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dual-channel power distribution switch tj2205 oct. 2011 ? r1.1 - 1 - htc features z 2.7v to 5.5v operating range z 500ma continuous current per channel z 1.25a maximum short circuit current limit z 90ua typical on-state supply current z 1ua maximum standby supply current z independent open-drain fault flag pins z thermal shutdown protection z 2.4v typical under voltage lockout(uvlo) z tj2205h : active high version z tj2205l : active low version z ul recognized. ul file no. e347996 application z usb peripherals z general purpose power switching z acpi power distribution z notebook pcs z pdas z hot plug-in power supplies sop8 pkg ordering information device package TJ2205HD sop8 tj2205ld description the tj2205x is dual-channel high-side mosfet sw itches optimized for general-purpose power distribution requiring circuit protection. the tj2205 series support the following usb requirements. each of the two channels supplies up to 500ma as required by usb downstream devices. each switch?s low on-resistance meets usb voltage drop requirements. fault current is limited to typicall y 1.2a. flag output indicates fault conditions to the local usb controller. soft-start prevents the transien t voltage drop on the upstream port that can occur when the switch is enabled in bus-powered applicati ons. under voltage lockout (uvlo) feature disables the output switches until a valid input voltage. also th e tj2205 include thermal shutdown to prevent switch failure from high-current loads. absolute maximum ratings (note 1) characteristic symbol min max unit supply voltage v in -0.3 6.0 v enable input voltage (note 2) v en -0.3 6.0 v fault flag voltage v flg - 6.0 v fault flag current i flag - 25 ma output voltage v out 6.0 v output current i out internally limited storage temperature range t stg -65 150
dual-channel power distribution switch tj2205 oct. 2011 ? r1.1 - 2 - htc operating ratings (note 3) characteristic symbol min max unit supply voltage v in 2.7 5.5 v ambient temperature range t a -40 85 operating junction temperature range t j -40 125 thermal resistance sop junction to ambient ja - 165 /w thermal resistance sop junction to case jc - 26 /w note: 1. exceeding the absolute maximum ratings may damage the device. 2. it is recommended for v en voltage not to exceed v in voltage. 3. the device is not guaranteed to f unction outside its operating rating. 4. devices are esd sensitive. handling precautions are recommended. ordering information 2205 tj package type root name product code : d : sop8 green mode g blank : halogen free : pb free enable mode h l : active C high : active C low
dual-channel power distribution switch tj2205 oct. 2011 ? r1.1 - 3 - htc typical application circuit en1 en2 flg1 flg2 out1 gnd out2 in vcc 2.7v to 5v 0.1uf 33uf d+ d- vbus gnd usb control usb ports tj2205 1 2 3 4 5 6 8 7 d+ d- vbus gnd 0.1uf 33uf 0.1uf vcont usb ports 10k 10k function block diagram current limit current limit gate control flag logic flag logic thermal shutdown uvlo bias gate control en1 en2 flg1 flg2 out1 out2 in gnd
dual-channel power distribution switch tj2205 oct. 2011 ? r1.1 - 4 - htc pin configuration pin description pin no. pin name pin description & function 1 en1 enable1: logic-compatible enables input. (h: active high, l: active low). do not float. 2 flg1 fault flag1: active-low, open-drain output. indicates short circuit, uvlo and thermal shutdown. 3 flg2 fault flag2: active-low, open-drain output. indicates short circuit, uvlo and thermal shutdown. 4 en2 enable2: logic-compatible enables input. (h: active high, l: active low). do not float. 5 out2 switch output2: output mosfet source . typically connect to switched side of load. 6 gnd ground 7 in supply input: output mosfet drain. also su pplies ic?s internal circuitry. connect to positive supply. 8 out1 switch output1: output mosfet source . typically connect to switched side of load.
dual-channel power distribution switch tj2205 oct. 2011 ? r1.1 - 5 - htc electrical characteristics (under the conditions of v in =+5v and t a =25 ) parameter symbol conditions min typ max units operating voltage range v in 2.7 5.5 v supply current i cc enable off ,out=open 0.05 1 ua enable on, out=open 90 160 ua enable input threshold voltage v en (note 5) 0.8 1.7 2.4 v enable input current i en v en = 0v to 5.5v -1 0.01 1 ua enable input capacitance c en 1 pf switch resistance r ds(on) v in =5v, i out =500ma 160 200 m ? v in =3.3v, i out =500ma 200 230 m ? output turn-on delay t don rl=10 ? each output, cl=1uf 50 us output turn-on rise time t r rl=10 ? each output, cl=1uf 40 us output turn-off delay t doff rl=10 ? each output, cl=1uf 0.5 10 us output turn-off fall time t f rl=10 ? each output, cl=1uf 0.5 10 us output leakage current i leak v enx 0.8v 0.01 5 ua current limit threshold i lim ramped load applied to output 1.0 1.2 1.4 a short circuit current limit i os each output, vout=0v 0.7 1.0 1.25 a over-temperature shutdown threshold t ts temperature increasing switch 145 o c temperature decreasing switch 135 o c error flag output resistance r fo v in =5v, i l =10ma 10 25 ? v in =3.3v, i l =10ma 15 40 ? error flag off current i foh v flag =5v 0.01 10 ua uvlo threshold uvlo v in = increasing 2.3 2.5 2.7 v v in = decreasing 2.1 2.3 2.5 v overcurrent flag response delay t dfov v in =5v, apply v out =0v until flg low 0.45 ms note: 5. off is ven 0.8v and on is ven 2.4v for the tj2205h. off is ven 2.4v and on is ven 0.8v for the tj2205l.
dual-channel power distribution switch tj2205 oct. 2011 ? r1.1 - 6 - htc test circuit
dual-channel power distribution switch tj2205 oct. 2011 ? r1.1 - 7 - htc typical performance characteristics on-resistance vs. temperature on-resistance vs. supply voltage on-current vs. temperature on-current vs. supply voltage enable threshold vs. temperature enable threshold vs. supply voltage
dual-channel power distribution switch tj2205 oct. 2011 ? r1.1 - 8 - htc typical performance characteristics (continued) turn-on delay time vs. temperature turn-on delay time vs. supply voltage turn-on rise time vs. temperature turn-on rise time vs. supply voltage turn-off fall time vs. temperature turn-off fall time vs. supply voltage
dual-channel power distribution switch tj2205 oct. 2011 ? r1.1 - 9 - htc typical performance characteristics (continued) current limit threshold vs. temperature current limit threshold vs. supply voltage short circuit current vs. temperature uvlo vs. temperature
dual-channel power distribution switch tj2205 oct. 2011 ? r1.1 - 10 - htc typical operating characteristics - vin=5v, c1=1uf, ven=vin, ta=25 o c, unless otherwise noted turn ? on / turn-off turn ? on turn ? off inrush current response enable into short (tj2205h) thermal shutdown
dual-channel power distribution switch tj2205 oct. 2011 ? r1.1 - 11 - htc typical operating characteristics (continued) uvlo ? vin rising uvlo ? vin falling
dual-channel power distribution switch tj2205 oct. 2011 ? r1.1 - 12 - htc function description supply filtering a 0.1uf to 1uf bypass capacitor from in pin to gnd pin is recommended to control power supply transients. without this bypass capa citor, an output short can cause ringi ng from supply lead inductance on the input and damage the internal control circuitry. input or output transients must never exceed t he absolute maximum supply voltage (vinmax = 6v) power dissipation the device?s junction temperature depends on several factors such as the load, pcb layout, ambient temperature, and package type. e quations that can be used to calc ulate power dissipation of each channel and junction temperature are found below: p d =r ds(on) x i out 2 total power dissipation of the device will be the summation of p d for both channels. to relate this to junction temperature, the following equation can be used: t j =p d x ja +t a where: t j = junction temperature t a = ambient temperature ja = thermal resistance of the package enable/shutdown the en1 and en2 control pins must be driven to a logic high or logic low for a clearly defined signal input. floating these control lines may cause unpredictable operation. fault flag the flg signal is open-drained output of n-channel mosfet, the flg output is pulled low to signal the following fault conditions: input under voltage, output to gnd short, and thermal shutdown. soft-start condition the tj2205 has high impedance when off, which gradually shifts to low impedance as the chip turns on. this prevents an inrush current from causing voltage drops that result from charging a capacitive load and can pull the usb voltage bus below specified levels. this satisfies the usb voltage droop requirements for bus-powered applications. the tj2205 can provide inrush current limiting for app lications with large load capacitances where c l >10uf. current sense a sense mosfet monitors the current supplied to t he load. the sense mosfet measures current more efficiently than conventional resist ance methods. when an overload or short circuit is encountered, the current-sense circuitry sends a control signal to the driver. the driver in turn reduces the gate-source voltage and drives the power mosfet into its satu ration region, which switches the output into a constant-current mode and holds the current cons tant while varying the voltage on the load. over-current and short-circuit protection the tj2205 features an over-current protection circuitry to protect the device against overload conditions. the current limit threshold is preset internally. it protects the output mosfet switches from damage due to undesirable short circuit conditions of excess in rush current often encountered during hot plug-in. the low limit of the current limit threshold of the tj 2205 allows a minimum current of 0.5a through the
dual-channel power distribution switch tj2205 oct. 2011 ? r1.1 - 13 - htc mosfet switches. a current limit cond ition will signal the error flag. t hese features can protect the load system effectively at any accidental circumstances. thermal shutdown protection thermal shutdown limits the tj2205 junction temper ature and protects the device from damage as a result of overheated. thermal protection turns off when the tj2205?s junction temperature 145 reached, allowing it to cool down until 135 . the tj2205 is reactivated when a junction temperature drops to approximately 130 . it depends on the power dissipation, therma l resistance, and ambient temperature. under voltage lockout under voltage lockout (uvlo) prevents the output mosfet from turning on until v in exceeds approximately 2.5v. after the switch turns on, if the voltage drops below 2.3v typically, uvlo shuts off the output mosfet. under voltage detection functions only when the switch is enabled. printed circuit layout the power circuitry of usb printed circuit boards requires a customized layout to maximize thermal dissipation and to minimize voltage drop and emi. usb compliance the tj2205 is ideal for self-powered and bus power ed universal serial bus (usb) applications. a usb port provides a +5.0v bus and ground return line in addition to a twisted pair for data. the tj2205 will comply with the following usb requirements: 1) the fault current is well below the ul 25va safety requirements. 2) the flag outputs are available to indicate fault conditions to usb controllers. 3) the mosfet switches' low on-resistance meets usb voltage drop requirements. 4) each mosfet switch channel can supply 500ma as required by usb downstream devices. 5) soft start eliminates any momentary voltage drop s on the upstream port t hat may occur when the switches are enabled in bus-powered applications. 6) an under-voltage lockout ensures that the device remains off unless there is a valid input supply voltage present. 7) +2.7v and +5.0v logic compatible enable inputs. 8) thermal shutdown prevents the possibility of ca tastrophic switch failure from high-current loads. 8) the device is available in both active-high and active-low versions. table 1. usb protocol compliance of the tj2205 device usb requirement tj2205 compliant feature inrush current limiting required soft start turns on in 1ms suspend state of <500ua required suspend current of 1ua maximum bus powered hubs must have 350mv drop from cable plug to port. switch on resistance of 200m ? maximum (translates to 100mv at 500ma) voltage supplied to host or hub port is +4.75v to +5.25v operating range of +2.7v to +5.5v a device that draws bus power must have a stable supply within 100ms of vbus reaching +4.4v turn on in 1ms over-current reporting capability required open drain fault flags.

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