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t c7761 wbg 2014- 05- 15 1 toshiba c d mos integrated circuit silicon monolithic t c7761 wbg qi compliant wireless power receiver controller ic 1. outline the TC7761WBG is wireless power receiver (r x ) ic for qi low power v1.1 compliant of wireless power consortium (wpc). the TC7761WBG includes a rectifier circuit, a digital control circuit, a modulation circuit, a regulator circuit which controls the supply voltage to the load , and a load switch controller for supply selector. a digital control circuit realizes heat reduction and improvement of stabilization for load changes. the ic includes all rx function s needed to construct a standalone wireless power system. the integrated load switch driver for external loadswitch allows to bypass the wireless power function when a usb or ac power source is connected to the mobile device. 2. applications mobile devices (smartphone, tablet), battery pack, mobile accessory 3. features ? full bridge rectifier circuit auto switch for 3 modes : synchrono us rectification / diode rectification / diode bridge low on resistance : hi side 45m (typ.) / low side 30m (typ.) under voltage lockout ( uvlo ) / over voltage detection ( ovp ) function 5v - output ldo maximum out put current : 1.0a 2 step over current detection ( ocl ) function ? qi low power v1.1 compliant ? foreign object detection (fod) function ? external load switch driver for supply select or current drive type startup function under voltage lockout ( uvlo ) / over voltage detection ( ovlo ) function thermal shutdown function (tsd) ? package : s - xflga28 - 0304- 0.50- 001 (2.40mm * 3.67mm *0 . 5 mm , 0.5mm pitch ) s - xflga28 - 0304 - 0.50- 001 this product has a mos structure and is sensitive to electrostatic discharge. when handling this product, ensure that the environment is protected against electrostatic discharge by using an earth strap, a conductive mat and an ionizer. ensure also that the ambient temperature and relative humidity are maintained at reasonable levels.
t c7761 wbg 2014- 05- 15 2 4. block diagram figure 4 . 1 block diagram rectifier controller digital controller 4 . 5 v ldo ngd uvlo por tsd ovp 4 ldo controller current sense vrect _ sense ocl vout _ sense iout _ sense vref vthd _ sense vrect _ sense iout _ sense vout _ sense vthd _ sense fod _ sense 10 osc tsd uvlo ovp ask modulator clump controller vdd 45 fod _ sense por vdd 45 vref vref mux sw _ uvlo sw _ ovlo external load switch driver i 2 c interface 10 bit adc efuse ac 1 ac 2 pvdd pgnd com 1 com 2 clmp 1 clmp 2 stat xen scl sda vthd fod vpp sw _ en sw _ det vout vdd 45 2
t c7761 wbg 2014- 05- 15 3 5. pin assignment 1 2 3 4 a pgnd pgnd pgnd pgnd b ac2 ac2 ac1 ac1 c clmp2 pvdd pvdd clmp1 d vout vout vout vout e com2 sda scl com1 f vdd45 vpp sw_en sw_det g fod x en stat vthd (top view) figure 5 . 1 pin assignment (top view) note : the pin configuration figure is indicated that package ball side is located on the back and indicating pins from the surface view . index
t c7761 wbg 2014- 05- 15 4 6. pin function table 6 . 1 pin function pin number pin symbol i/o description a1, a2 a3, a4 pgnd - power ground connect to common ground (gnd). b1, b2 ac2 i antenna terminals for receiver 2 b3,b4 ac1 i antenna terminals for receiver 1 c1 clmp2 o clamp terminal for over voltage protection 2 open drain terminal. connect capacitor of 0.47 f to ac2. c2, c3 pvdd - rectifier output and power supply terminal output of bridge rectifier circuit and ic power supply terminal. connect smoothing capacitor between pvdd and p gnd. c4 clmp1 o clamp terminal for over voltage protection 1 open drain terminal. connect capacitor of 0.47 f to ac1. d1, d2 d3, d4 vout o 5v ldo output terminals connect capacitor of more than 1.0 f to gnd. e1 com2 o capacitor connect for ask modulation 2 open drain terminal. connect capacitor to ac2. e2 sda i/o i 2 c data i/o terminal for toshiba tests open drain terminal. c onnect to gnd. e3 scl i i 2 c clock input terminal for toshiba tests c onnect to gnd. e4 com1 o capacitor connect for ask modulation 3 open drain terminal. connect capacitor to ac2. f1 vdd45 o 4.5v - ldo output terminal 4.5v - ldo output terminal for internal circuit. connect capacitor of more than 0.1 f to gnd. f2 vpp i efuse writing terminal short to vdd45 in normal use. f3 sw_en o external load switch drive terminal connect sw_en to a gate of p - ch mosfet for load switch. please open when you do not use it. f4 sw_det i external load switch power supply monitor terminal it monitors input power supply of load switch. connect sw_det to second input power supply. please connect gnd when you do not use i t. g 1 fod i offset terminal for rx loss loss offset terminal for fod connect resistor to gnd. g 2 xen i ldo enable input terminal when the terminal is "open" or l level, ldo is tuned on. when the terminal is h level, ldo is turned off. g 3 stat o status output terminal open drain terminal. connect pull - up resistor. g 4 vthd i thermal detection terminal thermistor connect terminal to monitor external temperature. connect ntc thermistor to gnd. please connect resistance (51k ) when you do not use it.
t c7761 wbg 2014- 05- 15 5 7. equivalent circuit s for input/output/power supply terminal s 7.1 power supply terminal table 7 . 1 equivalent circuit s for power supply terminal s note : equivalent circuits may be simplified to illustrate circuits. pin name equivalent circuit pvdd - pgnd 7.2 input/output terminal table 7 . 2 equivalent circuit s for input/output terminal s note : equivalent circuits may be simplified to illustrate circuits. pin name equivalent circuit sda pvdd pgnd pgnd sda internal circuit internal circuit
t c7761 wbg 2014- 05- 15 6 7.3 input terminal table 7 . 3 equivalent circuit s for input terminal s note : equivalent circuits may be simplified to illustrate circuits. pin name equivalent circuit vpp sw_det ac1 ac2 scl xen vthd fod vpp pgnd pvdd ac 1 ac 2 pgnd internal circuit internal circuit pgnd scl internal circuit xen pgnd internal circuit 100 k sw_det pgnd vdd45 pgnd vthd fod internal circuit
t c7761 wbg 2014- 05- 15 7 7.4 output terminal table 7 . 4 equivalent circuit s for output terminal s note : equivalent circuits may be simplified to illustrate circuits. pin name equivalent circuit vdd45 vout com1 com2 clmp1 clmp2 vdd45 pgnd pvdd pvdd clmp1 clmp2 pgnd internal circuit pvdd vout pgnd pvdd com 1 pgnd internal circuit com 2 internal circuit
t c7761 wbg 2014- 05- 15 8 table 7 . 5 equivalent circuit s for output terminal s note : equivalent circuits may be simplified to illustrate circuits. pin name equivalent circuit sw_en stat sw_en pgnd internal circuit pgnd stat internal circuit
t c7761 wbg 2014- 05- 15 9 8. functions / operation description 8.1 general outline of wireless power system qi compliant wireless power system consists of the first side (tx) which transmits power and the second side (rx) which receives power. p ower is transmitted by adjoining coils included in tx and rx and by sharing and combining flux. rx controls the power by monitoring receiving power and sending feedback signal to tx. tx controls the power by controlling transmitting power with feedback sig nal which is received from rx. configuration example of wireless power system is shown in figure 8.1 . communication signal from rx to tx is transmitted (modulated) by ask modulation. the communication rate and its packet in this communication are defined by qi compliant. communication rate is 2kbps. packets are id, identification signal , error information, receive power, and stop signal.tx stops its operation in normal mode. it is powe red on intermittently and confirms the existence of rx on the tx pad. when tx recognizes rx and succeeds the identification, transmit operation starts. tx continues transmit operation until tx cannot recognize the existence of rx or receives transmit stop signal from rx. figure 8 . 1 general outline of wireless power system 8.2 general outline of wireless power rx system the TC7761WBG includes a rectifier circuit which smoothes necessary coil current for wireless power system, a digital control circuit, a modulation circuit which communicates between rx and tx, a regulator circuit which controls the load su pply voltage, and a load switch control circuit which switches wired and wireless supply input. a wireless power system can be constructed easily without control of mcu because the TC7761WBG includes a digital control circuit which can operate in standalon e mode. the digital control circuit corresponds to wpc v1.1 and transmits the received power from rx to tx after some calculations. by using the TC7761WBG as rx, the tx can manage received power of the rx and a wireless power system can be constructed incl uding fod detection. configuration example of rx when wireless feeding and ac ad a pter are input is shown in the figure 8.2 . in the figure 8.2 , the TC7761WBG controls wireless feeding, detects wired ac ad a pter, and selects input power for load supply. when connection of ac adopter is detected, the TC7761WBG stops controlling wireless feeding and starts load supply through the load switch. wireless power system is controlled only when wired connection is not detected. tx coil tx pad rx coil dc input dc output communication adjoin rx pad power
t c7761 wbg 2014- 05- 15 10 figure 8 . 2 general outline of rx with the TC7761WBG 8.3 control of TC7761WBG 8.3.1 basic operation the TC7761WBG incorporates the digital control circuit to realize communication with tx. the TC7761WBG starts qi compliant communication when receieved power form tx. a fter a certain period of time with pvdd is no less than 7v at power transfer phase, ldo can be turned on only at the time of stat=l, ldo turns on only when stat and xen are l . figure 8.3 shows basic operation sequence using xen signal by external control figure 8 . 3 basic operation (using xen control) - + ac adapter sw_det sw_en com1 ac1 ac2 com2 vout pvdd xen scl sda pgnd 5v output TC7761WBG rx coil outside load switch pvdd vout xen stat 5 v uvlo (n- ch ope n drain ou tpu t ) l end power transfer ( ept ) after ldo off ept transmit ept transmit external control of xen ldo on l 7 v xen = l ldo automatic start after ldo off ept transmit
t c7761 wbg 2014- 05- 15 11 8.4 control state machine of wireless power the state machine of wireless power with the TC7761WBG consists of shutduwn mode , disable mode , startup mode output mode and ovp mode. wireless power system starts operation when tx coil and rx coil are adjoined without wired connection. the state transition diagram of the wireless feeding contr ol of the TC7761WBG is shown in the figure 8.4 . the operation state of each circuit in each mode is shown in the table 8.1 . figure 8 . 4 state transition diagram of TC7761WBG wireless power supply control startup mode disable mode shutdown mode freq_det phase ping phase config&id phase vrect_setup phase standby phase output mode ldo mode ocl mode ovp mode sw_uvlo detection sw_uvlo release uvlo release uvlo detection or ept ldo enable ldo disable or uvlo deteciont or ept timeout ovp detection ovp detection uvlo detection regular frequency detection transmitting complete vrect is stabilized over load normal load transmitting complete
t c7761 wbg 2014- 05- 15 12 table 8 . 1 operating condition for each mode w ireless charge control mode rectifier circuit p ackets (header values) vout output uvlo tsd stat output shutdown d iode bridge rectification - off v alid i nvalid hi - z disable d iode bridge rectification + rect_clamp - off i nvalid i nvalid hi - z startup freq_det d iode rectification na off v alid v alid hi - z ping d iode rectification 01h off v alid v alid hi - z config&id d iode rectification 71h, 51h off v alid v alid hi - z vrect_setup d iode rectification 03h, 04h off v alid v alid hi - z standby d iode rectification 03h, 04h off v alid v alid l ouput ldo d iode rectification or synchronous rectification 03h, 04h 5v v alid v alid l ocl d iode rectification or synchronous rectification 03h, 04h d epending on load v alid v alid l ovp d iode bridge rectifier + rect_clamp 03h, 04h off v alid v alid hi - z 8.4.1 shutdown mode shutdown mode is the status with non detection of wired power supply and wireless power supply. the detection judgment whether wireless power supply is on or not is done by monitoring pvdd terminal voltage (vrect). when the vrect is below uvlo release voltage, TC7761WBG enters shutdown mode . in shutdown mode , the rectifier circuit work as a diode bridge rectifier. at this time, all mosfets are off and the diode bridge rectifies through the mosfet body diodes. the digital control circuit, communication circuit and regulator circuits are stopped. when the uvlo is released, TC7761WBG starts to operate the wireless power supply control and goes to startup mode . 8.4.2 disable mode di sable mode is the status when TC7761WBG detects a wired power supply. the wireless power supply is stopped. when the TC7761WBG detects a wired connection, the rect_clamp function becomes a vailable to prevent providing wireless power by error. 8.4.3 startup mode startup mode is the status when TC7761WBG detects wireless charging power, in which it certificates with tx and stabilize vrect. the status has 5 phases which automatically transit in the following sequen ce; freq_det phase , ping phase , config&id phase , vrect_setup phase and standby phase . in startup mode the rectifier circuit works as diode rectifier in which the low - side mosfet is fixed to off and only the high - side mosfet works. after ldo works, the phase shifts to output mode . (1) freq_det phase in freq_det phase , TC7761WBG determines if tx is compliant to qi product. after uvlo is released, TC7761WBG starts detection of frequency that is input to ac1 and ac2. when the range of the frequency is from 85 khz to 2 86 khz, TC7761WBG considers that the frequency is stable. the m inimum time at regular operating is 0.7 ms and the time at abnormal operating is 3 ms. after confirming both the proper frequency and frequency stability, tc7716wbg shifts to ping phase .
t c7761 wbg 2014- 05- 15 13 (2) ping phase in ping phase , TC7761WBG notifies detection of wireless power supply to tx. after 28 ms have elapsed in this phase, TC7761WBG measure vrect to determine received power and send a packet including header (01h) and the result of received power. after that, TC7761WBG automatically shifts to config&id phase . (3) config&id phase in config&id phase , TC7761WBG notifies rx information to tx. after 7 .5 ms have ela psed in this phase, TC7761WBG packet including header (71h), wpc version, maker code and serial code. subsequently, after 7 .5 ms, send a packet included header (51h), received power and timing code TC7761WBG measured. then, TC7761WBG automatically shifts t o vrect_setup phase . (4) vrect_setup phase in vrect_setup phase , vrect is converged to its target value. after 7 .5 ms have elapsed in this phase, TC7761WBG calculates the error code. after 1 ms, TC7761WBG sends a packet including header (03h) and control error packet(cep) of the error code. subsequently, after 40.5 ms, the tc776 1wgb calculates received power and sends packet including header (04h) and received power. in this mode, the sending cycle of the error code is 62 ms. the sending cycle of the received power is one time per 29 sending cycles of the cep . if the cep continue s twice, TC7761WBG makes judgment that vrect is stable, and switches stat to l. after that, TC7761WBG shifts to standby phase . (5) standby phase sta ndby phase is the status until ldo works. when ldo works, TC7761WBG shifts to output mode . it is po ssible to select ldo start - up from the following settings; x en terminal or automatic startup by efuse setting. if the ldo doesnt work within 190 ms, TC7761WBG shifts to shutdown mode . 8.4.4 output mode in the output mode , TC7761WBG provides power received from wireless power supply to the load. the output mode has 2 modes; l do mode that provides 5v and ocl mode that works with a 2 step constant current limit. if the output current is over 250 ma, rectifier circuit shifts to synchronous rectifier mode in this mode. if the output current is below 220 ma, rectifier circuit shifts to diode rectifier mode. in this mode, the sending cycle of the cep is 192.5 ms. the sending cycle of the received power is one time per 8 sending cycles of the cep . if the vrect is over 7v and after cep are sent twice, TC7761WBG switches stat to l and mov es to the standby phase. (1) ldo mode in ldo mode , vrect generated by wireless power supply passes through the built - in ldo and give out a 5v constant voltage. the maximum current is set to 1.0a and ocl current (iocl) is set to 1.3a .
t c7761 wbg 2014- 05- 15 14 (2) ocl mo de ocl mode is the status when the output current is limited by the 2 step ocl function. the 2 step ocl is a function in which the TC7761WBG switches iocl according to vout. when vout is over 2.8 v, iocl is set to 1.3a. when vout is below 2.5 v, iocl is se t to 0.35a. if vout is over 2.8 v with iocl = 0.3 5 a, iocl is reconfigured to 1.3a. figure 8.5 shows the v - i characteristic. figure 8 . 5 ocl function and v - i characteristic of ldo 8.4.5 vrect automatic switching function the vrect automatic switching function sets the voltage of vrect is automatic ally according to the output current. TC7761WBG divides the status of output current below table 8.2 . it is possible to reduce heat by reduction of difference between input and output voltage at heavy load and to reduce output voltage variations by controlling vrect at load change. table 8 . 2 iout C vrect setting voltages o utput current vrect setting voltage less than 100ma 7.05 to 7.21v more than 100ma less than 200ma 6.25 to 6.41v more than 2 0 0ma less than 400ma 5.5 to 5.66v more than 400ma 5.1 to 5.25v 8.4.6 ovp mode ovp mode is the status that wpt_ovp function is powered by the wireless power supply. this function is to control the overvoltage of vrect by over voltage detection function of vrect and rect_clamp function. if vrect exceeds 15 v, TC7761WBG judges it as an over voltage. in such a case the TC7761WBG connects ac1 and ac2 to gnd through the capacitors by swit ching clmp1 and clmp2 from hi - z to gnd. the rx coil current flows through the capacitors, so that TC7761WBG can reduce the value of vrect. wpt_ovp function has a latching function that is reset through a uvlo condition. iout vout 5 . 0 v 2 . 8 v 2 . 5 v 350 ma 1300 ma 0
t c7761 wbg 2014- 05- 15 15 8.4.7 operation stop two methods can be used t o stop the wireless power supply operation : ept (end power transfer) messages and the communication timeout. when tc776 1 wbg activates any of its protection functions ( ovp, ldo off, and timeout ), it transmits an ept message to the tx . the tx then stops its power transmission. the communication timeout means that the tx does not receive any packet which tc776 1 wbg transmitted for a fixed period. then the tx stops power transmission automatically .
t c7761 wbg 2014- 05- 15 16 9. descriptions of functional details 9.1 communicatio n function of the wireless power system in the startup mode, when the uvlo is released and the frequency of rectifier is the range of 85 khz to 28 6 khz, the input is judged normal and communication (p ing phase) of the wireless power system automatically sta rts. 9.1.1 ask modulation c apacitors are connected between com1 and ac1 and between com2 and ac2. TC7761WBG communicate with tx by ask modulation. t he coil current is overlapped with the signals that tc7761 controls capacity load. figure 9 . 1 c onnection diagram of ask modulation + + ls cs cd ac1 ac2 tx portion rx portion + com1 com2 ccm ccm + rectifier ask modulation
t c7761 wbg 2014- 05- 15 17 9.1.2 c ommunication protocol (1) bit encoding scheme bit chart of wpc communication is as follows. figure 9 . 2 example of the differential bi - phase encoding (wpc volume 1:low power, part 1 interface definition) (2) byte encoding scheme byte chart of wpc communication is as follows. start bit: "zero", stop bit: one . the order of the data bits is lsb first. figure 9 . 3 example of the asynchronous serial format (wpc volume 1:low power, part 1 interface definition) (3) packet structur e packets of wpc communication consist of four parts; preamble, header, message, and checksum. preamble: it sends 11bit (default) of one continuously. header: it indicates the kind of packet and specifies the size of the massage that will be sent next. message: it sends the data of each packet type. checksum: it calculates the xor of header and message. checksum= header + message(0) + message(1) + + message (last) figure 9 . 4 packet format (wpc volu me 1:low power, part 1 interface definition) t clk= 0.5 4% [ms]
t c7761 wbg 2014- 05- 15 18 9.1.3 communication packets the TC7761WBG transmits each packet according to the next timing. ? p ing phase (1) signal strength packet (01 h) table 9 . 1 strength packet signal strength value : i t indicates the strength of the combinatnion between primary side and secondary side1, which is calcurated with moniroing vrect. ? config & id phase (2) i dentification packet (71 h) table 9 . 2 identification packet major version : fixed to 01h minor version : fixed to 01h manufacturer code : it indicates manufacture code. t he code of toshiba is 0033h . ext : fixed to ext= 0 basic device identification : it indicates the individual device id. packet header b7 b6 b5 b4 b3 b2 b1 b0 signal strength packet 01h b0 signal strength value packet header b7 b6 b5 b4 b3 b2 b1 b0 i dentification packet 71h b0 major version minor version b1 (msb) manufacturer code b2 (lsb) b3 ext (msb) b4 basic device identifier b5 b6 (lsb)
t c7761 wbg 2014- 05- 15 19 (3) configuration packet (51h) table 9 . 3 configuration packet power class : 0 0 h maximum power : 0a h (5w) prop : 00h count : 00h window side : 04h window offset : 01h ? vrect_setup phase / standby phase (4) control error packet (03h) table 9 . 4 control error packet (5) received power packet (04h) table 9 . 5 received power packet rece i ved power value: it indicates received power including fod compensation. packet header b7 b6 b5 b4 b3 b2 b1 b0 configuration packet 51h b0 power class maximum power b1 reserved b2 prop reserved count b3 window size window offset b4 reserved packet header b7 b6 b5 b4 b3 b2 b1 b0 control error packet 03h b0 control error value packet header b7 b6 b5 b4 b3 b2 b1 b0 received power packet 04h b0 received power value
t c7761 wbg 2014- 05- 15 20 (6) end power transfer packet (0 2 h) table 9 . 6 end power transfer packet end power transfer value: signal of end power transfer is transmitted in the condition of the table 9. 7 . table 9 . 7 end power transfer value reason value condition unknown 00h l ow voltage of vout (vout<4.4v) charge complete 01h when ldo turns off if xen= h or en_ldo= 0 at t ime out that ldo doesn't work in standby phase. internal fault 02h u nused over temperature 03h internal and external over temperature detection over voltage 04h u nused (note 1) over current 05h a t the detection of over current limitation battery failure 06h a t the detection of vout overvoltage (vout>5.6v) reconfigure 07h u nused no response 08h w hen vrect deviated from the setting voltage range at constant time note 1 : tc7761 wbg does not transmit ovp because it has rect_clamp function. packet header b7 b6 b5 b4 b3 b2 b1 b0 end power transfer packet 02h b0 end power transfer value
t c7761 wbg 2014- 05- 15 21 9.2 rectifier circuit 9.2.1 rectifier modes the rectifier circuit has 3 modes of the synchronous rectification, the diode rectification and the diode bridge. TC7761WBG automatically switches the modes. in shutdown mode, the rectifier operates in the diode bridge mode. in this mode, all mosfets are fixed to off and the rectifier operates by the body diode. in startup mode, the rectifier operates in the diode rectifier m ode. in this mode, low side mosfets are fixed to off. the rectifier operates by turning on and off only the high side mosfets. in output mode, when the output current becomes 250ma or more, the rectifier circuit operates in the synchronous rectification m ode by turning on and off all mosfet. in the synchronous rectification mode, when the output current decreases to 220ma or less, the rectifier circuit operates in the diode rectifier mode. table 9 . 8 rectifier modes t he condition of vrect voltage l ight load mode (o u tput current is below 220ma. (note) ) n ormal mode (output current is over 250ma. (note) ) vrect < uvlo diode bridge mode - vrect uvlo d iode rectification mode s ynchronous rectification mode n ote: 30mv hysteresis 9.2.2 rect_clamp function rect_clamp function suppresses the over voltage of vrect. rx coil current, which has flown in the rectifier circuit by making a circuitry of f igure 9 . 5 , flows in the capacity load. and it suppresses the rise of vrect. figure 9 . 5 c onnection diagram of clamp circuit + ls cs ac1 ac2 + clp clp clmp1 clmp2 + rectifier circuit clamp control circuit
t c7761 wbg 2014- 05- 15 22 9.3 fod function fod function is to calculate losses of received power. tc 7761wbg can revi s e the received power by the resistance of the fod terminal. 9.4 thermal detection function external temperature is monitored by connecting the ntc thermistor to vthd terminal. recommended thermistor is equivalent of the semitec503ft. figure 9 . 6 c onnection diagram of thermal detection circuit 9.5 outside load switch control circuit outside load switch control circuit monitors the voltage of sw_det terminal and selects the wireless power output or usb input (ac adopter) by outside load switch . when secondary input power is connected to sw_det terminal, below control is performed by the voltage of sw_det terminal. table 9 . 9 outside load switch control t he conditions of sw_det outside load switch t he voltage of s w_en clamp circuit ldo of the rectifier circuit wpc operation sw_det <4v off t he higher voltage of sw_det or vout. off on a vailable 5.75v sw_det 4v on 0v on off s top sw_det >5.75v off sw_det, voltage on off s top adc vthd 40 k 1 . 5 v
t c7761 wbg 2014- 05- 15 23 9.6 protection functions 9.6.1 under voltage lockout (uvlo) function under voltage lockout (uvlo) function avoids the error which is caused by low voltage of pvdd terminal (vre c t). detection condition of uvlo function is that the voltage of vrect falls below 3.8v (typ.). uvlo function is released when the voltage of vrect exceeds 4.0v (typ.). in operating uvlo function, output of ldo turns off and stat terminal outputs hi - z. 9.6.2 over voltage detection (wpt_ovp) function over voltage detection (wpt_ovp) function avoids the error which is caused by high voltage of pvdd terminal. detection condition of wpt_ovp function is that the voltage of pvdd exceeds 15v (typ.). when wpt_ovp function operates, output of ldo is turned off and the clamp circuit of the rectifier is turned on. when wpt_ovp is detected, the voltage of pvdd terminal falls and wireless power operation stops because the output of internal detection signal is latched. wpt communication also stops. 9.6.3 over current detection (ocl) function over current detection (ocl) function suppresses the output current of ldo. the detection condition of ocl function is that the current exceeds the output current limited by the voltage of vout (refer to the figure 8.5 ). in ca se the ocl detection time is 4 ms (typ.) or more, transmitting power is finished by transmitting ept signal (0 5 h:over current). ocl detection current is 1.3a(typ.). 9.6.4 thermal shutdown (tsd) function thermal shutdown (tsd) function avoids the ic destruction, w hich is caused by rising the internal temperature. the detection condition of tsd function is that the internal temperature exceeds 150c (typ.). when tsd is detected, the output of ldo is turned off. in case the internal temperature falls below 130c (typ .), tsd function is released automatically and ldo is turned on. in case the tsd detection time is 200ms or more, output of ldo turns off and transmitting power is finished by transmitting ept signal (03h:over temperature). 9.6.5 external over temperature prot ection (otp) function external over temperature protection (otp) function avoids the ic destruction, which is caused by rising temperature, by monitoring the voltage of the external thermistor. the detection condition of otp function is that the voltage of the external thermistor exceeds the voltage configured by set_ovtext register. in case the otp detection time is 1ms or more, output of ldo turns off and transmitting power is finished by transmitting ept signal (03h:over temperature) 9.6.6 select control of external power (sw_uvlo/sw_ovlo) function sw_uvlo/sw_ovlo function selects the wireless power output and the external power input with the external load switch by monitoring the voltage of sw_det terminal. when the voltage of sw_det terminal is less than 4.0v (typ.), sw_uvlo function turns off the external load switch and selects the wireless power output. when the voltage of sw_det terminal rises to the voltage of sw_uvlo detection voltage or more, wireless power output is turned off by selecting the exte rnal power input and tuning on the external load switch. sw_ovlo function turns off the external load switch when the voltage of sw_det terminal is 5.75v (typ.) or more. it does not output the wireless power. 9.6.7 abnormality detection for ldo output function abnormality detection for ldo output function detects abnormal operation by monitoring the output voltage of vout. when the voltage of vout falls below 4.4v (typ.) for 3 .5 s or more, output of ldo turns off and transmitting power is finished by tra nsmitting ept signal (00h:unknown). when the voltage of vout exceeds 5.6v (typ.) for 64ms or more, output of ldo turns off and transmitting power is finished by transmitting ept signal (0 6 h:battery failure).
t c7761 wbg 2014- 05- 15 24 10. a bsolute maximum ratings (ta = 25 c) ta ble 10. 1 a bsolute maximum ratings c haracteristics s ymbol r ating u nit remarks s upply voltage vrect max - 0.3 to 18 v (note 1) i nput voltage (1) v i1 - 0.3 to 18 v (note 2) i nput voltage (2) v i2 - 0.3 to 30 v (note 3) i nput voltage (3) v i3 - 0.3 to 8 v (note 4) i nput voltage ( 4 ) v i4 - 0.3 to 5.6 v (note 5) o perating temperature t opr - 40 to 85 c j unction temperature t j 150 c storage temperature t stg - 55 to 150 c note the absolute maximum ratings of a semiconductor devices are a set of ratings that must not be exceeded, even for a moment. do not exceed any of these ratings. exceeding the rating(s) may cause the device to break down, damage, and may result injury by explosion or combus t ion. please use the ic wi t hin the specified operating ranges. note pgnd=0v note 1: apply to pvdd terminal note 2: apply to ac1, ac2, com1, com2, clmp1 and clmp2 terminals note 3: apply to sw_en and sw_det terminals note 4: apply to vpp terminal note 5: apply to terminal except above terminals
t c7761 wbg 2014- 05- 15 25 11. electrical characteristics 11.1 dc characteristics common circuit, digital controller table 11 . 1 dc characteristics common circuit, digital controller ( unless otherwise specified, vrect = 7v, pgnd = 0v, sw_det = 0v, ta = 25c ) characteristics symbol test condition min typ. max unit terminal operation voltage v ope 3.7 - 15 v pvdd uvlo detection voltage v uvlo_on vrect = 7v to 0v 3.6 - - v pvdd uvlo release voltage v uvlo_off vrect = 0v to 7v - - 4.2 v pvdd quiescent current i cc vrect = 7v ac1 = ac2 = open 5v ldo off - 2.5 6.0 ma pvdd input voltage(1) high level v ih 1 1.4 - - v xen low level v il 1 - - 0.4 input current(1) high level i ih1 v ih1 = v out45 20 - 75 a xen low level i il1 v il1 = gnd - 0.6 - 0.6 output voltage low level v ol1 i out = - 1ma 0 - 0.4 v stat vdd45 voltage vdd45 4.25 - 4.75 v vdd45 oscillator frequency f clk 3.84 4.0 4.16 mhz tsd detection temperature t tsd_on 135 150 165 c tsd release temperature t tsd_off 120 - - c 11.2 dc characteristics rectifier, modulator table 11 . 2 dc characteristics rectifier, modulator ( unless otherwise specified, vrect = 7 .0v, pgnd =0v , sw_det = 0v, ta = 25 c ) characteristics symbol test condition min typ. max unit terminal rectifier mosfet on- resistance high - side r onh_ac i ds = - 100ma - 45 - m ac1, ac2 low - side r onl_ac i ds = 100ma - 30 - clamper mosfet on- resistance r on_clmp i ds = 100ma - - 1.5 clmp1, clmp2 modulator output resistance 1 r com1 com2 open r esistance between c om1 and pgnd 45 - 65 com1 modulator output resistance 2 r com 2 com1 open r esistance between com2 and pgnd 45 - 65 com2
t c7761 wbg 2014- 05- 15 26 11.3 dc characteristics 5v ldo table 11 . 3 dc characteristics 5v ldo ( unless otherwise specified, vrect = 7.0v, pgnd = 0v , sw_det = 0v, ta = 25 c ) characteristics symbol test condition min typ. max unit terminal 5v ldo output voltage accuracy accv out ldo mode i out = 10ma - 2 - 2 % vout 5v ldo ocl current i ocl1 vout = 5v, set_ocl=11b 1.1 1.3 1.5 a vout 5v ldo short current i ocl 2 vout = 0v, set_ocl=11b 0.25 0.35 0.45 a vout ocl current change voltage threshold v ocl vout falling - - 2.4 v vout discharge resistance r dchg 6 9 12 k vout 11.4 dc characteristics outside load switch driver table 11 . 4 dc characteristics outside load switch driver ( unless otherwise specified, sw_det = 5v, pgnd = 0v , ta = 25 c ) characteristics symbol test condition min typ. max unit terminal sw_det leakage current i det v out = 0v 250 - 500 a sw_det sw_uvlo detection voltage v su vl o_on sw_det = 5v to 0v 3.8 - - v sw_det sw_uvlo release voltage v su vl o_off sw_det = 0v to 5v - - 4.4 v sw_det sw_ovp detection voltage v sovp_on sw_det = 5v to 6v - - 5.9 v sw_det sw_ovp release voltage v sov p_off sw_det = 6v to 5v 5.55 - - v sw_det sw_en sink current 1 i swen1 sw_det = 5v - - 6.5 a sw_en sw_en output voltage high level 1 v oh_s wen 1 sw_det = 10v , vout = 0v i out = 0.1ma 9.5 - 10 v sw_en high level 2 v oh_s wen 2 sw_det = 0v , vout = 5v i out = 0.1ma 4.5 - 5 v low level v ol_swen sw_det = 5v , i out = - 1ma - - 0.4 v vout terminal leakage current i leak_vout - - 200 a vout
t c7761 wbg 2014- 05- 15 27 12. application circuit figure 12. 1 application circuit com1 clmp1 clmp2 com2 ac2 ac1 ac adaptor TC7761WBG stat sda scl xen 5v output rx coil vout sw_en sw_det pvdd pgnd 10f 2 vpp vdd45 1.0f fod vthd control
t c7761 wbg 2014- 05- 15 28 13. package dimensions s - xflga28 - 0304 - 0.50 - 001 weight: 1 0 mg (typ. ) note 1: unit: mm note 2: outer size: after simulation
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