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tc7763 wbg 2014- 0 5 - 09 1 toshiba c d mos integrated silicon monolithic circuit tc7763 wbg qi compliant wireless power receiver controller ic 1. outline the tc7763 wbg is wireless power receiver (r x ) ic compliant to the qi low power v1.1 standard of the wireless power consortium (wpc). the tc7763 wbg 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 to detect and select an external power supply . a digital control circuit realizes little heat generation and guarantees voltage stabilization during 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 communication devices (smartphone , featurephone, tablet), b attery pack, m obile accessory etc. 3. featu res ? full bridge rectifier circuit auto switch for 3 modes : synchronous 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 output 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 selector ? 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 tem perature and relative humidity are maintained at reasonable levels.
tc7763 wbg 2014- 0 5 - 09 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
tc7763 wbg 2014- 0 5 - 09 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 ball assignment (top view) index a g 1 4
tc7763 wbg 2014- 0 5 - 09 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. c onnect to gnd when not use d. g 1 fod i offset terminal for r x loss adjustments. loss offset terminal for fod connect appropriate 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 not used for temperature variation compensation.
tc7763 wbg 2014- 0 5 - 09 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
tc7763 wbg 2014- 0 5 - 09 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
tc7763 wbg 2014- 0 5 - 09 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
tc7763 wbg 2014- 0 5 - 09 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
tc7763 wbg 2014- 0 5 - 09 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. power is transmitted by adjoining coils included in the tx and rx and by sharing and combining their electromagnetic flux. the rx controls the transferred power by monitoring the receiv ed power and sending feedback signal s to the tx . the tx controls the power by controlling its transmitt ed power according to the feedback signal which is received from the rx . a c onfiguration example of a wireless power system is shown in figure 8.1 . communication signal s from rx to tx are transmitted (modulated) by ask modulation. the communication rate and its packet s are defined by the qi standard . communication rate is 2kbps. packets are id, identification signal , error information, receive power, and stop signal. the tx is powered on intermittently and confirms the existence of a rx on the tx pad. when the tx recognizes a rx it succeeds to the identification phase; transmit operation starts after a compliant rx has been identified . the tx continues the transmit operation until it cannot recognize the existence of a rx or receives a transmit stop signal from the rx . figure 8 . 1 general outline of a w ireless power system 8.2 general outline of wireless power r x system the tc7763 wbg includes a rectifier circuit which smoothes the r x coil current of the wireless power system ; a digital control circuit ; a modulation circuit which commun icates between rx and tx ; a regulator circuit which controls the load supply voltage ; and a load switch control circuit which switches between wired and wireless supply input s . a wireless power system can be constructed easily without the control of a mcu because the tc7763 wbg includes a digital control circuit which can operate in standalone mode. the digital control circuit corresponds to the wpc v1.1 standard and transmits the received power information to the tx after some calculations. by using the tc7763 wbg as rx , the tx can take advantage of the received power information sent by the rx and a wireless power system can be constructed including fod detection. a c onfiguration example of a rx system with wireless feeding and ac ad a pter connection inp ut is shown in figure 8.2 . in figure 8.2, the tc7763 wbg controls wireless feeding, is capable to detect a wired ac ad a pter, and selects the best input power as load supply. when a connection of an ac adopter is detected, the tc7763 wbg stops controlling wir eless feeding and starts the load supply through the load switch. the w ireless power system is controlled only when wired connection is not detected. removing the ac adopter or usb supply will re - start the wireless power transfer if the tx allows that. tx coil tx pad rx coil dc input dc output communication adjoin rx pad power
tc7763 wbg 2014- 0 5 - 09 10 figure 8 . 2 general outline of r x with the tc7763 wbg 8.3 control of tc7763 wbg 8.3.1 basic operation the tc7763 wbg incorporates a digital control circuit to realize communication with a tx . the tc7763 wbg starts qi compliant communication when it receive s power f r om a tx . a fter a certain period of t ime with pvdd being no t less than 7v during the power transfer phase, the ldo can be turned on . this is indicated by changing the stat signal to l. the ldo is enabled only when stat and xen are l . figure 8.3 shows a basic operation sequence using an external ly control led xen signal . figure 8 . 3 basic operation ( u sing xen control) - + ac adapter sw_det sw_en com1 ac1 ac2 com2 vout pvdd xen scl sda pgnd 5v output TC7763WBG rx coil outside load switch pvdd vout xen stat 5 v uvlo (n-ch open drain output) 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
tc7763 wbg 2014- 0 5 - 09 11 8.4 control state m achine the state machine of the tc7763 wbg consists of shutd o wn mode , disable mode , startup mode , output mode , and ovp mode. the w ireless power system starts operation when a qi compliant transmitters tx coil and the TC7763WBGs rx coil are adjoined . a wired power supply detected by the sw_en input will transfers the system to the disable mode . the state transition diagram of the wireless feeding control of the tc7763 wbg 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 tc7763 wbg 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 current normal current transmitting complete
tc7763 wbg 2014- 0 5 - 09 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 out detection of wired or wireless power supply. the detection judgment whether wireless power supply is on or not is done by internal monitoring of the pvdd terminal voltag e (vrect ; the voltage generated by rectifying the rf wireless power ). when the vrect is below the uvlo release voltage, tc7763 wbg enters shutdown mode . in shutdown mode , the rectifier circuit work as a diode bridge rectifier. then all mosfets are off and the diode bridge rectifies through the mosfet body diodes. the digi tal control circuit, communication circuit and regulator circuits are stopped. when the uvlo is released, tc7763 wbg starts to operate the wireless power supply control and goes to startup mode . 8.4.2 disable mode disable mode is the status when tc7763 wbg detects a wired power supply. the wireless power supply is stopped . when the tc7763 wbg detects a wired connection, the rect_clamp function becomes available to pr event accidentally providing wireless power. 8.4.3 startup mode startup mode is the status when the tc7763 wbg detects wireless power, in which it certificates with tx and s tabilize s vrect. the status has 5 phases which automatically transit in the following sequence : freq_det phase , ping phase , config&id phase , vrect_setup phase and standby phase . in the startup mode the rectifier circuit works as diode rectifier in which the low - side mosfet s are fixed to off and only the high - side mosfet s work. after the ldo is enabled , the syste m shifts to the output mode . (1) freq_det phase in the freq_det phase , tc7763 wbg determines if the tx is compliant to the qi standard . after uvlo is released, tc7763 wbg starts detection of the frequency on ac1 and ac2. when the range of the frequency is from 85 khz to 2 86 khz, tc7763 wbg considers that the frequency is stable. after confirming both the proper frequency and frequency stability, tc77 63 wbg shifts to the ping phase .
tc7763 wbg 2014- 0 5 - 09 13 (2) ping phase in the ping phase , tc7763 wbg notifies detection of wireless power supply to the tx . after 28 ms have elapsed in this phase, tc7763 wbg measure s vrec t to determine its received power and send s a packet including header (01h) and the result of the received power calculation . after that the tc7763 wbg automatically shifts to the config&id phase . (3) config&id phase in the config&id phase , tc7763 wbg sends rx information to the tx . after 7 .5 ms have elapsed in this phase, tc7763 wbg sends a packet including header (71h), wpc version, maker code and serial code. subsequently, after 7 .5 ms, it send s a packet includ ing header (51h), received power and timing code measured by the tc7763 wbg. then tc7763 wbg automatically shifts to vrect_setup phase . (4) vrect_setup phase in the vrect_setup phase , vrect is converged to its target value. after 7 .5 ms have elapsed in this phase, tc7763 wbg calculates an error value . after 1 ms tc7763 wbg sends a packet including header (03h) and control e rror packet (cep) including the error value . subsequently, after 40.5 ms, the tc7763 wgb calculates the received power and sends a packet including header (04h) and received power. in this mode the sending cycle of the error code is 62 ms. the sending cycl e of the received power is one ce per 29 sending cycles of the cep . if the vrect is over 7v and after cep are sent twice, TC7763WBG switches stat to l and moves to the standby ph ase. (5) standby phase standby phase is the status until the ldo works. when the ldo is stable , the tc7763 wbg shifts to the output mode . it is possible 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, tc7763 wbg shifts to the shutdown mode . 8.4.4 output mode in the output mode , tc7763 wbg provides power received from a wireless power supply to the load. the output mode has 2 sub - modes : the l do mode that provides 5v and the ocl mode that works with a 2 step constant current limit. if the output current exceeds 250 ma, the rectifier circ uit shifts to synchronous rectifier mode. if the output current is below 220 ma, the 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 . (1) ldo mode in the ldo mode , vrect C generated by a wireless power supply C passes through the built - in ldo and give s out a 5v constant voltage. the maximum current is set to 1.0a and ocl (over current limit) current (iocl) is set to 1.3a .
tc7763 wbg 2014- 0 5 - 09 14 (2) ocl mode 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 tc7763 wbg switches iocl according to vout. when vout exceeds 2.8v, iocl is set to 1.3a. when vout is below 2.5v, iocl is set to 0.35a. if vout is over 2.8v with iocl = 0.3 5 a, iocl is reconfigured to 1.3a. figure 8.5 shows the v - i characteristics . 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 automaticall y according to the output current. tc7763 wbg divides the status of its output current as shown below in table 8.2 . it is possible to reduce ic internal losses by reduc ing the difference between input and output voltage s at heavy load and reduc ing output voltage variations by controlling vrect at load cha nge s . 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 20ma less than 400ma 5.5 to 5.66v more than 400ma 5.1 to 5.25v 8.4.6 ovp mode this function is to avoid overvoltage of vrect by the over voltage detection function of vrect and the rect_clamp function. if vrect exceeds 15 v, tc7763 wbg judges it as an over voltage. in such a case the tc7763 wbg connects ac1 and ac2 to gnd through external capacitors by switching clmp1 and clmp2 from hi - z to gnd. the rx coil current flows through the capacitors, so that tc7763 wbg can reduce vrect. wpt_ovp function has a latching function that is reset through a uvlo condition. 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 tc7763 wbg activates any of its protection functions ( ovp, output 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 tc7763 wbg transmitted for a fixed period. then the tx stops power transmission automatically . iout vout 5 . 0 v 2 . 8 v 2 . 5 v 350 ma 1300 ma 0
tc7763 wbg 2014- 0 5 - 09 15 9. descriptions of functional details 9.1 communication 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 starts. 9.1.1 ask modulation c apacitors are connected between com1 and ac1 and between com2 and ac2. tc7763 wbg communicate with tx by ask modulation. t he coil current is overlapped with the signals that tc7763 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
tc7763 wbg 2014- 0 5 - 09 16 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 structure packets of wpc communication consist of four parts; preamble, header, message, and checksum. preamble: 11bit (default) of one continuously. header: i ndicates the kind of packet and specifie s the size of the me ssage that will be sent next. message: d ata of each packet type. checksum: xor value of header and message. checksum = header + message(0) + message(1) + + message (last) figure 9 . 4 packet format (wpc volume 1:low power, part 1 interface definition) t clk= 0.5 4% [ms]
tc7763 wbg 2014- 0 5 - 09 17 9.1.3 communication packets the tc7763 wbg transmits packet s according to the following definitions . ? p ing phase (1) signal strength packet (01 h) table 9 . 1 strength packet signal strength value : i t indicates the strength of the coupling between primary side and secondary side, which is calcu l ated by moni t or ing 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 : indicates m anufacture code. t he code of toshiba is 0033h . ext : fixed to ext= 0 basic device identification : 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)
tc7763 wbg 2014- 0 5 - 09 18 (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: indicates r eceived p ower 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
tc7763 wbg 2014- 0 5 - 09 19 (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 according to table 9. 6 . 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 due to xen= h or en_ldo= 0 at t ime out when ldo does n t work in standby p hase. internal fault 02h u nused over temperature 03h internal and e xternal o ver t emperature d etection 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 deviate s from the setting voltage range at constant time note 1 : tc7763 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
tc7763 wbg 2014- 0 5 - 09 20 9.2 rectifier circuit 9.2.1 rectifier modes the rectifier circuit has 3 modes: synchronous rectification, diode rectification, and diode bridge mode. TC7763WBG 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 over the mosfets body diode. in startup mode, the rectifier operates in the diode rectifier mode. in this mode, the low side mosfets ar e fixed to off. the rectifier operates by turning on and off only the high side mosfets. in output mode, when the output current exceeds 250ma, the rectifier circuit operates in the synchronous rectification mode by turning on and off all mosfets. in the synchronous rectification mode, when the output current decreases to 220ma or less, the rectifier circuit switches to 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 the rect_clamp function suppresses over voltage s of vrect. the clamping functions circuitry can be seen in f igure 9.5 . excessive coil current po tentially generating an over voltage at the internal recitfier output will be shunted to gnd through a capacitive load connected to the ics clmp terminals and the ic internal mosfets. this suppresses the excessive 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
tc7763 wbg 2014- 0 5 - 09 21 9.3 fod function the fod function is used to calculate losses of received power in the mobile device . tc 776 3 wbg can revise the actual received power , measured by the rectifier current, with an external resistor on the fod terminal. 9.4 thermal detection function external temperature is monitored by connecting a ntc thermistor to the vthd terminal. recommended thermistor is equivalent to the semitec503ft. figure 9 . 6 c onnection diagram of thermal detection circuit 9.5 external load switch control circuit an external l oad switch control circuit monitors the voltage of the sw_det terminal and selects the wireless power output or the usb input (or ac adopter ) by controlling an extern al load switch . when a secondary input power is connected to the sw_det terminal, below control is performed by the TC7763WBG . table 9 . 9 external load switch control c onditions of sw_det external load switch v oltage of sw_en clamp circuit ldo and 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
tc7763 wbg 2014- 0 5 - 09 22 9.6 protection functions 9.6.1 under voltage lockout (uvlo) function under voltage lockout (uvlo) function avoids errors caused by too low vrect voltages. uvlo detection condition is that the voltage of vrect falls below 3. 7 v (typ.). uvlo function is released when the voltage of vrect e xceeds 4.0v (typ.). the uvlo function stops the ldo output and sets the stat terminal outputs into hi - z state. 9.6.2 over voltage detection (wpt_ovp) function over voltage detection (wpt_ovp) function avoids errors caused by too high vrect voltages. detection condition of wpt_ovp function is that the voltage of pvdd exceeds 15v (typ.). the wpt_ovp function turns the output of the ldo off and activates the clamp circuit of the rectifier. when wpt_ovp is detected, the voltage of the pvdd terminal falls and wirele ss power operation stops because the output of internal detection signal is latched. wpt communication also stops. no message can be sent to the tx since the wireless power reception needs to be stopped as fast as possible to avoid damages of the receiver system. the tx will stop power transmission due to the missing control error packets. 9.6.3 over current detection (ocl) function over current detection (ocl) function avoidas excessive output current of the ldo. the detection condition of ocl function is that the current exceeds the output current determined by the voltage of vout (refer to the figure 8.5 ). in case the ocl detection time exceeds 4 ms (typ.) , power transmissi on is stopped by transmitting an ept message to the tx (0 5 h: over current). the ocl detection current is 1.3a (typ.). 9.6.4 thermal shutdown (tsd) function thermal shutdown (tsd) function avoids the ic destruction caused by rising chip 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 again. in case the tsd status continues for 200ms or more, the output of the ldo turns off and power transmission is finished by transmitting an ept message to the tx (03h: over temperature). 9.6.5 external over temperature protection (otp) function e xternal over temperature protection (otp) function avoids the ic destruction, which is caused by rising temperature, by monitoring the voltage over the external thermistor. the detection condition of otp function is that the voltage over the external therm istor exceeds the voltage configured in the set_ovtext register. in case the otp condition exceeds 1ms or more, the ldo output turns off and power transmission is finished by transmitting an ept message to the tx (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 the 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 the sw_det terminal rises to the voltage of sw_uvlo detection voltage or exceeds it, the wireless power output is turned off by selecting the external power input by turning on the external load switch. sw_ovlo function turns off the external load switch when the voltage of sw_det terminal is exceeds 5.75v (typ.). it does not switch to the wireless power even if it is available. 9.6.7 abnormality detection for ldo output function abnormality detection for ldo output function detects abnormal operation by monitoring the output voltage of abnormality detection of ldo output function detects abnormal operation by monitoring the output vol tage vout. when vout falls below 4.4v (typ.) for 3 .5 s or more, the ldo output turns off and power transmission is finished by transmitting an ept message to the tx (00h: unknown). when vout exceeds 5.6v (typ.) for 64ms or more, the ldo output turns off an d power transmission is finished by transmitting an ept message to the tx (0 6 h: battery failure).
tc7763 wbg 2014- 0 5 - 09 23 table 10. a bsolute maximum ratings (ta = 25 c) table 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. in addition, please assume it pgnd=0v . note 1: appl ies to pvd d terminal only note 2: appl ies to ac1, ac2, com1, com2, clmp1 and clmp2 terminals note 3: appl ies to sw_en and sw_det terminals note 4: appl ies to vpp terminal note 5: appl ies to terminal except above terminals
tc7763 wbg 2014- 0 5 - 09 24 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 2.5 - 15 v pvdd uvlo detection voltage v uvlo_on vrect = 7v to 0v 3.6 - 3.8 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
tc7763 wbg 2014- 0 5 - 09 25 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 1.1 1.3 1.5 a vout 5v ldo short current i ocl 2 vout = 0v 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 external load switch driver table 11 . 4 dc characteristics external 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
tc7763 wbg 2014- 0 5 - 09 26 12. application circuit figure 12. 1 application circuit com1 clmp1 clmp2 com2 ac2 ac1 ac adaptor TC7763WBG stat sda scl xen 5v output rx coil vout sw_en sw_det pvdd pgnd 10f 2 vpp vdd45 1.0f fod vthd control
tc7763 wbg 2014- 0 5 - 09 27 13. package dimensions s - xflga28 - 0304 - 0.50 - 001 weight: 1 0 mg (typ. ) note 1: unit: mm note 2: outer size: simulation results
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