 1 0 0 1 1 read/write r/w r/w r/w r/w r/w r/w r/w r/w sysuvp_hw_sel system uv protection selection bit 0 : switching is not turned off when system uvp 1 : switching is turned off when system uvp otg_oc over current protection threshold 0 : 0.5a 1 : 1a sys_min[1:0] system minimum regulation voltage 00 : 3.5v 01 : 3.6v 10 : 3.7v 11 : 3.8v iprec[3:0] 0000 : 100ma 0001 : 150ma 0010 : 200ma 0011 : 250ma 0100 : 300ma 0101 : 350ma 0110 : 400ma 0111 : 450ma 1000 : 500ma 1001 : 550ma 1010 : 600ma 1011 : 650ma 1100 : 700ma 1101 : 750ma 1110 : 800ma 1111 : 850m a
23 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. address name bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0x06 control 6 ichrg[3:0] en_osc ss vprec[2:0] reset value 0 0 0 0 0 0 1 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w ichrg[3:0] charging current setting (recommed to set reg0x1c [2:0] = 111) 0000 : 1.25a 0001 : 1.375a 0010 : 1.5a ?? 0110 : 2a ?? 1010 : 2.5a ?? 1110 : 3a 1111 : 3. 125a en_oscss enable signal of oscillator spread spectrum 0 : disable spread spectrum 1 : enable spread spectrum vprec[2:0] pre-charge voltage threshold 000 : 2v 001 : 2.2v 010 : 2.4v 011 : 2.6v 100 : 2.8v 101 : 3.0v ?... 111 : 3.0v 0x07 control 7 cc_ jeita batd_ en chip_en chg_ en ts_hot ts_warm ts_ cool ts_cold reset value 0 0 1 1 0 0 0 0 read/write r/w r/w r/w r/w r r r r cc_jeita charging current setting bit 0 : ichrg 1 : ichrg/2 batd_en battery detection when charge done 0 : disable battery detection 1 : enable battery detection chip_en chip enable bit 0 : chip is disabled 1 : chip is enabled chg_en charger enable bit : 0 : charger is disabled 1 : charger is enabled ts_hoit temperature status read bit 0 : normal temperature 1 : temperature is hot
24 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. address name bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 ts_warm temperature status read bit 0 : normal temperature 1 : temperature is warm ts_cool temperature status read bit 0 : normal temperature 1 : temperature is cool ts_cold temperature status read bit 0 : normal temperature 1 : temperature is cold 0x1c control 8 reserved reserved reserved reserved reserved ppsensenode [2:0] reset value 1 0 0 1 1 1 0 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w ppsensenode [2:0] power path current sensing adjustment 100 : default setting ?? 111 : recommended setting 0x08 irq 1 tsdi vinovpi wakeupi watchdogi reserved chterm_ tmri sysuv pi batabi reset value 0 0 0 0 0 0 0 0 read/write r r r r r r r r tsdi thermal shutdown fault. set if the die temperature exceeds the thermal shutdown threshold vinovpi vin over voltage protection 0 : normal 1 : vinovp is detected wakeupi wakeup timer fault 0 : normal 1 : wakeup timer is expired watchdogi watchdog timer fault 0 : normal 1 : watchdog timer is expired chterm_tmri eoc timer fault 0 : normal 1 : eoc timer is expired sysuvpi system uvp fault 0 : normal 1 : sysuvp is triggered batabi battery absence fault bit 0 : normal 1 : battery absence
25 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. address name bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0x09 irq 2 chrvpi chbadi chbato vi chterm i chrch gi chtmri chtregi syswak eupi reset value 0 0 0 0 0 0 0 0 read/write r r r r r r r r chrvpi charger fault. reverse protection (vin < bats + vslp) chbadi charger fault. bad adaptor (poor input source or vin < vuvlo) chbatovi charger fault. battery ovp chtermi charge terminated chrchgi recharge request (vbats < voreg ? vrech) chtmri charger fault. timer time-out chtregi charger warning. thermal regulation loop active syswakeupi battery voltage is high enough to wakeup system 0x0a irq 3 bstvino vi bstoli bstlow vi reserved reserved reserved reserved reserved reset value 0 0 0 0 0 0 0 0 read/write r r r r r r r r bstvinovi boost fault. vin ovp (vin > vin_bovp) bstoli boost fault. over load bstlowvi boost fault. battery voltage is too low 0x0b mask 1 tsdim vinovp im wakeupi m watchdo gim reserved chterm _tmrim sysuvp im batabim reset value 0 0 0 0 0 0 0 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w tsdim tsdi fault interrupt mask 0 : interrupt is not masked 1 : interrupt is masked vinovpim vin ovp fault interrupt mask 0 : interrupt is not masked 1 : interrupt is masked wakeupim wakeup timer interrupt mask 0 : interrupt is not masked 1 : interrupt is masked watchdogim watchdog timer interrupt mask 0 : interrupt is not masked 1 : interrupt is masked chterm_tmrim eoc timer interrupt mask 0 : interrupt is not masked 1 : interrupt is masked
26 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. address name bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 sysuvpim system uvp fault interrupt mask 0 : interrupt is not masked 1 : interrupt is masked batabim battery absence fault interrupt mask 0 : interrupt is not masked 1 : interrupt is masked 0x0c mask 2 chrvp im chbad im chbato vim chterm im chrch gim chtmri m chtreg im syswak eupim reset value 0 0 0 0 0 0 0 0 read/write r r r r r r r r chrvpim charger reverse protection interrupt mask 0 : interrupt is not masked 1 : interrupt is masked chbadim charger bad adaptor interrupt mask 0 : interrupt is not masked 1 : interrupt is masked chbatovim charger battery over voltage interrupt mask 0 : interrupt is not masked, 1 : interrupt is masked chtermim charge terminated interrupt mask 0 : interrupt is not masked 1 : interrupt is masked chrchgim charger recharge request interrupt mask 0 : interrupt is not masked 1 : interrupt is masked chtmrim charger timer timeout interrupt mask 0 : interrupt is not masked 1 : interrupt is masked chtregim charger thermal regulation loop active interrupt mask 0 : interrupt is not masked 1 : interrupt is masked syswakeupim system wakeup interrupt mask 0 : interrupt is not masked 1 : interrupt is masked
27 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. address name bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0x0d mask 3 bstvino vim bstoli m bstlow vim reserved reserved reserved reserved reserved reset value 0 0 0 0 0 0 0 0 read/write r r r r r r r r bstvinovim boost vin overvoltage interrupt mask 0 : interrupt is not masked 1 : interrupt is masked bstolim boost over load interrupt mask 0 : interrupt is not masked 1 : interrupt is masked bstlowvim boost low battery voltage interrupt mask 0 : interrupt is not masked 1 : interrupt is masked 0x0e control dpdm chg_typ[2:0] iinlmtsel[1:0] chg_ 2det chg_ 1det chgrun reset value 0 0 0 1 0 1 1 0 read/write r r r r/w r/w r/w r/w r chg_typ[2:0] charger type indication 000 : standard usb charger (sdp) 001 : sony charger -1 010 : sony charger -2 011 : apple charger (0.5a) 100 : apple charger (1a) 101 : nikon charger (1a) 110 : charging downstream port (cdp) (high current host/hub) 111 : dedicated charger (dcp) iinlmtsel[1:0] input current limit selection bit 00 : chg_typ[2:0] is applied and ignore iaicr[4:0] 01 : iaicr[4:0] is applied and ignore chg_typ[2:0] 10 : input limit is set to the higher level of iaicr[4:0] and chg_typ[2:0] results 11 : input limit is set to the lower level of iaicr[4:0] and chg_typ[2:0] results chg_2det the chg_2det bit is used to enable the secondary charger detection (to distinguish cdp and dcp). set this bit to 1 in order to enable charger detection. 0 : secondary charger detection is disabled 1 : secondary charger detection is enabled chg_1det the chg_1det bit is used to enable the primary charger detection and auto-detect charger type when vin plug in. toggle this bit value (set to 0 and then set 1) to re-enable charger detection. 0 : primary charger detection is disabled 1 : primary charger detection is enabled chgrun the chgrun bit is the charger detector status bit. it means the charger detection is running or not. 0 : charger detection is not running 1 : charger detection is running
28 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. address name bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0x21 control 9 reserved ppc_ ctrl_sel en_ ppctrl mivr_ enb mivr_lvl[3:0] reset value 0 1 0 0 0 0 0 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w ppc_ctrl_sel pin-ppctrl control by software (sw) or hardware (hw) 0 : controlled by sw 1 : controlled by hw en_ppctrl external power-path control signal. it works when ppc_ctrl_sel = 0 0: ppctrl pin internally pulled high to vsys 1: ppctrl pin internally pulled low to pgnd mivr_enb control the mivr regulation 0 : mivr regulation is enabled 1 : mivr regulation is disabled mivr_lvl[3:0] control the mivr regulation level 0000 : 4.0v 0001 : 4.25v 0010 : 4.5v 0011 : 4.75v 0100 : 7.0v 0101 : 7.5v 0110 : 8.0v 0111 : 8.5v
29 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. address name bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0x22 control 10 clr_dp dp_ stat wt_fc[2:0] wt_prc[1:0] tmr_ pause reset value 0 0 0 0 0 0 0 0 read/write r/w r r/w r/w r/w r/w r/w r/w clr_dp clear dp pin of 0.6v voltage source 0 : don't care 1 : release dp pin of 0.6v voltage source dp_stat dp pin status indication 0 : dp pin is pulled to 0.6v 1 : dp pin is released wt_fc[2:0] fast charge timer 000 : 4hrs 001 : 6hrs 010 : 8hrs 011 : 10hrs 100 : 12hrs 101 : 14hrs 110 : 16hrs 111 : timer disabled wt_prc[1:0] pre charge timer 00 : 30min 01 : 45min 10 : 60min 11 : timer disabled tmr_pause timer control bit 0 : timer is active 1 : timer is paused
30 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. address name bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0x23 control 11 iaicr[4:0] reserved reset value 0 0 1 0 1 1 1 1 read/write r/w r/w r/w r/w r/w r/w r/w r/w iaicr[4:0] average input current regulation (aicr) setting 0000x : 100ma 0001x : 150ma 0010x : 500ma 00110 : 600ma 00111 : 700ma ?... 01010 : 1a 01011 : 1.1a ?... 01111 : 1.5a ?... 10100 : 2a ?... 11110 : 3a 11111 : disable
31 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. address name bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0x24 control 12 eoc_timer[1:0] wake-up timer[2:0] wk_ timer_en irq_ pulse irq_ rez reset value 0 0 0 0 0 0 0 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w eoc_timer[1:0] the timer of back-charging time 00 : 0 min 01 : 30 min 10 : 45 min 11 : 60min wake-up timer[2:0] the periodically timer irq to awake 000 : 4s 001 : 8s 010 : 16s 011 : 32s 100 : 64s 101 : 2min 110 : 4min 111 : 8min wk_timer_en control the wake-up timer 0 : timer is disabled 1 : timer is enabled irq_pulse control the irq remind function 0 : the irq reminding is disabled 1 : the irq reminding is enabled. if the irq is triggered and no check action, it will be released for 2ms and triggered again irq_rez irq release control 0 : no action 1 : release irq pin status. it is auto reset to 0 when release is done 0x25 control 13 wdt_en reserved reserved twd trst reserved reserved twdt[1:0] reset value 0 0 0 1 0 0 1 1 read/write r/w r/w r/w r/w r/w r/w r/w r/w wdt_en control watch dog timer 0 : disable timer and reset 1 : enable timer twdtrst waiting timer to reset i 2 c setup after watchdog is asserted 0 : 200ms 1 : 500ms twdt[1:0] watch dog timer, from wdten is enabled to watchdog irq 00 : 1s 01 : 2s 10 : 4s 11 : 8s
32 ds9460-04 august 2017 www.richtek.com rt9460 ? copyright 2017 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. address name bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0x26 stat irq tshoti tswarmi tscoo li tscol di pwr_ rdyi mivri reserved reserved reset value 0 0 0 0 0 0 0 0 read/write r r r r r r r r tshoti status irq : interrupt is triggered when ts is entering or exiting hot region tswarmi status irq : interrupt is triggered when ts is entering or exiting warm region tscooli status irq : interrupt is triggered when ts is entering or exiting cool region tscoldi status irq : interrupt is triggered when ts is entering or exiting cold region pwr_rdyi status irq : interrupt is triggered when pwr_rdy is from bad to good or from good to bad mivri status irq : interrupt is triggered when mivr loop is from inactive to activate or from active to inactive 0x27 stat mask tshotim tswarm im tscoo lim tscol dim pwr_ rdyim mivrim reserved reserved reset value 0 0 0 0 0 0 0 0 read/write r/w r/w r/w r/w r/w r/w r/w r/w tshotim ts in hot interrupt mask 0 : interrupt is not masked 1 : interrupt is masked tswarmim ts in warm interrupt mask 0 : interrupt is not masked 1 : interrupt is masked tscoolim ts in cool interrupt mask 0 : interrupt is not masked 1 : interrupt is masked tscoldim ts in cold interrupt mask 0 : interrupt is not masked 1 : interrupt is masked pwr_rdyim pwr_rdy interrupt mask 0 : interrupt is not masked 1 : interrupt is masked mivrim mivr interrupt mask 0 : interrupt is not masked 1 : interrupt is masked
33 ds9460-04 august 2017 www.richtek.com rt9460 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 ci rcuitry entirely embodied in a richtek product. information furnish ed by richtek is believed to be accurate and reliable. however, no respon sibility 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 25b wl-csp 2.52x2.52 package (bsc) min max min max a 0.525 0.625 0.021 0.025 a1 0.200 0.260 0.008 0.010 b 0.290 0.350 0.011 0.014 d 2.470 2.570 0.097 0.101 d1 e 2.470 2.570 0.097 0.101 e1 e symbol dimensions in millimeters dimensions in inches 2.000 0.079 2.000 0.079 0.500 0.020

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